Adaptive frequency-domain equalization in digital coherent optical receivers

被引：114

作者：

Faruk, Md. Saifuddin ^{[1
]}

Kikuchi, Kazuro ^{[1
]}

机构：

[1] Univ Tokyo, Dept Elect Engn & Informat Syst, Bunkyo Ku, Tokyo 1138656, Japan

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 13期

关键词：

CARRIER PHASE ESTIMATION; TRANSMISSION; SYSTEMS; FILTERS;

D O I：

10.1364/OE.19.012789

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose a novel frequency-domain adaptive equalizer in digital coherent optical receivers, which can reduce computational complexity of the conventional time-domain adaptive equalizer based on finite-impulse-response (FIR) filters. The proposed equalizer can operate on the input sequence sampled by free-running analog-to-digital converters (ADCs) at the rate of two samples per symbol; therefore, the arbitrary initial sampling phase of ADCs can be adjusted so that the best symbol-spaced sequence is produced. The equalizer can also be configured in the butterfly structure, which enables demultiplexing of polarization tributaries apart from equalization of linear transmission impairments. The performance of the proposed equalization scheme is verified by 40-Gbits/s dual-polarization quadrature phase-shift keying (QPSK) transmission experiments. (C)2011 Optical Society of America

引用

页码：12789 / 12798

页数：10

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