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Alignment and performance analysis of free-space optical communications for broadband video transmission

Martin Holahan, Thomas Plunkett, Harlem Satterfield, Dominic Allizzo, Jazmine Branford, and John Suarez

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Abstract

We describe a free-space optical communications system operating with an externally modulated infrared carrier signal at 1550 nm. The purpose of the system is to explore an alternative to radio-frequency wireless communications, which are subject to spectral congestion and bandwidth limitations. We provide details of the optical alignment procedure and a means for extrapolating the obtained results to larger transmission distances. To illustrate the versatility of the system, a relatively wideband signal was chosen for transmission: an NTSC analog video signal, whose instantaneous bandwidth was 6 MHz. We describe the performance of the system by examining its output image quality and signal-to-noise ratio.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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