Abstract :
Analysis and optimization of an ultra-high-speed Z-cut lithium niobate (LN) electrooptic modulator, operating at a high-frequency region, by using a full-wave finite-element numerical technique, has been demonstrated. Investigation of the effects of adjusting the buffer layer thickness, the electrode height, the electrode trapezoidal profile, and the waveguide trapezoidal profile on the microwave effective index Nm, the characteristic impedance Zc, the microwave losses alphac, and the half-wave voltage-length product VpiL has been reported. Optimization of these parameters yield to a novel design of the LN modulator, with a low VpiL and a high bandwidth, operating at a frequency range between 1 and 100 GHz. The frequency-dependent dispersion of the key device parameters, with the aim of determining the device suitability for high-speed operation, has been demonstrated.
Keywords :
electro-optical modulation; integrated optics; lithium compounds; optical communication; optimisation; LiNbO3; Z-cut lithium niobate electrooptic modulator; buffer layer thickness; characteristic impedance; design optimization; electrode height; electrode trapezoidal profile; frequency 1 GHz to 100 GHz; integrated optics; metal electrodes; microwave effective index; microwave losses; optical communications; waveguide trapezoidal profile; waveguides; Buffer layers; Design optimization; Electrodes; Electrooptic modulators; Electrooptical waveguides; Finite element methods; Frequency; Impedance; Lithium niobate; Voltage; Electrooptic modulator; full wave; integrated optics; lithium niobate (LN); optical communications;
