标题： 基于微谐振器的锁模暗脉冲Kerr频梳的高阶相干通信 显示英文标题

标题： High-order coherent communications using mode-locked dark-pulse Kerr combs from microresonators

摘要： 微谐振器频率梳利用集成光学腔中的非线性克尔效应生成大量相位锁定的频率线。 线间距可以达到100 GHz量级，使其成为光纤通信应用中具有吸引力的多波长光源。 根据微谐振器的色散特性，已经观察到不同的物理动力学现象。 最近发现的一种梳状结构对应于正常色散微腔中模式锁模暗脉冲的形成。 这种暗脉冲梳特别适用于先进的相干通信，因为它们表现出异常高的功率转换效率。 在这里，我们报告了首次使用64正交幅度调制编码在暗脉冲梳的频率线上的相干传输实验。 梳状结构的高转换效率使得传输的光信噪比超过33 dB，同时保持与最先进的混合硅激光器兼容的激光泵浦功率水平。 显示英文摘要

摘要： Microresonator frequency combs harness the nonlinear Kerr effect in an integrated optical cavity to generate a multitude of phase-locked frequency lines. The line spacing can reach values in the order of 100 GHz, making it an attractive multi-wavelength light source for applications in fiber-optic communications. Depending on the dispersion of the microresonator, different physical dynamics have been observed. A recently discovered comb state corresponds to the formation of mode-locked dark pulses in a normal-dispersion microcavity. Such dark-pulse combs are particularly compelling for advanced coherent communications since they display unusually high power conversion efficiency. Here, we report the first coherent transmission experiments using 64-quadrature amplitude modulation encoded onto the frequency lines of a dark-pulse comb. The high conversion efficiency of the comb enables transmitted optical signal-to-noise ratios above 33 dB while maintaining a laser pump power level compatible with state-of-the-art hybrid silicon lasers.