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Optical format interconversion nodes between OOK and QPSK enabled by a reconfigurable two-dimensional vector mover.

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    This study introduces a novel optical conversion system for seamless interconversion between on-off keying (OOK) and quadrature phase shift keying (QPSK). The proposed method achieves error-free signal conversion, enabling flexible optical communications.

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    Area of Science:

    • Optical communications engineering
    • Photonics and optoelectronics

    Background:

    • Optical modulation formats like on-off keying (OOK) and quadrature phase shift keying (QPSK) are fundamental in optical communications.
    • Efficient interconversion between different modulation formats is crucial for flexible optical network architectures.

    Purpose of the Study:

    • To propose and experimentally validate a novel scheme for optical format interconversion between OOK and QPSK.
    • To demonstrate a flexible and efficient method for achieving one-to-one OOK-QPSK conversion.

    Main Methods:

    • Development of a conversion system utilizing a coherent vector combiner and a reconfigurable two-dimensional (2D) vector mover.
    • Implementation of the 2D vector mover using a non-degenerate phase-sensitive amplifier (PSA).
    • Analysis of PSA-based 2D vector mover characteristics and validation through signal constellation, eye diagrams, and bit error ratio measurements.

    Main Results:

    • Error-free conversion between 50G Baud OOK and QPSK achieved at signal-to-noise ratios of 20 dB and 25 dB.
    • Demonstration of the reconfigurable transfer characteristics of the 2D vector mover for flexible signal manipulation.
    • Comprehensive validation of the proposed scheme using various optical signal quality metrics.

    Conclusions:

    • The proposed optical format interconversion scheme effectively bridges the gap for one-to-one OOK-QPSK conversion.
    • This technology holds significant potential for applications in optical interconnect nodes, across-dimensional optical transmissions, and flexible optical transceivers.