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由于驱动电流波动会影响分布式反馈式(DFB)激光器激射波长及发光功率,采用数模混合双闭环技术,以TMS320LF28335为核心控制器,设计并研制了一种高稳定性DFB激光器驱动电源。在硬件电路设计方面,该激光器驱动电源采用运算放大器深度负反馈原理,提高了系统的稳定性(优于4×10-5)。软件设计中,引入Ziegler-Nichols PID算法,消除了实际驱动电流值与理论值之间的微小差异(小于0.5%)。同时,该驱动电源具备防上电/断电冲击保护电路、延时软启动电路和过流保护电路等保护电路。利用该驱动电源,对中心波长为1742 nm的DFB激光器做了驱动测试。实验表明,在长时间(>220 h)稳定性测试中,驱动电流稳定度优于4×10-5(RMS),满足DFB激光器对驱动电流的要求,具有很强的实用价值。
Because of the fluctuation of drive current, the lasing wavelength and luminescence power of distributed feedback (DFB) lasers will be affected. By using the dual closed-loop technology and the TMS320LF28335 as the core controller, a high stability DFB laser driver is designed and developed. In the aspect of hardware circuit design, the laser driving power adopts the operational amplifier deep negative feedback principle, which improves the system stability (better than 4 × 10-5). Software design, the introduction of Ziegler-Nichols PID algorithm, eliminating the actual drive current value and the theoretical value of the small differences (less than 0.5%). At the same time, the drive power supply with protection against power-up / power-down protection circuit, delay soft-start circuit and over-current protection circuit protection circuit. The driving power was used to drive the DFB laser with the central wavelength of 1742 nm. Experiments show that the stability of the driving current is better than 4 × 10-5 (RMS) in the stability test for a long time (> 220 h), which meets the requirements of the DFB laser for driving current and has strong practical value.