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Optical coherence effects on a fiber-sensing Fabry-Perot interferometer.

Y Ohtsuka

    Applied Optics
    |April 20, 2010
    PubMed
    Summary

    The temporal coherence of a laser source significantly impacts fiber-optic Fabry-Perot interferometer performance. Key parameters like peak transmission, finesse, and sensing sensitivity depend on the ratio of mirror separation to the laser

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    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensors

    Background:

    • Fiber-optic Fabry-Perot interferometers are crucial optical sensing devices.
    • The performance of these interferometers is influenced by the properties of the light source, particularly its temporal coherence.

    Purpose of the Study:

    • To describe the effect of temporal coherence from a light source on a fiber-optic Fabry-Perot interferometer.
    • To establish a relationship between interferometer parameters and the coherence length of the laser source.

    Main Methods:

    • Analysis of the ratio between end-mirror separation (h) and coherence length (L(c)) of a single-frequency laser.
    • Derivation of a criterion for the maximum permissible mirror separation, h(c).

    Main Results:

    • Peak transmission and finesse are highly dependent on the h/L(c) ratio.
    • A critical mirror separation, h(c) = (0.1/2π)L(c), is identified.
    • Sensing sensitivity is shown to be associated with the h/L(c) ratio.

    Conclusions:

    • The temporal coherence of the light source is a critical factor in determining the transmission characteristics of fiber-optic Fabry-Perot interferometers.
    • Optimizing the h/L(c) ratio is essential for maximizing interferometer performance and sensing sensitivity.

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