Tuesday, 20 September, 2011
09:00 -- 10:45
Room A

Tu.3.A • DSP Algorithms I

Chair: John Cartledge; Queen's University, Canada
Tu.3.A.1 • 09:00
A Study on Statistical Equalization of Intra-channel Fiber Nonlinearity for Digital Coherent Optical Systems
Tsuyoshi Yoshida1, Takashi Sugihara1, Hiroki Goto1, Toshiyuki Tokura1, Kazuyuki Ishida1, Takashi Mizuochi1; 1Mitsubishi Electric Corporation, Japan.
A new equalization scheme for intra-channel fiber nonlinearity is proposed. The statistical approximation for accumulated nonlinear phase rotations with discrete residual dispersion permits efficient equalization with limited iterations of the nonlinear equalizer.
Tu.3.A.2 • 09:15
Low Complexity Digital Perturbation Back-propagation
Weizhen Yan1, Zhenning Tao1, Liang Dou1, Lei Li1, Shoichiro Oda2, Takahito Tanimura2, Takeshi Hoshida2, Jens C. Rasmussen2; 1Fujitsu Research & Development Center, China; 2Fujitsu Laboratories Ltd, Japan.
A novel back-propagation algorithm is proposed based on perturbation analysis to compensate the intra-channel nonlinearity. It reduces 85% back-propagation stages in an experiment of dual polarization QPSK transmission over 1500 km dispersion uncompensated link.
Tu.3.A.3 • 09:30
Joint Mitigation of Laser Phase Noise and Fiber Nonlinearity Using Pilot-Aided Transmission for Single-Carrier Systems
Mohamed H. Morsy-Osman1, Lawrence Chen1, David V. Plant1; 1Department of Electrical and Computer Engineering, McGill University, Canada.
Enabled by single-sideband-subcarrier modulation of both quadratures in the DSP-domain, we propose pilot-aided transmission in single-carrier systems to mitigate jointly laser phase noise and fiber nonlinearity. Performance improvement in linear and nonlinear regimes is demonstrated.
Tu.3.A.4 • 09:45
Simple Feed-Forward Wide-Range Frequency Offset Estimator for Optical Coherent Receivers
Júlio C. Diniz1, Eduardo S. Rosa1, Vitor B. Ribeiro1, Reginaldo Silva1, Edson P. Silva1, Adolfo F. Herbster1, Aldário C. Bordonalli2, Júlio Oliveira1; 1CPqD Foundation, Brazil; 2FEEC - DMO, UNICAMP, Brazil.
We propose and experimentally demonstrate a simple, feed-forward, wide-range frequency offset estimator. This frequency offset estimator is robust to spectrum asymmetry caused by electrical and optical filtering of the signal.
Tu.3.A.5 • 10:00
Phase-Noise Tolerant Coherent Polarization-Multiplexed 16QAM Transmission with Digital Delay-Detection
Nobuhiko Kikuchi1, Shinya Sasaki1, Tetsuya Uda2; 1Central Reseach Lab., Hitachi, Japan; 2Telecommunication and Network Systems Division, Hitachi, Japan.
We propose the use of receiver-side digital differential detection for coherent higher-order QAM signaling and demonstrate the improvement of laser linewidth and XPM tolerance in 320-km transmission experiment of 7-channel 80-Gbit/s PM-16QAM signals.
Tu.3.A.6 • 10:15 (Invited)
Optimization of 16-ary Quadrature Amplitude Modulation Constellations for Phase Noise Impaired Channels
Timo Pfau, Xiang Liu, Sethumadhavan Chandrasekhar; Bell Labs, Alcatel-Lucent, USA; Bell Labs, Alcatel-Lucent, USA.
An iterative constellation optimization algorithm is used to find new 16-ary Quadrature Amplitude Modulation (QAM) constellations. The constellations double phase noise tolerance and improve receiver sensitivity by up to 0.3 dB compared to the square 16-QAM constellation.