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Optical Engineering

Analysis on error of laser frequency locking for fiber optical receiver in direct detection wind lidar based on Fabry–Perot interferometer and improvements
Author(s): Feifei Zhang; Xiankang Dou; Dongsong Sun; Zhifeng Shu; Haiyun Xia; Yuanyuan Gao; Dongdong Hu; Mingjia Shangguan
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Paper Abstract

Direct detection Doppler wind lidar (DWL) has been demonstrated for its capability of atmospheric wind detection ranging from the troposphere to stratosphere with high temporal and spatial resolution. We design and describe a fiber-based optical receiver for direct detection DWL. Then the locking error of the relative laser frequency is analyzed and the dependent variables turn out to be the relative error of the calibrated constant and the slope of the transmission function. For high accuracy measurement of the calibrated constant for a fiber-based system, an integrating sphere is employed for its uniform scattering. What is more, the feature of temporally widening the pulse laser allows more samples be acquired for the analog-to-digital card of the same sampling rate. The result shows a relative error of 0.7% for a calibrated constant. For the latter, a new improved locking filter for a Fabry–Perot Interferometer was considered and designed with a larger slope. With these two strategies, the locking error for the relative laser frequency is calculated to be about 3 MHz, which is equivalent to a radial velocity of about 0.53  m/s and demonstrates the effective improvements of frequency locking for a robust DWL.

Paper Details

Date Published: 2 December 2014
PDF: 8 pages
Opt. Eng. 53(12) 124102 doi: 10.1117/1.OE.53.12.124102
Published in: Optical Engineering Volume 53, Issue 12
Show Author Affiliations
Feifei Zhang, Univ. of Science and Technology of China (China)
Xiankang Dou, Univ. of Science and Technology of China (China)
Dongsong Sun, Univ. of Science and Technology of China (China)
Zhifeng Shu, Univ. of Science and Technology of China (China)
Haiyun Xia, Univ. of Science and Technology of China (China)
Yuanyuan Gao, Univ. of Science and Technology of China (China)
Dongdong Hu, Univ. of Science and Technology of China (China)
Mingjia Shangguan, Univ. of Science and Technology of China (China)


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