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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 28,
  • Issue 22,
  • pp. 3294-3299
  • (2010)

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

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Abstract

An all-fiber 3x3 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.

© 2010 IEEE

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