Abstract

An image-matching assisted dual-frequency phase-sensitive optical time domain reflectometry ($\Phi - {\rm{OTDR}}$) is proposed and demonstrated. Compared to the conventional dual-frequency $\Phi - {\rm{OTDR}}$, which retrieves data via curve matching, the proposed scheme can effectively improve the temporal resolution and measurement precision while keeping the spatial resolution without additional hardware. In the experiments, with a 10 s temporal window, the proposed scheme realized the same measurement precision as the conventional method that used a 40 s window, suggesting a fourfold improvement of temporal resolution. When both used the 10 s temporal window, the measurement error was suppressed from 21.4% to 1.2% in the sensing for a 2 m hot zone at the end of a 90-m fiber.

© 2021 Optical Society of America

SNR dependence of measurement stability of heterodyne phase-sensitive optical time-domain reflectometry

Yang Lu, Zhijie Yu, Zewu Ju, Xiaoyang Hu, Mo Chen, and Zhou Meng
Appl. Opt. 59(21) 6333-6339 (2020)

Fading-free Φ-OTDR evaluation based on the statistical analysis of phase hopping

Heng Qian, Bin Luo, Haijun He, Yin Zhou, Xihua Zou, Wei Pan, and Lianshan Yan
Appl. Opt. 61(23) 6729-6735 (2022)

Low-noise and high-sensitivity Φ-OTDR based on an optimized dual-pulse heterodyne detection scheme

Zewu Ju, Zhijie Yu, Qingkai Hou, Kang Lou, Mo Chen, Yang Lu, and Zhou Meng
Appl. Opt. 59(7) 1864-1870 (2020)

Characterizing detection noise in phase-sensitive optical time domain reflectometry

Xin Lu and Katerina Krebber
Opt. Express 29(12) 18791-18806 (2021)

Using DFB laser self-injection locked to an optical waveguide ring resonator as a light source of Φ-OTDR

Xuyang Zhu, Xiuli Li, Rong Zhang, Zhenming Zhao, and Mei Kong
Appl. Opt. 60(31) 9769-9773 (2021)