KEYWORDS: Modulation, Forward error correction, Receivers, Signal to noise ratio, Optical fibers, L band, Digital signal processing, Curium, Nonlinear optics, Quadrature amplitude modulation
The joint optimization of coding and modulation formats would provide significant receiver sensitivity improvement due to the increased Hamming distance of codes. By applying Arimoto-Blahut algorithm to maximize mutual information, optimized coded-modulation has been found out together with optimized bit-mapping rule. Simulated channel capacity shows that optimized coded modulation could outperform its counterparts, such as regular qaudrature-amplitude modulation, by around 0.3dB up to about 0.9 coding rate. The improvement is found to be larger in higher modulation formats. Optimal coded-8QAM modulation has been further verified in experiment, where 40Tb/s over 6787km is demonstrated by transmitting 200G per wavelength thanks to the better receiver sensitivity of optimal coded modulation.
Interchannel nonlinear impairments are one of the major limitations to the channel capacity and transmission distance in
WDM systems. It is shown that nonlinear impairments arising from cross-phase modulation between two independent
WDM channels can be compensated. Advanced digital back propagation algorithms based on advanced split step method
allow for compensating inter-channel nonlinear impairments with low complexity. With the new algorithm, the complexity
of compensating inter-channel impairments is comparable to the complexity required for intra-channel impairments.
Conference Committee Involvement (4)
Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV
10 February 2015 | San Francisco, California, United States
Next-Generation Optical Communication: Components, Sub-Systems, and Systems III
4 February 2014 | San Francisco, California, United States
Next-Generation Optical Communication: Components, Sub-Systems, and Systems II
5 February 2013 | San Francisco, California, United States
Next-Generation Optical Communication: Components, Sub-Systems, and Systems
24 January 2012 | San Francisco, California, United States
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