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Proceedings Article

Measurement of scintillation and link margin for the TerraLink laser communication system

[+] Author Affiliations
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

AstroTerra Corp. (USA)

Proc. SPIE 3232, Wireless Technologies and Systems: Millimeter-Wave and Optical, 100 (January 23, 1998); doi:10.1117/12.301021
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From Conference Volume 3232

  • Wireless Technologies and Systems: Millimeter-Wave and Optical
  • Paul Christopher; Leland Langston; G. Stephen Mecherle
  • Dallas, TX | November 02, 1997

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.

© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Isaac I. Kim ; Joseph Koontz ; Harel Hakakha ; Prasanna Adhikari ; Ron Stieger, et al.
"Measurement of scintillation and link margin for the TerraLink laser communication system", Proc. SPIE 3232, Wireless Technologies and Systems: Millimeter-Wave and Optical, 100 (January 23, 1998); doi:10.1117/12.301021; http://dx.doi.org/10.1117/12.301021


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