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Proceedings Paper

Characterization of gigabit ethernet over highly turbulent optical wireless links
Author(s): Gary W. Johnson; John P. Cornish; Jeffrey W. Wilburn; Richard A. Young; Anthony J. Ruggiero
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Paper Abstract

We report on the performance characterization and issues associated with using Gigabit Ethernet (GigE) over a highly turbulent 1.3 km air-optic lasercom links. Commercial GigE hardware is a cost-effective and scalable physical layer standard that can be applied to air-optic communications. We demonstrate a simple GigE hardware interface to a single-mode fiber-coupled, 1550 nm, WDM air-optic transceiver. TCP/IP serves as a robust and universal foundation protocol that has some tolerance of data loss due to atmospheric fading. Challenges include establishing and maintaining a connection with acceptable throughput under poor propagation conditions. The most useful link performance diagnostic is shown to be scintillation index, where a value of 0.2 is the maximum permissible for adequate GigE throughput. Maximum GigE throughput observed was 49.7% of that obtained with a fiber jumper when scintillation index is 0.1. Shortcomings in conventional measurements such as bit error rate are apparent. Prospects for forward error correction and other link enhancements will be discussed.

Paper Details

Date Published: 9 December 2002
PDF: 8 pages
Proc. SPIE 4821, Free-Space Laser Communication and Laser Imaging II, (9 December 2002); doi: 10.1117/12.450644
Show Author Affiliations
Gary W. Johnson, Lawrence Livermore National Lab. (United States)
John P. Cornish, Lawrence Livermore National Lab. (United States)
Jeffrey W. Wilburn, Lawrence Livermore National Lab. (United States)
Richard A. Young, Lawrence Livermore National Lab. (United States)
Anthony J. Ruggiero, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 4821:
Free-Space Laser Communication and Laser Imaging II
Jennifer C. Ricklin; David G. Voelz, Editor(s)

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