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Proceedings Paper

Measurement of scintillation and link margin for the TerraLink laser communication system
Author(s): Isaac I. Kim; Joseph Koontz; Harel Hakakha; Prasanna Adhikari; Ron Stieger; Carter Moursund; Micah Barclay; Alyssa Stanford; Richard Ruigrok; John J. Schuster; Eric J. Korevaar
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Paper Abstract

AstroTerra's TerraLinkTM 8-155 laser communications equipment is designed for a clear weather range of 8 km and a data rate of 230 Mb/s, and TerraLink 4-155 is designed for a 2 km range. The TerraLink equipment achieves a reduction in scintillation-induced intensity fluctuations by using large receive apertures and multiple transmit apertures. We present measurements of received intensity fluctuations at different ranges through 4 inch and 8 inch receive apertures. We also present link margin data, with its implications for use of lasercom equipment in various weather conditions. Scintillation measurements were made while a communications link was operating by placing a second receive telescope with a PIN photodiode next to one of the lasercom transceivers. By plotting the probability of intensity vs. intensity, the necessary link margin to achieve a desired burst error rate can be calculated. At the longest ranges, the TerraLink equipment requires a scintillation fade margin of about 10 dB to achieve a 10-9 bit error rate. The equipment is designed with an additional margin of 4 - 5 dB for atmospheric attenuation.

Paper Details

Date Published: 23 January 1998
PDF: 19 pages
Proc. SPIE 3232, Wireless Technologies and Systems: Millimeter-Wave and Optical, (23 January 1998); doi: 10.1117/12.301021
Show Author Affiliations
Isaac I. Kim, AstroTerra Corp. (United States)
Joseph Koontz, AstroTerra Corp. (United States)
Harel Hakakha, AstroTerra Corp. (United States)
Prasanna Adhikari, AstroTerra Corp. (United States)
Ron Stieger, AstroTerra Corp. (United States)
Carter Moursund, AstroTerra Corp. (United States)
Micah Barclay, AstroTerra Corp. (United States)
Alyssa Stanford, AstroTerra Corp. (United States)
Richard Ruigrok, AstroTerra Corp. (United States)
John J. Schuster, AstroTerra Corp. (United States)
Eric J. Korevaar, AstroTerra Corp. (United States)

Published in SPIE Proceedings Vol. 3232:
Wireless Technologies and Systems: Millimeter-Wave and Optical
Paul Christopher; Leland Langston; G. Stephen Mecherle, Editor(s)

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