Evaluation of Velocity Mismatch in a Traveling-Wave Lithium Niobate Modulator Integrated with an Electro-Optic Equalizer for 100 GHz Bandwidth

We investigated the effects of velocity mismatch in a LiNbO3 modulator integrated with an electro-optic equalizer. Two types of modulator chips with different microwave refractive indices were fabricated, and their frequency dependence was experimentally evaluated. Additionally, we confirmed that our modulator has 110 GHz electro-optic bandwidth via velocity matching with high accuracy.