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Proceedings Paper

A high precision optical fiber time-delay system
Author(s): Hong Yan; Zhuo Li; Yanze Gao; Suhui Yang; Xin Wang
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Paper Abstract

Time-delay technology is widely used in machine vision, optical communication, laser radar (LIDAR), photoelectric detection and other fields. Compared with electric time-delay technology, optical fiber time-delay technology has many advantages under the condition of large delay time, such as high delay accuracy, good delay stability, small jitter, strong anti-electromagnetic interference ability, and less environmental impact, etc. It has attracted much attention in related fields. In order to achieve a larger delay time and a higher delay accuracy, this paper focused on the high-precision CNC (computerized numerical control) optical fiber delay system applied to laser echo simulator. The system consisted of 16 delay fibers, 16 optical fiber jumpers and 17 optical switches. By using binary gated mode, the delay of 0-64553ns was achieved and the laser echo of 0-5km was simulated. Using 10kHz-100MHz modulated laser, the actual length of 16 delay optical fibers was accurately measured by phase method, and the measurement error was less than 28.6mm. Aiming at the problem that the accuracy of long optical fiber cutting was poor in engineering, a compensation method for changing the delay resolution of the system is proposed, so that the delay precision of the whole system is controlled within 0.984 ns. The effects of temperature changes on the refractive index of the fiber and the length of the fiber on the system delay time are analyzed. The experimental device developed can achieve a delay of 0-64553 ns, a delay resolution of 0.984 ns, and a delay measurement accuracy of 0.14 ns. The system has been successfully applied.

Paper Details

Date Published: 12 March 2020
PDF: 10 pages
Proc. SPIE 11434, 2019 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 114340G (12 March 2020); doi: 10.1117/12.2542681
Show Author Affiliations
Hong Yan, Beijing Institute of Technology (China)
Zhuo Li, Beijing Institute of Technology (China)
Yanze Gao, Beijing Institute of Technology (China)
Suhui Yang, Beijing Institute of Technology (China)
Xin Wang, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 11434:
2019 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Juan Liu; Baohua Jia; Xincheng Yao; Yongtian Wang; Takanori Nomura, Editor(s)

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