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Surface relief apodized grating tunable filters produced by using a shadow mask.

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    |September 15, 2015
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    Summary

    A novel polymeric Bragg reflection filter with an apodized grating structure offers a compact, low-cost tunable filter for WDM optical communications. This device achieves high reflectivity and precise bandwidth control, enabling tunable wavelength filtering.

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    Area of Science:

    • Photonics
    • Materials Science
    • Optical Communications

    Background:

    • Wavelength Division Multiplexing (WDM) optical communication systems require compact, low-cost tunable filters.
    • Traditional filters often face challenges with bandwidth broadening and reflectivity.

    Purpose of the Study:

    • To propose and demonstrate a polymeric Bragg reflection filter with an apodized grating structure.
    • To achieve high reflectivity and narrow bandwidths for tunable optical filtering.

    Main Methods:

    • Fabrication of a high-contrast polymeric waveguide.
    • Implementation of an apodized grating structure using dry etching with a shadow mask.
    • Characterization of filter performance, including reflectivity and bandwidth.

    Main Results:

    • Achieved 95% reflection with narrow 3-dB and 20-dB bandwidths of 0.36 nm and 0.72 nm, respectively.
    • Demonstrated wavelength tunability over 14 nm with 500 mW of thermal power.
    • The apodized grating effectively overcame bandwidth broadening issues.

    Conclusions:

    • The proposed polymeric Bragg reflection filter is a viable solution for compact, low-cost tunable filtering in WDM systems.
    • Apodization of the grating is crucial for achieving precise spectral control and high performance.
    • The device shows potential for advanced optical communication applications.