Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1994-12-27
1996-11-12
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 285, 359122, 359156, 359192, G01C 308, G01P 336, H04B 1000
Patent
active
055745539
ABSTRACT:
To greatly increase the sensitivity of a Heterodyne Ladar System, the receiver incorporates an optical preamplifier to amplify the ladar return signal prior to detection. This results in an increase in return signal power on the order of 25 dB. Spontaneous emission noise added by the fiber amplifier counters this gain in a normal scheme. The proposed receiver, however, incorporates a Polarization Optical Mixer to perform balanced mixing, thus rejecting added spontaneous emission beat noise terms and resulting in a large increase in system sensitivity.
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M. Salisbury et al, "Sensitivity Improvement of a 1-.mu.m Ladar System Incorporating an Optical Fiber Preamplifier", Optical Engineering, Nov. 1993, vol. 32, No. 11, pp. 2671-2680.
M. Salisbury et al, "Optical-Fiber Preamplifiers for Ladar Detection and Associated Measurements for Improving the Signal-to-Noise Ratio", Optical Engineering, Dec. 1994, vol. 33, No. 12.
G. Sharp, "Optical Processors for Lidar Applications", Final Technical Report for DOD Contract F33615-89-C-1125, Avionics Laboratory, Wright Research and Development Center, Wright-Patterson AFB 0H, Jul. 31, 1990.
McManamon Paul F.
Salisbury Michael S.
Serati Steven A.
Sharp Gary D.
Buczinski Stephen C.
Franz Bernard E.
Kundert Thomas L.
The United States of America as represented by the Secretary of
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