Chinese Optics Letters, 2008, 6 (4): 261, Published Online: Apr. 21, 2008
Application of fiber interferometer in coherent Doppler lidar Download: 1062次
相干多普勒激光雷达 光纤干涉仪 耦合效率 测速 280.3340 Laser Doppler velocimetry 120.7250 Velocimetry 030.1670 Coherent optical effects 060.2430 Fibers, single-mode
Abstract
A novel coherent Doppler lidar (CDL) system based on single-mode fiber (SMF) components and instruments is presented to measure the speed of target. A fiber interferometer used in CDL system is reported. This fiber mixer is employed as a coherent receiver to resolve the shifts of signal-to-noise ratio (SNR) and mixing efficiency induced by backscattered field’s wavefront error. For a certain wavelength, the maximum coupling efficiency between signal and SMF is determined by the ratio of pupil diameter to focal length of the coupling lens. The legible interference patterns and spectrum signals show that fiber interferometer is suitable to compensate for amplitude and phase vibrations. This robust coherent receiver can achieve improved CDL system performance with less transmitter power.
Zongfeng Ma, Chunxi Zhang, Guangming Luo. Application of fiber interferometer in coherent Doppler lidar[J]. Chinese Optics Letters, 2008, 6(4): 261.