An improved multiplier-free feed-forward carrier phase estimation for dual-polarization QPSK modulation format

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2013,（4）
• 页码范围: 305-308
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11801-013-3036-0

摘要

An improved multiplier-free feed-forward carrier phase estimation algorithm is proposed for dual-polarization quadrature-phase-shift-keying (DP-QPSK) with coherent detection.The bit error rate (BER) performance,block length effect and linewidth tolerance of the proposed algorithm are evaluated for a 112 Gbit/s DP-QPSK system.A linewidth symbol duration product of 2.9× 10-4 is demonstrated for 1 dB optical signal-to-noise-ratio (OSNR) penalty at BER of 10-3 for the proposed algorithm.The hardware complexity of the proposed multiplier-free algorithm is demonstrated to be much lower than that of the 4th power algorithm.