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Method for improving the polarization extinction ratio of multifunction integrated optic circuits.

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    A new multifunction integrated optic circuit (MIOC) design enhances the polarization extinction ratio (PER) for fiber-optic gyroscopes (FOGs). Double absorption trenches effectively block unwanted TM mode recoupling, significantly improving FOG performance.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Fiber Optic Sensors

    Background:

    • The polarization extinction ratio (PER) is critical for polarization reciprocity in fiber-optic gyroscopes (FOGs).
    • Degradation of PER in multifunction integrated optic circuits (MIOCs) occurs due to TM mode recoupling, impacting FOG precision.
    • High PER is essential for high-precision FOG applications.

    Purpose of the Study:

    • To analyze TM mode propagation in MIOC substrates and identify causes of PER degradation.
    • To propose and validate a novel MIOC structure for improved PER.
    • To enhance the performance and reliability of high-precision FOGs.

    Main Methods:

    • Analysis of leaking TM mode propagation in the substrate.
    • Simulation of PER variation with chip structure using the overlap integral algorithm.
    • Design and comparison of a novel MIOC structure with a traditional design.

    Main Results:

    • A structure with double absorption trenches at the bottom of the MIOC was proposed.
    • The optimized MIOC design effectively blocks TM mode recoupling to the output port.
    • The proposed MIOC design achieved a PER increase of approximately 25 dB, reaching an average of 75 dB.

    Conclusions:

    • The novel MIOC design significantly improves PER compared to traditional designs.
    • The optimized MIOC structure demonstrates potential for applications in high-precision FOGs.
    • This advancement contributes to more accurate and reliable fiber-optic gyroscope systems.