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Pump-linewidth-tolerant wavelength multicasting using soliton Kerr frequency combs.

Peicheng Liao, Changjing Bao, Arne Kordts

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    This study shows microresonator Kerr combs enable pump-linewidth-tolerant wavelength multicasting. This method preserves signal quality even with broad pump linewidths, unlike traditional methods.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Nonlinear Optics

    Background:

    • Wavelength multicasting is crucial for optical communication networks.
    • Traditional multicasting methods suffer from increased signal linewidth and degraded performance when using free-running (FR) pumps.
    • Microresonator-based soliton Kerr frequency combs offer a potential solution for high-quality signal generation.

    Purpose of the Study:

    • To experimentally demonstrate pump-linewidth-tolerant wavelength multicasting using microresonator-based soliton Kerr frequency combs.
    • To compare the performance of Kerr comb-based multicasting with conventional FR pump-based multicasting.
    • To evaluate the error-free multicasting capability of high-baud-rate signals with broad pump linewidths.

    Main Methods:

    • Utilizing microresonator-based soliton Kerr frequency combs as coherent pumps.
    • Employing a periodically poled lithium niobate waveguide for wavelength conversion.
    • Measuring signal linewidth and error vector magnitude (EVM) for different pump linewidths.
    • Testing 10 Gbaud 16-quadrature amplitude modulation (16-QAM) signals.

    Main Results:

    • The linewidth of the multicast signal remained close to the original signal's linewidth (100 kHz to 1 MHz) when using Kerr comb pumps.
    • Conventional multicasting with FR pumps resulted in a significant increase in signal linewidth.
    • Eight-fold error-free multicasting of 10 Gbaud 16-QAM signals was achieved with Kerr comb linewidths up to 1 MHz, without receiver-side filtering.
    • EVM performance degraded significantly when using an FR laser as a pump.

    Conclusions:

    • Microresonator-based soliton Kerr frequency combs provide robust wavelength multicasting tolerant to pump linewidth variations.
    • This technique significantly outperforms conventional FR pump-based multicasting in terms of signal quality preservation.
    • The demonstrated method enables high-performance, error-free multicasting of complex modulation formats even under challenging pump conditions.