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Optical 1-bit comparator based on two-dimensional photonic crystals.

Fariborz Parandin, Reza Kamarian, Mohamadreza Jomour

    Applied Optics
    |March 10, 2021
    PubMed
    Summary

    This study presents a compact photonic crystal optical comparator for integrated circuits. Its design enhances optical power differences, reducing bit errors for telecommunication applications.

    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Nanophotonics

    Background:

    • Comparators are crucial combinational logic circuits.
    • Existing optical comparators can be complex and bulky.
    • Miniaturization and improved performance are key for optical integrated circuits.

    Purpose of the Study:

    • To design and simulate a novel optical comparator using photonic crystals.
    • To reduce the structural complexity of optical comparators.
    • To enhance performance metrics like size and bit error rate for optical communication.

    Main Methods:

    • Design of an optical comparator utilizing photonic crystals.
    • Incorporation of point and linear defects within the photonic crystal structure.

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  • Simulation of the designed structure for performance evaluation.

    • Main Results:

    • The proposed optical comparator features a significantly small size, suitable for optical integrated circuits.
    • The design effectively increases the optical power difference between logical '0' and '1' states.
    • Reduced structural complexity achieved by avoiding ring resonators and using simple defect paths.
    • Operation confirmed at the 1.55 µm wavelength, relevant for telecommunication.

    Conclusions:

    • The developed photonic crystal optical comparator offers a compact and efficient solution.
    • The design improvements lead to reduced bit detection errors, enhancing reliability.
    • This comparator is well-suited for integration into modern optical telecommunication systems.