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All-optical linearized Mach-Zehnder modulator.

Paul A Morton, Jacob B Khurgin, Michael J Morton

    Optics Express
    |November 23, 2021
    PubMed
    Summary
    This summary is machine-generated.

    A novel Mach-Zehnder modulator (MZM) design achieves unprecedented linearity in radiofrequency (RF) photonic links by using an optical local oscillator to cancel distortion. This all-optical linearization method significantly enhances spurious-free dynamic range for optical communication systems.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Radio-Frequency (RF) Engineering

    Background:

    • Linearization is crucial for enhancing the performance of radio-frequency (RF) photonic links.
    • Third-order intermodulation distortion is a primary limitation in Mach-Zehnder modulator (MZM) based systems.
    • Existing linearization techniques often require complex electrical or optical components.

    Purpose of the Study:

    • To propose and demonstrate a practical, broadband, all-optical linearization concept for MZMs.
    • To achieve record linearity in non-amplified RF photonic links.
    • To significantly improve the spurious-free dynamic range (SFDR) of optical communication systems.

    Main Methods:

    • A unique transmitter design utilizing a standard amplitude modulated (AM) MZM with two optical outputs.
    • Combining the complementary MZM output with the laser carrier to create a linearizing optical local oscillator.
    • Coherent combination of the AM signal and the optical local oscillator to cancel third-order intermodulation distortion.

    Main Results:

    • Demonstration of a practical, broadband, all-optical linearization technique for MZMs.
    • Achieved record linearity for a non-amplified RF photonic link.
    • Obtained SFDR of 118.5 dB.Hz^2/3 (single fiber/photodetector) and 123 dB.Hz^2/3 (dual fiber/photodetector).

    Conclusions:

    • The proposed all-optical linearization scheme effectively cancels third-order intermodulation distortion.
    • This method offers a significant advancement in achieving high linearity for RF photonic links.
    • The demonstrated technique provides a pathway to enhanced performance in optical communication systems.