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Nonlinear Mach-Zehnder interferometer isolator.

Neetesh Singh, Franz X Kärtner

    Optics Express
    |February 25, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel nonlinear Mach-Zehnder interferometer isolator for optical systems. The device offers high isolation and low insertion loss, overcoming limitations of traditional isolators.

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    Area of Science:

    • Photonics and optical engineering
    • Integrated optics
    • Nonlinear optics

    Background:

    • Optical isolators are crucial for low-noise systems, preventing detrimental back reflections.
    • Traditional isolators using magneto-optical materials have high insertion loss and integration challenges.
    • Existing nonlinear optical isolators face limitations in bandwidth, insertion loss, or fabrication complexity.

    Purpose of the Study:

    • To demonstrate a monolithic, chip-compatible nonlinear Mach-Zehnder interferometer isolator.
    • To overcome the limitations of existing optical isolator technologies.
    • To provide a broadband, wavelength-independent solution for optical isolation.

    Main Methods:

    • Development of a monolithic nonlinear Mach-Zehnder interferometer.
    • Utilizing third-order optical nonlinearity for isolation.
    • Fabrication compatible with complementary metal-oxide-semiconductor (CMOS) processes.

    Main Results:

    • Achieved up to 15 dB isolation with only 0.4 dB insertion loss.
    • Demonstrated a compact device footprint of 0.4 mm².
    • Device exhibits broadband operation, independent of wavelength, material, and platform.

    Conclusions:

    • The demonstrated nonlinear Mach-Zehnder interferometer isolator offers a promising solution for optical isolation.
    • This technology is suitable for both integrated and fiber-based optical systems.
    • The device overcomes key limitations of conventional and existing nonlinear isolators.