The Research Of Silicon-Based Passive Diode,Microring And Waveguide

Nonreciprocity transmission is the basis of information processing and information machining, the electrical nonreciprocity transmission have been achieved in the form of the semiconductor PN junction, that is diode effect. The diode effect is the basic component of logic circuit, it plays an irreplaceable role in modern industry. However, the optical nonreciprocity transmission, constrained by properties such as time reversal, is difficult to achieve. To some extent, it restricts the development of all-optical logic devices. The microsring resonator not only can filter the light wave of a specific frequency, but also conducive to large scale integration because of the small radius of the microring. These special properties make microring resonator gained more and more attention.This paper studies the microring resonator model with symmetrical structure, using the finite element method and finite difference time domain method for the simulation and study of microring resonator model. And on this basis, we studied the microring radius, and the distance between the microring and vertical waveguide, and different arrangement of a microring model in the multi microring model, and so on, try to summary the different factors influence the output characteristics of the model light wave. Simulation results show that the microring resonator can filter the light wave of a specific frequency. And verify the microring radius affects the output power in periodic, spacing between the micro ring and the vertical waveguide will affect the size of the output power, spectrum center frequency and corresponding to the FWHM to certain extent. Based on the study on the basis of single microring resonator model, this paper for double microring resonator model of theoretical analysis and simulation studies proved the center frequency of the double micro ring model corresponding to the FWHM is less than single micro ring model, and validated different arrangement of the micro ring can influence the output characteristics of light wave to some extent.This paper studies the asymmetric structure of silicon-based all-optical missed diode model. On the basis of theoretical analysis, the simulation experiments by the finite element method verify the model can achieve diode function for a particular wavelength of light wave. Based on this, studying the change in the refractive index of the resonator ring to the impact on the output characteristics of the model, proving changing the refractive index of the resonator ring for a particular wavelength of light wave, to some extent will improve light wave in forward and backward transmission ratio and reduce forward transmission loss rate. Inquiry for changing the shape of the micro loop to the impact on the characteristics of the model output, verifying to some extent the change in shape can increase the forward and backward transmission ratio of the model, but it will introduce of greater forward losses.In summary, this paper used the finite element method for the microring resonator model and passive silicon-based all-optical diode model for the simulation analysis, the purpose is to explore the method of non-interactive optical transmission. We try to improve forward and backward transmission ratio for the output power of model specific wavelength, reducing the loss of light wave output power for the forward transmission, provide a theoretical basis and guidance direction for the experiment.