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Compact wavelength router based on a Silicon-on-insulator arrayed waveguide grating pigtailed to a fiber array.

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    Summary

    We developed a compact 4x4 wavelength router using silicon photonics. This device, built with CMOS methods, offers efficient light routing for optical networks.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Silicon Photonics

    Background:

    • Wavelength routers are key components in optical communication networks.
    • Miniaturization and efficient fabrication are crucial for scalable photonic integrated circuits.

    Purpose of the Study:

    • To demonstrate a compact, fiber-pigtailed 4x4 wavelength router.
    • To achieve low insertion loss and crosstalk using CMOS processing.

    Main Methods:

    • Fabrication of a silicon-on-insulator (SOI) photonic wire device.
    • Design and implementation of an Arrayed Waveguide Grating (AWG) with 250GHz channel spacing.
    • Application of a two-step processing technique to reduce insertion loss.
    • Integration with vertical fiber couplers and an eight-fiber array connector.

    Main Results:

    • A compact 4x4 wavelength router with a footprint of 425x155 µm² was fabricated.
    • The Arrayed Waveguide Grating (AWG) exhibited a 250GHz channel spacing and 1THz free spectral range.
    • Insertion loss was reduced to 3.5dB.
    • Crosstalk was measured at -12dB.

    Conclusions:

    • The demonstrated device represents a compact and efficient wavelength router for optical communication systems.
    • CMOS fabrication offers a scalable approach for producing such photonic integrated circuits.
    • The achieved performance metrics indicate suitability for practical applications in optical networking.