Characterization of gigabit ethernet over highly turbulent optical wireless links

Gary W. Johnson; John P. Cornish; Jeffrey W. Wilburn; Richard A. Young; Anthony J. Ruggiero

doi:10.1117/12.450644

9 December 2002 Characterization of gigabit ethernet over highly turbulent optical wireless links

Gary W. Johnson, John P. Cornish, Jeffrey W. Wilburn, Richard A. Young, Anthony J. Ruggiero

Proceedings Volume 4821, Free-Space Laser Communication and Laser Imaging II; (2002) https://doi.org/10.1117/12.450644
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

Citation Download Citation

Gary W. Johnson, John P. Cornish, Jeffrey W. Wilburn, Richard A. Young, and Anthony J. Ruggiero "Characterization of gigabit ethernet over highly turbulent optical wireless links", Proc. SPIE 4821, Free-Space Laser Communication and Laser Imaging II, (9 December 2002); https://doi.org/10.1117/12.450644

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