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Related Experiment Video

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Complex apodized Bragg grating filters without circulators in silicon-on-insulator.

Alexandre D Simard, Sophie LaRochelle

    Optics Express
    |July 21, 2015
    PubMed
    Summary

    This study introduces a novel circulator-free reflective filter using Bragg gratings in a Mach-Zehnder interferometer. This innovation enhances photonic circuits by reducing phase noise and enabling complex filter designs on silicon platforms.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Nanophotonics

    Background:

    • Bragg gratings are essential components in photonic circuits, acting as versatile filters.
    • Current limitations exist due to the lack of CMOS-compatible integrated circulators for reflective filters.
    • Mach-Zehnder interferometers offer a platform for integrated optical devices.

    Purpose of the Study:

    • To propose and demonstrate a novel reflective filter design for photonic circuits.
    • To overcome the limitations imposed by the absence of integrated circulators.
    • To enhance the filtering capabilities of silicon-based photonic platforms.

    Main Methods:

    • Integration of two identical Bragg gratings within the arms of a Mach-Zehnder interferometer.
    • Utilizing multimode interference 2x2 couplers to construct the interferometer.
    • Employing superposition apodization for implementing complex filter designs.

    Main Results:

    • Demonstration of a circulator-free reflective filter with unique properties.
    • Significant reduction in phase noise distortions and elimination of thermal phase tuning.
    • Successful experimental fabrication of high-quality Bragg grating filters.
    • Achieved a dispersion-less, square-shaped filter with >15 dB sidelobe suppression and 2.0 ps group delay standard deviation.

    Conclusions:

    • The proposed Mach-Zehnder interferometer-based Bragg grating filter offers a circulator-free solution.
    • This approach enables the fabrication of narrowband reflective filters with sharp spectral responses.
    • The technology significantly improves filtering capabilities on the silicon photonic platform.