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由于分布反馈式(DFB)激光器输出光功率受其激射电流的影响,为了保证其稳定的光功率输出,研制了基于位移式数字PID算法的高稳定性DFB激光器驱动电源。在硬件设计方面,该驱动电源主要由控制器模块、恒流源模块和保护电路模块组成。采用模拟PI深度负反馈环节有效地提高了驱动电流的稳定性。在软件方面,采用位置式数字PID算法,消除了实际驱动电流值与理论值之间的微小差异。利用该驱动电源,对中心波长为1 563.01 nm的DFB激光器做了驱动测试。实验表明,长期稳定性(>220 h)优于4×10-5,中心波长未出现漂移,为其在红外气体检测中提供了优越性能保障。
Due to the influence of laser current on the output optical power of distributed feedback (DFB) laser, a high stability DFB laser driving power supply based on displacement digital PID algorithm is developed to ensure its stable optical power output. In terms of hardware design, the drive power mainly by the controller module, constant current source module and protection circuit module. Adopting the analog PI depth negative feedback effectively improves the stability of driving current. On the software side, the position-based digital PID algorithm eliminates the small differences between the actual drive current and the theoretical value. The drive power was used to drive the DFB laser with a center wavelength of 1 563.01 nm. Experiments show that the long-term stability (> 220 h) is better than 4 × 10-5, the central wavelength does not drift, which provides superior performance in infrared gas detection.