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  11. Joint Signal-to-signal Beat Interference Mitigation For The Field Recovery Of Symmetric Carrier-assisted Differential Detection With Low Carrier-to-signal Power Ratio

Joint signal-to-signal beat interference mitigation for the field recovery of symmetric carrier-assisted differential detection with low carrier-to-signal power ratio

Zihua Huang, Jianping Li, Xinkuo Yu

    Optics Express
    |June 11, 2024

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    View abstract on PubMed

    Summary
    This summary is machine-generated.

    This study introduces a novel digital pre-distortion and clipping scheme to reduce the required carrier-to-signal power ratio (CSPR) for self-coherent detection in optical communications. The new method improves performance in symmetric carrier-assisted differential detection (S-CADD) systems, enabling lower CSPR for forward error correction.

    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Self-coherent detection offers cost advantages and optical field recovery but is often limited to single sideband (SSB) signals.
    • Carrier-assisted differential detection (CADD) and symmetric CADD (S-CADD) enable double sideband (DSB) signals but require high carrier-to-signal power ratios (CSPR) to mitigate signal-to-signal beat interference (SSBI).

    Purpose of the Study:

    • To propose and validate a novel scheme combining digital pre-distortion (DPD) at the transmitter and clipping at the receiver to reduce the CSPR requirements in S-CADD systems.
    • To address non-uniform subcarrier signal-to-noise ratio (SNR) distribution and error propagation issues in low-CSPR scenarios.

    Main Methods:

    • A joint digital pre-distortion (DPD) and receiver clipping technique was implemented.
    • The proposed scheme was experimentally validated using a 64 Gbaud 16-ary quadrature amplitude modulation (16-QAM) orthogonal frequency division multiplexing (OFDM) signal transmitted over 80 km of standard single mode fiber (SSMF).

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    Main Results:

    • The proposed scheme reduced the required CSPR by 1.3 dB for 20% soft-decision forward error correction (SD-FEC) and 2.8 dB for 7% hard-decision forward error correction (HD-FEC) compared to conventional S-CADD.
    • The joint processing effectively mitigated SSBI and improved SNR distribution under low CSPR conditions.

    Conclusions:

    • The developed DPD and clipping scheme significantly lowers CSPR requirements for S-CADD systems.
    • This approach demonstrates potential for enhancing the performance and cost-effectiveness of short-reach optical transmission systems.