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Sensors  2012 

In-Line Fiber Optic Interferometric Sensors in Single-Mode Fibers

DOI: 10.3390/s120810430

Keywords: in-line fiber-optic sensor, Fabry-Perot interferometer, core-cladding-mode interferometer, Mach-Zehnder Interferometer, Michelson interferometer

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Abstract:

In-line fiber optic interferometers have attracted intensive attention for their potential sensing applications in refractive index, temperature, pressure and strain measurement, etc. Typical in-line fiber-optic interferometers are of two types: Fabry-Perot interferometers and core-cladding-mode interferometers. It’s known that the in-line fiber optic interferometers based on single-mode fibers can exhibit compact structures, easy fabrication and low cost. In this paper, we review two kinds of typical in-line fiber optic interferometers formed in single-mode fibers fabricated with different post-processing techniques. Also, some recently reported specific technologies for fabricating such fiber optic interferometers are presented.

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