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Proceedings Paper

Pulse position modulation/demodulation with picosecond slot widths
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Paper Abstract

Pulse position modulation (PPM) is the preferred signaling format for deep space optical communications. Its high peak to average power ratio easily supports efficient forward error correction codes that operate within one dB of capacity at efficiencies better than one bit per detected photon when using photon counting detectors. Sub-100 picosecond slot widths are desired for efficient gigabit/second data links, but slot widths are limited by the jitter of available single photon detectors and laser modulators. Presently, the slot width must be larger than the receiver detector jitter and the transmitter modulator transition times. We show techniques whereby the slot time can be reduced, such that the jitter limitation is no longer the slot width but rather the PPM symbol duration.

Paper Details

Date Published: 13 February 2008
PDF: 8 pages
Proc. SPIE 6877, Free-Space Laser Communication Technologies XX, 68770K (13 February 2008); doi: 10.1117/12.763932
Show Author Affiliations
Kevin M. Birnbaum, Jet Propulsion Lab. (United States)
William H. Farr, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 6877:
Free-Space Laser Communication Technologies XX
Steve Mecherle, Editor(s)

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