Numerical Analysis of Polarization Splitter Based on Vertically Coupled Microring Resonator
A novel polarization splitter which exploits the strong polarization dependence of vertical coupled microring resonator is presented. Based on a combination of a three dimensional, full vectorial film mode matching method (FMM) with a three dimensional full vectorial coupled mode theory (CMT), the device performance of vertically coupled microring resonator is rigorously investigated. Three steps are taken to model the structure: First, the propagation constants and the eigenmodes of straight and bent waveguides are computed using FMM; second, the scattering matrix describing the behavior of coupling region is obtained by means of CMT;and finally the spectral responses of microring resonator for TE and TM mode are calculated. By this method, one obtains a complete three dimensional vectorial microring resonator description without any freee parameters, which permits a convenient investigation of the influence of geometrical parameters on the spectral response. The calculated result shows that the response of microring resonator is indeed strongly polarization dependent and the resonance wavelengths are different for the two polarizations. The resonance wavelengths of the two orthogonal polarization states are different because of the difference in modal index and scattering matrix for different polarizations, hence the different polarized light can be transferred to different output port at specific wavelength. Such property allows for the design of integrated polarization splitter. The investigation of the influence of geometrical parameters on splitting ratio demonstrated that a splitting ratio greater than 20 dB at 1.55 μm can be achieved in this device.
Xinlun Cai Siyuan Yu Dexiu Huang
Department of Electrical & Electronic Engineering,University of Bristol,UK;Wuhan National Laboratory Department of Electrical & Electronic Engineering,University of Bristol,UK Wuhan National Laboratory for Optotelectronics,China
国际会议
Progress in Electromagnetics Research Symposium 2008(2008年电磁学研究新进展学术研讨会)(PIERS 2008)
杭州
英文
1-6
2008-03-24（万方平台首次上网日期，不代表论文的发表时间）