| With the rapid development of the information society,people have put forward higher requirements for the size and working speed of the devices.The development of traditional transistor devices has always followed Moore's law.But with the limitation of device size,it's a bottleneck to improve information processing speed only by reducing physical size and working frequency.The appearance of silicon based integrated photonic devices makes another solution to enhance the efficiency of information processing devices.Moreover,silicon based micro-ring resonator is the key component of integrated optical circuit,which has the advantages of low cost,compact structure and high transmission efficiency.Based on the silicon based MRR structure,the transmission characteristics of micro ring topology and microdisk structure were studied in this thesis.Combined with the structure of Bragg grating,an improved micro ring filter was proposed.Based on runway type MRR structure,the influence of voltage on transmission characteristics of devices is studied.The structure of the designed device is analyzed by the scattering matrix model,and the transmission characteristics of each structure are simulated and verified with the Comsol multi-physical simulation software.The main work is as follows:?1?Based on the micro-ring resonator,We study the propagation characteristics of the micro-ring resonator,deduce the transfer function based on the transfer matrix model theory,and simulate the optical signal propagation path and the structure of the key parameters?such as micro-ring radius,rings and the straight waveguide spacing gap?to effect on device performance.At the same time,the output spectrum of the micro-ring resonator is simulated by using the three-dimensional structure model of Comsol software,which provides the structure parameter basis for the actual manufacture of the device.The transmission function analysis and Simulation of the series parallel structure derived from the micro-ring resonator structure are also studied.?2?The structure of Bragg grating with filtering characteristics in waveguide devices is studied.Based on the existing structure,an improved Bragg grating asymmetric cladding modulation grating structure?ACMBG?is proposed.The improvement of the grating structure is based on the asymmetry of the grating tooth structure.First,the transfer function expression of the structure is derived.Secondly,a comparative analysis is made before and after the improvement of the structure.The simulation results show that the improved structure makes the grating structure weakly coupled,which reduces the grating reflection bandwidth to 0.3nm,the extinction ratio increases to 35.1dB,and the optical power dissipated to the cladding reduces to 3.13×10-5W.Finally,a micro-ring-Bragg grating resonating system is designed based on a micro-ring resonator and a Bragg grating,and its transmission characteristics are studied.The simulation shows that the 3dB bandwidth of the resonant system can reach 0.3nm,the Q value is also 6000,and FSR is about 40nm.?3?The filtering characteristics of the track micro-ring resonator and the loading of the electric field are studied.The effect of the electric field on the transmission characteristics of the device is analyzed.The results show that the output spectrum of the resonator has a blue shift after loading the electric field,which will lay the foundation for the realization of the control of the output spectrum of the device in the future.At the same time,we also studied the micro-disk structure with micro-ring resonator belonging to the whispering gallery mode cavity,which plays an important role in the optimization and performance improvement of the future micro-ring resonator. |
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