1 December 1994 Optical-fiber preamplifiers for ladar detection and associated measurements for improving the signal-to-noise ratio
Author Affiliations +
Optical Engineering, 33(12), (1994). doi:10.1117/12.183406
Abstract
In an effort to increase achievable postdetection signal-to-noise ratios (SNRs) of continuous-wave, 1-μm all-solid-state ladar systems, a prototype rare-earth-doped optical-fiber amplifier has been included in the optical return signal path of both a heterodyne and a direct-detection ladar system. We provide numerical predictions for SNR increases according to our previously developed theory. We also detail our experimental efforts and provide the results of SNR measurements for four distinct cases: direct ladar detection with and without a fiber amplifier, and heterodyne ladar detection with and without a fiber amplifier. Experimentally measured increases in SNRs for ladar systems incorporating an optical-fiber amplifier are then compared with our earlier predictions. Specifically, we have found that for direct detection with a fiber amplifier in place, the predicted SNR increase is 42.0 dB, and we have measured an increase of 36.5 dB. Similarly, for heterodyne ladar detection with a fiber amplifier, the predicted SNR increase is 3.8 dB, and we have measured an increase of 8.0 dB.
Michael S. Salisbury, Paul F. McManamon, Bradley D. Duncan, "Optical-fiber preamplifiers for ladar detection and associated measurements for improving the signal-to-noise ratio," Optical Engineering 33(12), (1 December 1994). http://dx.doi.org/10.1117/12.183406
JOURNAL ARTICLE
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KEYWORDS
Signal to noise ratio

Fiber amplifiers

Heterodyning

LIDAR

Signal detection

Optical amplifiers

Sensors

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