Low-Coherence Fiber Differential Interferometer With Adjustable Measurement Range

Author

Shenglai Zhen ; Jian Chen ; Hui Li ; Xiaoguang Wang ; Bo Zhang ; Benli Yu

Author_Institution

Key Lab. of Opt.-Electron. Inf. Acquisition & Manipulation, Anhui Univ., Hefei, China

Volume

27

Issue

8

fYear

2015

fDate

April15, 15 2015

Firstpage

895

Lastpage

898

Abstract

A low-coherence fiber differential interferometer with adjustable measurement range is presented in this letter. The interferometer is based on an all fiber Mach-Zehnder and Sagnac hybrid interferometer. Results show that the measurement range of the differential interferometer is related to the delay fiber length, which can be adjusted by an optical switch. The experimental results demonstrate that the phase demodulation resolution is $3.37times 10^{-5}$ rad and the maximum measuring amplitude is 419 rad with a signal frequency of 1 kHz. This scheme can be used to measure many kinds of parameters, such as vibration and electrical current.

Keywords

Mach-Zehnder interferometers; Sagnac interferometers; electric current measurement; fibre optic sensors; optical switches; phase modulation; vibration measurement; Sagnac hybrid interferometer; adjustable measurement range; all fiber Mach-Zehnder interferometer; delay fiber length; electrical current measurement; frequency 1 kHz; low-coherence fiber differential interferometer; maximum measuring amplitude; optical switch; phase demodulation resolution; signal frequency; vibration measurement; Delays; Optical fiber couplers; Optical fiber sensors; Optical interferometry; Sagnac interferometers; Dynamic range; Low-coherence; Passive demodulation; low-coherence; optical fiber interferometry; passive demodulation; phase measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2399775

Filename

7029600