Abstract

We discuss the use of a coherent digital receiver for the compensation of linear transmission impairments and polarization demultiplexing in a transmission system compatible with a future 100-Gb/s Ethernet standard. We present experimental results on the transmission performance of 111 Gbit/s POLMUX-RZ-DQPSK. For a dense WDM setup with channels carrying 111 Gbit/s with a 50 GHz channel spacing (2.0 bits/s/Hz), we show the feasibility of 2375 km transmission. This is enabled through coherent detection which results in excellent noise performance, and subsequent electronic equalization which provides the high tolerance to polarization mode dispersion and chromatic dispersion (CD). Furthermore, we discuss the impact of sampling and digital signal processing with either 1 or 2 samples/bit. We show that when combined with low-pass electrical filtering, 1sample/bit signal processing is sufficient to obtain a large tolerance towards CD. The proposed modulation and detection techniques enable 111 Gbit/s transmission that is directly compatible with the existing 10 Gbit/s infrastructure.

© 2007 IEEE

All-Digital Timing Recovery and Adaptive Equalization for 112 Gbit∕s POLMUX-NRZ-DQPSK Optical Coherent Receivers

Xian Zhou, Xue Chen, Weiqing Zhou, Yangyang Fan, Hai Zhu, and Zhiyu Li
J. Opt. Commun. Netw. 2(11) 984-990 (2010)

Impact of time-interleaving on directly-detected 100-Gb/s POLMUX RZ-DQPSK robustness to PDL-induced crosstalk

P. Boffi, M. Ferrario, L. Marazzi, P. Martelli, P. Parolari, R. Siano, and M. Martinelli
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Measurement of PMD tolerance in 40-Gb/s polarization-multiplexed RZ-DQPSK

Pierpaolo Boffi, Maddalena Ferrario, Lucia Marazzi, Paolo Martelli, Paola Parolari, Aldo Righetti, Rocco Siano, and Mario Martinelli
Opt. Express 16(17) 13398-13404 (2008)

Parallel implementation of all-digital timing recovery for high-speed and real-time optical coherent receivers

Xian Zhou and Xue Chen
Opt. Express 19(10) 9282-9295 (2011)

A self-coherent receiver for detection of
PolMUX coherent signals

Jingshi Li, Rene Schmogrow, David Hillerkuss, Philipp C. Schindler, Moshe Nazarathy, Carsten Schmidt-Langhorst, Shalva-Ben Ezra, Igor Tselniker, Christian Koos, Wolfgang Freude, and Juerg Leuthold
Opt. Express 20(19) 21413-21433 (2012)