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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,...
Fiber optic Fourier transform white-light interferometry is presented to interrogate the absolute optical path difference of an Mach-Zehnder interferometer. The phase change of the interferometer caused by scanning wavelength can be calculated by a Fourier transform-based phase demodulation technique. A linear output is achieved.
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