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Related Experiment Video

Updated: Jan 28, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Circulator-free on-chip bidirectional four-wave mixing.

Jiabi Xiong, Yu Yu, Xinliang Zhang

    Optics Letters
    |March 2, 2019
    PubMed
    Summary

    This study introduces a novel, circulator-free method for on-chip bidirectional four-wave mixing (FWM) using microring resonators. This breakthrough enables versatile, compact integrated photonic devices with low crosstalk.

    Area of Science:

    • Integrated Photonics
    • Nonlinear Optics
    • Optical Communications

    Background:

    • On-chip bidirectional four-wave mixing (FWM) is crucial for advanced integrated photonic systems.
    • Existing methods require optical circulators, hindering miniaturization and versatility.
    • Lack of circulator-free solutions limits integration levels and system capabilities.

    Purpose of the Study:

    • To propose and demonstrate a circulator-free scheme for on-chip bidirectional FWM.
    • To leverage microring resonators for inherent bidirectional channel separation.
    • To enable multichannel nonlinear operations in compact integrated devices.

    Main Methods:

    • Utilized the inherent clockwise and counter-clockwise transmission properties of add-drop microring resonators.

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  • Implemented a resonance-enhanced nonlinear structure for multimode channel operation.
  • Investigated mode division multiplexing for enhanced integrated optoelectronics.

    • Main Results:

    • Successfully demonstrated on-chip bidirectional FWM without optical circulators.
    • Achieved FWM efficiencies of -26.78 dB and -28.69 dB for two-mode channels.
    • Maintained crosstalk levels below -35 dB, ensuring signal integrity.

    Conclusions:

    • The proposed circulator-free scheme is a universal solution for on-chip nonlinear operations.
    • This method offers a compact structure with low crosstalk for integrated photonic applications.
    • The successful implementation for multimode channels opens new avenues for mode division multiplexing.