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Proceedings Paper

Capacity of avalanche-photodiode-detected pulse position modulation
Author(s): Jon Hamkins; Juan M. Ceniceros
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Paper Abstract

The capacity is determined for an optical channel employing Pulse Position Modulation (PPM) and an Avalanche PhotoDiode (APD) detector. This channel is different from the usual optical channel in that the detector output is characterized by a Webb-plus-Gaussian distribution, not a Poison distribution. The capacity is expressed as a function of the PPM order, slot width, laser dead time, average number of incident signal and background photons received, and APD parameters. Based on a system using a laser and detector proposed for X2000 second delivery, numerical results provide upper bounds on the data rate and level of background noise that the channel can support while operating at a given BER. For the particular case studied, the capacity-maximizing PPM order is near 2048 for nighttime reception and 16 for daytime reception. Reed-Solomon codes can handle background levels 2.3 to 7.6 dB below the ultimate level that can be handled by codes operating at the Shannon limit.

Paper Details

Date Published: 2 May 2000
PDF: 12 pages
Proc. SPIE 3932, Free-Space Laser Communication Technologies XII, (2 May 2000); doi: 10.1117/12.384321
Show Author Affiliations
Jon Hamkins, Jet Propulsion Lab. (United States)
Juan M. Ceniceros, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 3932:
Free-Space Laser Communication Technologies XII
G. Stephen Mecherle, Editor(s)

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