Title

Coherent Optical Array Receivers For The Mitigation Of Atmospheric Turbulence And Speckle Effects

Keywords

Atmospheric turbulence compensation; Coherent optical array receivers; Coherent optical communications; Electro-optic phase-locked loop; Heterodyne arrays; Space diversity receivers

Abstract

A description is given of the design, operation, and test over a 2-km path (roundtrip) of a continuous wave, coherent laser array receiver that uses two independent aperture–receivers whose intermediate frequencies are electro-optically co-phased in real time and then added as a proposed way to overcome effective aperture limitations imposed by atmospheric turbulence and to mitigate signal fading associated with atmospheric turbulence and speckle effects. The experiment resulted in a mean carrier-to-noise ratio increase of 1.8, which is within 1% of the theoretical predictions, when the two signals were phase locked, versus no increase without phase locking. Further, the carrier fading strength, or normalized carrierto- noise ratio variance, was reduced by a factor of 0.53, which is within 2% of the theoretical prediction. The bandwidth of the electro-optic phase-locked loop was measured to be of the order of 600 Hz, which is adequate to compensate for atmospheric refractive turbulence fluctuations. © 1996 Optical Society of America.

Publication Date

10-20-1996

Publication Title

Applied Optics

Volume

35

Issue

30

Number of Pages

5999-6009

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/AO.35.005999

Socpus ID

0000298117 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0000298117

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