A comparison of coherent digital PPM with PCM

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

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Digital pulse position modulation (PPM) is a preferred modulation format for the ideal photon counting channel and optical intersateilite 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 μm, are made with shot‐noise limited coherent PCM (homodyne and heterodyne ASK, FSK and PSK) over a range of fibre band‐widths 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 homo‐dyne PSK PCM.

Original languageEnglish
Pages (from-to)331-340
Number of pages10
JournalEuropean Transactions on Telecommunications
Volume3
Issue number4
DOIs
Publication statusPublished - 1 Jul 1992

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Pulse position modulation
Pulse code modulation
Phase shift keying
Bandwidth
Optical fiber communication
Frequency shift keying
Optical links
Fibers
Photons
Modulation
Wavelength

Cite this

Cryan, R. A., Unwin, R. T., Massarella, A. J., Sibley, M. J. N., & Garrett, I. (1992). A comparison of coherent digital PPM with PCM. European Transactions on Telecommunications, 3(4), 331-340. https://doi.org/10.1002/ett.4460030405
Cryan, Robert A. ; Unwin, Rodney T. ; Massarella, Alistair J. ; Sibley, Martin J.N. ; Garrett, Ian. / A comparison of coherent digital PPM with PCM. In: European Transactions on Telecommunications. 1992 ; Vol. 3, No. 4. pp. 331-340.
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Cryan, RA, Unwin, RT, Massarella, AJ, Sibley, MJN & Garrett, I 1992, 'A comparison of coherent digital PPM with PCM', European Transactions on Telecommunications, vol. 3, no. 4, pp. 331-340. https://doi.org/10.1002/ett.4460030405

A comparison of coherent digital PPM with PCM. / Cryan, Robert A.; Unwin, Rodney T.; Massarella, Alistair J.; Sibley, Martin J.N.; Garrett, Ian.

In: European Transactions on Telecommunications, Vol. 3, No. 4, 01.07.1992, p. 331-340.

Research output: Contribution to journalArticle

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Cryan RA, Unwin RT, Massarella AJ, Sibley MJN, Garrett I. A comparison of coherent digital PPM with PCM. European Transactions on Telecommunications. 1992 Jul 1;3(4):331-340. https://doi.org/10.1002/ett.4460030405