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Optimized grating-frustrated coupler.

A Yesayan, R Vallée

    Optics Letters
    |December 1, 2007
    PubMed
    Summary
    This summary is machine-generated.

    A novel grating-frustrated coupler design eliminates backreflected light. This enhanced coupler efficiently directs all light near the Bragg wavelength to the designated drop port.

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    Area of Science:

    • Photonics and optical engineering
    • Waveguide devices

    Background:

    • Grating-based optical couplers are essential components in integrated photonics.
    • Minimizing backreflection and maximizing transmission are critical performance metrics for optical couplers.

    Purpose of the Study:

    • To theoretically analyze a modified grating-frustrated coupler incorporating a second grating.
    • To demonstrate the capability of the proposed design to achieve zero backreflection and high transmission efficiency.

    Main Methods:

    • Detailed theoretical analysis using coupled-mode theory.
    • Numerical simulations to validate the analytical predictions.

    Main Results:

    • The addition of a second grating in the input channel effectively suppresses backreflected light to zero.

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  • The modified coupler demonstrates near-unity transmission of light at the Bragg wavelength to the drop port.

    • Conclusions:

    • The proposed modified grating-frustrated coupler offers superior performance for optical signal routing.
    • This design presents a significant advancement for applications requiring efficient and clean light coupling.