Tuesday, 20 September, 2011
16:45 -- 18:30
Room A

Tu.6.A • Coding & Performance Monitoring

Chair: Seb Savory; University College London, United Kingdom
Tu.6.A.1 • 16:45
Space-Time Coding Schemes for Optical MIMO
Yejian Chen1, Laurent Schmalen1, Henning B├╝low1, Andreas Leven1, Stephan ten Brink1; 1Bell Labs, Alcatel-Lucent, Germany.
We compare different FEC coding/modulation approaches for increasing data rate over an optical MIMO communication link with respect to achievable rates and code performance.
Tu.6.A.2 • 17:00
Soft Decision Metrics for Differentially Encoded QPSK
Andreas Bisplinghoff1, Christian Cabirol2, Stefan Langenbach3, Wolfgang Sauer-Greff2, Bernhard Schmauss1; 1University of Erlangen, Germany; 2University of Kaiserslautern, Germany; 3Cisco Optical GmbH, Germany.
We investigate phase slip aware soft decision metrics for coherently demodulated differentially encoded QPSK. A low-complexity approximation of a suitable metric has negligible penalty with practical soft decoders and is robust against residual phase noise.
Tu.6.A.3 • 17:15
Over 10 dB Net Coding Gain Based on 20% Overhead Hard Decision Forward Error Correction in 100G Optical Communication Systems
Bomin Li1, Knud J. Larsen1, Darko Zibar1, Idelfonso Tafur Monroy1; 1Department of Photonics Engineering, Technical University of Denmark, Denmark.
We propose a product code with shortened BCH component codes for 100G optical communication systems. Simulation result shows that 10 dB net coding gain is promising at post-FEC BER of 1E-15.
Tu.6.A.4 • 17:30
Experimental Investigation of Digital Compensation of DGD for 112 Gb/s PDM-QPSK Clock Recovery
Darko Zibar1, Julio Cesar R. de Oliviera2, Vitor B. Ribeiro2, Alberto Paradisi2, Julio C. Diniz2, Knud J. Larsen1, Idelfonso Tafur Monroy1; 1DTU Fotonik, Denmark; 2CPQD-Centro dePesquisa e Desenvolvimento em Telecomunicaiones, Brazil.
 For the first time, the impact of DGD on clock recovery for 112Gb/s PDM-QPSK is experimentally investigated and quantified. We propose and experimentally demonstrate novel digital adaptive timing error detector which is robust to DGD
Tu.6.A.5 • 17:45
Simultaneous Clock Recovery and Dispersion, OSNR Monitoring for 112Gbit/s NRZ-DQPSK Using Frequency Down-Conversion Electro-Optical Phase-Locked Loop
He Wen1,2, Lin Cheng1,2, Xiaoping Zheng1,2, Hanyi Zhang1,3, Yili Guo1,3, Bingkun Zhou1,3; 1Dept. Electronic Engineering, Tsinghua University, China; 2The State Key Laboratory on Integrated Optoelectronics, China; 3Tsinghua National Laboratory for Information Science and Technology, China.
A clock recovery scheme simultaneous providing signal performance monitoring is proposed and demonstrated in a 112-Gbit/s NRZ-DQPSK system. By employing optical domain frequency down-conversion, the clock is recovered with standard RF devices.
Tu.6.A.6 • 18:00
Estimating OSNR of Equalised QPSK Signals
David J. Ives1, Benn C. Thomsen1, Robert Maher1, Seb Savory1; 1Electronic and Electrical Engineering, University College London, United Kingdom.
We propose and demonstrate a technique to estimate the OSNR of an equalised QPSK signal. When combined with a single point calibration the OSNR of the input signal was estimated to within 0.5 dB.
Tu.6.A.7 • 18:15
Accurate Performance Estimation in high-speed Digital Optical Links
Andrea Peracchi1, Luca Banchi1, Raffaele Corsini1, Ernesto Ciaramella1; 1Scuola Superiore Sant'Anna, Italy.
A novel technique allows an easy and accurate estimation of the system BER by collecting the statistical distribution of the analog samples, i.e. before decision. The scheme is confirmed by both simulations and experimental measurements.