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Carrier assisted differential detection with a generalized transfer function.

Honglin Ji, Miao Sun, Chuanbowen Sun

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    |December 31, 2020
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    Summary
    This summary is machine-generated.

    Carrier assisted differential detection (CADD) was enhanced using microring resonator filters, significantly improving optical communication sensitivity and reach. This advancement offers a novel approach for high spectral efficiency transmission in data centers and mobile networks.

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    Area of Science:

    • Optical Communications
    • Photonics
    • Signal Processing

    Background:

    • Direct detection (DD) enables high spectral efficiency (SE) and extended reach via digital compensation of linear impairments.
    • Carrier assisted differential detection (CADD) bridges the gap between DD and coherent detection for complex-valued double-sideband signals.
    • Conventional CADD has limitations in sensitivity and interference suppression.

    Purpose of the Study:

    • To generalize the transfer functions used in CADD beyond the delay interferometer.
    • To validate the proposed CADD approach using a silicon photonics microring resonator (MRR) based optical filter.
    • To improve receiver sensitivity and spectral efficiency in optical communication systems.

    Main Methods:

    • Extended CADD concept to a general selection of transfer functions.
    • Implemented a microring resonator (MRR) based optical filter as a generalized transfer function.
    • Evaluated the performance in terms of carrier-to-signal power ratio (CSPR) and optical signal-to-noise ratio (OSNR) sensitivity.

    Main Results:

    • The MRR-based CADD drastically improved CSPR and OSNR sensitivity compared to conventional CADD.
    • Significantly suppressed signal-signal beating interference (SSBI) was achieved with the MRR filter.
    • The proposed CADD demonstrated resilience to wavelength offsets up to several GHz.

    Conclusions:

    • The generalized CADD with an MRR-based transfer function offers a novel approach for high-SE optical transmission.
    • This method provides superior receiver sensitivity and is potentially valuable for inter-/intra-datacenter and mobile front haul applications.
    • The enhanced CADD overcomes limitations of previous methods, paving the way for more efficient optical networks.