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    Combined amplitude and phase shift (CAPS) codes enable 50 Gb/s optical transmission up to 20 km without dispersion compensation. This low-cost solution offers superior dispersion tolerance compared to other modulation schemes for mobile Xhaul applications.

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    Area of Science:

    • Optical communications
    • Fiber optic transmission systems

    Background:

    • Mobile Xhaul networks require high-speed, cost-effective optical interconnects.
    • Existing modulation schemes face limitations in dispersion tolerance and complexity.

    Purpose of the Study:

    • To demonstrate a novel modulation scheme for enhanced optical transmission.
    • To evaluate the performance of combined amplitude and phase shift (CAPS) codes in C-band fiber optic systems.
    • To compare CAPS signaling with other 50 Gb/s modulation formats.

    Main Methods:

    • Experimental demonstration of 50 Gb/s transmission using CAPS codes over 0-20 km single mode fiber.
    • Direct detection without digital signal processing (DSP).
    • Comparison with On-Off Keying (OOK), 4-level Pulse Amplitude Modulation (PAM4), and dispersion precompensated OOK.
    • Testing of IQ duobinary modulation format.

    Main Results:

    • Achieved 50 Gb/s transmission below a 10^-3 bit error rate (BER) up to 20 km using CAPS.
    • CAPS demonstrated superior dispersion tolerance over OOK, PAM4, and dispersion precompensated OOK.
    • Maximum bit rate of 67 Gb/s achieved with CAPS at 10 km.
    • IQ duobinary enabled 50 Gb/s over ~17 km.
    • CAPS showed low OSNR penalty in an ASE-limited regime.

    Conclusions:

    • CAPS coding offers a cost-effective, high-performance solution for mobile Xhaul applications.
    • The proposed CAPS signaling is robust against dispersion, simplifying system design.
    • CAPS outperforms other tested modulation schemes in terms of dispersion tolerance and reach.