22 - 26 September 2013
ICC London ExCeL, UK

Wednesday 25 September

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We.1.A • 09:00 - 10:30
Chair: Magnus Karlsson, Chalmers University of Technology (CTH), Sweden


We.1.A.1 • 09:00
Fiber Raman Amplification for Metrological Transfer of Phase-coherent Optical Frequencies
G Bolognini1, C Clivati2,3, D Calonico2, S Faralli4, F Levi2, A Mura2, N Poli5; 1Consiglio Nazionale delle Ricerche, IMM Institute, Italy; 2Istituto Nazionale di Ricerca Metrologica INRIM, Italy; 3Politecnico di Torino, Italy; 4Scuola Superiore Sant'Anna, TeCIP Institute, Italy; 5 Dip. Fiscia e Astronomia INFN and LENS, Università di Firenze, Italy
We analyze the benefits of distributed Raman amplification in metrology transfer of phase-coherent ultra-narrowband optical frequencies in a long fiber link (200 km with additional 16 dB loss), providing high-gain bi-directional amplification with limited impact on phase noise, attaining a fractional frequency instability of 3×10−19 over 1000 s.

We.1.A.2 • 09:15
Fast and Broadband Fiber Dispersion Measurement with Dense Wavelength Sampling
G M Ponzo1, M Petrovich1, X Feng1, P N Horak1, F Poletti1, P Petropoulos1, D J Richardson1; 1Optoelectronics Research Centre, University of Southampton, UK
We report on a method to obtain accurate dispersion measurements from low-coherence interferograms. This novel phase extraction method enables high accuracy, broadband measurements and very dense (20points/nm over 500nm) datasets for both dispersion and dispersion slope.

We.1.A.3 • 09:30
Fast Polarimetry of Multipulse Vector Soliton Operation
V Tsatourian1,2,3, S V Sergeyev1, C Mou1, A Rozhin1, V Mikhailov4,  B Rabin4;  P S Westbrook4, S Turitsyn1, 1Aston Institute of Photonic Technologies, Aston University, UK; 2School of Engineering and Physical Sciences, Heriot-Watt University, UK; 3OFS Fitel, USA
Applying high-speed polarimetery we experimentally demonstrate new types of vector solitons for multipulse operation in an erbium doped carbon nanotube mode-locked laser. The observed states of polarisation reveal either fast pulse-to-pulse polarisation switching between cross-polarised modes or slow cyclic evolution.

We.1.A.4 • 09:45
Environmental Perturbation Tracking in Coherent OTDR for Recovering Detection Sensitivity
H Iida1, K Toge1, F Ito1; 1NTT Access Network Service Systems Laboratories, NTT Corporation, Japan
The effect of environmental perturbations applied to long-haul submarine cables on the C-OTDR performance is demonstrated. Perturbation-tracking compensation experiment based on software processing reveals that we can compensate for SNR degradation caused by a Doppler frequency shift in backscattering.


We.1.B • 09:00 - 10:30
Modulators I
Chair: Liam Barry, DCU, Ireland


We.1.B.1 • 09:00 Invited
Optical Modulators for Advanced Digital Coherent Transmission Systems
H Yamazaki1, T Goh1, T Saida1; 1NTT Photonics Laboratories, Japan
Advanced optical modulators for future digital coherent transmission systems are being explored. In this paper, a dual-carrier modulator for 400-Gbps transmission, a linear IQ modulator suitable for a DAC-based transmitter, and a simple PS-QPSK modulator are reviewed.


We.1.B.2 • 09:30
Very-Low-Voltage Operation of Mach-Zehnder Interferometer-Type Electroabsorption Modulator
Y Ueda1, T Fujisawa1, S Kanazawa1, W Kobayashi1, K Takahata1, H Ishii1; 1NTT Photonics Laboratories, NTT Corporation, Japan
We have developed a new interferometer-type electroabsorption modulator. It operates at a very-low voltage of 0.2 V at 25.8-Gbit/s modulation, which can reduce optical transmitter power consumption and allows the adoption of cost-effective CMOS drivers.

We.1.B.3 • 09:45
Performance Improvement of Silicon Micro-Cavity Modulators by Iteration of the p-i-n Intrinsic Region Width
A Al-Saadi1, B A Franke1, S Kupijai1, C Theiss1, H Rhee1, S Mahdi1, L Zimmermann2, D Stolarek2, H H Richter2, H J Eichler1, U Woggon1, S Meister1; 1Technische Universität Berlin, Institut für Optik und Atomare Physik, Germany; 2IHP Microelectronics, Germany
The distance between the p+- and n+-doped regions of the p-i-n diode in micro-cavity modulators represents a compromise between speed and loss. We varied the intrinsic region width to determine the influence on the modulator properties through simulations and experiments. A width of 0.7 µm was found to be the optimal value for modulation operation.

We.1.B.4 • 10:00
Generation of Dual-Carrier QPSK Signals with Mixed Electronics-Optics Modulator
K Kikuchi1, T Saida1, H Nosaka1, H Yamazaki1, M Nagatani1, T Goh1, K Kurishima1, K Murata1; 1NTT Photonics Labratories, NTT Corporation, Japan
We devised a dual-carrier QPSK modulator that uses both analogue electrical and optical modulation, which simplifies the optical circuit configuration and reduces the power consumption of a transmitter. We demonstrated the generation of dual-carrier 14-Gbaud QPSK signals with the devised modulator.

We.1.B.5 • 10:15 
High-Speed Direct-Modulation of InP Microdisk Lasers
J Hofrichter1, O Raz2, S Keyvaninia3, T de Vries2, H J S Dorren2, T Morf1, B J Offrein1; 1IBM Research - Zurich, Switzerland; 2Eindhoven University of Technology, Netherlands; 3Photonics Research Group, Gent University/IMEC, Belgium
We demonstrate for the first time high-speed direct-modulation of InP microdisk lasers by exploiting longitudinal mode competition. High-speed operation is demonstrated by means of S21 and PRBS modulation. We show open eye diagrams and bit-error rates up to 10 Gb/s.


We.1.C • 09:00 - 10:30
Spectrally Shaped Transmission Subsystems
Chair: Andrew Ellis, Aston University, UK


We.1.C.1 • 09:00
Transmission of a 1.1 Tb/s Super Channel in 100 GHz Optical Bandwidth Based on PM-256 QAM and Spatially Coupled FEC
R Dischler1, L Schmalen1; 1Alcatel-Lucent Bell Labs, Germany
We demonstrate generation and transmission of PM-256 QAM signals at a symbol rate of 14.1 GBd in a 20-GHz channel grid WDM scheme as a 1.1 Tb/s super channel. Application of spatially coupled LDPC coding with iterative demodulation reduces the required FEC overhead down to 21 % compared to non-iterative schemes.

We.1.C.2 • 09:15
Three-carrier 1 Tbit/s Dual Polarization 16-QAM Superchannel Using Look-Up Table Correction and Optical Pulse Shaping
J H Ke1, Y Gao1, J C Cartledge1; 1Dept. of Electrical and Computer Engineering, Queen's University, Canada
By using look-up table correction for pattern-dependent distortion and optical pulse shaping for enhancing the spectral efficiency, a three-carrier 1.206 Tbit/s dual-polarization 16-QAM superchannel exhibits a back-to-back OSNR sensitivity of 25.9 dB (BER = 10-3), a net spectral efficiency of 4.47 b/s/Hz, and transmission over 1500 km of SMF.

We.1.C.3 • 09:30
Experimental Comparison of 32-Gbaud Electrical-OFDM and Nyquist-WDM Transmission with 64GSa/s DAC
Y Lu1, Y Fang1, B Wu1, K Wang1, W Wan1, F Yu1, L Li1, X Shi1, Q Xiong1; 1Huawei Technologies Co. Ltd., Transmission Technology Research Dept., China
The transmission performances of Electrical-OFDM and Nyquist-WDM systems using 32GBaud PDM-QPSK and PDM-16QAM modulations generated by a 64GSa/s DAC, were compared experimentally for the first time. The results show that both of the Nyquist-WDM and OFDM systems achieve same transmission distance and have similar nonlinear transmission performance.

We.1.C.4 • 09:45
Detection of 320 Gb/s Nyquist OTDM Received by Polarization-insensitive Time-domain Optical Fourier Transformation
H Hu1, D Kong1,2, E Palushani1, M Galili1, H C Mulvad1, L K Oxenløwe1; 1DTU Fotonik, Dept. of Photonics Engineering, Technical University of Denmark, Denmark; 2State Key Laboratory of Information Photonics & Optical Communications, Beijing University of Posts and Telecommunications, China
320 Gb/s Nyquist-OTDM is generated by rectangular filtering with a bandwidth of 320 GHz and received by polarization-insensitive time-domain optical Fourier transformation (TD-OFT) followed by passive filtering. After the time-to-frequency mapping in the TD-OFT, the Nyquist-OTDM is converted into a waveform similar to an OFDM signal.

We.1.C.5 • 10:00
Seamless Spectral Defragmentation of Nyquist OTDM-WDM Signals in Add-Drop Node for All-Optical Elastic Network
H N Tan1, K Tanizawa1, T Inoue1, T Kurosu1, S Namiki1; 1National Institute of Advanced Industrial Science and Technology (AIST), Japan
We demonstrate a seamless frequency translation of Nyquist OTDM-WDM signals using a dual-stage polarization-diversity FWM-based wavelength converter for all-optical elastic network. A 172-Gbaud Nyquist OTDM signal is elastically frequency-shifted at an add-drop node and successfully transmitted over 80-km fiber link.

We.1.C.6 • 10:15
Precise Remote Optical Carrier Addition Into 200-Gb/s CO-OFDM Channel Using Fiber Frequency Conversion
T Kato1, R Okabe1, T Richter2, R Elschner2, C Schmidt-Langhorst2, C Schubert2, S Watanabe1; 1Fujitsu Labotratories Ltd., Japan; 2Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute, Germany
We propose a locally defined precise subcarrier addition into an orthogonal frequency-division multiplexed signal using fiber-frequency conversion. A 12.5-GBd QPSK-signal is added into an exact frequency grid to generate 200-Gb/s CO-OFDM at a free-running remote node without additional OSNR penalty.


We.1.D • 09:30 - 11:00
Beyond WDM
Chair: Fabrizio Forghieri, Cisco Photonics, Italy


We.1.D.1 • 09:30 Tutorial  
Spatial Multiplexing: The Next Frontier in Network Capacity Scaling
P J Winzer1; 1Bell Labs, Alcatel-Lucent, USA
We outline a smooth evolution path of optical networks to spatial multiplexing by complementing deployed fiber infrastructure and existing WDM components with new integrated technologies



We.1.E •09:00 - 10:30
Elastic Optical Networking
Chair: Naoya Wada, National Institute of Information and Communication Technology, Japan


We.1.E.1 • 09:00 Invited
Evolution of Traffic Grooming from SDH/SONET to Flexible Grid
S Zhang1, M Tornatore2, G Shen3, B Mukherjee1; 1University of California, Davis, USA; 2Politecnico di Milano, Italy; 3Soochow University, China
We review the evolution of traffic grooming from SDH/SONET to evolutionary flexible-grid and elastic-rate technologies and summarize the relevant issues. Sliceable optical transponder is identified as a novel technology that could potentially impact the future grooming paradigm.


We.1.E.2 • 09:30
Moving Boundary between Wavelength Resources in Optical Packet and Circuit Integrated Ring Network
H Furukawa1, T Miyazawa1, N Wada1, H Harai1; 1National Institute of Information and Communications Technology, Japan
We present an optical packet and circuit integrated ring network which can move a boundary between wavelength resources of optical packets and paths for flexible resource usage. Using a hybrid optical packet/circuit switch and transponder, an optical packet link is automatically changed to optical path links on one waveband.

We.1.E.3 • 09:45
Impact of Multi-flow Transponder on Equipment Requirements in IP over Elastic Optical Networks
T Tanaka1, A Hirano1, M Jinno2; 1NTT Network Innovation Laboratories, NTT Corporation, Japan; 2Kagawa University, Japan
We evaluate the elastic optical network performance from the network to node component level using a multi-layer network design scheme. Results show that the multi-flow optical transponderbased network model reduces equipment requirements such as router interfaces and wavelength selective switch parameters.

We.1.E.4 • 10:00
OpenFlow-Controlled Elastic Optical Networks with Direct-Detection Optical OFDM (DDO-OFDM) Transmission
L Liu1, W-R Peng2, R Casellas3, T Tsuritani2, I Morita2, R Martínez3, R MUÑOZ3, S J Ben Yoo1; 1University of California, Davis, USA; 2KDDI R&D Laboratories Inc., Japan; 3Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Spain
We design and deploy an extended OpenFlow-based control plane for elastic optical networks with DDO-OFDM transmission, detailing the network architecture, the two-phase routing and spectrum assignment algorithm, OpenFlow protocol extensions and the experimental validation.

We.1.E.5 • 10:15
Experimental Validation of an Elastic Low-Complex OFDM-Based BVT for Flexi-Grid Metro Networks
M S Moreolo1, J M Fabrega1, F J Vílchez1, L Nadal1, V López2, G Junyent1; 1Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Spain; 2Telefonica I+D, Spain
Cost-effective rate/bandwidth variable transponder (BVT) based on DSB DD-OFDM using low-complexity DSP is proposed for flexi-grid MAN. Elastic capabilities are experimentally evaluated, for transmitting 12.5GHz channels at variable rate between 5Gb/s and 10Gb/s along optical path from 45km to 195km.


We.1.F • 09:00 - 10:30
Flexible Access
Chair: Naoto Yoshimoto, NTT, Japan


We.1.F.1 • 09:00 Invited
Access Networks Based on Tunable Transmitters
K Grobe1; 1ADVA Optical Networking SE, Germany
State-of-the-art, prospects and problems of access based on tunable lasers are discussed. Potential advantages over competing approaches (seeded reflective transmitters) include higher bit-rate x reach products. Main problem is the lack of availability of low-cost tunables. Here, protection of other tunable-laser markets is required.


We.1.F.2 • 09:30
Flexible TDMA Access Optical Networks Enabled by Burst-mode Software Defined Coherent Transponders
F Vacondio1, O Bertran-Pardo1, Y Pointurier1, J Fickers1, A Ghazisaeidi1, G de Valicourt1, J C Antona1, P Chanclou2, S Bigo1; 1Alcatel-Lucent Bell Labs, France; 2Orange Labs, France
We propose a concept of flexible PON and show with experiments and network dimensioning how burst-mode, software-defined coherent transponders can more than double the average capacity per user in TDMA access networks.

We.1.F.3 • 09:45
Low Complexity Transmitter-side Compensation for Optical Device Nonlinearities in 100Gb/s Transmission over 500m SMF
B Liu1, Yan1, Li1, Chen1, Tao1, T Takahara2, J C Rasmussen2, T Drenski3; 1Fujitsu R&D Center, China; 2Fujitsu Laboratories Ltd, Japan; 3Fujitsu Semiconductor Europe GmbH, Germany
The device nonlinearity by laser diode and photo detector is identified as one of the major distortions in a 100Gb/s-class transmission over 500m SMF using discrete multi-tone technology. A novel transmitter-side DSP algorithm is proposed and 20% capacity improvement is achieved by a simple structure without usage of any feedback iterations.

We.1.F.4 • 10:00
Cost-effective Broadband GaAs IQ Modulator Array for Long-Reach OFDM-PONs
L Stampoulidis1, E Giacoumidis2, M F O'Keefe3, I Aldaya4, R G Walker3, Y Zhou3, N Cameron3, E Kehayas1, A Tsokanos5, I Tomkos6, N J Doran2, L Zimmermann7; 1Constelex Technology Enablers Ltd, Greece; 2Aston Institute of Photonic Technologies (AIPT), Aston University, UK; 3u2t Photonics UK Ltd, UK; 4Tecnológico de Monterrey, Mexico; 5Plymouth University, UK; 6Athens Information Technology, Greece; 7IHP Microelectronics, Germany
A novel modulator array integrating eight GaAs electro-optic IQ modulators is characterized and tested over long-reach direct-detected multi-band OFDM-PONs. The GaAs IQ modulators present > 22 GHz bandwidth with 3V Vpi, being suitable for a 100-km 40-Gb/s OOFDM-PON supporting up to 1024 users.

We.1.F.5 • 10:15
Amplified RSOA Self-Tuning Laser for WDM PON Using Saturated SOA for Noise Reduction and Data Cancellation
Q Deniel1,2, F Saliou1, S D Le1, P Chanclou1, D Erasme2, R Brenot3; 1Orange Labs, France; 2Telecom ParisTech, France; 3III-V Labs, France
We evaluated different km-long WDM PON laser sources based on amplified self-tuning solution. RIN reduction and data cancellation is demonstrated by using saturated SOA inside the cavity. The BER performance at 2.5Gb/s was enhanced with up to 50km cavity length.


We.2.A • 11:00 - 12:30
Nonlinearity in fibres
Chair: Dag Hjelme, HiST, Norway


We.2.A.1 • 11:00 Invited

Χ³ Processes in High Numerical Optical Fibers and Fiber Tapers
T Lee1, M I M Abdul Khudus1, R Ismaeel1, C A Codemard2, N G R Broderick3, G Brambilla1; 1 Optoelectronics Research Centre, University of Southampton, UK; 2 Advanced Laser Laboratory, SPI Labs, Optoelectronics Research Centre, University of Southampton, UK 3Department of Physics, University of Auckland, New Zealand;
Intermodally phase matched up- and down-conversion processes based on the third order nonlinearity can be used to efficiently generate UV and mid-IR wavelength regions in solid core silica optical fibers and optical fiber tapers


We.2.A.2 • 11:30
High-Peak-Power Femtosecond Pulse Generation using Graphene as Saturated Absorber and Dispersion Compensator
L Yi1, Z Li1, R Zheng1, Z Ni2, H Nan2, Z Liang3, R Ding3, W Hu1; 1The State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, China; 2Department of Physics, Southeast University, China; 3Graphene Research and Characterize Center, Taizhou Sunano New Energy Corporation, China
We demonstrate a passively mode-locked Erbium-doped fibre laser by using CVD fabricated graphene as both saturated absorber and dispersion compensator to achieve a 12-nJ energy pulse with 303-fs width, resulting in a 40-kW peak power, which is the highest value for graphene-based Erbium-doped passively mode-locked all-fibre laser.

We.2.A.3 • 11:45
Narrow Linewidth Brillouin Laser based on Chalcogenide Chip
I V Kabakova1,2, R Pant1,2, D-Y Choi2,3, S Debbarma2,3, S J Madden2,3, B Luther-Davies2,3, B J Eggleton1,2; 1Institute of Photonics and Optical Sciences (IPOS), School of Physics, University of Sydney, Australia; 2Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS),University of Sydney, Australia; 3 Laser Physics Centre, Australian National University, Australia
We demonstrate a narrow-linewidth Brillouin laser based on chalcogenide photonic chip. We show that the laser linewidth is 15 times smaller compared to the pump. This is due to the optical feedback and acoustic damping of the pump noise.

We.2.A.4 • 12:00
Wavelength Conversion of Optical 64QAM and its Performance Optimization by Constellation Monitoring
G-W Lu1, T Sakamoto1, T Kawanishi1; 1NICT, Japan
We experimentally demonstrate for the first time to our best knowledge, the wavelength conversion of 64QAM through four-wave mixing in highly-nonlinear fiber. In order to eliminate the extra nonlinear distortions such as SPM and SBS, it is suggested to optimize the operation condition by monitoring the constellations, rather than BER.


We.2.B • 11:00 - 12:30
Modulators and Detectors
Chair: Joe Campbell, University of Illinois, USA


We.2.B.1 • 11:00 Invited
Monolithic Silicon Photonic Circuits Enable 112-Gb/s PDM-QPSK Transmission over 2560-km SSMF
P Dong1, X Liu1, S Chandrasekhar1, L L Buhl1, R Aroca1, Y Baeyens1, Y-K Chen1; 1Bell Labs, Alcatel-Lucent, USA
Using silicon photonic integrated circuits (PICs), we demonstrate the generation, transmission over 2560-km standard single-mode fiber, and detection of 112-Gb/s polarization-division-multiplexed quadrature phase-shift keying signals. These silicon-based PICs promise compact, low-power-consumption, and low-cost coherent transceivers.


We.2.B.2 • 11:30
A Compact Silicon-on-Insulator Optical Hybrid for Low Loss Integration with Balanced Photodetectors
M S Hai1, M N Sakib1, O Liboiron-Ladouceur1; 1Dept. of Electrial and Computer Engineering, McGill University, Canada
An optical hybrid design based on paired multimode interference couplers in silicon-on-insulator process is investigated. The device exhibits greater than 20 dB CMRR and low phase deviation (<10) over 30 nm in the C-band. The design eliminates the use of optical cross waveguides for integration with balanced photodetectors.

We.2.B.3 • 11:45
Compact 100Gb/s DP-QPSK Integrated Receiver Module Employing Three-dimensional Assembly Technology
H Tanobe1, Y Kurata1, Y Nakanishi1, H Fukuyama1, M Itoh1, E Yoshida1; 1NTT Photonics Laboratories, NNT Corporation, Japan
We demonstrate a compact 100 Gbit/s DP-QPSK receiver module as small as 18 mm (W) x 16 mm (D) x 2.8 mm (H). The module size is reduced by using a ball grid array (BGA) package with three-dimensional assembly technology and applying a heterogeneous integrated PLC. Error-free DP-QPSK signal demodulation is successfully demonstrated.

We.2.B.4 • 12:00
25-Gbit/s Burst-mode Optical Receiver using High-speed Avalanche Photodiode for 100-Gbit/s Optical Packet Switching
M Nada1, M Nakamura2, H Matsuzaki1; 1NTT Photonics Laboratories, Japan; 2Dept. of Electrical, Electronic and Computer Engineering, Gifu University, Japan
25-Gbit/s error-free operation of an optical receiver is demonstrated against burst signal without preambles. The receiver with a high-sensitivity avalanche photodiode and burst-mode transimpedance amplifier successfully exhibits sufficient receiver sensitivity and a short rise time for burstmode operation in 100-Gbit/s optical packet switching.

We.2.B.5 • 12:15
A High-Power and High-Linearity Photodetector Module with 25 dBm RF Output Power at 10 GHz
E Rouvalis1, Q Zhou2, A Beling2, A S Cross2, A G Steffan1, J C Campbell2; 1u2t Photonics AG, Germany; 2University of Virginia, Dept. of ECE, USA
We have developed a packaged photodetector module with an RF output power of almost 25 dBm at 10 GHz and more than 23 dBm at 15 GHz. To the best of our knowledge, these are the highest RF power levels ever reported from fully packaged 1.55 µm photodetectors without electrical amplification.


We.2.C • 11:00 - 12:30
Coding & FEC
Chair: Werner Rosenkranz, Universität Keil, Germany


We.2.C.1 • 11:00 Tutorial
Status and Recent Advances on Forward Error Correction Technologies for Lightwave Systems
A Leven1, L Schmalen1; 1Bell Labs, Alcatel-Lucent, Germany
Since the introduction of coherent transponders, forward error correction based on soft decision is now established in optical communication. In this tutorial, we give a descriptive introduction of one class of commonly used codes, namely LDPC codes. Also we discuss new developments, e.g. convolutional LDPC codes.

We.2.C.2 • 12:00
Tomlinson-Harashima Precoding for Fiber-Optic Communication Systems
R Rath1, W Rosenkranz1; 1Christian-Albrechts-Universität zu Kiel, Germany
The performance of Tomlinson-Harashima precoding (THP) is investigated for a 12.5 GBaud 16QAM transmission. THP is shown to reduce significantly the computational load compared with linear equalization and to eliminate the error propagation phenomenon associated with decision-feedback equalization.

We.2.C.3 • 12:15
Hybrid Soft/Hard Decision Multilevel Coded Modulation for Beyond 100Gbps Optical Transmission
F Yu1, D Chang1, N Stojanovic2, C Xie2, M Li1, L Jin1, X Zhiyu1, X Shi1, L Li1; 1Huawei Technologies Co., Ltd., Network Research Department, China; 2Huawei Technologies Duesseldorf GmbH, European Research Center, Germany
We propose a hybrid soft/hard decision multilevel coded modulation scheme (HMLC) which improves the performance-complexity ratio compared with conventional single LDPC scheme. An iterative multi-stage decoding algorithm between LDPC and BCH codes is presented.


We.2.D • 11:00 - 12:30
Space-Division Multiplexing I
Chair: Peter Krummrich, Technische Universität Dortmund, Germany


We.2.D.1 • 11:00
708-km Combined WDM/SDM Transmission over Few-Mode Fiber Supporting 12 Spatial and Polarization Modes
R Ryf1, S Randel1, N K Fontaine1, X Palou1,2, E Burrows1, S Corteselli1, S Chandrasekhar1, A H Gnauck1, C Xie1, R-J Essiambre1, P J Winzer1, R Delbue3, P Pupalaikis3, A Sureka3, Y Sun4, L Grüner-Nielsen5, R J Jensen5, R Lingle Jnr4; 1Bell Laboratories, Alcatel-Lucent, USA; 2Universitat Politecnica de Catalunya (ETSETB), Spain; 3Teledyne LeCroy Corporation, USA; 4OFS, USA; 5OFS Fitel Denmark, Denmark
We transmit 16 WDM channels using 20-Gbd QPSK over 12 spatial and polarization modes of 708-km few-mode fiber at a spectral-efficiency-distance product of 11328 km bit/s/Hz.The transmitted signals are recovered using off-line 12 x 12 multiple-input multiple-output digital signal processing.

We.2.D.2 • 11:15
20 x 960 Gb/s MDM-DP-32QAM Transmission over 60km FMF with inline MM-EDFA
V A J M Sleiffer1,5, P Leoni2, Y Jung3, J Surof4, M Kuschnerov5, V Veljanovski5, D J Richardson3, S U Alam3, L Grüner-Nielsen6, Y Sun7, B Corbett8, R Winfield8, S Calabro5, B Sommerkorn-Krombholz5, H von Kirchbauer5, H De Waardt1; 1COBRA, University of Technology Eindhoven, Netherlands; 2Universität der Bundeswehr München, Germany; 3Optoelectronics Research Centre, University of Southampton, UK; 4Technische Universität München, Germany; 5Nokia Siemens Networks Optical GmbH, Germany; 6OFS, Denmark; 7OFS, USA; 8Tyndall National Institute, Uninversity College Cork, Ireland
We show transmission of 20 wavelength-division-multiplexed (WDM) x 3 mode-division-multiplexed (MDM) x 320-Gb/s DP-32QAM modulated channels (spectral efficiency (SE) of 15 bits/s/Hz) over 60km of few-mode fiber (FMF) with inline multi-mode EDFA (MM-EDFA).

We.2.D.3 • 11:30 Invited
Multi-core Fiber Transmission Technologies for Peta b/s per Fiber Capacity
H Takara1; 1NTT Network Innovation Laboratories, NTT Corporation, Japan
Recent development on transmission technologies based on multi-core space-division-multiplexing is described, enabling well over Peta bit/s per fiber link capacity.

We.2.D.4 • 12:00 
DWDM Transmission of 128Gb/s PM-16QAM Signal over 1815km of 7-core MCF Using Shared Carrier Reception for Improving the Received Signal Quality
E Le Taillandier de Gabory1, M Arikawa1, T Ito1, K Fukuchi1; 1Green Platform Research Laboratories, NEC Corporation, Japan
We demonstrate SCR method with 1815km transmission of 128Gb/s PM-16QAM over 7-core MCF using ECL. Frequency offset compensation of SCR enables demodulation and tolerates more than 10% path difference. Phase noise compensation of SCR enables to extend the transmitted distance, when using DFB, up to 1650km provided precise skew adjustment.

We.2.D.5 • 12:15
Interleaved Core Assignment for Bidirectional Transmission in Multi-Core Fibers
Feihong Ye1, T Morioka1; 1DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Denmark
We study interleaved core assignment for bidirectional transmission in multi-core fibers. By combining it with heterogeneous core structure in an 18-core fiber, the transmission distance is extended by 10 times compared to homogeneous core structure with unidirectional transmission, achieving a total capacity of 1 Pb/s per direction.



We.2.E • 11:00 - 12:30
Flex Grid Networks
Chair: Achim Autenrieth, ADVA Optical Networking, Germany


We.2.E.1 • 11:00 Invited
What is the Benefit of Elastic Superchannel for WDM Network?
T Zami1; 1Alcatel-Lucent, France
We discuss the benefits and compromises of elastic spectral efficiency implemented with Nyquist superchannels for the WDM mesh networks featuring static or incremental traffic


We.2.E.2 • 11:30
A Novel Semi-flexible Grid Optical Path Network That Utilizes Aligned Frequency Slot Arrangement
Z-S Shen1, H Hasegawa1, K Sato1, T Tanaka2, A Hirano2; 1Nagoya University, Japan; 2NTT Network Innovation Laboratories, NTT Corporation, Japan
We propose a novel elastic optical path network where each specific bitrate signal uses its own dedicated fixed grid and a slot-width-edge anchor frequency. Numerical evaluations verify that the proposed networks can almost match the performance of conventional flexible grid networks,while allowing tunable filters to be used in a fixed grid system.

We.2.E.3 • 11:45
Effect of Link Margin and Frequency Granularity on the Performance of a Flexgrid Optical Network
A Mitra1, A Lord2, S Kar3, P Wright2; 1Dept. of Electrical Engineering, Indian Institute of Technology, India; 2British Telecom Laboratories, British Telecom (BT), UK 3Dept. of Electrical Engineering and BSTM, Indian Institute of Technology, India
We show how dynamically adjustable modulation formats can be used to reduce optical path operating margins in Flexgrid networks, reverting to lower order reduced OSNR QAM if ageing occurs. Spectral savings amount to as much as 63% across a network but due to use of 64QAM, a fine frequency granularity of 6.25GHz is required.

We.2.E.4 • 12:00
Simulation Results of Shannon Entropy based Flexgrid Routing and Spectrum Assignment on a Real Network Topology
P Wright1, M C Parker2, A Lord1; 1British Telecom, UK; 2Lexden Technologies Ltd, UK
We present a novel RSA algorithm that uses a quantitative fragmentation metric using the concept of Shannon entropy in Flexgrid networks. By applying this metric to a representative network, support for almost 10% more demands in a static growth scenario is shown.

We.2.E.5 • 12:15
Is Flexi-grid Needed Anymore with Spectrally Efficient Time Frequency Packing Terabit Superchannel Technology?
G Meloni1, G Berrettini2, F Fresi2, R Magri3, F Cavaliere3, L Potì1; 1Photonic Networks National Laboratory, CNIT, Italy; 2Scuola Superiore Sant'Anna, Italy; 3Ericsson Telecomunicazioni, Italy
We demonstrate that frequency packing technology breathes new life into existing optical networks by allowing terabit super-channel transport against common opinion that expensive flex-grid infrastructure upgrade is required. 4.2 to 5.69 b/s/Hz spectral efficiency is obtained over ULH reach


We.2.F • 11:00 -- 12:30
High Availability Access
Chair: Dirk Breuer, Deutsche Telekom AG, Germany


We.2.F.1 • 11:00
Automatic Restoration over a Type B Dual Parented PON Using VLAN Switching
A Rafel1, N Parkin1, K Farrow1, P Wright1, D Nesset1; 1BT Research and Innovation, UK
We propose an automated solution for end-to-end traffic restoration based on Ethernet OAM and VLAN switching over a type B dual parented PON. A prototype based on a commercial GPON is used to report results obtained in a lab configuration.

We.2.F.2 • 11:15
Centralized Monitoring of True Splice Loss in PON Including MFD Mismatched Fibres
H Takahashi1, K Toge1, F Ito1; 1NTT Access Network Service System Laboratories, Japan
We present a technique for the centralized monitoring of true splice loss in branched fibres, even when G.652 and G.657 fibres are combined, using end-reflection-assisted Brillouin-analysis. And we realize a splice loss accuracy of better than 0.1-dB in 8-branched PON.

We.2.F.3 • 11:30
Frequency-Code Multiplexed End Reflection Assisted Brillouin Analysis for Monitoring PONs
C Kito1, F Ito1, H Takahashi1, K Toge1; 1NTT Access Networks Service Systems, Japan
We use frequency-code multiplexing in dynamic range enhancement technique for end reflection assisted Brillouin analysis that can monitor PON branches individually. 12-frequency code multiplexing is used for monitoring 8-branched fibres, and signal to noise ratio is improved by 4.5 dB.

We.2.F.4 • 11:45
Simple ONU Transmitter Based on Direct-Phase Modulated DFB Laser with Heterodyne Detection for udWDM-PON
I N Cano1, A Lerín1, V Polo1, J Tabares1, J Prat1; 1Universitat Politecnica de Catalunya, Spain
A direct phased modulated DFB laser with a simple equalizer is proposed for cost-effective ONU implementation in udWDM-PON. DBPSK data is successfully transmitted at 1.25Gb/s achieving a receiver sensitivity of -42dBm at a BER=10-3 with heterodyne detection while a penalty of less than 1dB is observed with 75km when compared with btb

We.2.F.5 • 12:00
An Automatic Load-balancing DWBA Algorithm Considering Long-time Tuning Devices for λ-tunable WDM/TDM-PON
T Yoshida1, S Kaneko1, S Kimura1, N Yoshimoto1; 1NTT Access Network Service Systems Laboratories, NTT Corporation, Japan
We propose an automatic load-balancing DWBA algorithm for λ-tunable WDM/TDM-PONs. The algorithm is widely applicable despite the use of long-time tuning devices. We have confirmed with simulations that the proposed algorithm properly activates λ-tuning when the load-balancing is needed although the λ-tuning period is much longer than the DBA cycle.


We.3.A • 14:00 -- 15:30
Phase Sensitive Signal Processing
Chair: Michele Midrio, Università di Udine, Italy


We.3.A.1 • 14:00
Mitigation of Nonlinear Impairments on QPSK Data in Phase-Sensitive Amplified Links
B Corcoran1, S L I Olsson1, C Lundström1, M Karlsson1, P A Andrekson1; 1Fiber Optic Communications Research Center (FORCE), Photonics Laboratory, Dept. Microtechnology and Nanoscience, Chlamers University of Technology, Sweden
We investigate the mitigation of nonlinear impairments via phase-sensitive amplification. We show in simulation and experiment that this effect can be optimized through engineering link dispersion. A phase-sensitive amplified link is measured to reduce nonlinear penalties by over 3dB compared to a phase-insensitive amplified link.

We.3.A.2 • 14:15
QAM Phase-Regeneration in a Phase-Sensitive Fiber-Amplifier
T Richter1, R Elschner1, C Schubert1; 1Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute, Germany
We demonstrate the use of a four-level phase-regenerator for QAM regeneration. The regenerator is based on a black-box fiber-based phase-sensitive amplifier. General conclusions are derived from investigations with 25-GBd star-8QAM.

We.3.A.3 • 14:30
Demonstration of Degenerate Vector Phase-Sensitive Amplification
A L Riesgo1, C Lundström1, M Karlsson1, P A Andrekson1; 1Photonics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Sweden
The performance of a degenerate vector (dual cross-polarized pump) phase-sensitive amplifier (PSA) is characterized and compared to a degenerate scalar (dual co-polarized pump) PSA. In both schemes, we assess the gain as a function of the signal state of polarization, verifying its compliance with theory, and the phase transfer function.

We.3.A.4 • 14:45 Contributed Submission
Digital Phase-Locked Loop-Stabilized Four-Mode Phase-Sensitive Parametric Multicasting
Lan Liu1, Zhi Tong1, A O J Wiberg1, E Myslivets1, B P Kuo1, N Alic1, S Radic1; 1University of California San Diego, USA
Digital phase-locked loop was implemented for stabilization of dual-pump driven, four-mode phase-sensitive multicasting. A stable operation of more than 20-copy-count multicast with a 12-dB conversion efficiency improvement over the phase-insensitive case is demonstrated for the first time.

We.3.A.5 • 15:00
Low-penalty Phase De-multiplexing of QPSK Signal by Dual pump Phase Sensitive Amplifiers
M Gao1, T Kurosu1, T Inoue1, S Namiki1; 1National Institute of Advanced Industrial Science and Technology (ASTI), Network Photonics Research Centre, Japan
We demonstrate phase de-multiplexing of QPSK signal to BPSK signals based on dual-pump phase sensitive amplifiers by controlling and stabilizing the gain axis. The de-multiplexed BPSK signals have an OSNR penalty less than 1-dB compared to the back-to-back BPSK signals.

We.3.A.6 • 15:15
All-optical Signal Processing for 16-QAM Using Four-Level Optical Phase Quantizers Based on Phase Sensitive Amplifiers
A Bogris1, D Syvridis2; 1Department of Informatics, Technological Educational Institute of Athens, Greece; 2Optical Communications Laboratory Informatics and Telecommunications, University of Athens, Greece
The potential of four-level optical phase quantizers towards coherent processing of advanced modulation formats such as 16-QAM is proposed and numerically demonstrated. The work shows that phase quantization can demultiplex 16-QAM into two QPSK signals enabling sub-channel switching and optical regeneration of 16-QAM modulation formats.


We.3.B • 14:00 -- 15:30
Modulators II
Chair: Marco Romagnoli, CNIT, Italy


We.3.B.1 • 14:00
Monolithically Integrated 10Gbit/sec Silicon Modulator with Driver in 0.25µm SiGe:C BiCMOS
L Zimmermann1, D J Thomson2, B Goll3, D Knoll1, S Lischke1, F Y Gardes2, Y Hu2, G T Reed2, H Zimmermann3, H Porte4; 1IHP, Germany; 2Optoelectronics Research Centre University of Southampton, UK; 3Vienna University of Technology, Austria; 4PHOTLINE Technologies, France
We present the first monolithic photonic integration in the electronic frontend of a high-performance BiCMOS technology. 10Gbit/sec operation of a Silicon Mach-Zehnder modulator device with 8dB extinction in dual-drive is demonstrated.

We.3.B.2 • 14:15
20Gb/s Silicon Ring Modulator Co-Integrated with a Ge Monitor Photodetector
M Pantouvaki1, P Verheyen1, G Lepage1, J De Coster1, H Yu2, P De Heyn2, P Absil1, J Van Campenhout1; 1IMEC, Belgium; 2Dept. of Information Technology, Ghent University, Belgium
We demonstrate the monolithic integration of a 20Gb/s silicon ring modulator with low dark-current Ge monitor photodetectors. The wavelength exhibiting optimum modulation performance can be tracked by measuring the photocurrent of monitor photodetectors implemented at the through and drop port of the ring modulator.

We.3.B.3 • 14:30 Invited
High-Speed Silicon-Organic Hybrid (SOH) Modulator with 1.6 fJ/bit and 180 pm/V In-Device Nonlinearity
R Palmer1, S Koeber1, W Heni1, D L Elder2, D Korn1, H Yu3, L Alloatti1, S Koenig1, P C Schindler1, W Bogaerts3, M Pantouvaki4, G Lepege4, P Verheyen4, J Van Campenhout4, P Absil4, R Baets3, L R Dalton2, W Freude1, J Leuthold1,5, C Koos1; 1Karlsruhe Institute of Technology, Institutes IPQ and IMT, Germany; 2University of Washington, Dept. of Chemistry, USA; 3IMEC Photonics Research Group, Ghent University, Belgium; 4IMEC vzw., Belgium; 5Electromagnetic Fields & Microwave Electronics Laboratory, ETH-Zurich, Switzerland
We report on a 40Gbit/s silicon-organic hybrid (SOH) modulator with 11dB extinction ratio. A novel electro-optic chromophore with record in-device nonlinearity of 180pm/V leads to VπL=0.5Vmm and a low energy consumption of 1.6fJ/bit at 12.5Gbit/s.

We.3.B.4 • 15:00 Invited
High-speed Silicon Modulators
T Chu1, X Xiao1, H Xu1, X Li1, Z Li1, J Yu1, Y Yu1; 1Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, China
Several high-speed silicon modulators are demonstrated, including a 60-Gbps MZI modulator with 1.6-dB optical loss, a 25-Gbps microring modulator with misalignment-tolerant interleaved PN junctions, a 60-Gbps microring resonator modulator and a 4x50 Gbps WDM modulator.



We.3.C • 14:00 - 15:30
Compensation for Nonlinear Effects
Chair: Ernesto Ciaramella, Scuola Superiore Sant'Anna, Italy


We.3.C.1 • 14:00
Efficient Transmitter-side Nonlinear Equalizer for 16QAM
T Oyama1, H Nakashima2, T Hoshida2, Z Tao3, C Ohshima1, J C Rasmussen2; 1Fujitsu Laboratories Ltd., Japan; 2Fujitsu Ltd, Japan; 3Fujitsu R&D Center, China
We propose and numerically evaluate a simplified pre-distortion algorithm to compensate intra-channel nonlinearity for 16QAM, which provides gate-count reduction through multiplier-free implementation. We confirm the tolerance to chromatic dispersion uncertainty and the applicability to different pulse formats.

We.3.C.2 • 14:15
Simple Optimization Method for Nonlinear Compensation by Filtered Backpropagation-based Equalization Utilizing Intra-stage Dispersion
W Maeda1, D Ogasahara1, J Abe1, T Ito1, M Arikawa1, H Noguchi1, K Fukuchi1; 1Green Platform Research Laboratories, NEC Corporation, Japan
We propose a simple optimization method based on the relation between the filter configuration and the dispersion compensated at each stage in order to maximize filtered backpropagation performance. We validate our method with the transmission of 127-Gb/s PM-QPSK signal over all SMF 2400 km line in nonlinear regime.

We.3.C.3 • 14:30
Novel Polarization-diversity Scheme Based on Mutual Phase Conjugation for Fiber-nonlinearity Mitigation in Ultra-long Coherent Optical Transmission Systems
H Lu1, Y Mori1,2, C Han1,3, K Kikuchi1; 1Dept. of Electrical Engineering and Information Systems, The University of Tokyo, Japan; 2Nagoya University, Japan; 3Electronics and Telecommunications Research Institute (ETRI), Republic of Korea
We propose a novel method of fiber-nonlinearity mitigation for ultra-long optical transmission systems, which employs two polarization modes mutually phase-conjugated. Simulations and experiments show that in the nonlinear region, this diversity method significantly outperforms both of the single- and dual-polarization schemes at the same bit rate.

We.3.C.4 • 14:45
Extending Digital Backpropagation to Account for Noise
N V Irukulapati1, H Wymeersch1, P Johannisson2, E Agrell1; 1Dept. of Signals and Systems, Chalmers University of Technology, Sweden; 2Dept. of Microtechnology and Nanoscience, Chalmers University of Technology, Sweden
We propose a maximum a posteriori-based scheme that extends digital backpropagation (DBP) by accounting for the nonlinear signal-noise interaction. With periodic dispersion compensation we find up to 20% reach improvement over DBP. For uncompensated links DBP is close to optimal.

We.3.C.5 • 15:00
Coherent Intradyne Opto-Electro-Optic Spectral Inverter and its Application for SPM Mitigation and Wavelength Conversion
A Klekamp1, F Buchali1; 1Alcatel-Lucent, Bell Labs, Germany
We report on a new joint coherent intradyne o/e/o spectral inverter and wavelength converter applied for midspan spectral inversion (MSI). MSI leads to an increase in nonlinear threshold for 16QAM 200 Gb/s signals of 2.4 and 1.6 dB in single channel and DWDM experiment, respectively, and is used to double the transmission distance.

We.3.C.6 • 15:15
Simplified Volterra Series Nonlinear Equalizer by Intra-Channel Cross-Phase Modulation Oriented Pruning
F P Guiomar1, S B Amado1, N J Muga1, J D Reis1, A L Teixeira1,2, A N Pinto1; 1Dept. of Electronics, Telecommunications and Informatics, University of Aveiro, Instituto de Telecomunicações, Portugal; 2Nokia Siemens Networks Portugal S.A., ON WSM,  Portugal
We propose a simplified Volterra series nonlinear equalizer (VSNE) based on a pruned symmetric reconstruction of the third-order kernel. In a 224 Gb/s PM-16QAM transmission system with 1600 km, the number of complex multiplications has been reduced by 3 orders of magnitude relatively to the full VSNE, at the expense of 1.3 dB performance penalty.


We.3.D • 14:00 --15:30
Space Division Multiplexing II
Chair: Huug De Waardt, COBRA - Eindhoven University of Technology, Netherlands


We.3.D.1 • 14:00
Simultaneous Turbulence Compensation of Multiple Orbital-Angular-Momentum 100-Gbit/s Data Channels using a Gaussian Probe Beam for Wavefront Sensing
Y Ren1, G Xie1, H Huang1, C Bao1, Y Yan1, N Ahmed1, M P J Lavery2, B Erkmen3, S J Dolinar3, M Tur4, M Neifeld5, M J Padgett2, R Boyd6, J H Shapiro7, A E Willner1; 1Dept. of Electrical Engineering, University of Southern California, USA; 2School of Physics and Astronomy, University of Glasgow, UK; 3Jet Propulsion Laboratory, California Institute of Technology, USA; 4School of Electrical Engineering, Tel Aviv University, Israel; 5Dept. of Electrical and Computer Engineering, University of Arizona, USA; 6Dept. of Physics and Astronomy, The Institute of Optics, University of Rochester, USA; 7Research Laboratory of Electronics, Massachusetts Institute of Technology, USA
The simultaneous compensation of OAM modes propagating through turbulent channel is experimentally demonstrated by using a Gaussian probe beam for wavefront sensing. The experiment results indicate that the turbulence-induced crosstalk and power penalty could be efficiently mitigated by ~12.5 dB and ~11 dB respectively.

We.3.D.2 • 14:15
2.576Tb/s (23×2×56Gb/s) Mode Division Multiplexed 4PAM over 11.8 km Differential Mode Delay Uncompensated Few-Mode Fiber using Direct Detection
R J H van Uden1, C M Okonkwo1, H S Chen1, F M Huijskens1, B Corbett2, R Winfield2, H De Waardt1, A M J Koonen1; 1COBRA Research Institute, Eindhoven University of Technology, Netherlands; 2Tyndall National Institute, University College Cork, Ireland
2.576Tb/s (23×2×56Gb/s) mode division multiplexed transmission over 11.8km differential mode delay uncompensated few-mode fiber is experimentally demonstrated using direct-detection and 28GBaud 4-level pulse amplitude modulation (4PAM). Assuming 27.5% (training sequence, framing, and error correcting) overhead, the net bit-rate is 1.87Tb/s.

We.3.D.3 • 14:30 Invited
Nonlinear Equations of Propagation in Multi-Mode Fibers with Random Mode Coupling
A Mecozzi1, C Antonelli1, M Shtaif2; 1University of L'Aquila, Italy 2Tel Aviv University, Israel
We review the fundamental equations describing nonlinear propagation in multi-mode fibers in the presence of random mode coupling within quasi-degenerate groups of strongly coupled modes. Our results generalize to the multi-mode propagation regime the Manakov equation describing mode coupling between polarizations in single-mode fibers.


We.3.D.4 • 15:00
Splice Induced Nonlinear Performance Penalty in Mode-Division Multiplexed Transmission Systems
G Rademacher1, S Warm1, K Petermann1; 1Technische Universität Berlin, FB Hochfrequenztechnik, Germany
We investigate mode-division multiplexed transmission systems that employ several spans of few-mode fibers regarding the influence of splice-induced mode coupling on the transmission performance. We show that the combination of nonlinearities splice-induced coupling leads to a strongly impaired transmission performance.



We.3.E • 14:00 - 15:30
Elastic Networks: Control Plane
Chair: Jean-Pierre Hamaide, Alcatel-Lucent, France


We.3.E.1 • 14:00 Invited
Control Plane Solutions for Dynamic and Adaptive Flexi-grid Optical Networks
R Muñoz1, R Casellas1, R Martínez1, R Vilalta1; 1Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Spain
We present an overview of control plane architectures for dynamic and adaptive provisioning and rerouting of elastic optical connections. First, distributed control plane architectures combining GMPLS with stateless and stateful PCEs are discussed. Next, we detail different deployment models of the PCE in the OpenFlow centralized control plane

We.3.E.2 • 14:30
Software-Defined Fragmentation-Aware Elastic Optical Networks Enabled by OpenFlow
L Liu1, Y Yin1, M Xia2, M Shirazipour3, Z Zhu4, R Proietti1, Q Xu3, S Dahlfort2, S J Ben Yoo1; 1University of California, Davis, USA; 2Ericsson Research Silicon Valley, USA; 3Ericsson Research, Canada; 4University of Science and Technology of China, China
We present a software-defined fragmentation-aware elastic optical network, in which an extended OpenFlow-based control plane intelligently routes connection requests to avoid spectrum fragmentation. The overall feasibility and efficiency of the proposed scenario is validated by using both numerical simulation and experimental demonstration.

We.3.E.3 • 14:45
Experimental Evaluation of Delay-Sensitive Traffic Routing in Multi-Layer (Packet-Optical) Aggregation Networks for Fixed Mobile Convergence
R Martínez1, R Casellas1, R Muñoz1, R Vilalta1; 1Centre Technològic de Telecomunicacions de Catalunya, (CTTC), Spain
An experimental evaluation of delay-sensitive traffic routing within GMPLS multi-layer (MPLS-TP/WSON) aggregation networks for fixed mobile convergence is presented. We compare the performance of two novel routing algorithms designed to fulfill both the delay and bandwidth service requirements while exploiting the multi-layer (grooming) objectives.

We.3.E.4 • 15:00
Optical Control Plane Based on an Analytical Model of Non-Linear Transmission Effects in a Self-Optimized Network
R Pastorelli1, S Piciaccia1, G Galimberti1, E Self1, M Brunella1, G Calabretta1, F Forghieri1, D Siracusa2, A Zanardi2, E Salvadori2, G Bosco3, A Carena3, V Curri3, P Poggiolini3; 1Cisco Photonics Italy srl, Italy; 2CREATE-NET, Italy; 3Dip. di Elettronica e TelecomunicazioniET, Politecnico di Torino, Italy
In pure coherent networks, the real time application of a recently proposed analytical non-linear model allows network performance optimization. Control Plane circuit restoration based on this approach intrinsically avoids crank-back processes. An experiment demonstrates the optimum routing process in a self-configured network.


We.3.E.5 • 15:15 
Evaluation of Strategies for Dynamic Routing Algorithms in Support of Flex-Grid based GMPLS Elastic Optical Networks
I Turus1, J Kleist1, A M Fagertun2, L Dittmann2; 1NORDUnet A/S, Denmark; 2Department of Photonics Engineering, Technical University of Denmark, Denmark
We evaluate OSPF-TE extensions within GMPLS framework in support of flex-grid optical networks. Based on OSPF-TE LSAs, two routing strategies are proposed achieving up to 15% and 70% respectively improved blocking ratio for low loaded network (10-30 Erlangs) compared to the shortest path scenario.


We.3.F • 14:00 - 15:30
Coherent Access
Chair: Albert Rafel, BT, UK


We.3.F.1 • 14:00
Coherent Reflective PON architecture: can it be made compatible with TWDM-PON?
S Straullu2, F Forghieri3, G Bosco1, V Ferrero1, R Gaudino1; 1Politecnico di Torino, Italy; 2Istituto Superiore Mario Boella, Italy; 3CISCO Photonics, Italy
We discuss the compatibility between reflective PON architectures and the recently defined TWDM-PON for NG-PON2. Focusing on the upstream, we experimentally demonstrate that, by using burst-mode coherent detection at OLT, reflective PON can achieve the specification target set for TWDM-PON, without requiring precise wavelength accuracy at ONU.

We.3.F.2 • 14:15
System Demonstration of a Time and Wavelength-Set Division Multiplexing PON
D van Veen1, W Poehlmann2, J Galaro1, B Deppisch2, A Duque1, M F Lau1, B Farah1, T Pfeiffer2, P Vetter1; 1Alcatel-Lucent, Bell Labs, USA; 2Alcatel-Lucent, Bell Labs, Germany
We present a full system implementation of TWSDM-PON based on a low cost tunable laser in the ONU and featuring automated wavelength initialization and tracking processes that are seamlessly added to the existing XGPON1 ONU activation protocol.

We.3.F.3 • 14:30
A Novel Flexible Optical Remote Node Architecture for Dynamic Wavelength Allocation over Hybrid WDM/TDM PON Systems
M-F Huang1, D Qian1, N Cvijetic1, P N Ji1, T Wang1; 1NEC Laboratories America Inc., USA
We demonstrate a flexible optical remote node architecture enabled dynamic wavelength allocation for converged optical access and mobile backhaul applications. Source-free and colorless ONUs have been realized in a bidirectional long-reach 80km hybrid WDM/TDM PON with a 1:32 passive split

We.3.F.4 • 14:45
Coherent SCM-WDM-PON System using OFDM or Single Carrier with SSB Modulation and Wavelength Reuse
C Kottke1, J von Hoyningen-Huene2, M Eiselt3, H Griesser3, J P Elbers3, K Habel1, W Rosenkranz2; 1Heinrich-Hertz-Institute, Fraunhofer Institute for Telecommunications,  Germany; 2Chair for Communications, University of Kiel, Germany; 3ADVA Optical Networking SE, Germany
We propose a SCM-WDM-PON system, suitable for up to 320 users at 1 Gb/s, using SSB modulation and wavelength reuse for colorless ONUs. The experimental results demonstrate the feasibility of this concept, showing increased spectral efficiency at cost of a small penalty for the OFDM case as compared to single carrier DQPSK modulation.

We.3.F.5 • 15:00
A 1.25 Gb/s Low-Cost Coherent PON
M Presi1, G Cossu1, R Corsini1, F Bottoni1, E Ciaramella1; 1Scuola Superiore Sant'Anna, Istituto TeCIP, Italy
We demonstrate a 1.25 Gb/s long reach PON (66 km+1:128 split) based on a simplified phase-diversity homodyne coherent receiver, which uses a common DFB as local oscillator, has simple processing and needs no frequency locking. -48 dBm sensitivity and good channel selectivity (6.25 GHz) are achieved.

We.3.F.6 • 15:15
Flexible TWDM PON with Load Balancing and Power Saving
N Cheng1, L Wang2, D Liu2, B Gao2, J Gao2, X Zhou2, H Lin2, F Effenberger1; 1American Research Centre, Huawei Technologies, USA; 2Advanced Technology Dept., Huawei Technologies, China
A flexible TWDM PON system is proposed which allows pay-as-you-grow deployment of OLT transceiver modules, supports load balancing among different ODNs and achieves significant power saving at OLT. A proof-of-concept experimental testbed confirms the feasibility of the proposed system with 40Gb/s symmetric capacity and more than 38 dB power budget


We.4.A • 16:00 - 17:30
Fibre Amplifiers for SDM
Chair: Tommy Geisler, OFS Denmark


We.4.A.1 • 16:00 Invited
Multicore Erbium Doped Fiber Amplifiers for Space Division Multiplexed System
K Abedin1, T Thierry1, J Fini1, M Yan1, B Zhu1, E Monberg1, F Dimarcello1, V R Supradeepa1, D DiGiovanni1; 1OFS Laboratories, USA
We report on recent development of core- and cladding-pumped multicore fiber amplifiers suitable for amplifying space division multiplexed signals. Amplification, noise properties of these amplifiers are shown, and scopes for further development will be discussed


We.4.A.2 • 16:30
Few-mode EDFA Supporting 5 Spatial Modes with Reconfigurable Differential Modal Gain Control
Y Jung1, Q Kang1, J K Sahu1, B Corbett2, R Winfield2, FPoletti1, S U Alam1, David J Richardson1; 1 Optoelectronics Research Centre, Southampton University, UK; 2Tyndall National Institute, University of College Cork, Ireland
We experimentally demonstrate a FM-EDFA supporting 5 spatial modes with reconfigurable differential gain control and excellent gain-flatness obtained through mode-selective bi-directional pumping of a custom fiber with a radially-profiled erbium dopant distribution

We.4.A.3 • 16:45
Few Mode Er3+-Doped Fiber with Microstructured Core Enabling Spectral and Modal Gain Equalization for Spatial Division Multiplexing
G Le Cocq1, L Bigot1, A Le Rouge1, G Bouwmans1, H El Hamzaoui1, K Delplace1, M Bouazaoui1, Y Quiquempois1; 1PhLAM/IRCICA Université de Lille1, France
Simulations and experimental results on Er3+-doped fibers that amplify 6 modes over the C-band are reported. It is shown that complex Er3+-doping profile can hardly be achieved by MCVD process and that microstructuring the core could be an alternative to tailor the Er3+ doping profile. As a proof of concept, such a fiber is modeled and realized.

We.4.A.4 • 17:00 
12-Core Double-Clad Er/Yb-Doped Fiber Amplifier Employing Free-space Coupling Pump/Signal Combiner Module
H Ono1, K Takenaga2, K Ichii2, S Matsuo2, T Takahashi1, H Masuda3, M Yamada4; 1NTT Photonics Laboratories, NTT Corporation, Japan; 2Optics and Electronics Laboratory, Fujikura Ltd., Japan; 3Interdisciplinary Faculty of Sci. and Eng., Shimane University, Japan; 4Graduate School of Engineering, Osaka Prefecture University, Japan
We demonstrate the simultaneous 12-core amplification of a double-clad Er/Yb-doped fiber amplifier by using newly developed free-space coupling pump/signal combiner modules equipped with multi-core fiber pigtails. C-band amplification is successfully achieved using a 5-m long double-clad Er/Yb-doped fiber.

We.4.A.5 • 17:15
Cladding-Pumped Seven-Core EDFA Using a Multimode Pump Light Coupler
S Takasaka1, H Matsuura2, W Kumagai2, M Tadakuma1, Y Mimura1, Y Tsuchida1, K Maeda1, R Miyabe1, K Aiso1, K Doi2, R Sugizaki1; 1FITEL photonics Lab., Furukawa Electric Co., Ltd., Japan; 2Dept. of Mechanical Engineering, Tohoku Gakuin University, Japan
We demonstrate a cladding-pumped seven-core erbium-doped fibre amplifier. A developed multimode pump light coupler enables the cladding pump. We measure amplification characteristics of all the seven cores and obtain gain of >14dB, noise figure of <9dB in C-band. Total crosstalk for the centre core is -32.7 dB.


We.4.B • 16:00 - 17:30
Devices for Switching
Chair: Bert Offrein, IBM Research GmbH, Switzerland


We.4.B.1 • 16:00
An 8×8 Broadcast-and-Select Optical Switch Based on Monolithically Integrated EAM-Gate Array
T Segawa1, M Nada1, M Nakamura1, Y Suzaki1, R Takahashi1; 1NTT Photonics Laboratories, NTT Corporation, Japan
A compact, low-power 8×8 broadcast-and-select optical switch is developed based on a high-speed EAM-gate array supporting a wide flat wavelength band. The switch is free from optical/electrical crosstalk and undesirable nonlinear effects observed in SOA-based switches. Error-free switching is demonstrated for 25-Gbps burst-mode optical packets.

We.4.B.2 • 16:15 
Dynamic Multi-Path WDM Routing in a Monolithically Integrated 8x8 Cross-Connect
R Stabile1, A Rohit1, K A Williams1; 1COBRA Research Institute, Eindhoven University of Technology, Netherlands
We demonstrate for the first time WDM multi-path routing through a monolithically integrated 8x8 cross-connect. Sixteen WDM data channels are dynamically routed from four inputs with excellent OSNR of 27.0-31.1 dB and nanosecond switch time.

We.4.B.3 • 16:30
Silica-Based 100-GHz-Spacing Integrated 40-λ 1×4 Wavelength Selective Switch
T Yoshida1, H Asakura1, T Mizuno2, H Takahashi2, H Tsuda1; 1Graduate School of Science and Technology, Keio University, Japan; 2NTT Photonics Laboratories, NTT Corporation, Japan
A densely integrated 1×4 wavelength selective switch (WSS) is designed and fabricated. The channel spacing is 100 GHz and the number of channels is 40. The transmission losses and the crosstalk are less than 8.8 dB and -19.4 dB, respectively.

We.4.B.4 • 16:45
Dynamic Multi-Path Routing in a Fifth-Order Resonant Switch Matrix
P Dasmahapatra1, R Stabile1, A Rohit1, K A Williams1; 1COBRA Research Institute, Eindhoven University of Technology, Netherlands
Dynamic multi-path routing is studied for the first time in a cross-point switch matrix comprising fifth order resonant switch elements. Connections are made between eight inputs and two outputs with on-chip losses of up to 9.5dB and 35µs guard times between the configured paths.

We.4.B.5 • 17:00 
Polarization Diversity 2×2 Switch with Silicon-Wire Waveguide
S-H Kim1, Y Shoji1, G Cong1, H Kawashima1, T Hasama1, H Ishikawa1; 1Network Photonics Research Centre, National Institute of Advanced Industrial Science and Technology, Japan
A polarization independent 2×2 switch based on silicon wire waveguide was fabricated. We built a diversity circuit consists of polarization splitters/combiners, TE-TM intersections, and TE- and TM- switches. Polarization-independent operation was demonstrated. Extinction ratio achieved 30 dB at wavelength of 1550 nm.

We.4.B.6 • 17:15
Fiber-Port-Count in Wavelength Selective Switches for Space-Division Multiplexing
N K Fontaine1, R Ryf1, D T Neilson1; 1 Bell Labs, Alcatel-Lucent, USA
We show that the fiber count of a space-division multiplexed (SDM) wavelength selective switch can match an equivalent single-mode WSS using a mode-remapper at the switch input and a proportional increase in spectral-resolution. Otherwise, the fiber count decreases proportional to the number of modes in the steering dimension.


We.4.C • 16:00 - 17:30
Transmitter Subsystems II
Chair: Johan Bauwelinck, Ghent University, Belgium


We.4.C.1 • 16:00
5.3 GHz Modulation Passband for Fiber Lengths Up to 100 km Using a Directly Modulated Passive Feedback Laser
A S Karar1, A M Rezania1, N Deb1, J C Cartledge1; 1Dept. of Electrical and Computer Engineering, Queen's University, Canada
The chirp and bandwidth tuneability of a passive feedback laser are used to obtain a modulation passband that is void of power fading dips and allows the transmission of 21.418 Gbit/s and 10.709 Gbit/s SCM signals over 61 km and 102 km of SMF, respectively.

We.4.C.2 • 16:15
Single-channel 1.28 Tbit/s Transmission over 58 km in the 1.1 um Band with Wideband GVD and Dispersion Slope Compensation
K Koizumi1, T Hirooka1, M Yoshida1, M Nakazawa1; 1Research Institute of Electrical Communication, Tohoku University, Japan
We demonstrate a single-channel 1.28 Tbit/s subpicosecond pulse transmission at 1.1 πm using a high-Δ single-mode step index fiber and ytterbium-doped fiber amplifiers. With a chirped fiber Bragg grating and pre-chirping technique for wideband GVD and dispersion slope compensation, 58 km transmission was successfully achieved.

We.4.C.3 • 16:30 Invited
100 Gbit/s Using Intensity Modulation and Direct Detection
J C Cartledge1, A S Karar1; 1Dept. of Electrical and Computer Engineering, Queen's University, Canada
Recent advances in short reach 100 Gbit/s intensity modulation and directed detection systems are reviewed with a focus on 16-QAM half-cycle Nyquist subcarrier modulation, generated using a directly modulated passive feedback laser and polarization multiplexing emulation.

We.4.C.4 • 17:00
Pulse-Carver-Free RZ-64 QAM Transmitter with Electronic CD Pre-Compensation and Auto Bias Control
H Kawakami1, T Kobayashi1, K Yonenaga1, Y Miyamoto1; 1NTT Network Innovation Laboratories, NTT Corporation, Japan
We propose a simple optical return to zero quadrature amplitude modulation (RZ-QAM) transmitter with Auto Bias Control (ABC) circuit. This transmitter is pulse carver free and offers electronic pre-compensation for chromatic dispersion (CD). Measured penalty induced by ABC was less than 0.2 dB, with and without CD pre-compensation.


We.4.D • 16:00 - 17:30
Nonlinear Fibre Capacity
Chair: Rene-Jean Essiambre, Alcatel-Lucent, USA


We.4.D.1 • 16:00
Reach Comparison of Next Generation Optical Fibers with EDFA/Raman Amplification
K Balemarthy1, R Lingle Jnr2; 1OFS, India; 2OFS, USA
Using the Gaussian Noise model for nonlinearities, we show that larger effective area fibers are more beneficial compared to lower loss fibers with EDFA/Raman amplification even with realistic pump power and EDFA output power limits.


We.4.D.2 • 16:15
Nonlinearity Compensation Benefit in High Capacity Ultra-Long Haul Transmission Systems
J-X Cai1, O V Sinkin1, H Zhang1, H G Batshon1, M Mazurczyk1, D G Foursa1, A Pilipetskii1, G Mohs1; 1TE SubCom, USA
We experimentally investigate digital back propagation (DBP) benefit versus channel pre-emphasis, average launch power per channel, and transmission distance. We find the DBP benefit scales monotonically with channel power and transmission distance. Measurement results match well with theory.

We.4.D.3 • 16:30 Invited
Nonlinear Fiber Capacity
E Agrell1; 1 Dept. of Signals and Systems, Chalmers University of Technology, Sweden
In this semi-tutorial presentation, we review fundamental information theory for links with and without memory, in the linear and nonlinear regimes. A comparison between channel models with long (but finite) memory and infinite memory yields an unexpected result.  

We.4.D.4 • 17:00
System Benefits of Digital Dispersion Pre-Compensation for Non-Dispersion-Managed PDM-WDM Transmission
A Ghazisaeidi1, J Renaudier1, M Salsi1, P Tran1, G Charlet1, S Bigo1; 1Alcatel-Lucent Bell Labs, France
We studied the system benefits of applying dispersion pre-compensation using programmable DAC, on the performance of 32.5 Gbaud root-raised-cosine pulse-shaped PDM-WDM BPSK, QPSK, and 16QAM. With 50% dispersion pre-compensation, for BPSK 1.5 dB improvemement of optimum Q2-factor is observed while for QPSK and 16QAM no improvement was observed.

We.4.D.5 • 17:15 
Experimental Demonstration of Capacity-Achieving Phase-Shifted Superposition Modulation
J Estaran1, D Zibar1, A Caballero1, C Peucheret1, I T Monroy1; 1DTU Fotonik, Technical University of Denmark, Denmark
We report on the first experimental demonstration of phase-shifted superposition modulation (PSM) for optical links. Successful demodulation and decoding is obtained after 240 km transmission for 16-, 32- and 64-PSM.


We.4.E • 16:00 - 17:30
Control Plane & PCE
Chair: Suzuki Masatoshi, KDDI Labs


We.4.E.1 • 16:00
Experimental Demonstration of an Active Stateful PCE Performing Elastic Operations and Hitless Defragmentation
A Castro1, F Paolucci2, F Fresi2, M Imran2, B B Bhowmik3, G Berrettini2, G Meloni4, A Giorgetti2, F Cugini4, L Velasco1, L Potì4, P Castoldi2; 1Universitat Politècnica de Catalunya, Spain; 2Scuola Superiore Sant'Anna, TeCIP,  Italy; 3Electrical Engineering Department, Indian Institute of Technology, India; 4CNIT, Italy  An experimental demonstration of active stateful PCE for flexgrid networks is presented. The PCE enables elastic operations on established connections and, when required, performs hitless defragmentation of spectrum resources. Experimental assessment, including shifting of 400Gbps four sub-carrier superchannel is shown.

We.4.E.2 • 16:15
Minimization of the Impact of the TED Inaccuracy Problem in PCE-Based Networks by Means of Cognition
I Rodríguez1, R J Durán1, D Siracusa2, I de Miguel1, A Francescon2, J C Aguado1, E Salvadori2, R M Lorenzo1; 1Universidad de Valladolid, Spain; 2CREATE-NET, Italy
We propose and demonstrate the benefits of a simple yet effective cognitive technique to enhance stateless Path Computation Element (PCE) algorithms with the aim of reducing the connection blocking probability when relying on a potentially non up-to-date Traffic Engineering Database (TED).

We.4.E.3 • 16:30
Experimental Demonstration of H-PCE with BPG-LS in Elastic Optical Networks
M Cuaresma1, F Muñoz del Nuevo1, S Martinez1, A Mayoral1, O G de Dios1, V Lopez1, J P Fernandez-Palacios1; 1Telefonica I+D, GTCO, Spain
In the H-PCE architecture the mechanism to build the Traffic Engineering Database of the Parent PCE is not defined. This work validates the use of BGP-LS to feed the TED and compares two algorithms that use different amount of information.

We.4.E.4 • 16:45
Resilient Provisioning for Multi-Flow Elastic Optical Networking
M Xia1, S Dahlfort1; 1Ericsson Research, USA
We propose a resilient provisioning scheme for multi-flow elastic optical networking by exploiting elastic traffic assignment and path diversity. Our scheme requires no link-disjoint routing, and significantly reduces resource overbuild from Virtual Concatenation in two sample core networks.

We.4.E.5 • 17:00
Data Center Interconnection Orchestration with Virtual GMPLS-controlled MPLS-TP Networks over a Shared Wavelength Switched Optical Network
R Vilalta1, R Muñoz1, R Casellas1, R Martínez1; 1 Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Spain
We present an Orchestrator architecture to dynamically configure and deploy virtual GMPLS-controlled MPLS-TP networks for data center interconnection over a shared WSON. We evaluate its performance in the ADRENALINE Testbed, in terms of the service setup delay.

We.4.E.6 • 17:15
Emergent Optical Network Integration and Control of Multi-Vendor Optical Networks for Quick Disaster Recovery
S Xu1, N Yoshikane2, M Shiraiwa1, H Furukawa1, T Tsuritani2, Y Awaji1, N Wada1; 1National Institute of Information and Communications Technology (NICT), Japan; 2KDDI R&D Laboratories Inc., Japan
For quick and cost-efficient recovery of backbone network from huge disasters, the emergent optical network integration with the survived multi-vendor optical systems are investigated. Both the data-plane and the control-plane are successfully demonstrated in a two-vendor prototype test-bed.


We.4.F • 16:00 - 17:30
Field Trials and Experiments
Chair: Camille-Sophie Bres, EPFL, Switzerland


We.4.F.1 • 16:00
On-the-Field Demonstration of Quintuple-Play Service Provision in Long-Reach OFDM-based WDM-PON Access Networks
R Llorente1, M Morant1, E Pellicer1, M Herman2, Z Nagy2, T Alves3, A Cartaxo3, J Herrera4, J Correcher5, T Quinlan6, S Walker6, C Rodrigues7, P Cluzeaud8, A Schmidt9, R Piesiewicz10, R Sambaraju11; 1Valencia Nanophotonics Technology Centre, Universitat Politècnica de València, Spain; 2Towercom a.s., Slovakia; 3Instituto de Telecomunicações, Instituto Superior Técnico, Portugal; 4Fibernova Systems S.L., Spain; 5DAS Photonics S.L., Spain; 6School of Computer Science and Electronic Engineering, University of Essex, UK; 7PT Inovaçao, Portugal; 8THALES Communications, France; 9Hochschule für Technik und Wirtschaft Dresden, Germany; 10Wroclawskie Centrum Badan EIT+ sp., Poland; 11CORNING Incorporated, USA
A multi-user 4-wavelength OFDM WDM-PON providing quintuple-play services is demonstrated on-the-field in a long reach FTTH network in Bratislava (Towercom, Slovakia) achieving 60.8km. An OFDM signal bundle is transmitted in coexistence (LTE, WiMAX, UWB, DVB T and ad hoc OFDM GbE) providing 1.45Gbit/s per user.

We.4.F.2 • 16:15
Demonstration of SOA-assisted Open Metro-Access Infrastructure for Heterogeneous Services
H Schmuck1, R Bonk1, W Poehlmann1, C Haslach1, W Kuebart1, D Karnick2, J Meyer2, D Fritzsche3, E Weis3, J Becker2, W Freude2, T Pfeiffer1; 1Alcatel-Lucent Deutschland AG, Bell Labs, Germany; 2Karlsruhe Institute of Technology, Germany; 3Deutsche Telekom AG,(T-Labs) and EICT GmbH, Germany
Simultaneous operation of multiple services showing different modulation formats, multiplexing techniques and bitrates is experimentally demonstrated in an open converged metro-access infrastructure. Signal performance impact of SOA-induced penalties is studied along the chain.

We.4.F.3 • 16:30 Invited
Photonic-assisted RF Transceiver
A Bogoni1, P Ghelfi1,, F Laghezza1, F Scotti1, G Serafino2, S Pinna2,; 1CNIT, Italy; 2Scuola Superiore Sant'Anna, Italy
The concept of photonics-assisted RF transceiver will be detailed. It provides extremely stable multiprotocol signals up to the millimeter waveband, and it optically samples directly at RF multiple heterogeneous RF signals, with increased resolution.

We.4.F.4 • 17:00
Frequency-Reconfigurable Optical-to-Radio Signal Converter Based on Radio-over-Fiber Technology with Optical Frequency Comb
A Kanno1, T Kuri1, I Morohashi1, I Hosako1, T Kawanishi1, Y Yoshida2, K Kitayama2; 1National Institute of Information and Communications Technology, Japan; 2Osaka University, Japan
A frequency-reconfigurable radio-over-fiber (RoF) signal convertor based on an optical frequency comb is proposed for application to a millimeter-wave/terahertz/optical hybrid system. The frequency transition from the RoF signal at 83 GHz to the higher millimeter-wave and terahertz signals is successfully demonstrated.

We.4.F.5 • 17:15
First Demonstration of Energy Efficient IM-DD OFDM-PON using Dynamic SNR Management and Adaptive Modulation
H Kimura1, K Asaka1, H Nakamura1, S Kimura1, N Yoshimoto1; 1NTT Access Network Service System Laboratories, NTT Corporation, Japan
This paper describes the first demonstration of an energy efficient OFDM-PON using the dynamic SNR management. The controlling calculation precision and modulation format optimizes the DSP energy consumption while satisfying the BER requirements. We realize a 58.7% effective energy efficiency per bit in an FPGA-based receiver experimentally.

ECOC 2012 Participation