Opt Lett. 2022 Dec 1;47(23):6301-6304. doi: 10.1364/OL.475540.
Soliton microresonator frequency combs (microcombs) have recently emerged as an attractive new type of optical comb source with a wide range applications proposed and demonstrated. To extend the optical bandwidth of these microresonator sources, several previous studies have proposed and studied the injection of an additional optical probe wave into the resonator. In this case, nonlinear scattering between the injected probe and the original soliton enables the formation of new comb frequencies through a phase-matched cascade of four-wave mixing processes. In this work, we expand the relevant analyses to consider soliton-linear wave interactions when the soliton and the probe fields propagate in different mode families. We obtain an expression for the phase-matched idler locations as a function of the dispersion of the resonator and the phase detuning of the injected probe. We confirm our theoretical predictions in experiments performed in a silica waveguide ring microresonator.
孤子微谐振器频率梳（微梳）作为一种具有广泛应用前景的新型光学梳状源，近年来已引起广泛关注。为了扩展这些微谐振器源的光学带宽，先前的一些研究提出并研究了将额外的光探测波注入到谐振器中。在这种情况下，注入的探测波与原始孤子之间的非线性散射通过四波混频过程的相位匹配级联，实现了新梳状频率的形成。在这项工作中，我们扩展了相关分析，以考虑当孤子和探测场在不同的模式族中传播时的孤子-线性波相互作用。我们得到了相匹配的闲频位置的表达式，作为谐振器的色散和注入探测的相位失谐的函数。我们在硅波导环微谐振器中进行的实验证实了我们的理论预测。
