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Birefringence compensated silicon nanowire arrayed waveguide grating for CWDM optical interconnects.

Jun Zou, Xiang Xia, Guanting Chen

    Optics Letters
    |April 2, 2014
    PubMed
    Summary

    We developed a compact silicon nanowire arrayed waveguide grating for optical interconnects. This device significantly reduces polarization-dependent wavelength shifts, improving coarse wavelength division multiplexing performance.

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    Area of Science:

    • Photonics and Optical Engineering
    • Nanotechnology
    • Integrated Optics

    Background:

    • Optical interconnects are crucial for high-speed data transmission.
    • Coarse wavelength division multiplexing (CWDM) enables efficient use of optical bandwidth.
    • Polarization-dependent wavelength shifts are a significant challenge in silicon photonics.

    Purpose of the Study:

    • To demonstrate a silicon nanowire arrayed waveguide grating (AWG) with birefringence compensation.
    • To enable compact and efficient CWDM optical interconnects.
    • To mitigate polarization-dependent wavelength shifts in AWGs.

    Main Methods:

    • Fabrication of an arrayed waveguide grating using silicon nanowires.
    • Implementation of angled star couplers and differential diffraction orders for TM and TE polarizations.

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  • Birefringence compensation techniques to reduce polarization dependency.

    • Main Results:

    • Achieved a compact device footprint of 0.36 mm × 0.17 mm.
    • Reduced polarization-dependent wavelength shifts from 380-420 nm to 0.5-3.5 nm.
    • Measured crosstalk below -18 dB for TM and -14 dB for TE polarization.

    Conclusions:

    • The demonstrated silicon nanowire AWG effectively compensates for birefringence.
    • The device offers a promising solution for high-performance CWDM optical interconnects.
    • The achieved reduction in polarization-dependent wavelength shifts enhances device reliability and performance.