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Optically synchronized unidirectional optical amplifier-based coherent optical fiber links.

Ziang Qiu, Rong Li, Liang Hu

    Optics Letters
    |May 15, 2024
    PubMed
    Summary

    A new unidirectional transmission-based bidirectional erbium-doped fiber amplifier (UTB-EDFA) suppresses phase noise and improves net gain in coherent optical links. This advancement enhances performance for ultra-long fiber networks.

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    Area of Science:

    • Optical Engineering
    • Telecommunications
    • Fiber Optics

    Background:

    • Coherent optical fiber links require high-performance amplifiers to manage signal integrity.
    • Conventional bidirectional amplifiers face challenges with phase noise and gain optimization.
    • Uncorrelated phase noise between amplifier paths degrades signal quality in bidirectional systems.

    Purpose of the Study:

    • To develop a novel bidirectional erbium-doped fiber amplifier (EDFA) for enhanced coherent optical fiber links.
    • To suppress uncorrelated phase noise between bidirectional amplifier paths.
    • To achieve higher net gain and improved performance in ultra-long fiber networks.

    Main Methods:

    • Implementation of a unidirectional transmission-based bidirectional EDFA (UTB-EDFA).
    • Application of an optical phase-locked loop (OPLL) to link two unidirectional EDFAs (Ui-EDFAs).
    • Independent gain optimization for bidirectional transmission paths.

    Main Results:

    • Significant suppression of uncorrelated phase noise between Ui-EDFA paths.
    • Demonstrated higher net gain compared to conventional single-path bidirectional EDFA (SPBA) systems.
    • Reduced fractional frequency instability by 26.3% in a 100 km two-way optical frequency comparison system.

    Conclusions:

    • The UTB-EDFA technique effectively suppresses phase noise and enhances net gain.
    • This method offers superior performance for asymmetrical and ultra-long fiber links.
    • The UTB-EDFA technology is crucial for advancing large-scale fiber network applications.