一体化脉冲式半导体激光器驱动电路及其布局

Integrative Driving Circuit and Its Layout of Pulsed Laser Diode

脉冲式半导体激光器驱动电路会对激光接收电路和信号处理电路产生很强的电磁干扰;同时,由激光器驱动电路布局和走线不当引起的寄生参数也会延长激光脉冲的前沿上升时间,损耗激光发射功率。为解决上述问题,把脉冲式半导体激光器驱动电路作为独立功能模块放置于光学窗体所在的前端舱体中,进行一体化设计,优化布局和走线;同时,激光器驱动电路单独供电并采用光耦与接收电路及信号处理电路进行隔离;激光器驱动电路采取屏蔽措施。经测试,激光器驱动电路对接收电路和信号处理电路辐射干扰所感应出的放电干扰脉冲信号幅度被控制在70mV以下,激光电源抖动引起的传导干扰被抑制,激光发射功率增强。

The driving circuit for pulsed laser diode will strongly interfere the receiving circuit and the signal processing circuit, and the parasitic parameters from improper board layout and its routing increase the rising time of pulse leading edge and decrease the laser sending power. To solve these problems, the following measurements were kaken. Firstly, the driving circuit, as a independent function module, was placed in the front cabin where optical windows were set, and the integrated design was done The board layout and lead layout of the driving circuit was optimized. Secondly, the driving circuit was supplied independently, and separated from the receiving circuit and the signal processing circuit by optocou- pier. Finally, the driving circuit should be shielded. Testing results showed that the amplitude of jamming discharge pulse was reduced within the range of 70 mV. Conductive interference brought out by laser supply jitter was suppressed. The laser transmitting power was increased.