基于FPGA的半导体激光器驱动电源的研制

Development of a laser diode driver based on FPGA

半导体激光器(LD)驱动电源的性能是影响其工作特性的重要因素,提高LD驱动电源性能的研究具有重要意义。提出了一种新型的基于现场可编程门阵列(FPGA)技术的半导体激光器驱动电源设计方案,该方案以FPGA为控制核心,LD驱动电源的AD/DA转换、温度PID控制、恒定电流驱动、LD保护及人机交互等功能模块电路均在FPGA的控制下协调工作。设计并实现了基于FPGA的LD温度控制与电流驱动电路,测试结果表明当LD的工作温度在20℃～30℃时,其工作温度稳定度优于士0.03℃,驱动电流的恒定度达到士0.1%。

The performance of a laser diode （LD） driver is a quite important factor affecting its operating properties, thus it is significant to improve the performance of the LD driver. A novel scheme of designing the LD driver based on field programmable gate array （FPGA） is proposed. Employing FPGA as the controlling center, all the functional modules of the LD driver, including AD/DA converting, temperature PID controlling, invariably current driving, LD protection, input and output circuit, are arranged to operate together harmoniously under FPGA. The LD temperature controlling and current driving circuit based on FPGA is designed and demonstrated, and the performance test is carried out when its operating temperature is among 20℃- 30℃. The experimental results show that the operating temperature stability is superior to ±0.03℃, and the driving current stability is ±0.1%.