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Related Experiment Video

Updated: Apr 18, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Silicon waveguide filter based on cladding modulated anti-symmetric long-period grating.

Qing Liu, Zhonghua Gu, Jack Sheng Kee

    Optics Express
    |January 22, 2015
    PubMed
    Summary

    This study presents a novel optical filter using a specialized grating in silicon waveguides. This cladding modulated anti-symmetric long-period grating enables efficient light filtering for optical communication applications.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Two-mode silicon waveguides are crucial for advanced optical signal processing.
    • Long-period gratings are used for wavelength-selective filtering in optical devices.
    • Controlling grating properties is essential for optimizing filter performance.

    Purpose of the Study:

    • To demonstrate an optical filter based on a cladding modulated anti-symmetric long-period grating in a two-mode silicon waveguide.
    • To investigate the influence of waveguide and grating parameters on filter characteristics.
    • To experimentally validate the performance of the proposed band-rejection filter.

    Main Methods:

    • Fabrication of a two-mode silicon waveguide with integrated linear tapers.
    • Formation of an anti-symmetric grating using periodic silicon square arrays.
    • Characterization of the filter using coupled-mode theory and experimental measurements.
    • Analysis of grating coupling strength, transmission spectrum, and bandwidth.

    Main Results:

    • Successful demonstration of band-rejection filters in various two-mode silicon waveguide widths (1-μm, 0.8-μm, 0.7-μm).
    • Achieved maximal attenuation contrasts greater than 15 dB, corresponding to ~97% coupling efficiency.
    • Demonstrated control over grating coupling strength via waveguide width and grating separation.
    • Observed different bandwidths for rejection bands depending on waveguide dimensions.

    Conclusions:

    • The cladding modulated anti-symmetric long-period grating is an effective method for creating high-performance optical filters in silicon photonics.
    • The proposed filter design offers tunable characteristics and high coupling efficiency.
    • This technology holds potential for advanced optical communication and signal processing systems.