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Proceedings Paper

FMCW laser range-finder with an avalanche photodiode working as an optoelectronic mixer
Author(s): David Dupuy; Marc Lescure; Helene Tap-Beteille
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Paper Abstract

A Frequency Modulation Continuous Wave (FMCW) laser range- finder has been designed for distances from 1 m to 20 m with cooperative or diffusing targets. This range-finder is compared to a phase shift laser range-finder. A heterodyne photoreception method is studied. In order to reduce noise, the nonlinear current-voltage characteristic of the APD is used to obtain an optoelectronic mixer. The photocurrent gain is modulated by the VCO signal working as a local oscillator (LO). The optical and electrical LO injection methods are studied. The theoretical analysis using the Miller model and thermal effects are compared with the first experimental results. The electrical LO injection gives a better ratio-to-noise than the optical LO injection. For electrical injection, it is shown that the heterodyne conversion gain can reach the maximal theoretical value 0.5.

Paper Details

Date Published: 23 January 2002
PDF: 10 pages
Proc. SPIE 4546, Laser Radar: Ranging and Atmospheric Lidar Techniques III, (23 January 2002); doi: 10.1117/12.453982
Show Author Affiliations
David Dupuy, Institut National Polytechnique de Toulouse/ENSEEIHT (France)
Marc Lescure, Institut National Polytechnique de Toulouse/ENSEEIHT (France)
Helene Tap-Beteille, Institut National Polytechnique de Toulouse/ENSEEIHT (France)

Published in SPIE Proceedings Vol. 4546:
Laser Radar: Ranging and Atmospheric Lidar Techniques III
Ulrich Schreiber; Christian Werner; Gary W. Kamerman; Upendra N. Singh, Editor(s)

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