Research And Implementation Of Thermo-optic Effect Simulation Of Integrated Optical Waveguide

In recent years, with the vigorous development of optic-electronics industry, a variety of optical waveguide devices with diverse functions and structures were designed. However, the refractive index of optical waveguide devices division and geometry in which the light transmit are complex, which makes a great of difficulties for optical design. The traditional design of optical waveguide devices which relies on experimental methods becomes time-consuming and labor-intensive. So it is important to develop high-performance, high-precision optical components by using CAD tools to analyze, simulate and design the optical waveguide devices. The development of CAD technology has important theoretical and practical significance to optoelectronics, optical device design and simulation.In the next-generation optical information network system, optical switches and optical modulators and other photonic devices play an important role. Optical switches now have a wide range of applications in the realization of optical signal routing, wavelength selection, optical cross-connect and self-healing protection. High-speed optical modulator is the key component of long-distance optical communication devices. Its role is very important in the whole optical communication system. Now, it has been widely used in the light emission, transmission, reception to control light intensity.Thermal-optic switches and modulators have been researched variously by lots of institutions at home and abroad due to a simple fabrication process, switching modulation good performance and low power consumption. The main work of this paper is to simulate thermo-optic effect with computer, which is the working mechanism of thermo-optic devices. It presents research and implementation of a numerical algorithm with high precision, fast calculation speed optical components that calculates the temperature distribution of the thermo-optic devices, and as a complete functional module it is integrated into the optical chip CAD simulation software system.Firstly, the thermo-optic effect of the thermo-optic devices and the heat transfer theory which is the basis of temperature field simulation are discussed. Also a brief analysis of the commonly knowledge using finite difference method to solve numerical problems is mentioned, which concludes the solution method that can quickly achieve approximate result with high accuracy.Secondly, the common optical device structures including silicon-based polymer thermo-optic devices and SOI thermal thermo-optic devices have been discussed. Based on these common structures, the thermal analysis model has been established. Some thermal properties of the thermo-optic devices are taken to some reasonable approximation to complete numerical simulation of the distribution of temperature field. The numerical simulation of thermo-optic effect is achieved through temperature distribution simulation. Then the algorithm has been programmed using FORTRAN language.Then a new drawing element to support the human-computer interaction experience of the thermo-optic effect simulation module has been designed with the utilization of a common graphics editing module. The mixed language programming technology is used for thermo-optic effect simulation algorithm module to integrate this module into the optical chip CAD simulation software system.Finally, an example of the thermo-optic effect simulation algorithm in optical chip CAD simulation system is introduced. The post-processing effect of simulation output results has been analyzed.The thermo-optic effect of the thermo-optic devices directly determines the performance of the thermo-optic devices. The research of this paper has laid a foundation for the optimization of the thermo-optic device's structure and production of thermo-optic devices with good performance. It has important practical value.