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40-Gbitys cascadable all-optical logic with an ultrafast nonlinear interferometer.

N S Patel, K L Hall, K A Rauschenbach

    Optics Letters
    |November 3, 2009
    PubMed
    Summary

    Researchers developed an ultrafast nonlinear interferometer for all-optical bitwise inversion and wavelength conversion at 40 Gb/s. This semiconductor amplifier-based device enables high-speed optical switching and logic operations like OR and NOR gating.

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    Area of Science:

    • Photonics and Optical Communications
    • Semiconductor Device Physics
    • Nonlinear Optics

    Background:

    • High-speed optical signal processing is crucial for next-generation communication networks.
    • Existing methods for all-optical switching often face limitations in speed, cascadability, or functionality.
    • Semiconductor optical amplifiers offer potential for fast all-optical switching due to their nonlinear properties.

    Purpose of the Study:

    • To demonstrate a novel all-optical device for high-rate bitwise inversion and wavelength conversion.
    • To investigate the use of optically induced nonlinearities in semiconductor amplifiers for ultrafast switching.
    • To showcase the device's versatility by configuring it for logic gating operations.

    Main Methods:

    • Utilized an ultrafast nonlinear interferometer architecture.

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  • Employed a semiconductor amplifier exhibiting optically induced gain and index nonlinearities.
  • Tested the device for bitwise inversion and wavelength conversion at 40 Gb/s.
  • Demonstrated 10 Gb/s OR and NOR logic gating functionalities.

    • Main Results:

    • Successfully achieved all-optical bitwise inversion at 40 Gb/s.
    • Demonstrated all-optical wavelength conversion at 40 Gb/s.
    • Confirmed the cascadability of the nonlinear interferometer.
    • Presented 10 Gb/s OR and NOR logic gate operations.

    Conclusions:

    • The ultrafast nonlinear interferometer is a viable platform for high-speed all-optical signal processing.
    • Optically induced nonlinearities in semiconductor amplifiers enable efficient and fast all-optical switching.
    • The device's cascadability and reconfigurability offer flexibility for various optical switching and logic functions.