Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2399775
