Dual-wavelenth passive homodyne detection unit for fiber-coupled white-light interferometers

Michel Lequime; Catherine Lecot; Hugues Giovannini; Serge J. Huard

doi:10.1117/12.20316

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1 August 1990 Dual-wavelenth passive homodyne detection unit for fiber-coupled white-light interferometers

Michel Lequime, Catherine Lecot, Hugues Giovannini, Serge J. Huard

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Proceedings Volume 1267, Fiber Optic Sensors IV; (1990) https://doi.org/10.1117/12.20316
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

This paper is devoted to the description of a prototype Emission/Detection Unit, the ACCORD® Module, developed for the accurate demodulation of fiber optic sensors using spectral modulation encoding techniques. This prototype contains a static polarimetric interferometer with 4 ports to provide the four phase signals needed by the passive homodyne scheme, and uses a dual-wavelength arrangement to extend the measurement range by removing the 2ic ambiguity in the phase determination. Resolution as high as A/40000 has been achieved with 1 Hz bandwith and Optical Path Difference mismatch in a 20 microns range.

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Michel Lequime, Catherine Lecot, Hugues Giovannini, and Serge J. Huard "Dual-wavelenth passive homodyne detection unit for fiber-coupled white-light interferometers", Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); https://doi.org/10.1117/12.20316

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