A vertical T-electrode modulator with low-loss and high-speed

Abstract

The contradiction between the limited bandwidth of optical communication and the escalating demand for faster communication speed poses an urgent problem that needs to be addressed. To enhance the transmission bandwidth of optical communication systems and reduce transmission losses, this paper proposes a vertically structured thin film lithium niobate modulator with T-electrodes. Through simulations, the electrode's structural parameters are optimized to minimize microwave losses and increase transmission bandwidth. The results demonstrate that compared to traditional T-electrode modulators, the vertical T-electrode modulator with optimized structure parameters (t=5μm, r=45μm, s=2μm, c=5μm, h=4μm) exhibits an increased modulation bandwidth from 80GHz to 100GHz while reducing microwave loss from 0.554dB/cm/Hz 1/2 to 0.399dB/cm/Hz 1/2 . This optimization approach enables broader bandwidths and lower microwave losses in electrodes and presents a novel idea for electrode optimization in modulators.