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Proceedings Paper

Carrier feed-through analysis of heterodyne lidar system
Author(s): Jiqiang Wang; Zhiqiang Song; Chang Wang; Tongyu Liu; Jiasheng Ni
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Paper Abstract

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.

Paper Details

Date Published: 5 November 2010
PDF: 6 pages
Proc. SPIE 7849, Optical Design and Testing IV, 78490S (5 November 2010); doi: 10.1117/12.869902
Show Author Affiliations
Jiqiang Wang, Shandong Key Lab. of Optical Fiber Sensing Technology (China)
Laser Research Institute of Shandong Academy of Sciences (China)
Zhiqiang Song, Shandong Key Lab. of Optical Fiber Sensing Technology (China)
Laser Research Institute of Shandong Academy of Sciences (China)
Chang Wang, Shandong Key Lab. of Optical Fiber Sensing Technology (China)
Laser Research Institute of Shandong Academy of Sciences (China)
Tongyu Liu, Shandong Key Lab. of Optical Fiber Sensing Technology (China)
Laser Research Institute of Shandong Academy of Sciences (China)
Jiasheng Ni, Shandong Key Lab. of Optical Fiber Sensing Technology (China)
Laser Research Institute of Shandong Academy of Sciences (China)


Published in SPIE Proceedings Vol. 7849:
Optical Design and Testing IV
Yongtian Wang; Julie Bentley; Chunlei Du; Kimio Tatsuno; Hendrik P. Urbach, Editor(s)

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