采用数模混合双闭环方法的DFB激光器驱动电源

发布时间：2018-06-11 19:27

本文选题：分布式反馈式激光器 + 数模混合双闭环技术　；参考：《红外与激光工程》2016年11期

【摘要】：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。
[Abstract]:Because the fluctuation of driving current will affect the excitation wavelength and luminous power of distributed feedback DFB laser, a kind of high stability DFB laser driver is designed and developed by using digital-analog hybrid double closed loop technology and TMS320LF28335 as the core controller. In the aspect of hardware circuit design, the power supply of this laser adopts the principle of depth negative feedback of operational amplifier, which improves the stability of the system (better than 4 脳 10 ~ (-5). In the software design, Ziegler-Nichols pid algorithm is introduced to eliminate the small difference between the actual driving current value and the theoretical value (less than 0.5%). At the same time, the drive power supply has protection circuit, such as protection circuit, delay soft start circuit and over-current protection circuit. The driving test of 1742 nm DFB laser with the center wavelength of 1742 nm has been carried out by using the drive power supply. The experimental results show that the stability of driving current is better than 4 脳 10 ~ (-5) RMS / L, which meets the requirements of DFB laser and has a strong practical value.
【作者单位】：吉林大学电子科学与工程学院;
【基金】：国家高技术研究发展计划(863计划)(2013BAK06B00)
【分类号】：TN248

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