On Divergence-Angle Efficiency of a Laser Beam in Free-Space Optical Communications for High-Speed Trains

Document Type

Article

Publication Date

9-1-2017

Abstract

We compare narrow and wide laser beams in a free-space optical (FSO) communications system for high-speed train communications and analyze the tradeoffs among the received power, coverage area, and the complexity of the acquisition-tracking-pointing (ATP) mechanism. We propose to employ a divergence angle of a wide beam in the range [0.07, 2.002] to relax the steering speed of the fast steering mirror, which is a major component of the ATP mechanism in an FSO transceiver. In addition, we overcome the negative effects of train vibrations by using a proposed divergence-angle range for a wide beam. The proposed range of divergence angles provides a large link range and effective coverage length, and contact time as compared to a narrow beam.

Identifier

85029951833 (Scopus)

Publication Title

IEEE Transactions on Vehicular Technology

External Full Text Location

https://doi.org/10.1109/TVT.2017.2686818

ISSN

00189545

First Page

7677

Last Page

7687

Issue

9

Volume

66

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