基于dsp的半导体激光器解耦控制分析word格式论文.docxVIP

ABSTRACTLaser diode (LD) has been widely used because of its superiority low driving voltage, direct modulation and moving easy. LD has high power density and quantum efficiency. It is very sensitive to driving current and temperature, so even a tiny fluctuation will lead to remarkable change its output light or parameter, and cause serious damage to laser device further more. Therefore, in practical applications, driving current and temperature of LD should be well controlled.To further enhance the output performance of LD and easily operate, this paper made improvments in the LD driving systems hardware and control algorithm based on initial work. These mainly improvements perform as follow:The system selected SEED-DEC2812 as the control core, in the LD temperature control circuit, a PWM push-pull driver circuit was designed according to the thermoelectric cooler (TEC) driving characteristic, it can solve the problems of PWM drive circuit’s flow-through and linear drive’s low efficiency. While a linear program was designed to increased the temperature accuracy of driver circuit. A isolating circuit was designed to reduce the effect between LD driver and temperature control modules, which can significantly enhance the stability of LD system. Analysised the LD components’ heat transfer characteristic through the research of TEC, then designed related circuit to improve the temperature control efficiency of LD system. Research the LD system’s characteristics relationship between energy balance, material balance, momentum balance, chemical reaction rule, electronic principles and so on, then established LD’s coupling mathematical model in mechanism. Input different signals, and studying the LD’s relationship between output response and input stimulus signal, then estimated LD’s coupling mathematical model in experiment. Research decoupling control method such as diagonal matrix decoupling, unit matrix decoupling and feed-forward decoupling, then established LD decoup