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Fiber recirculating delay-line tunable depolarizer.

P Shen, J C Palais, C Lin

    Applied Optics
    |February 13, 2008
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    A novel fiber optic depolarizer using a coupler and delay line effectively reduces polarization.", "It minimizes polarization fluctuations in sensitive fiber-optic systems, validated by theoretical and experimental results.

    Area of Science:

    • Optics and Photonics
    • Fiber Optic Technology
    • Coherent Light Systems

    Background:

    • Polarization fluctuations in fiber optic systems can degrade performance.
    • Existing depolarization methods may have limitations with coherent light sources.

    Purpose of the Study:

    • To propose and demonstrate a new all-single-mode fiber depolarizer.
    • To investigate its effectiveness in reducing the degree of polarization.
    • To show its utility in mitigating polarization-induced noise in fiber-optic systems.

    Main Methods:

    • Design and theoretical analysis of a fiber depolarizer based on a 2x2 coupler and recirculating delay line.
    • Experimental validation of the depolarizer's performance with a narrow-band laser source.
    • Evaluation of polarization reduction and its impact on polarization-sensitive systems.

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    Main Results:

    • The proposed fiber depolarizer successfully reduced the degree of polarization from 99.8% to 1.15%.
    • Experimental results confirmed the theoretical model's predictions.
    • The device effectively eliminated polarization fluctuation effects in a test system.

    Conclusions:

    • The developed fiber depolarizer is effective for coherent light sources.
    • It offers a practical solution for mitigating polarization-related issues in fiber-optic applications.
    • The design principles provide a basis for future optimization and implementation.