基于FPGA技术的半导体激光器驱动电源的研制

提出了一种新的连续半导体激光器(LD)驱动电源设计方案,该方案融入FPGA技术,采用日立SH系列单片机HD64F7045为控制核心,实现了高稳定度的激光器驱动和温度控制。LD驱动单元中,应用负反馈技术分别实现注入电流IF、驱动电压VF和光功率的高稳定控制,还采取了软启动控制、短路开关和限幅保护的措施,有效地保证了LD的安全。LD温度控制单元中,采用了比例积分(PI)控制技术并结合积分分离的思想,实现对LD温度的高稳定度的控制。实验表明,注入电流的稳定度达到10-4量级,温度稳定度优于±0.01℃,性能比以往的同类系统提高了一个数量级。

Development of a laser diode driver based on FPGA

A new continue wave laser diode driver,which integrates FPGA technique, with high quality single-chip microcomputer (SCM) HD64F7045 as the controlling center is presented. In the LD controller module, the use of negative feedback technique could stabilize the drive current (IF), the optical output power (Po) and the forward voltage (VF) respectively with high stability.The complete laser diode protection is provided by means of independent current limit and power limit settings, output off shorting circuits, and a slow turn on sequence. In the temperature controller module, the temperature could be controlled precisely with PI control method and the thought of integral separation. Results show that forward current stability can attain 10-4 degree, and temperature stability can attain ±0.01 ℃.