Enhancement of the laser phase noise tolerance for star 16-QAM optical coherent systems

Jihong Liu; Gee-Kung Chang

doi:10.1117/12.904242

14 December 2011 Enhancement of the laser phase noise tolerance for star 16-QAM optical coherent systems

Jihong Liu, Gee-Kung Chang

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.

Citation Download Citation

Jihong Liu and 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); https://doi.org/10.1117/12.904242

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