Optical frequency domain reflectometer based on digital frequency sweep of fixed wavelength laser source

Muping Song; Ge Chen; Yuxin Zhang; Enxue Cui

doi:10.1117/12.2626847

14 February 2022 Optical frequency domain reflectometer based on digital frequency sweep of fixed wavelength laser source

Muping Song, Ge Chen, Yuxin Zhang, Enxue Cui

Author Affiliations +

Proceedings Volume 12161, 4th International Conference on Informatics Engineering & Information Science (ICIEIS2021); 1216117 (2022) https://doi.org/10.1117/12.2626847
Event: 4th International Conference on Informatics Engineering and Information Science, 2021, Tianjin, China

Abstract

An optical frequency-domain reflectometry (OFDR) based on non-tunable laser is presented in this article. Instead, a common narrow-linewidth laser modulated by an external phase modulator is used for source. By swiftly changing the modulation frequency thus sweeping the frequency of modulated light, the linear chirp probe light needed in OFDR can be made. Comparing to the common tunable laser, this external modulation scheme has a better repeatability. The corresponding experimental system is constructed to verify the system performance, and the detection distance is longer than 4km. Firstly, the end and junction reflection of the optical fiber at 4.1km was detected. Secondly, 30kHz vibration signal is detected at this position. Finally, the stress near this position is detected.

Citation Download Citation

Muping Song, Ge Chen, Yuxin Zhang, and Enxue Cui "Optical frequency domain reflectometer based on digital frequency sweep of fixed wavelength laser source", Proc. SPIE 12161, 4th International Conference on Informatics Engineering & Information Science (ICIEIS2021), 1216117 (14 February 2022); https://doi.org/10.1117/12.2626847

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