Self-Demodulated Heterodyne Frequency Domain Distributed Brillouin Fiber Sensor

Author

Bernini, Romeo ; Minardo, Aldo ; Zeni, Luigi

Author_Institution

Consiglio Nazionale delle Ricerche, Naples

Volume

19

Issue

6

fYear

2007

fDate

3/15/2007 12:00:00 AM

Firstpage

447

Lastpage

449

Abstract

We demonstrate a novel technique for Brillouin scattering-based distributed fiber sensing. The proposed technique is based on the use of two counterpropagating intensity-modulated optical signals, with their modulation frequencies differing by a small, fixed quantity. Stimulated Brillouin scattering leads to an optical demodulation of the probe signal, generating on its intensity spectrum a low-frequency component which is detected by a lock-in amplifier. As a proof of concept, measurement with a spatial resolution of 6 m is reported on a 230-m-long sensing fiber

Keywords

demodulation; distributed sensors; fibre optic sensors; heterodyne detection; optical modulation; remote sensing; stimulated Brillouin scattering; 230 m; Brillouin fiber sensor; Brillouin scattering; counterpropagating optical signals; distributed fiber sensor; heterodyne frequency domain sensor; intensity modulation; intensity spectrum; lock-in amplifier; low-frequency component; optical demodulation; probe signal; scattering-based fiber sensing; self-demodulation; spatial resolution; stimulated Brillouin scattering; Brillouin scattering; Fiber nonlinear optics; Frequency domain analysis; Nonlinear optics; Optical fiber sensors; Optical mixing; Optical modulation; Optical scattering; Optical sensors; Stimulated emission; Brillouin scattering; distributed sensor; fiber-optic sensor;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.892890

Filename

4130441