Analysis and Design of High-Accuracy Driving Circuit for Wideband Phase Modulators

Currently, wideband integrated optical phase modulators are available in several types such as silicon modulators, polymer modulators, and lithium niobate modulators [1], [2]. Among these, Lithium niobate (LiNbO3) phase modulators are particularly noteworthy due to their extensive applications in the fields of fiber optic communication, microwave photonics, and fiber optic sensing [3]–[5]. Designing corresponding high-precision phase modulator driver circuits is crucial to achieve accurate modulation of optical phase. Nonetheless, due to the impact of structure asymmetry, electronic noise and weak interference immunity, traditional phase modulator driving circuits cannot ensure the driving voltage sequences applied to the two electrodes strictly align. It could cause phase deviation in actuality and reduce the modulation accuracy.