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Proceedings Paper

50-Mbps free-space direct detection laser diode optical communication system with Q=4PPM signaling
Author(s): Xiaoli Sun; Frederic M. Davidson; Christopher T. Field
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Paper Abstract

A 50 Mbps direct detection optical communication system for use in an intersatellite link was constructed with an AlGaAs laser diode transmitter and a silicon avalanche photodiode photodetector. The system used a Q = 4 PPM format. The receiver consisted of a maximum likelihood PPM detector and a timing recovery subsystem. The PPM slot clock was recovered at the receiver by using a transition detector followed by a PLL. The PPM word clock was recovered by using a second PLL whose input was derived from the presence of back-to-back PPM pulses contained in the received random PPM pulse sequences. The system achieved a bit error rate of 0.000001 at less than 50 detected signal photons/information bit. The receiver was capable of acquiring and maintaining slot and word synchronization for received signal levels greater than 20 photons/information bit, at which the receiver bit error rate was about 0.01.

Paper Details

Date Published: 1 July 1990
PDF: 11 pages
Proc. SPIE 1218, Free-Space Laser Communication Technologies II, (1 July 1990); doi: 10.1117/12.18204
Show Author Affiliations
Xiaoli Sun, Johns Hopkins Univ. (United States)
Frederic M. Davidson, Johns Hopkins Univ. (United States)
Christopher T. Field, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 1218:
Free-Space Laser Communication Technologies II
David L. Begley; Bernard D. Seery, Editor(s)

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