高稳定性半导体激光器驱动电路的设计

Design of High Stability Driving Circuit for Semiconductor Laser

摘要:

为了保证激光器输出功率的稳定, 采用ADN2830给LD提供稳定的驱动电流, 以及采用MAX1978控制热电制冷器(TEC), 通过比例积分微分(PID)补偿电路产生控制信号控制TEC驱动电流的大小和方向, 实现对LD的制冷或加热, 从而保证LD工作在恒定温度下。经实验测试, LD在-35~45℃范围内输出光功率变化率小于0.06%; 在-55~85℃范围内输出光功率变化率小于0.16%。

Abstract:

The temperature is a key factor affecting the out power stability and lifetime of semiconductor laser diodes(LD)．For obtaining steady output power, ADN2830 and MAX1978 are used to provide a stable driving current for LD and to control the TEC, respectively. The magnitude and direction of the TEC were controlled by the control signal generated by proportional integral derivative (PID) compensating circuit. And meanwhile, the MAX1978 achieves the two-way control of the temperature of LD, so the LD can operate at a constant temperature. The experiment results show that the change rate of LD output power is less than 0.06% in the range of -35~45℃ and less than 0.16% in the range of -55~85℃.