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Characterization of Gigabit Ethernet Over Highly Turbulent Optical Wireless Links.

DE200515013336

Publication Date	2002
Personal Author	Johnson, G. W.; Cornish, J. P.; Wilburn, J. W.; Young, R. A.; Ruggiero, A. J.
Page Count	14
Abstract	We report on the performance characterization and issues associated with using Gigabit Ethernet (GigE) over a highly turbulent (C(sup 2)(sub n) > 10(sup-12)) 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 singlemode fiber-coupled, 1550 nm, WDM air-optic transceiver. TCPAP 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.
Keywords	Ethernet Gigabit Optical communication WDM Free space optics SATRN(Secure Air-optic Transport and Routing Network)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200601

Characterization of Gigabit Ethernet Over Highly Turbulent Optical Wireless Links.

Characterization of Gigabit Ethernet Over Highly Turbulent Optical Wireless Links.
DE200515013336

Publication Date	2002
Personal Author	Johnson, G. W.; Cornish, J. P.; Wilburn, J. W.; Young, R. A.; Ruggiero, A. J.
Page Count	14
Abstract	We report on the performance characterization and issues associated with using Gigabit Ethernet (GigE) over a highly turbulent (C(sup 2)(sub n) > 10(sup-12)) 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 singlemode fiber-coupled, 1550 nm, WDM air-optic transceiver. TCPAP 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.
Keywords	Ethernet Gigabit Optical communication WDM Free space optics SATRN(Secure Air-optic Transport and Routing Network)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200601