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Writing Bragg Gratings in Multicore Fibers
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Crosstalk dynamics in multi-core fibers.

Georg Rademacher, Ruben S Luís, Benjamin J Puttnam

    Optics Express
    |August 10, 2017
    PubMed
    Summary

    Inter-core crosstalk in multi-core fibers varies with signal type. Carrier-free signals show stable crosstalk, while carrier-supported signals exhibit time-varying crosstalk power, impacting data rates.

    Area of Science:

    • Optical Communications
    • Fiber Optics
    • Signal Processing

    Background:

    • Inter-core crosstalk limits data rates in multi-core fiber systems.
    • Crosstalk power fluctuations can necessitate performance margins for reliable transmission.
    • Previous studies primarily examined crosstalk from continuous wave or amplified spontaneous emission sources.

    Purpose of the Study:

    • To investigate the time-dependence of inter-core crosstalk in homogeneous multi-core fibers.
    • To analyze the impact of different modulation formats and symbol rates on crosstalk.
    • To understand crosstalk behavior for both carrier-free and carrier-supported signals.

    Main Methods:

    • Theoretical modeling of inter-core crosstalk.
    • Experimental investigation using homogeneous multi-core fibers.

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  • Analysis of signals with various modulation formats (e.g., OOK, QAM) and symbol rates.

    • Main Results:

    • Crosstalk power fluctuations are dependent on symbol rate, modulation format, and core skew.
    • Carrier-free signals (e.g., QAM) result in nearly constant crosstalk power under typical conditions.
    • Carrier-supported signals (e.g., OOK) consistently induce time-varying crosstalk powers.

    Conclusions:

    • The time-dependence of inter-core crosstalk is a critical factor for multi-core fiber transmission systems.
    • Signal characteristics significantly influence crosstalk behavior, affecting system performance.
    • Understanding these dynamics is essential for optimizing data rates and ensuring signal integrity in future optical networks.