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Multi-wavelength add-drop filter with phase-modulated shifted Bragg grating.

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    |June 30, 2018
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    Summary
    This summary is machine-generated.

    This study demonstrates a novel multichannel add-drop filter using a phase-modulated shifted Bragg grating. The silicon-on-insulator device achieves precise wavelength filtering for telecommunications applications.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Integrated photonic devices are crucial for optical communication systems.
    • Efficient wavelength-selective filtering is essential for multiplexing and demultiplexing optical signals.
    • Silicon-on-insulator (SOI) platforms offer advantages for photonic integration.

    Purpose of the Study:

    • To demonstrate a novel multichannel add-drop filter.
    • To implement phase modulation on a shifted Bragg grating for wavelength control.
    • To achieve efficient add-drop operation in the telecom C-band using SOI waveguides.

    Main Methods:

    • Fabrication of a shifted Bragg grating filter on a silicon-on-insulator platform.
    • Coating the waveguide with titanium dioxide (TiO2) to reduce refractive index contrast.
    • Phase modulation of the shifted Bragg grating using an iterative Fourier transform algorithm.
    • Experimental validation of multichannel add-drop operation for three and five wavelength channels.

    Main Results:

    • Successful demonstration of multichannel add-drop operation.
    • Achieved a narrow line width of 0.6 nm.
    • Obtained a high extinction ratio of 20 dB.
    • Experimental results showed excellent agreement with theoretical design.

    Conclusions:

    • The developed phase-modulated shifted Bragg grating filter enables efficient multichannel add-drop functionality.
    • The use of TiO2 coating on SOI waveguides is effective in managing refractive index contrast.
    • This technology holds promise for advanced optical communication networks.