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BER improvement in SPAD-based photon-counting optical communication system by using automatic attenuation control

Chen Wang, Jingyuan Wang, Zhiyong Xu

    Optics Letters
    |April 15, 2022
    PubMed
    Summary

    A new automatic attenuation control (AAC) technique prevents saturation in single-photon avalanche diode (SPAD) receivers. This method optimizes output counts, improving bit error rate (BER) performance in optical communication systems.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Semiconductor Devices

    Background:

    • Single-photon avalanche diode (SPAD) receivers face saturation issues, limiting their performance.
    • Maintaining optimal output counts is crucial for reliable optical communication.

    Purpose of the Study:

    • To propose and evaluate a novel automatic attenuation control (AAC) scheme for SPAD-based receivers.
    • To enhance the dynamic range and bit error rate (BER) performance of SPAD receivers.

    Main Methods:

    • Implementation of an AAC module to attenuate excess incident photons.
    • Development of a reliable AAC algorithm based on a photon-counting optical communication system's BER model.
    • Investigation of optimal attenuation factors under various operating conditions.

    Main Results:

    • The AAC technique effectively prevents SPAD receiver saturation by controlling incident photon levels.
    • Optimal attenuation factors are significantly influenced by incident optical intensity and signal-to-background ratio.
    • Bit error rate (BER) improved by 0.5 to 3 orders of magnitude at high incident optical intensities.

    Conclusions:

    • The proposed AAC technique expands the dynamic range of SPAD-based receivers.
    • AAC ensures optimal output counts, leading to improved system performance and reliability in optical communications.