Abstract

This paper presents a method to locate a wideband perturbation along a fiber link using a fiber Fox–Smith interferometer (FSI). With an aluminum film coated at the end plane of fiber, phase of each interfering beam is modulated twice by the perturbation. An impact on the fiber by a bar connected with a motor is simulated as a wideband perturbation. The test point is acoustically and spatially isolated from the mass of the FSI. A short-time fast Fourier transform (FFT) shows a series of odd-multiple nulls in the averaged power spectrum from which the position of the impact can be determined. An experiment of 50 impacts at a distance of 22.85 km achieves a standard deviation of 0.041 km, corresponding to 0.18% relative error. The method achieves adjustable sensitivity, higher dynamic range, simplicity of installation, and low cost.

© 2007 IEEE

Fiber Fox–Smith resonators: application to single-longitudinal-mode operation of fiber lasers

Peter Barnsley, Paul Urquhart, Colin Millar, and Michael Brierley
J. Opt. Soc. Am. A 5(8) 1339-1346 (1988)

Location of a time-varying disturbance using an array of identical fiber-optic interferometers interrogated by CW DFB laser

Rodolfo Martínez Manuel, M. G. Shlyagin, and S. V. Miridonov
Opt. Express 16(25) 20666-20675 (2008)

Improved location algorithm for multiple intrusions in distributed Sagnac fiber sensing system

He Wang, Qizhen Sun, Xiaolei Li, Jianghai Wo, Perry Ping Shum, and Deming Liu
Opt. Express 22(7) 7587-7597 (2014)

Disturbance location and pattern recognition of a distributed optical fiber sensor based on dual-Michelson interferometers

Xin Lai, Houdan Yu, Yixiao Ma, Rui Lin, Qiuheng Song, and Bo Jia
Appl. Opt. 61(1) 241-248 (2022)

Nonlinear Fourier transform using multistage perturbation technique for fiber-optic systems

Elham Bidaki and Shiva Kumar
J. Opt. Soc. Am. B 35(9) 2286-2293 (2018)