Abstract

A novel technique that enables coherent detection of spontaneous Brillouin scattering in the radio-frequency $(<500\text{\hspace{0.17em} MHz})$ region with excellent long-term stability has been demonstrated for distributed measurements of temperature and strain in long fiber. An actively stabilized single-frequency Brillouin fiber laser with extremely low phase noise and intensity noise is used as a well-defined, frequency-shifted local oscillator for the heterodyne detection, yielding measurements of spontaneous Brillouin scattering with high frequency stability. Based on this approach, a highly stable real-time fiber sensor for distributed measurements of both temperature and strain over long fiber has been developed utilizing advanced digital signal processing techniques.

© 2007 Optical Society of America

57-km single-ended spontaneous Brillouin-based distributed fiber temperature sensor using microwave coherent detection

Sally M. Maughan, Huai H. Kee, and Trevor P. Newson
Opt. Lett. 26(6) 331-333 (2001)

Simultaneous temperature and strain measurement with combined spontaneous Raman and Brillouin scattering

M. N. Alahbabi, Y. T. Cho, and T. P. Newson
Opt. Lett. 30(11) 1276-1278 (2005)

High sensitivity distributed temperature fiber sensor using stimulated Brillouin scattering

Victor Lambin Iezzi, Sebastien Loranger, and Raman Kashyap
Opt. Express 25(26) 32591-32601 (2017)

All-fiber system for simultaneous interrogation of distributed strain and temperature sensing by spontaneous Brillouin scattering

Huai H. Kee, Gareth P. Lees, and Trevor P. Newson
Opt. Lett. 25(10) 695-697 (2000)

Cost-effective bandwidth-reduced Brillouin optical time domain reflectometry using a reference Brillouin scattering beam

Daisuke Iida and Fumihiko Ito
Appl. Opt. 48(22) 4302-4309 (2009)