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Chip-integrated all-optical 4-bit Gray code generation based on silicon microring resonators.

Li Liu, Jianji Dong, Xinliang Zhang

    Optics Express
    |September 15, 2015
    PubMed
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    We developed a silicon-based 4-bit Gray code encoder using the thermo-optic (TO) effect in microring resonators (MRRs). This compact device enables all-optical data processing for communication systems.

    Area of Science:

    • Photonics
    • Integrated Optics
    • Silicon Photonics

    Background:

    • All-optical signal processing is crucial for high-speed communication.
    • Gray code encoding is essential for error reduction in digital systems.
    • Silicon microring resonators (MRRs) offer tunable optical properties via the thermo-optic (TO) effect.

    Purpose of the Study:

    • To propose and demonstrate a novel 4-port passive encoder for 4-bit Gray code generation.
    • To leverage the thermo-optic (TO) effect in silicon MRRs for all-optical encoding.
    • To develop a compact and scalable silicon photonic device for optical communication.

    Main Methods:

    • Utilized the thermo-optic (TO) effect in silicon microring resonators (MRRs).
    • Engineered controllable and switchable output powers by shifting MRR transmission spectra with injected light.

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  • Defined two threshold powers to determine binary output ('0' or '1').
  • Combined two independent resonant wavelengths from two MRRs for 4-bit Gray code generation.

    • Main Results:

    • Successfully demonstrated all-optical 4-bit Gray code generation on a pure silicon platform.
    • Achieved controllable and switchable output powers from MRR through-ports and drop-ports.
    • The encoder operates based on distinct threshold powers for binary state determination.

    Conclusions:

    • The proposed passive encoder offers a simple, compact, and scalable solution for on-chip all-optical communication.
    • This silicon photonic device is well-suited for optical interconnection systems.
    • The demonstrated Gray code encoder highlights the potential of MRR-based devices in future optical networks.