Optimized signal constellations for ultra-high-speed optical transport

Shaoliang Zhang; Tao Liu; Yequn Zhang; Fatih Yaman; Ivan B. Djordjevic; Ting Wang

doi:10.1117/12.2078512

7 February 2015 Optimized signal constellations for ultra-high-speed optical transport

Shaoliang Zhang, Tao Liu, Yequn Zhang, Fatih Yaman, Ivan B. Djordjevic, Ting Wang

Proceedings Volume 9388, Optical Metro Networks and Short-Haul Systems VII; 93880F (2015) https://doi.org/10.1117/12.2078512
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

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.

Citation Download Citation

Shaoliang Zhang, Tao Liu, Yequn Zhang, Fatih Yaman, Ivan B. Djordjevic, and Ting Wang "Optimized signal constellations for ultra-high-speed optical transport", Proc. SPIE 9388, Optical Metro Networks and Short-Haul Systems VII, 93880F (7 February 2015); https://doi.org/10.1117/12.2078512

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