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Nonlinear-optical loop mirror demultiplexer using a random birefringence fiber: comparisons between simulations and

M F Arend, M L Dennis, I N Duling Iii

    Optics Letters
    |June 15, 1997
    PubMed
    Summary

    This study presents a numerical simulation of a polarization multiplexed nonlinear-optical loop mirror demultiplexer, accurately modeling random fiber birefringence to explain observed phase-dependent switching window modulations.

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    Area of Science:

    • Nonlinear Optics
    • Optical Communications
    • Computational Physics

    Background:

    • Nonlinear-optical loop mirror (NOLM) demultiplexers are crucial for optical signal processing.
    • Accurate modeling of NOLMs requires accounting for fiber birefringence.
    • Polarization multiplexing introduces complexities in NOLM operation.

    Purpose of the Study:

    • To numerically simulate and experimentally validate the switching characteristics of a polarization multiplexed NOLM demultiplexer.
    • To investigate the impact of random fiber birefringence on demultiplexer performance.
    • To explain the observed phase-dependent modulation of the switching window.

    Main Methods:

    • Numerical simulation of a NOLM demultiplexer model.
    • Incorporation of randomly varying birefringence in the optical fiber.
    • Comparison of simulation results with experimental data.
    • Analysis of factors influencing the switching window curve.

    Main Results:

    • The numerical model accurately reproduces experimental switching characteristics.
    • Random birefringence significantly affects the switching window shape and width.
    • A phase-dependent modulation of the switching window was observed and explained by incomplete polarization averaging.
    • Models neglecting random birefringence fail to capture this modulation.

    Conclusions:

    • Numerical simulations incorporating random birefringence are essential for accurately modeling polarization multiplexed NOLMs.
    • The study elucidates the physical mechanism behind phase-dependent switching window modulation.
    • This work provides a more robust model for designing and optimizing NOLM-based optical switches.