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针对超辐射发光二极管(Super Luminescent Diode,SLD)光源输出光功率稳定性的需求,从光源的温控电路出发,建立了SLD恒流回路与半导体致冷器(TEC)之间的电场耦合模型,探讨了SLD光源的重要组件——TEC对其内部电场的影响;分析了光源内部不同组件间的分布电容。研究结果表明:温控电路产生的交流分量作用于光源内部半导体致冷器,产生时变电场,经分布电容耦合到恒流回路中,影响输出光功率的稳定性;SLD光源外壳接地良好,可减小分布电容,从而减小电场耦合对输出光功率的影响。
Aiming at the demand of optical power stability of super luminescent diode (SLD) light source, the electric field coupling model between SLD constant current circuit and semiconductor cooler (TEC) is established based on temperature control circuit of light source. The influence of TEC on its internal electric field, which is an important component of SLD light source, is discussed. The distributed capacitance between different components in the light source is analyzed. The results show that the AC component generated by the temperature control circuit acts on the semiconductor cooler inside the light source to generate the time-varying electric field which is coupled to the constant current loop through the distributed capacitor, which affects the stability of the output optical power. The SLD light source case is grounded well, Can reduce the distributed capacitance, thereby reducing the impact of the electric field coupling on the output optical power.