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Normalized pulsed energy thresholding in a nonlinear optical loop mirror.

M A Nahmias, B J Shastri, A N Tait

    Applied Optics
    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study shows a Sagnac interferometer can threshold pulse energies, suppressing low-energy pulses and normalizing high-energy ones. This nonlinear optical loop mirror approach offers energy control but may cause pulse distortion.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics
    • Optical Devices

    Background:

    • All-optical signal processing requires precise control over optical pulse characteristics.
    • Existing methods for pulse energy management can be complex or inefficient.

    Purpose of the Study:

    • To demonstrate a Sagnac interferometer's capability for pulse energy thresholding.
    • To analyze the pulse energy transfer function of a nonlinear optical loop mirror.
    • To investigate the limitations of this all-optical thresholding technique.

    Main Methods:

    • Utilizing a Sagnac interferometer with an in-loop tunable isolator and highly doped silica fiber.
    • Deriving an analytical model for the nonlinear optical loop mirror's pulse energy transfer function.
    • Analyzing the transfer function's behavior at high phase shifts.

    Main Results:

    • The Sagnac interferometer effectively thresholds pulse energies, suppressing pulses below a set threshold (T) and normalizing those above.
    • The derived analytical model shows the energy transfer function approximates a step function for phase shifts greater than π.
    • Limitations were identified, including pulse distortion in fast, nonresonant all-optical devices due to the step-function nature.

    Conclusions:

    • A Sagnac interferometer provides a novel method for all-optical pulse energy thresholding.
    • The nonlinear optical loop mirror exhibits a near step-function energy transfer, enabling pulse discrimination.
    • While effective, the technique's inherent pulse distortion necessitates careful consideration for high-speed applications.