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Laser Linewidth Tolerance of Coherent Optical 64QAM and 16PSK Systems using Decision-Aided Maximum Likelihood Phase Estimation

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Abstract

The exact bit-error rate of 64-quadrature amplitude modulation (64QAM) is derived. By using decision-aided maximum likelihood phase estimation, it is found that 64QAM has almost the same laser linewidth tolerance as 16-phase-shift keying.

© 2011 Optical Society of America

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