Tricomb spectroscopy unveils a new dimension to standard linear and nonlinear spectroscopic analysis, offering the possibility to reveal the almost real-time evolution of complex systems with unprecedented accuracy. Current triple comb configurations are based on the use of mode-locked lasers, which impose constraints on the comb parameters, and require complex electronic synchronization, thus limiting potential applications. In this paper, we present the experimental demonstration of a new type of all-fiber, self-phase-locked, frequency-agile tri-comb light source. It is based on the nonlinear spectral broadening of three electro-optic modulator-based frequency combs in a three-core fiber. The exploitation of spatial multiplexing of light in optical fibers offers new possibilities to generate broadband-frequency combs that are highly coherent with each other. After characterizing the stability of the source and performing several dual-comb test measurements, we revealed the high mutual coherence between the three combs through the demonstration of a 2-D pump-probe four-wave mixing spectroscopy experiment.

特里科姆光谱揭示了标准线性和非线性光谱分析的新维度，提供了以前所未有的精度揭示复杂系统几乎实时演化的可能性。目前的三梳配置基于锁模激光器的使用，这对梳参数施加了限制，并且需要复杂的电子同步，从而限制了潜在的应用。在本文中，我们展示了一种新型全光纤、自锁相、频率捷变三梳光源的实验演示。它基于三芯光纤中三个基于电光调制器的频率梳的非线性光谱展宽。光纤中光的空间复用的利用为生成彼此高度相干的宽带频率梳提供了新的可能性。在表征源的稳定性并进行多次双梳测试测量后，我们通过二维泵浦探针四波混合光谱实验的演示揭示了三个梳之间的高度相互相干性。