Automatic phase-matching technique for cascaded electro-optic frequency combs

We propose a novel automatic phase-matching method for generating optical frequency combs using cascaded electrooptic modulators. By analyzing the power changes of different spectral lines, our method enables real-time monitoring and dynamic adjustment to achieve precise phase matching. Experiments have confirmed the fast phase matching and the adjustable spacing of a flat electro-optic frequency comb and its long-term stability. This method provides flexible and efficient light source solutions for optical communications, spectral analysis, and optical measurements.