Evaluation of free-space optical communication system in metropolitan Tokyo area

Shoji Kaneko; Kazutaka Oba; Tatsuaki Hamai

doi:10.1117/12.464101

26 April 2002 Evaluation of free-space optical communication system in metropolitan Tokyo area

Shoji Kaneko, Kazutaka Oba, Tatsuaki Hamai

Proceedings Volume 4635, Free-Space Laser Communication Technologies XIV; (2002) https://doi.org/10.1117/12.464101
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States

Abstract

The link availability of a free space communication system is affected by weather conditions such as rain, snow, and most notably fog. For carrier class services, the link availability of 99.999% is highly desired. In this paper, we will report the evaluation of atmospheric attenuation variation depending on the weather condition in metropolitan Tokyo area to obtain some network design parameters for desired link availability. For the evaluation we constructed an experimental communication network with a free space communication system. The network consists of nine free space communication devices installed at locations deferent in height. The link distance between these devices are not identical. We will show that we can estimate the attenuation of atmosphere of local links by using those communication devices. We also installed two present weather detectors (PWD) to measure attenuation in terms of visibility at two locations we installed free space communication devices. These PWD units can detect the amount and type of a precipitation allowing us to compare the attenuation caused by various weather factors. We have observed that attenuation value is considerably high starting from 150m (mean sea level) resulting in higher link outage rate compare to other low-height links.

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Shoji Kaneko, Kazutaka Oba, and Tatsuaki Hamai "Evaluation of free-space optical communication system in metropolitan Tokyo area", Proc. SPIE 4635, Free-Space Laser Communication Technologies XIV, (26 April 2002); https://doi.org/10.1117/12.464101

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KEYWORDS

Signal attenuation

Telecommunications

Free space optics

Visibility

Free space

Free space optical communications

Visibility through fog

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