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Related Experiment Video

Updated: Dec 9, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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23-dB average isolation using a silicon photonic Mach-Zehnder modulator.

Maxime Jacques, Eslam El-Fiky, Zhenping Xing

    Optics Express
    |September 10, 2020
    PubMed
    Summary

    We developed a silicon optical time-gate isolator using a traveling-wave Mach-Zehnder modulator. This device effectively blocks backward light and shows minimal signal-to-noise ratio penalty in high-speed data links.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Optical isolators are crucial for preventing back reflections in photonic systems.
    • Existing optical isolators often rely on bulky or complex magnetic components.
    • Integration of isolators onto silicon platforms is desirable for miniaturization and compatibility with electronic circuits.

    Purpose of the Study:

    • To demonstrate a novel optical time-gate isolator fabricated on the silicon-on-insulator (SOI) platform.
    • To evaluate the isolation performance and insertion loss of the device.
    • To assess the impact of the isolator on high-speed digital communication links.

    Main Methods:

    • Utilized a traveling-wave Mach-Zehnder modulator (TW-MZM) design on the SOI platform.

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  • Employed differential clock signals at 6.8 GHz to achieve time-gating.
  • Integrated the fabricated isolator into a 13.6 Gbaud PAM-4 digital communication link for performance testing.

    • Main Results:

    • Achieved time-averaged isolation of 18.2 dB (22.7 dB) with varying driver amplitudes.
    • Demonstrated effective blocking of backward light across all tested conditions.
    • Measured a minimal signal-to-noise ratio (SNR) penalty of 0.5 dB in a 13.6 Gbaud PAM-4 link.

    Conclusions:

    • The demonstrated optical time-gate isolator on SOI offers high isolation performance.
    • The device exhibits low impact on signal integrity in high-speed optical communication.
    • This silicon-based isolator is suitable for integration into larger photonic circuits to protect light sources and reduce interference.