光纤耦合激光器驱动与控制技术研究

针对一种将多个半导体激光器(LD)芯片串联驱动,通过光纤耦合进行功率合成,构成光纤耦合高功率输出激光模块的特殊驱动要求,研发了小型化高效率激光电流源组件和小型化高效率半导体制冷(TEC)LD模块温度控制组件。组件工作温度范围为-45℃～55℃,实验证明达到了设计性能指标要求。建立了LD模块驱动电流源电路的数学模型,提出了LD模块电流源控制电路的数字化实现方法,并利用ADuC831单片机实现了数字化设计。给出了一种基于TEC的LD模块温度控制组件的结构,建立了简化、实用的温度控制系统数学模型,对TEC的性能系数ξ、控制端的热量Qc和TEC的工作电流I进行了寻优控制,减小了激光器输出波长随温度的漂移。

Research on Electronic Control Technology of Fiber Coupled Laser-Diode

For the special power requirements of the laser module, which is consist of the multiple laser diode (LD) chips series driven and the power of synthetic by combining the fiber, a small high-efficiency laser current source component is designed and developed, and a small high-efficiency semiconductor cooling thermal electrical cooler (TEC) fiber-coupled laser module temperature controlling component is presented as well. The component operating temperature range is from -45 ℃ to 55 ℃, and the result that the design can meet the performance requirements has been proved in the experiment. The mathematical model of LD module driving current source circuit is established. The digital design method of a laser current source controlling circuit is presented, and achieved using ADuC831. The temperature controlling component structure of a LD module based on the TEC is introduced, a simplified mathematical model of the temperature control component is established, and the coefficient of performance of the TEC ξ, the controlling side of the heat Qc and the operating current I of TEC are optimized to solve the problem of laser output wavelength drifting with temperature.