A COMPARISON OF COHERENT DIGITAL PPM WITH PCM

被引：4

作者：

CRYAN, RA

UNWIN, RT

MASSARELLA, AJ

SIBLEY, MJN

GARRETT, I

机构：

[1] HUDDERSFIELD POLYTECH,SCH ENGN,ELECTR & COMMUN GRP,HUDDERSFIELD HD1 3DH,W YORKSHIRE,ENGLAND

[2] BRITISH TELECOMMUN PLC,IPSWICH IP5 7RE,SUFFOLK,ENGLAND

来源：

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS | 1992年 / 3卷 / 04期

关键词：

D O I：

10.1002/ett.4460030405

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

Digital pulse position modulation (PPM) is a preferred modulation format for the ideal photon counting channel and optical intersatellite links. Here we examine its potential for the coherent optical fibre communications channel. We present a thorough performance and optimisation analysis. Comparisons, at a wavelength of 1.5-mu-m, are made with shot-noise limited coherent PCM (homodyne and heterodyne ASK, FSK and PSK) over a range of fibre bandwidths and varying PPM word size. We conclude that for moderate to high fibre bandwidths homodyne digital PPM should achieve an improvement in sensitivity of typically 5 dB over homodyne PSK PCM.

引用

页码：331 / 340

页数：10

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