The research on the aliasing noise in a dual-pulse heterodyne phase-sensitive OTDR system

Qi Zhu; Xiaoyang Hu; Zhou Meng

doi:10.1117/12.2624413

27 March 2022 The research on the aliasing noise in a dual-pulse heterodyne phase-sensitive OTDR system

Qi Zhu, Xiaoyang Hu, Zhou Meng

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121695L (2022) https://doi.org/10.1117/12.2624413
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

We adopt and establish a type of distributed optical fiber sensor (DOFS) system structure with good qualities. Based on the phase-sensitive optical time-domain reflectometry (φ-OTDR) sensing system, we study the aliasing noise in the dual-pulse heterodyne system. Through practical experiment using this setup and parameter setting, we realize a relatively good background noise level as -73.6595 dB at 1 kHz. Through theoretical analysis, we find that the influence of the pulse repetition rate introduces the aliasing noise to the system which follows a linear relation in theory that the phase noise will increase 3 dB when repetition rate goes half. Furthermore, we obtain the experimental result that the changing value is 2.45 dB close to the theoretical value which can verify the reliability of the conclusion about the aliasing noise in the dual-pulse phase-sensitive φ-OTDR system.

Citation Download Citation

Qi Zhu, Xiaoyang Hu, and Zhou Meng "The research on the aliasing noise in a dual-pulse heterodyne phase-sensitive OTDR system", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121695L (27 March 2022); https://doi.org/10.1117/12.2624413

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