| The advantages of LD, such as small size, light weight, reliable, low power, high efficiency, and so on, make LD become the core of optoelectronic technology. LD is widely used in laser ranging, laser radar, laser communications, automation, etc., thus it promotes the development of optoelectronic information technology. The output power of LD is influenced by operating temperature. When the temperature of the active region rises, the average and maximum of output power reduce. Therefore, controlling of LD’s temperature is very important.Thermoelectric Cooler (TEC) is a special semiconductor device, which uses electrical signals to directly control the heat transfer. It also has the advantages such as small size, fast cooling, long life, high reliability, and so on, which make TEC to control the temperature of LD perfectly.In the thesis, based on the study of TO-CAN packaged LD, we create a simplified model of thermal analysis. Firstly, the model is assembled in SolidWorks, a famous CAD software. Then, through the intermediate format,*.x_t, the assembled model can be imported into ANSYS, also a very famous software, which is used to do thermal analysis. Lastly, we use ANSYS to modify the model.We analyze steady state and transient state of the TO-CAN model. Steady state thermal analysis is used to analyze the temperature of the model when TEC do not work. It includes that at different initial temperatures the final temperature the model reached, and the contour solution, and the different temperatures between LD and thermistor. Transient state thermal analysis is used to analyze the temperature when TEC works. It includes that at different initial temperature, the time when LD (or thermistor) reaches the final temperature, and how to control TEC to keep LD in a certain temperature.During steady state thermal analysis, we propose a method which solves the problem by modifying time of every substeps. This method can effectively reduce the number of calculations, and then reduce the operating time, and can maintain a high accuracy.We also propose a similar method which is used to control TEC. This method can control TO-CAN model to reach the target temperature in a short time. Compared with the method that use minimum step, it has less calculations, and can also achieve the purpose of rapid controlling. |
