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Dynamic range improvement in analog photonic link by intermodulation-compensation receiver.

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    This study introduces a novel optical receiver that eliminates third-order intermodulation distortion (IMD3) in analog photonic links. The new design significantly improves spurious-free dynamic range without digital processing.

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    Area of Science:

    • Photonics and Optical Communications
    • Analog Signal Processing
    • Electronic Engineering

    Background:

    • Intensity-modulation direct-detection (IMDD) analog photonic links suffer from third-order intermodulation distortion (IMD3), limiting performance.
    • Existing linearization techniques often require complex digital signal processing, introducing quantization noise and increasing power consumption.

    Purpose of the Study:

    • To propose and demonstrate a novel intermodulation-compensation optical receiver for IMDD analog photonic links.
    • To eliminate IMD3 distortion without relying on digital processing.

    Main Methods:

    • A bias-modulated photodetector (PD) is employed to extract and cancel IMD3 distortion.
    • A low-pass optical receiver extracts nonlinear distortion, which then modulates the bias of a high-speed PD.
    • The distorted radio frequency (RF) signal is mixed with the extracted baseband signal within the PD for IMD3 cancellation.

    Main Results:

    • Successful elimination of IMD3 distortion was theoretically analyzed and experimentally demonstrated.
    • A spurious-free dynamic range (SFDR) of 123.4 dB within a 1-Hz bandwidth was achieved, showing an 18.1 dB improvement.
    • A low-biased Mach-Zehnder modulator (MZM) was utilized, maintaining a simple transmitter and enhancing link gain.

    Conclusions:

    • The proposed bias-modulated PD receiver effectively eliminates IMD3 in IMDD analog photonic links.
    • The post-linearization technique offers significant improvements in SFDR without digital processing, reducing complexity and noise.
    • This approach provides a promising solution for high-performance analog photonic systems.