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    This study introduces a new Alamouti-coded coherent algorithm that simplifies digital signal processing (DSP) for high-speed optical communication systems. The novel algorithm achieves similar performance with half the complexity, enabling efficient data recovery.

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    Area of Science:

    • Optical Communications
    • Digital Signal Processing

    Background:

    • Alamouti-coded polarization-time block code (A-PTBC) enables phase-diverse coherent detection without polarization tracking.
    • High-speed single-carrier systems face challenges with complex DSP algorithms for data recovery.

    Purpose of the Study:

    • To propose a novel Alamouti-coded coherent algorithm to reduce receiver DSP complexity.
    • To enable efficient data recovery in high-speed single-carrier systems.

    Main Methods:

    • Developed a novel Alamouti-coded coherent algorithm.
    • Reduced the number of equalizers required for data recovery by half.
    • Validated performance through simulations and experimental demonstration.

    Main Results:

    • The proposed algorithm achieves comparable performance to conventional methods.
    • Requires only half the number of equalizers for data recovery.
    • Demonstrated a 100 Gb/s 16-QAM system over 20 km SMF with a 34 dB power budget.

    Conclusions:

    • The novel algorithm significantly reduces DSP complexity in coherent optical systems.
    • Enables efficient and comparable performance in high-speed single-carrier systems.
    • The proposed method is suitable for 100 Gb/s systems over standard single-mode fiber.