Carrier phase recovery for 16-QAM using QPSK partitioning and sliding window averaging

被引：24

作者：

机构：

[1] National Physical Laboratory

[2] Optical Networks Group, Department of Electronic and Electrical Engineering, University College London

来源：

| 1600年 / Institute of Electrical and Electronics Engineers Inc., United States卷 / 26期

关键词：

Carrier phase recovery; QPSK partitioning; quadrature amplitude modulation (QAM);

D O I：

10.1109/LPT.2014.2306001

中图分类号：

学科分类号：

摘要：

This letter presents the carrier phase recovery for 16-ary quadrature amplitude modulation (16-QAM) optical coherent systems using the quaternary phase-shift keying (QPSK) partitioning with sliding window averaging and differential decoding. We assess the increase in linewidth tolerance achievable with sliding window averaging as opposed to block averaging. Simulation results demonstrate that combined linewidth symbol duration product, Δv·Ts, of 10-4 is tolerable at the target bit error ratio (BER) of 10-2 and 10-3 for a penalty of 0.6 and 0.8 dB, respectively, compared with the theoretical limit with differential decoding. The impact of analog-to-digital converter (ADC) resolution on the performance of the QPSK partitioning algorithm is also investigated. Finally, the performance of the algorithm using the measured phase noise for a distributed feedback (DFB) laser is presented for different values of Δv·Ts. We show that for Δv·T s>10-4 , the penalty of block averaging is >0.5dB with respect to sliding window averaging at the target BER of 10-3 with the measured phase noise. The degradation associated with block averaging at the target BER of 10-2 is shown to be less significant compared to sliding window averaging. © 1989-2012 IEEE.

引用

页码：854 / 857

页数：3

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