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Related Experiment Video

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Implementation of a Reference Interferometer for Nanodetection
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Rhombic optical path difference bias white light interferometric fiber-optic gyroscope.

Ang Li, Zhenguo Jing, Qiang Liu

    Optics Letters
    |April 1, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel white light interferometric fiber-optic gyroscope (IFOG) that measures rotation rates without a phase modulator. It utilizes a unique rhombic optical path difference (OPD) bias structure for enhanced performance.

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    Area of Science:

    • Photonics and Optical Engineering
    • Inertial Navigation Systems

    Background:

    • Interferometric fiber-optic gyroscopes (IFOGs) are crucial for rotation sensing.
    • Traditional IFOGs often require phase modulators, adding complexity and cost.
    • Developing phase-modulator-free IFOGs is a key research objective.

    Purpose of the Study:

    • To propose and demonstrate a novel white light IFOG scheme.
    • To achieve rotation rate measurement without a phase modulator.
    • To utilize a fiber-optic rhombic optical path difference (OPD) bias structure.

    Main Methods:

    • A rhombic OPD bias structure was designed using four (2x1) 3 dB single-mode fiber couplers.
    • White light interferometric demodulation was employed to detect OPD changes.
    • The Sagnac phase shift was measured without a phase modulator.

    Main Results:

    • A principle prototype of the rhombic OPD bias white light IFOG was successfully constructed.
    • Experimental results demonstrated a linear output of the IFOG prototype.
    • The system achieved rotation rate measurement based on OPD difference.

    Conclusions:

    • The proposed rhombic OPD bias structure enables phase-modulator-free operation in white light IFOGs.
    • This novel scheme provides an absolute linear output for rotation rate measurement.
    • The demonstrated prototype validates the feasibility and effectiveness of the new IFOG design.