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Impact of Sinusoidal Tones on Parallel Decision-Directed Phase Recovery for 64-QAM

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5 Author(s)
Wing-Chau Ng ; Electr. & Comput. Eng. Dept., Univ. Laval, Quebec City, QC, Canada ; Nguyen, A.T. ; Ayotte, S. ; Chul-Soo Park
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Coherent optical communications at Gbaud rates require parallelization in digital signal processing, however the feedback delay introduced by pipelining challenges phase recovery. Parallelized phase recovery creates a greater sensitivity to residual frequency offset induced by the presence of sinusoidal tones in the source. We experimentally investigate the impact of sinusoidal laser phase noise on parallel decision-directed phase recovery in a 5 Gb 64-quadrature amplitude modulation system, including the effects of frequency offset compensation and equalization.

Published in:

Photonics Technology Letters, IEEE  (Volume:26 ,  Issue: 5 )