Abstract

In this paper, a 1550nm all fiber monostatic laser range finder system based on linear chirp modulation and heterodyne detection is presented. The fiber end face signal is used as a range starting indicator. The transmitted laser power is 5mW with a laser pulse length of 131μs and a linear chirp bandwidth of 40MHz. The telescope with an aperture of 3cm couples the return light into a single mode fiber. Better than 14cm distance accuracy and 26dB SNR can be achieved for a wood target at a distance of about 43m by using the above system setup. Several experiments with different system parameters are conducted. The system performance is tested under variable laser pulse length, linear chirp bandwidth, local oscillator power, and background noise. Finally, an application of the linear chirp modulation heterodyne laser range finder in a spaceborne ranging system is proposed.

© 2009 Optical Society of America

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