Based On The Total Internal Reflection Sion/polymer Hybrid Integrated Type Thermal Optical Switch

Along with the social and personal growing demand of communication capacity,all optical network keeps continuous development and the demands for the transportnetwork in the aspect of speed, capacity, network protect and recovery are much higher.Optical switch is an important device of optical switching system, so its speed, power,reliability and so on are all will impact the optical network. Comparing with themechanical optical switch, the total-internal-reflection (TIR) waveguide optical switchpossess many advances, so it is hope to meet the optical switching system’s demand.In the past decades, with the development of the polymer material which is cheap,fabrication easily and has a high thermo-optic (TO) coefficient, the TO switch based onTIR is widely researched. However, as far as reported, due to the high powerconsumption of electrode, the thermo-optic switches are all unable to meet the businessrequirement. In order to solve the problem, this dissertation proposes a novel hybridintegrated waveguide TIR thermo-optic switch by utilizing the opposite thermo-opticalcharacteristic of silicon oxynitride (SiON) and polymer materials and a hybridintegrated waveguide TIR thermo-optic switch is designed. This main work includes thefollowing three parts:First，the structure of the optical switch we proposed is introduced, which has ahard core of an X-junction waveguide structure, a trench filled polymer is located in thecenter of the junction and a heat electrode. We get the key parameters of the designedswitch by analyzing the propagation characteristic of the incident light in the waveguideusing Fresnel principle. The results are as follows: the size of the signal modewaveguide is8.0μm×3.0μm, half of the waveguides cross angle is78°,the width ofthe trench is3.0μm, the length, width, and the depth of electode are40.0μm,8.0μmand0.2μm separately.Second, the performances of the designed switch are investageted in theory. Theabsolute value of crosstalk and extinction ration of the switch can exceed36dB for TEand TM polarization incident light when the power of heated electrode is2.3mW, andin this situation, the switch time is about1.1ms and1.4ms for TE and TM polarization incident light. In addition, through optical simulation software OptiBPM, we simulatedthe transmission of the switch and found that it is in accord with the theoretical analysis.Finally, in order to eliminate the additional effects caused by the filled polyerwhich is same with the cladding of waveguide, we propose another method in the forthchapter, insteading of filling the same material with the cladding of waveguide in thetrench, it filled another polymer material that has the same refractive index with SiON.We finished the design of the switch, analysis of the performances in this scheme andcompared the switches in the two kinds of design scheme.The optical switch proposed in this dissertation can decrease the powerconsumption and possess a simple structure, without the need for additionaloptimization design.