Coherent detection:  n-ary PPM versus PCM

Robert A. Cryan; Rodney T. Unwin; Alistair J. Massarella; Martin J. N. Sibley; Ian Garrett

doi:10.1117/12.24909

1 January 1991 Coherent detection: n-ary PPM versus PCM

Robert A. Cryan, Rodney T. Unwin, Alistair J. Massarella, Martin J. N. Sibley, Ian Garrett

Proceedings Volume 1372, Coherent Lightwave Communications: Fifth in a Series; (1991) https://doi.org/10.1117/12.24909
Event: SPIE Microelectronic Interconnect and Integrated Processing Symposium, 1990, San Jose, United States

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.

Citation Download Citation

Robert A. Cryan, Rodney T. Unwin, Alistair J. Massarella, Martin J. N. Sibley, and Ian Garrett "Coherent detection: n-ary PPM versus PCM", Proc. SPIE 1372, Coherent Lightwave Communications: Fifth in a Series, (1 January 1991); https://doi.org/10.1117/12.24909

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