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Implementation of a Reference Interferometer for Nanodetection
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Method for measuring transfer function and impulse response of a single-fiber interferometric sensor.

Y Ohtsuka, S Tanaka

    Applied Optics
    |August 12, 2010
    PubMed
    Summary
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    This study presents a novel method for measuring the transfer function and impulse response of single-fiber interferometric sensors. The technique utilizes beat photocurrent from orthogonally polarized light to analyze axial vibrations for enhanced sensor characterization.

    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Signal Processing

    Background:

    • Interferometric sensors are crucial for various applications.
    • Accurate characterization of sensor dynamics, including transfer function and impulse response, is essential for reliable performance.
    • Existing methods may have limitations in direct measurement of these parameters for fiber-based systems.

    Purpose of the Study:

    • To develop and demonstrate a direct measurement method for the transfer function and impulse response of a single-fiber interferometric sensor.
    • To extract phase retardation changes from beat photocurrent.
    • To validate the method using controlled axial vibrations.

    Main Methods:

    • Superimposing orthogonally polarized optical waves of different frequencies along the fiber's slow and fast axes.

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  • Generating a beat photocurrent from the superimposed waves.
  • Extracting phase retardation changes directly from the beat photocurrent.
  • Applying axial vibrations with a known Gaussian spectrum to the fiber.

    • Main Results:

    • Successfully measured the transfer function and impulse response of the single-fiber interferometric sensor.
    • Demonstrated direct extraction of phase retardation from beat photocurrent.
    • Characterized sensor response within its linear frequency range.

    Conclusions:

    • The proposed method provides a direct and effective way to measure the transfer function and impulse response of single-fiber interferometric sensors.
    • This technique enhances the understanding and calibration of fiber optic sensing systems.
    • The method is applicable for characterizing sensor dynamics under specific excitation conditions.