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Phase-Shifted White-Light Interferometry for the Absolute Measurement of Fiber Optic Mach–Zehnder Interferometers

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5 Author(s)
Yi Jiang ; Sch. of Optoelectron., Beijing Inst. of Technol., Beijing, China ; Wenhui Ding ; Pengjuan Liang ; Fu, Lei
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An all-fiber 3 times; 3 coupler based phase-shifted white-light interferometry is presented, with which the absolute optical path difference (OPD) of a Mach-Zehnder interferometer can be measured automatically. The continuous test shows that the variation is ±0.5 μm when measuring a beam length of ~10 m with an OPD of 1847 μm. The technique is successfully demonstrated to measure static measurands, including strain, temperature and weight.

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Lightwave Technology, Journal of  (Volume:28 ,  Issue: 22 )