基于ADN8810和ADN8835的混沌激光器驱动及温控电路设计

Design of chaotic laser driver and temperature control circuit based on ADN8810 and ADN8835

为获得对混沌激光器的高稳定性驱动电流,实现对混沌激光器驱动电流与温度的高精度调节,基于ADN8810和ADN8835芯片设计一种混沌激光器驱动及温控电路.电路可输出驱动电流0~80 mA,满足最小调节精度0.01 mA线性可调的驱动能力;可在0.5~4.5 V调节半导体制冷器(thermoelectric cooler,TEC)端最大电压值以适应具有不同TEC的激光器;在0.5~4.3 A调节TEC最大电流值以保护激光器.实验结果证明,本电路输出的驱动电流稳定度优于0.007%,2 h内激光器的温度最大波动为0.17℃.能够满足混沌激光器的需求.

In order to obtain high stability driving current for chaotic laser and achieve high precision adjustment of chaotic laser driving current and temperature,based on the ADN8810 and ADN8835 chips,we design a chaotic laser drive and temperature control circuit for the chaotic laser.The driving current can be output from 0 to 80 mA,which satisfies the minimum regulation accuracy of 0.01 mA and a linearly adjustable drive capability.The maximum voltage value of the thermoelectric cooler(TEC)terminal can be adjusted internally in the range from 0.5 to 4.5 V to adapt to lasers with different TECs.The maximum current value of the TEC can be adjusted in the range from 0.5 to 4.3 A to protect the laser.The experimental results prove that the stability of the driving current for the circuit output is better than 0.007%,and the maximum fluctuation of the laser temperature is 0.17℃ within 2 hours,which can meet the needs of chaotic lasers.