- A Design of Ti:LiNbO3 Optical Polarization Controller with Ridge Structures
- Mun, Chun Gi ; Yu, Jae Wang ; Heo, Hyeon ; Ban, Jae Gyeong ;
- The Journal of Korean Institute of Communications and Information Sciences, volume 24, issue 1A, 1999, Pages 153~153
Abstract
In this paper, a ridge type polarization controller which has merits of low drive voltage and wide bandwidthto coplanar waveguide type, is proposed. The Ti:LiNb03 ridge waveguide is applied to the conventional polarization controller The drive voltage and bandwidth of the device are dependent on the microwave characteristics of electrodes and the relative structure between the waveguides and electrodes. So, the characteristic impedance and microwave effective index of the device have been calculated by the various design factors, which are electrode gap, electrode thickness and ridge depth, using FEM(Finite Element Method) numerical analysis tool. The overlap integral factor between the guided wave and the external electric field has also been calculated in order to obtain the value of drive voltage. for wider bandwidth and lower drive voltage, the polarization controller has to be designed to have deep ridge, narrow?electrode gap, and thick electrodes. For the drive voltage with various ridge depth, it is shown that the drill? voltage is decreased as the ridge depth increases and that the drive voltage of the proposed polarization controller Is lower than that of coplanar type.