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Proceedings Paper

Foward error correction and its impact on high-data-rate, free-space laser communication system design
Author(s): Farhad Hemmati; Robert G. Marshalek; Dilip K. Paul
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Paper Abstract

This paper discusses the use of forward error correction (FEC) in a 300 to 1000 Mbit/s free-space optical communications link. It also considers the tradeoffs involved in applying block codes or convolutional codes, emphasizing the peak and average power limitations of GaAlAs diode laser sources. Direct-detection optical receivers are assumed throughout. The application of FEC technology to a high-data-rate optical communications system is discussed, including available coding gain, correction for both random errors and mispointing-induced burst errors, and electronic implementation difficulties. This is followed by a discussion of the major system benefits derivable from FEC. Consideration is given to using the available coding gain for reducing diode laser source power, aperture size, or fine tracking accuracy. Regarding optical system design, it is most favorable to apply the coding gain toward reducing diode laser power requirements.

Paper Details

Date Published: 1 July 1990
PDF: 12 pages
Proc. SPIE 1218, Free-Space Laser Communication Technologies II, (1 July 1990); doi: 10.1117/12.18200
Show Author Affiliations
Farhad Hemmati, COMSAT Labs. (United States)
Robert G. Marshalek, Ball Aerospace Systems Group (United States)
Dilip K. Paul, COMSAT Labs. (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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