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Study on the Snr Capability Optimization of Fiber Lidar System

Author: QuZengFeng
Tutor: SunXiuDong
School: Harbin Institute of Technology
Course: Optics
Keywords: LIDAR Optical fiber Signal-to-noise ratio Coupling efficiency Mixing efficiency
CLC: TN958.98
Type: Master's thesis
Year: 2010
Downloads: 151
Quote: 0
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Abstract


Fiber laser radar has the advantages of compact structure , small size , can be applied to many of the complexities of occasions , one of the development trend of the imaging laser radar . For fiber laser radar , how to improve the detection capability is a key consideration in its development . Wherein the receiving antenna to the coupling efficiency of the optical fiber , the heterodyne mixing efficiency of the signal light and the local oscillator light in the fiber will cause a more serious impact on the detection capabilities of the fiber laser radar . First , the paper analyzes the structure of conventional fiber laser radar , in order to reduce the impact of this vibration noise , then put forward a balanced heterodyne receiver based on double photodetector . Compared to the conventional manner , in this way can effectively improve the system SNR . Secondly, the heterodyne mixing efficiency affect the SNR . Matching conditions through the analysis of the phase space , polarization match and amplitude matching the major factors that affect fiber laser radar heterodyne mixing efficiency . Calculated Misalignment of the detector output IF current polarization of the local oscillation light and signal light in the optical fiber , is presented with a polarization maintaining fiber to achieve polarization matching method ; through the analytical performance of the detector , a good local oscillator optical power determination method, and the amplitude matching . Thereafter, the study of the optical laser radar receiving antenna to the optical fiber coupler model , and select the Cassegrain telescope as a receiving antenna, the factors affecting the coupling efficiency . Calculated Cassegrain telescope to fiber coupling efficiency , the results show that the coupling efficiency will be influenced by the obscuration ratio , the receiver aperture and optical fiber mode field radius . Detailed study of a single - mode optical fiber and the optical axis , respectively, there is a lateral offset , when the axial offset of the coupling efficiency changes . The results showed that the coupling efficiency on the more sensitive to lateral offset . Finally , the use of ZEMAX optical design software , design a Cassegrain telescope and its simulation results with the aforementioned theory to calculate the results of matches .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar: institutional sub- > Optical positioning radar,laser radar
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