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Bragg-grating-enhanced polarization instabilities.

R E Slusher, S Spälter, B J Eggleton

    Optics Letters
    |December 8, 2007
    PubMed
    Summary
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    Optical pulses near a fiber Bragg grating's photonic bandgap edge show significantly reduced polarization instability. This phenomenon is driven by amplified nonlinear interactions and birefringence effects, crucial for understanding light propagation in such structures.

    Area of Science:

    • Photonics
    • Nonlinear Optics
    • Fiber Optics

    Background:

    • Fiber Bragg gratings create photonic bandgaps, influencing light propagation.
    • Polarization instability can occur in nonlinear optical systems.
    • Understanding these effects is key for optical communication and sensing.

    Purpose of the Study:

    • To investigate the polarization-instability threshold in fiber Bragg gratings.
    • To analyze the role of nonlinear interactions and birefringence near the photonic bandgap edge.
    • To model and understand the observed phenomena using numerical simulations.

    Main Methods:

    • Experimental tuning of optical pulse wavelength near the photonic bandgap edge.
    • Coupled-mode numerical simulations to model light-matter interactions.

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  • Analysis of polarization-instability threshold, nonlinear effects, and birefringence.

    • Main Results:

    • A dramatic decrease in the polarization-instability threshold was observed.
    • Nonlinear interactions and birefringent effects were significantly enhanced near the bandgap edge.
    • Nonlinearities were found to increase more rapidly than birefringence as the wavelength approached the bandgap edge.

    Conclusions:

    • The proximity of optical pulses to the photonic bandgap edge of fiber Bragg gratings drastically reduces polarization instability.
    • Enhanced nonlinear interactions dominate over effective birefringence in this regime.
    • These findings are critical for designing and optimizing fiber-based photonic devices.