Abstract
A simplified homodyne detection scheme for linear FM modulated lidar is presented in
which pulse dechirping is performed in the optical domain. This method provides quantum
limited detection sensitivity with much less receiver complexity compared to heterodyne
detection systems. Another advantage of this approach is the reduced bandwidth requirement for
the photodetector. This removes the limit on the chirp bandwidth, and enables the use of more
efficient photodiodes with larger detector area. A field trial using a 5-in aperture diameter
commercial telescope and a 370-m target range verified the sensitivity estimation and
demonstrated the feasibility of this technique.
© 2009 IEEE
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