Forward error correction and its impact on high-data-rate, free-space laser communication system design

Details Forward error correction and its impact on high-data-rate, free-space laser communication system design Forward error correction and its impact on high-data-rate, free-space laser communication system design

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1218..336h&link_type=abstract

IN: Free-space laser communication technologies II; Proceedings of the Meeting, Los Angeles, CA, Jan. 15-17, 1990 (A91-22776 08-

Physics

Error Correcting Devices, Optical Communication, Space Communication, Spaceborne Lasers, Data Transmission, Optical Tracking

Scientific paper

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.

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