Analysis And Research On Coupling And Characteristics Of Microring Resonators

With the development of technology, information processing has become increasingly demanded. Due to various restrictions electrical interconnection can’t meet people’s needs. With various advantages of optical interconnects, electrical interconnection has been gradually replaced. Optical interconnects becomes the majority of scientists hotspot. As one of the representatives of optical devices, microring resonator is of great importance to scientific research institutions at home and abroad. In recent years, more and more researches about microring resonator have been made. Since the optical devices based on microring resonator has been increasingly such as optical router, guiding logic devices and filters, the numerical simulation work of microring resonator is necessary.By researching the output characteristics of micro-ring resonator and the coupling between the waveguides in this thesis, more accurate coupling coefficient and relationship between structure parameters and output characteristics are provided. Based on simulating the output characteristics of "Ding" shaped micro-ring resonator, the corresponding structure parameters could be exacted. The main contents are as follows:(1) The basic theory of micro-ring resonator is researched and the physical model of basic elements is analyzed. Methods to analyze micro-ring resonator are also provided in this thesis. Transmission line and directional coupler are basic elements of microring resonator. Based on the transmission matrix of transmission line and directional coupler, transmission characteristics of the micro-ring resonator could be described.(2) Output characteristics of the micro-ring resonator devices are analyzed. Based on the research of microring resonators basic model and working principle, output characteristics of device are simulated in thesis, including single-ring-single-waveguide microring resonator, single-ring-double-waveguide microring resonators and cascading microring resonator. In this process, output characteristics of the device would be analyzed by changing major device parameters, such as microring influence radius, coupling coefficient, ring-way transmission coefficient and the distance between waveguides.(3) In this thesis, transmission matrix, coupled mode theory and other research methods are combined to analyze and simulate the coupling between waveguides. This part includes two structures:straight-straight coupler and bend-bend coupler. In this procedure, relationship between structural parameters of waveguides and coupling coefficient and relationship among waveguide spacing, bending radius and the coupling coefficient are pointed out.(4) "Ding" shaped microring resonator is simulated. In this thesis, start with the working principle of the device, the device is modeled. By getting the numerical range, rough simulation of the output characteristics can be got. By the relationship among the device parameters, structural parameters and output characteristics of the device, the spectrum could be fine adjusted. Parameters of the device are repeatedly adjusted to make the analog output profiles of the device closer and closer to the experimental results. At last, the main structural parameters of the device could be extracted.Through the work of this thesis, relationship between structure parameters and output characteristics and coupling coefficient varies with the device structure could be obtained. Numerical simulation of micro-ring resonator is improved, and a new way to study microring resonator is provided.