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Updated: May 1, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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An SOI based polarization insensitive filter for all-optical clock recovery.

Jinghui Zou, Yu Yu, Weili Yang

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    |March 26, 2014
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    Summary

    We developed a compact silicon-on-insulator filter for all-optical clock recovery (CR). This device achieves a high-quality clock signal with low timing jitter, regardless of input signal polarization.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Optical Communications

    Background:

    • All-optical clock recovery (CR) is crucial for high-speed optical networks.
    • Polarization sensitivity in optical components limits system performance and stability.
    • Silicon-on-insulator (SOI) technology offers a platform for compact and efficient photonic devices.

    Purpose of the Study:

    • To design and demonstrate a polarization-insensitive filter for all-optical clock recovery.
    • To achieve low timing jitter in recovered clock signals.
    • To leverage SOI technology for a compact CR solution.

    Main Methods:

    • Fabrication of a device comprising a microring resonator (MRR) and modified 2D grating couplers on SOI.
    • Integration of distributed Bragg reflectors (DBRs) to enhance grating coupler efficiency.
    • Utilizing 2D grating couplers for polarization diversity and an MRR as a comb filter for CR.
    • Employing a semiconductor optical amplifier (SOA) for amplitude equalization.

    Main Results:

    • Demonstration of a compact, polarization-insensitive filter for all-optical CR.
    • Achieved a high-quality clock signal with 970 fs timing jitter at 44 Gb/s.
    • Successful operation with input signals of arbitrary polarization states.

    Conclusions:

    • The proposed SOI-based filter effectively addresses polarization sensitivity in all-optical CR.
    • The integrated device enables robust and high-performance clock recovery for optical communication systems.
    • This technology paves the way for more stable and efficient optical network components.