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Wavelength-division multiplexing communications using integrated soliton microcomb laser source.

Yong Geng, Yanlan Xiao, Qingsong Bai

    Optics Letters
    |May 23, 2023
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    Integrated perfect soliton crystals offer a viable solution for wavelength-division multiplexed (WDM) optical communications, enabling advanced data modulation without preamplification. This technology demonstrates excellent performance for high-speed data transmission over various fiber links.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Integrated Optics

    Background:

    • Wavelength-division multiplexing (WDM) is crucial for high-capacity optical networks.
    • Kerr soliton microcombs offer potential as multi-channel laser sources.
    • Challenges include noise and power limitations of microcomb lines.

    Purpose of the Study:

    • To investigate the feasibility of using integrated perfect soliton crystals for WDM optical communications.
    • To assess the performance of these crystals as multi-channel laser sources.
    • To demonstrate advanced data modulation and transmission capabilities.

    Main Methods:

    • Utilized a distributed-feedback (DFB) laser for self-injection locking to a host microcavity to generate perfect soliton crystals.
    • Evaluated frequency and amplitude noise characteristics of the soliton crystals.
    • Performed proof-of-concept experiments for data transmission using 16-quadrature amplitude modulation (16-QAM) and 4-level pulse amplitude modulation (PAM4).

    Main Results:

    • Confirmed low noise levels in perfect soliton crystals, suitable for advanced data formats.
    • Demonstrated power boosting of microcomb lines for direct data modulation, eliminating the need for preamplification.
    • Achieved excellent data reception performance in seven-channel 16-QAM and PAM4 transmissions over various fiber link lengths.

    Conclusions:

    • Fully integrated Kerr soliton microcombs are a viable and advantageous technology for optical data communications.
    • Perfect soliton crystals can serve as efficient multi-channel laser sources for high-performance WDM systems.
    • The study validates the potential of integrated photonics for next-generation communication networks.