Fiber-optic sensor array based on Sagnac interferometer with stable phase bias

Author

Ki Ho Han ; Wang Joo Lee ; Byoung Yoon Kim

Author_Institution

Dept. of Phys., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea

Volume

13

Issue

2

fYear

2001

fDate

2/1/2001 12:00:00 AM

Firstpage

148

Lastpage

150

Abstract

We propose and experimentally demonstrate a novel fiber sensor array based on a Sagnac interferometer with very simple electronic signal processing. A stable quadrature phase bias was obtained using a phase modulator, and the polarization-induced signal fading was suppressed by using a depolarizer and a broad-band source. A phase sensitivity of about 4.0 μrad/sub rms///spl radic/Hz at 5 kHz was obtained using a two-sensor array.

Keywords

fading; fibre optic sensors; light interferometers; optical arrays; optical fibre polarisation; optical information processing; optical modulation; optical polarisers; phase modulation; sensitivity; time division multiplexing; 5 kHz; Sagnac interferometer; broad-band source; depolarizer; electronic signal processing; fiber sensor array; fiber-optic sensor array; phase modulator; phase sensitivity; polarization-induced signal fading; signal fading suppression; stable phase bias; stable quadrature phase bias; two-sensor array; Acoustic sensors; Fading; Optical fiber polarization; Optical fiber sensors; Optical interferometry; Optical sensors; Optical signal processing; Phased arrays; Sagnac interferometers; Sensor arrays;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.910517

Filename

910517