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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Updated: Jun 24, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Compact polarization transceiver module for fiber optic gyroscopes.

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    A new transceiver module enhances polarization-maintaining interferometric fiber optic gyroscopes (PM-IFOGs) with high polarization extinction ratio (PER). This innovation leads to smaller, more efficient, and cost-effective PM-IFOG systems.

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    Area of Science:

    • Optoelectronics
    • Optical Engineering
    • Fiber Optic Sensors

    Background:

    • Polarization-maintaining interferometric fiber optic gyroscopes (PM-IFOGs) are crucial for inertial navigation.
    • Existing transceiver modules can be bulky and expensive, limiting widespread adoption.
    • Improving the polarization extinction ratio (PER) is key to enhancing IFOG performance.

    Purpose of the Study:

    • To develop and validate a novel transceiver module for PM-IFOGs.
    • To achieve a high PER and low optical loss in the transceiver module.
    • To demonstrate the integration of the transceiver module into a functional IFOG prototype.

    Main Methods:

    • Design and simulation of a graded-index (GRIN) lens with a slanted face and multilayer film coating.
    • Utilizing the ray matrix method and physical optical propagation for optical design.
    • Fabrication and integration of the transceiver module with a polarization-maintaining sensing coil.

    Main Results:

    • The developed transceiver module achieves a high PER exceeding 25 dB.
    • The optical loss of the transceiver module is measured at approximately 3.77 dB.
    • The integrated IFOG prototype exhibits a bias instability of 0.51°/h.

    Conclusions:

    • The novel transceiver module significantly improves PER for PM-IFOGs.
    • The proposed design enables simultaneous collimation and beam splitting.
    • This advancement contributes to miniaturized, cost-effective, and power-efficient PM-IFOG systems.