Novel Demodulation Method for Fiber-Optic Interferometers Based on π/2 Phase Modulation

被引：4
|
作者：
Jin, Xiaofeng [1 ]
Ou, Jinhai [1 ]
Hao, Ran [1 ]
Zhou, Feng [1 ]
Zhang, Xianmin [1 ]
Zheng, Shilie [1 ]
Chi, Hao [1 ]
机构：
[1] Zhejiang Univ, Dept Informat Sci & Elect Engn, Hangzhou 310027, Peoples R China
来源：
IEEE PHOTONICS TECHNOLOGY LETTERS | 2012年 / 24卷 / 22期
关键词：
Digital pi/2 phase modulation; fiber-optic interferometer; fiber-optic sensor;
D O I：
10.1109/LPT.2012.2215957
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This letter proposes a novel demodulation method for fiber-optic interferometer sensors. A fast square wave is added to the reference arm of the interferometer sensor in the form of phase modulation. Starting from this, we successfully developed a simple demodulation method that can greatly improve the conversion efficiency and overcome the unbalanced influences. Our experiment results show that a very small phase shift of about 6.3 x 10(-5) rad can be detected, which proves high signal-to-noise ratio demodulated signal and low distortion in our demodulation method. The linearity between demodulated signal and test signal is shown to be over 99%.
引用
收藏
页码：1981 / 1983
页数：3
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