Title :
The influence factors and optimization methods of the local oscillator power for coherent doppler lidar
Author :
Bu, Zhichao ; Zhang, Yinchao ; Chen, Siying ; Qiu, Zongjia ; Chen, He ; Guo, Pan ; Chen, Shengzhe ; Ge, Xianying
Author_Institution :
Key Lab. of Photoelectronic Imaging Technol. & Syst., Beijing Inst. of Technol., Beijing, China
Abstract :
Coherent doppler lidar for wind is based on the heterodyne detection between local oscillator signal and the echo signal. Optimum optical local oscillator power is an important factor of the signal to noise ratio. The dynamic range of echo signal, the relative intensity noise and the photoelectric detector saturation effect are studied comprehensively as the local oscillator power influence factors for the first time. The expression of the local oscillator power and SNR is derived. Using the computer simulation, the conclusion that the dynamic range of the echo signal will not affect the optimum of the local oscillator is obtained. Selecting different values of the relative intensity noise, the curves of the SNR versus local oscillator are given. Comparing the SNR formula in the quantum limit with the derived SNR formula, the saturation effect of the photoelectric devices is studied.
Keywords :
echo; heterodyne detection; optical radar; optimisation; oscillators; coherent Doppler lidar; echo signal; heterodyne detection; influence factors; local oscillator power; local oscillator signal; optimization methods; photoelectric detector saturation effect; relative intensity noise; Laser radar; Local oscillators; Optical fiber sensors; Optical fibers; Optical mixing; Signal to noise ratio; optimum local oscillator power; range of echo signal; the relative intensity noise; the saturation effect of photoelectric detector;
Conference_Titel :
Remote Sensing, Environment and Transportation Engineering (RSETE), 2011 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-9172-8
DOI :
10.1109/RSETE.2011.5964871
