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Real-time location of multiple time-varying strain disturbances acting over a 40km fiber section using a novel dual-Sagnac interferometer

Real-time location of multiple time-varying strain disturbances acting over a 40km fiber section using a novel dual-Sagnac interferometer
Real-time location of multiple time-varying strain disturbances acting over a 40km fiber section using a novel dual-Sagnac interferometer
Updated results using a novel sensing architecture based on a Sagnac interferometer are presented and, for the first time, real-time separation and positioning of multiple disturbances has been realized. A 40-km long dual-Sagnac sensor was formed by spectral slicing of light from a single, broad-band erbium-doped-fiber super-luminescent source and wavelength division multiplexed (WDM) routing around the loop to form an inherently low loss system. Independent active phase biasing of each Sagnac was employed, allowing the use of a single optical detector. The effects of residual optical cross talk between the two Sagnacs has been accurately modeled, allowing resulting errors to be corrected. The new system has capability for narrow-band fast Fourier transform (FFT) analysis of detected disturbance signals, and hence their separation in the frequency domain. For audio-frequency excitation, an average positional resolution of 100 m over a 40-km length was achieved with a postdetection signal processing bandwidth of 8 Hz
0733-8724
205-213
Russell, S.J.
926d527c-ff5d-4d35-99d9-9366bcd2bb10
Brady, K.R.C.
705fcf9d-d868-40df-ae1a-7c3983599ad5
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904
Russell, S.J.
926d527c-ff5d-4d35-99d9-9366bcd2bb10
Brady, K.R.C.
705fcf9d-d868-40df-ae1a-7c3983599ad5
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904

Russell, S.J., Brady, K.R.C. and Dakin, J.P. (2001) Real-time location of multiple time-varying strain disturbances acting over a 40km fiber section using a novel dual-Sagnac interferometer. IEEE Journal of Lightwave Technology, 19 (2), 205-213. (doi:10.1109/50.917882).

Record type: Article

Abstract

Updated results using a novel sensing architecture based on a Sagnac interferometer are presented and, for the first time, real-time separation and positioning of multiple disturbances has been realized. A 40-km long dual-Sagnac sensor was formed by spectral slicing of light from a single, broad-band erbium-doped-fiber super-luminescent source and wavelength division multiplexed (WDM) routing around the loop to form an inherently low loss system. Independent active phase biasing of each Sagnac was employed, allowing the use of a single optical detector. The effects of residual optical cross talk between the two Sagnacs has been accurately modeled, allowing resulting errors to be corrected. The new system has capability for narrow-band fast Fourier transform (FFT) analysis of detected disturbance signals, and hence their separation in the frequency domain. For audio-frequency excitation, an average positional resolution of 100 m over a 40-km length was achieved with a postdetection signal processing bandwidth of 8 Hz

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Published date: February 2001
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 13726
URI: https://eprints.soton.ac.uk/id/eprint/13726
ISSN: 0733-8724
PURE UUID: 9b9f56d0-54bd-487d-a6e7-05eb4d2b6bf9

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Date deposited: 06 Jan 2005
Last modified: 15 Jul 2019 19:34

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Contributors

Author: S.J. Russell
Author: K.R.C. Brady
Author: J.P. Dakin

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