采用数模混合双闭环方法的DFB激光器驱动电源

曲世敏; 王明; 李楠

doi:doi:10.3788/irla201645.1105007

红外与激光工程, 2016, 45 (11): 1105007, 网络出版: 2017-01-20

采用数模混合双闭环方法的DFB激光器驱动电源

DFB laser driving power using hybrid digital-analog closed loop

论文大纲

曲世敏 ^*王明李楠

作者单位

吉林大学电子科学与工程学院, 吉林长春 130012

分布式反馈式激光器数模混合双闭环技术 Ziegler-Nichols PID算法驱动电源 distributed feedback laser hybrid digital-analog closed loop method Ziegler-Nichols PID algorithm driving power

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

As the driving current fluctuation can affect distributed feedback(DFB) laser′s emitting wavelength and optical power, a high stable DFB lasers driver was designed and developed by using hybrid digital-analog closed loop method, which was based on TMS320LF28335 core controller. In terms of hardware design, the proposed laser driver utilized operational amplifier deep feedback theory to increase the stability of the whole system(better than 4×10-5). In software design, Ziegler-Nichols PID algorithm was introduced to eliminate the micro deviation between the real driving current and the theory current value(less than 0.5%). Meanwhile, the driver possessed surge protection circuit when power was on/off, time delay soft start circuit and over current protection circuit, et al. Using the aforementioned driver, a driving test was performed on a DFB laser with a center wavelength of 1 742 nm. Experiments show that the stability of driving current is better than 4×10-5(RMS) during long term(>220 h) stability performance test, which meets the requirement of DFB laser and has good practical significance.

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曲世敏, 王明, 李楠. 采用数模混合双闭环方法的DFB激光器驱动电源[J]. 红外与激光工程, 2016, 45(11): 1105007. Qu Shimin, Wang Ming, Li Nan. DFB laser driving power using hybrid digital-analog closed loop[J]. Infrared and Laser Engineering, 2016, 45(11): 1105007.

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