A postdetection strategy for the reduction of error floors of optical DPSK receivers impaired by laser phase noise

被引:2
作者
Kiasaleh, K [1 ]
机构
[1] Univ Texas, Erik Jonsson Sch Engn & Comp Sci, Richardson, TX 75083 USA
关键词
differential-detection; differential phase shift; keying (DPSK); postdetection; phase noise;
D O I
10.1109/50.744215
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A postdetection strategy for the performance enhancement of optical binary differential phase shift keying (DPSK) receivers impaired by phase noise is proposed and investigated. First, the bandwidth of integrate-and-dump (I&D) filters is increased so that multiple samples per symbol duration of the received signal are obtained. Previously, a scheme, hereafter referred to as fixed-window (FW) postdetection processing, was introduced [1]. In this approach, the samples separated in time by a symbol time at the output of I&D filters are correlated. The decision circuitry, subsequently, provides a sum of the resulting signal over a symbol time to yield a decision variable. In the proposed scheme here, hereafter referred to as symmetrical expanding window (S-EW) postdetection processing scheme, samples that are centered about the signal transition point in a two-symbol signaling interval are correlated. Numerical results indicate that the S-EW scheme achieves an error floor that is significantly smaller than that of the its FW counterpart.
引用
收藏
页码:165 / 170
页数:6
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