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Proceedings Paper

Coherent detection: n-ary PPM versus PCM
Author(s): Robert A. Cryan; Rodney T. Unwin; Alistair J. Massarella; Martin J. N. Sibley; Ian Garrett
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Paper Abstract

In this paper we present computer results at 1. 5zm comparing coherent n-ary PPM with coherent PCM. We show that for a given fibre bandwidth there is an optimum word size and this occurs when the equivocations attributed to the error sources in n-ary PPM are equal. We conclude that for moderate to high fibre bandwidths homodyne n-ary PPM should achieve an improvement in sensitivity of typically 5 dB over homodyne PSK PCM.

Paper Details

Date Published: 1 January 1991
PDF: 8 pages
Proc. SPIE 1372, Coherent Lightwave Communications: Fifth in a Series, (1 January 1991);
Show Author Affiliations
Robert A. Cryan, Huddersfield Polytechnic (United Kingdom)
Rodney T. Unwin, Huddersfield Polytechnic (United Kingdom)
Alistair J. Massarella, Huddersfield Polytechnic (United Kingdom)
Martin J. N. Sibley, Huddersfield Polytechnic (United Kingdom)
Ian Garrett, British Telecom Research Labs. (United Kingdom)

Published in SPIE Proceedings Vol. 1372:
Coherent Lightwave Communications: Fifth in a Series
Harish R. Sunak; Roger C. Steele, Editor(s)

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