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Heterodyne ladar system efficiency enhancement using single-mode optical fiber mixers

A theoretical performance analysis of a heterodyne ladar system incorporating a single-mode fiber receiver has been performed. For our purposes, the performance parameters of interest are the coupling and mixing efficiency of the ladar receiver as they relate to the overall system carrier-to-noise r...

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Bibliographic Details
Published in:Optical Engineering 1995-11, Vol.34 (11), p.3122-3129
Main Authors: Jacob, Donald K, Mark, Martin B, Duncan, Bradley D
Format: Article
Language:English
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Summary:A theoretical performance analysis of a heterodyne ladar system incorporating a single-mode fiber receiver has been performed. For our purposes, the performance parameters of interest are the coupling and mixing efficiency of the ladar receiver as they relate to the overall system carrier-to-noise ratio. For a receiver incorporating a single-mode fiber mixer, the received and local-oscillator fields are matched both spatially and temporally at the detector, yielding 100 percent mixing efficiency. We have therefore focused our efforts on determining an expression for the efficiency with which a diffuse return from a purely speckle target can be coupled into the receiving leg of a monostatic, untruncated CW ladar system. Through numerical analysis, the expected coupling efficiency for a ladar system with negligible truncation of the transmit beam has been determined to be 30.6 percent. (Author)
ISSN:0091-3286
1560-2303
DOI:10.1117/12.213594