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    Area of Science:

    • Photonics and Sensor Technology
    • Integrated Optics
    • Materials Science

    Background:

    • Microring resonators are sensitive optical devices.
    • Existing sensors face challenges with laser power fluctuations and cost-effectiveness.
    • Need for integrated, stable, and sensitive sensing solutions.

    Purpose of the Study:

    • To propose and demonstrate a novel, highly sensitive integrated sensor.
    • To develop a fast-response and cost-effective sensing system.
    • To eliminate the effect of input laser power fluctuation on sensor performance.

    Main Methods:

    • Utilizing a silicon-on-insulator microring resonator.
    • Implementing a linear amplitude comparison sensing function (ACSF).
    • Simultaneously monitoring optical powers from the through and drop ports of an add-drop microring resonator.

    Main Results:

    • Achieved a highly enhanced linear relationship between resonant wavelength shift and ACSF (R-squared > 0.99).
    • Demonstrated a proof-of-concept temperature sensor with an almost constant ACSF (±0.9% discrepancy) under varying laser power.
    • The ACSF effectively eliminates the impact of unexpected power fluctuations.

    Conclusions:

    • The proposed integrated sensor offers high sensitivity and stability.
    • The ACSF method provides a robust solution for optical power fluctuation compensation.
    • This technology is promising for cost-effective and fast-response sensing applications.