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Demonstration of optical pattern matching between two QPSK data channels using nonlinear wave mixing.

Abdulrahman Alhaddad, Wing Ko, Amir Minoofar

    Optics Letters
    |October 1, 2025
    PubMed
    Summary

    This study demonstrates optical pattern matching for Quadrature-Phase-Shift-Keying (QPSK) data using nonlinear wave mixing. The method achieves error-free matching of 2-symbol patterns between independent QPSK signals.

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    Area of Science:

    • Optical Communications
    • Nonlinear Optics
    • Signal Processing

    Background:

    • Optical signal processing enables high-speed data handling, avoiding costly conversions.
    • Quadrature-Phase-Shift-Keying (QPSK) is crucial for efficient and noise-tolerant optical data encoding.
    • Pattern matching is vital for network security and data transmission enhancement.

    Purpose of the Study:

    • To experimentally demonstrate optical pattern matching between two independent QPSK data streams.
    • To utilize nonlinear wave mixing for direct comparison of optical data patterns.
    • To assess the feasibility of this technique for secure and efficient optical networking.

    Main Methods:

    • Combining two independent QPSK data channels and their delayed copies with a continuous wave pump.
    • Utilizing a highly nonlinear fiber (HNLF) to induce four-wave mixing.
    • Generating a 9-ary quadrature amplitude modulation (9-QAM) output signal encoding pattern matching results.

    Main Results:

    • The 9-QAM output constellation accurately represents matched, partially matched, and mismatched 2-symbol patterns.
    • Achieved error-vector-magnitude below 9% at data rates of 3-Gbaud and 5-Gbaud.
    • Demonstrated error-free optical pattern matching for sequences of 1536 symbols.

    Conclusions:

    • Nonlinear wave mixing in HNLF provides an effective method for optical pattern matching of QPSK signals.
    • The proposed technique supports high-speed, error-free pattern matching, crucial for advanced optical networks.
    • This approach offers a promising solution for enhancing security and data integrity in optical communication systems.