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Proceedings Paper

Eye-safe lidar receiver using Er3+: fiber optical preamplifier
Author(s): Hsian Pei Chou; Richard S. Eng; F. Cook; Victor H. Hasson
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Paper Abstract

We have demonstrated a 15 dB lidar receiver detection sensitivity improvement by employing an Er3+-doped fiber preamplifier as the input to an InGaAs P-I-N photodiode. This eye-safe, 1550 nm detection system can significantly improve lidar system performance. It is shown that it is comparatively easier at 1550 nm than at 1064 nm to achieve a higher detection sensitivity for a lidar system using a fiber preamplifier in comparison with that using an avalanche photodiode (APD). The reason is that the Er:fiber preamplifier performs better than a Nd:fiber preamplifier, while the InGaAs APD is less sensitive in comparison with a Si APD. In a lidar receiver using a fiber preamplifier, the beam coupling efficiency from free-space mode to a single- mode fiber is the critical parameter. For moderate target velocities, an automatic front-end alignment system using piezoelectric transducers can be effected to yield a good coupling efficiency. The design and preliminary test results of such a lidar receiver are discussed in terms of optimized optical filter bandwidth, optical preamplifier gain and noise figure, and input saturation level.

Paper Details

Date Published: 10 January 1997
PDF: 10 pages
Proc. SPIE 3000, Laser Diode and LED Applications III, (10 January 1997); doi: 10.1117/12.263501
Show Author Affiliations
Hsian Pei Chou, Textron (United States)
Richard S. Eng, Textron (United States)
F. Cook, Textron (United States)
Victor H. Hasson, Textron (United States)

Published in SPIE Proceedings Vol. 3000:
Laser Diode and LED Applications III
Kurt J. Linden, Editor(s)

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