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Phase noise elimination in frequency sweeping interferometry based on a common-path interferometer.

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    A novel common-path interferometer (CPI) method effectively suppresses phase noise in frequency sweeping interferometry. This technique enhances dynamic range and enables precise optical fiber and device polarization measurements.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Optical Sensing

    Background:

    • Frequency sweeping interferometry is susceptible to ambient and laser phase noise.
    • Existing methods for noise compensation often have limitations in dynamic range and environmental immunity.
    • High-precision measurements of optical fibers and devices require robust noise suppression techniques.

    Purpose of the Study:

    • To introduce a common-path interferometer (CPI) method for suppressing phase noise in frequency sweeping interferometry.
    • To demonstrate the effectiveness of the CPI method in improving dynamic range and immunity to ambient noise.
    • To enable high-precision distributed polarization measurements.

    Main Methods:

    • Development of a common-path interferometer (CPI) integrating main and auxiliary interferometers.
    • Utilizing signal mixing to eliminate common-mode interference phase noise.
    • Experimental validation of the CPI method's performance.

    Main Results:

    • Achieved a dynamic range of up to 110 dB.
    • Improved dynamic range by 10 dB compared to separated auxiliary interferometer methods.
    • Demonstrated immunity to ambient noise.
    • Enabled high-precision distributed polarization measurements.

    Conclusions:

    • The proposed common-path interferometer (CPI) method is highly effective in suppressing phase noise.
    • CPI offers superior dynamic range and ambient noise immunity for frequency sweeping interferometry.
    • This technique facilitates advanced distributed polarization measurements in optical systems.