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5 November 2010 Carrier feed-through analysis of heterodyne lidar system
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A novel heterodyne continuous wave lidar system based on single-mode fiber (SMF) components and instruments is reported. In order to improve the signal-to-noise ratio (SNR) of heterodyne lidar system, the four causes producing carrier feed-through are presented, including: (1) the return loss of optical antenna; (2) the direction of fiber circulator; (3) the extinction ratio of acousto-optic frequency shifter (AOFS); (4) close object's reflection. Then theoretical analysis and experimental study for the methods of eliminating carrier feed-through are conducted. The results demonstrate that carrier feed-through mainly arises from the non-ideality of optical components. By improving the traditional heterodyne optical structure and enhancing the performance of optical components, the carrier feed-through power can be decreased by more than 20dB.
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Jiqiang Wang, Zhiqiang Song, Chang Wang, Tongyu Liu, and Jiasheng Ni "Carrier feed-through analysis of heterodyne lidar system", Proc. SPIE 7849, Optical Design and Testing IV, 78490S (5 November 2010);

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