14 December 2011 Enhancement of the laser phase noise tolerance for star 16-QAM optical coherent systems
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Proceedings Volume 8309, Optical Transmission Systems, Subsystems, and Technologies IX; 83092J (2011) https://doi.org/10.1117/12.904242
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China
Abstract
An efficient bit-to-symbol mapping method for star 16-quadrature amplitude modulation (16-QAM) is proposed in this paper, which is similar to Gray coding for square 16-QAM. With the consideration of optimal ring ratio of constellation, our simulation results show that a linewidth of 3MHz per laser can be tolerated for star 16-QAM optical coherent systems with SNR penalty of 1dB at BER of 10-3, which is much better than that of square 16-QAM. Further optimization possibility with variable number of points on each of the rings for star 16-QAM constellation is also discussed.
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Jihong Liu, Jihong Liu, Gee-Kung Chang, Gee-Kung Chang, } "Enhancement of the laser phase noise tolerance for star 16-QAM optical coherent systems", Proc. SPIE 8309, Optical Transmission Systems, Subsystems, and Technologies IX, 83092J (14 December 2011); doi: 10.1117/12.904242; https://doi.org/10.1117/12.904242
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