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Conferences > ACP > 2011 > PDP > 83092J

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

Jihong Liu and Gee-Kung Chang

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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.

© 2011 Optical Society of America

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