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Proceedings Paper

Optical noise in a coherent lidar
Author(s): Yitzhak Weissman
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Paper Abstract

Optical coherent LIDARs are used for remote sensing in both atmospheric and space environments. These systems offer higher angular resolution with significantly more compact components as compared to the alternative microwave-based systems. One of the factors which limits the range of coherent LIDARs is the coherence length of the source. It is well known that the signal in a coherent LIDAR system undergoes a significant decay over a range comparable to the source coherence length. An often overlooked fact is the range-associated increase of the optical noise. In this paper we present the spectral power density of the optical noise in a heterodyne LIDAR system, and explore its dependence on the range and the local oscillator power. The magnitude of the optical noise increases with range, thus accelerating the signal-to-noise degradation. Another interesting observation is that in general, the signal- to-noise ratio is not a monotonically increasing function of the local oscillator power.

Paper Details

Date Published: 13 August 1993
PDF: 8 pages
Proc. SPIE 1971, 8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing, (13 August 1993); doi: 10.1117/12.150995
Show Author Affiliations
Yitzhak Weissman, Soreq Noclear Research Ctr. (Israel)

Published in SPIE Proceedings Vol. 1971:
8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing
Moshe Oron; Itzhak Shladov; Yitzhak Weissman, Editor(s)

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