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Related Experiment Video

Updated: Jun 22, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Simple nonlinear interferometer-based all-optical thresholder and its applications for optical CDMA.

Konstantin Kravtsov, Paul R Prucnal, Mikhail M Bubnov

    Optics Express
    |June 25, 2009
    PubMed
    Summary
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    We demonstrated an ultrafast all-optical thresholder using a nonlinear Sagnac interferometer. This device operates with low nonlinearity, offering advantages for optical CDMA communication systems.

    Area of Science:

    • Photonics and Optical Engineering
    • Nonlinear Optics
    • Optical Communications

    Background:

    • Ultrafast optical signal processing is crucial for high-speed communication.
    • Nonlinear optical devices are key components in advanced optical systems.
    • Existing thresholders often require high nonlinearity or have limitations in multi-wavelength operation.

    Purpose of the Study:

    • To experimentally demonstrate an ultrafast all-optical thresholder.
    • To achieve thresholding operation with very small nonlinear phase shifts.
    • To develop a polarization-insensitive, multi-wavelength compatible thresholder for optical CDMA systems.

    Main Methods:

    • Utilizing a nonlinear Sagnac interferometer as the core device.
    • Employing a short length (15 meters) of conventional silica fiber as the nonlinear element.

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  • Operating the device at very small in-loop nonlinear phase shifts.

    • Main Results:

    • Successful experimental demonstration of an ultrafast all-optical thresholder.
    • Achieved polarization insensitivity and suitability for multi-wavelength operation.
    • Observed a cubic transfer function, outperforming quadratic transfer functions of other thresholders.

    Conclusions:

    • The proposed nonlinear Sagnac interferometer-based thresholder is effective for ultrafast all-optical signal processing.
    • The design meets critical requirements for autocorrelation detection in optical CDMA systems.
    • The cubic transfer function offers superior performance compared to existing thresholder technologies.