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LFMTS-assisted reflection interference elimination method for a coherent same-wavelength bidirectional optical

You Wang, Wei Li

    Optics Express
    |July 16, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method using linear frequency modulated training sequences (LFMTS) to eliminate reflection interference (RI) in optical systems. The technique effectively removes RI, as validated by simulations and experiments in a high-speed communication system.

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    Area of Science:

    • Optical communications
    • Signal processing
    • Photonics

    Background:

    • Reflection interference (RI) is a significant challenge in optical systems, degrading signal quality.
    • Existing RI elimination methods may have limitations in complex or high-speed scenarios.
    • The need for robust and effective RI mitigation techniques is crucial for advancing optical communication performance.

    Purpose of the Study:

    • To propose and validate a novel method for eliminating reflection interference (RI) in optical systems.
    • To utilize linear frequency modulated training sequences (LFMTS) for effective RI reconstruction and removal.
    • To analyze the impact of critical system parameters on the performance of the proposed RI elimination technique.

    Main Methods:

    • A new RI elimination approach employing three linear frequency modulated training sequences (LFMTS).
    • Electrical domain mixing of LFMTS with the signal prior to external cavity laser modulation.
    • Digital signal processing for time mismatch identification and carrier recovery of the RI using LFMTS.

    Main Results:

    • Simulations demonstrated the method's effectiveness under various conditions, including time mismatch, bandwidth limitations, laser linewidth, and frequency differences.
    • Experimental validation on a 21-GBaud Quadrature Phase Shift Keying (QPSK) system confirmed successful RI elimination.
    • Both simulation and experimental results conclusively proved the efficacy of the proposed LFMTS-based RI elimination method.

    Conclusions:

    • The proposed LFMTS-based method offers an effective solution for reflection interference elimination in optical systems.
    • The technique is robust and performs well even with critical parameter variations.
    • This advancement contributes to improving the reliability and performance of high-speed optical communication systems.