Study On A Novel Structure Of Optical Waveguide Microring Resonator

Microring resonator is an important multi-functional integrated optical device.It can not only be used in the field of optical communication and optical information processing to realize important functions such as optical filtering,optical switching,optical modulation,optical delay,and the generation of optical frequency comb,but also be used in the field of optical sensor to achieve compact and high sensitivity sensor because of its sensitivity to wavelength.In addition to the diversity of functions,the microring resonator has the advantages of small size,high sensitivity,easy tuning,and easy integration.Microring resonator has attracted much attention due to its excellent performances.Various configurations of microring resonators,including cascaded multi-ring,cascaded microring resonators and Mach-Zehnder interferometers,cascaded microring resonators and Fabry-Perot interferometers,have been proposed.At the same time,the research on various applied research of microring resonators has also continued to advance.As far as the application of microrings in the field of sensor is concerned,it is generally desired that there is a large interaction length between microring waveguide and analyte to be sensed(usually liquid or gas)to increase the sensitivity of the sensor.However,this will result in that the perimeter of the microring becomes longer,which will significantly reduce the free spectral range(FSR)and ultimately reduce the sensing range.Therefore,it is necessary to study how to increase the perimeter of the microring,while ensuring that the microring can achieve a larger FSR.In addition,in order to miniaturize the device,it is also necessary to study how to reduce the size of the device.In view of this application background,this dissertation proposed a novel structure of dual-ring resonance optical waveguide microring resonator.The main contents of the dissertation are as follows:Aiming at the proposed novel structure optical waveguide microring resonator based on dual-ring resonator,the mathematical model of its transmission function is established by the signal flow graph method,and analyzed the transmission characteristics of the microring resonator.Compared with the traditional single microring resonator with the same structural parameters,it is theoretically confirmed that the proposed dual-ring resonant microring resonator can increase the FSR,which lays the foundation for further research on the application of the dual-ring resonator.Next,the thermo-optic tuning characteristics and temperature sensing performance of the device are theoretically analyzed,and the ideas for improving sensing performance are also discussed.The device is designed and fabricated with polymer optical waveguide materials,and the proposed novel structure optical waveguide microring resonator has achieved the desired results in theory and has been further verified experimentally.The thermo-optical tuning characteristics and temperature sensing function of the proposed novel structure optical microring resonator has been experimentally studied,and the potential of the device in realizing a large measurement range and high sensitivity sensing has been proved.The sensitivity of the experimental dual-ring temperature sensor is 147 pm/?,and the measurement range is 31.5 ?.The sensitivity of thermo-optic tuning is 57 pm/mW.