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Discussion and experimental verification of defocus amount and field of view in laser communication
Author(s): Yan An; Yiyun Xu; Keyan Dong; Liang Gao; Yan Xie
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Paper Abstract

The change of field of view (FOV) which is caused by the image defocus of laser communication terminal introduced in the process of assembly will have a great interference to the link energy budget. In view of the problem, the method of measuring the FOV is proposed to calculate the defocus amount of receiving system. On the premise of the sensitivity of the detector is satisfied by the received energy, the relationship among the defocus receiving energy, defocus amount and FOV are derived by the theoretical analysis and calculation. With the link distance is 1km, the defocus amount of 0.27mm is calculated under the FOV of 0.965mrad which is measured by experimental test. The maximum FOV from 2km to 4km can be reversed further. At the same time, the test experiment platform was designed and the FOV of the laser communication terminal was measured. Compared with the theoretical calculation results, the maximum error is less than 55μrad, which is conformed to the error allowable range. Conclusion: By the method of measuring the FOV of the system, the defocus error which is caused by assembling can be calculated, so the maximum FOV of the system in different link distance can be simulated. The method not only solves the problem that the defocus amount is difficult to measure, but also provides theoretical guidance to increase the FOV of laser communication by introducing the image defocus.

Paper Details

Date Published: 18 December 2019
PDF: 7 pages
Proc. SPIE 11340, AOPC 2019: Optical Fiber Sensors and Communication, 1134006 (18 December 2019); doi: 10.1117/12.2539001
Show Author Affiliations
Yan An, Changchun Univ. of Science and Technology (China)
Yiyun Xu, Changchun Univ. of Science and Technology (China)
Keyan Dong, Changchun Univ. of Science and Technology (China)
Liang Gao, Changchun Univ. of Science and Technology (China)
Yan Xie, State Grid Corp. of China (China)


Published in SPIE Proceedings Vol. 11340:
AOPC 2019: Optical Fiber Sensors and Communication
Jie Zhang; Songnian Fu; Jun Yang, Editor(s)

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