用于光纤测量的1310nm／1550nm半导体激光驱动电源

摘要

A high stability and continuously adjustable 1310nm/1550nm semiconductor laser power supply was designed for accurate and rapid measurement of the optical fiber .The laser power supply uses precision constant current source to drive the semiconductor laser diodes by applying the current negative feedback control technology and constant temperature control circuit to drive thermoelectric coolers , and ensures the stability of the laser output power .The contrdler area network bus circuit realizes continuous power adjustment and laser source selection , and variable integration proportion-integration-differentiation algorithm eliminates the integral saturation and accelerates the system temperature stability.The laser power supply works reliably and stably under laser protection and soft -start circuit.The experimental results show that the system has stability of temperature of ±0.01℃and the long-term output power stability of ±0.018dB when the laser works at room temperature 25℃.Compared with the traditional 1310nm/1550nm laser power supply, the system has high and fast stability , small size and facilitates the optical fiber online measurement .%　　为了实现光纤的精确快速测量，设计了一种高稳定功率连续可调的1310nm/1550nm半导体激光驱动电源。该电源采用电流串联负反馈技术组成精密恒流源驱动半导体激光二极管，恒温控制电路驱动半导体制冷器，从而保证了激光器输出功率的稳定。控制器局域网络总线电路实现激光源的功率连续可调及激光的选择，通过变速积分PID控制算法消除了积分饱和，加速系统温度的稳定。采用激光保护和软启动电路，实现半导体激光器可靠稳定运行。结果表明，半导体激光器工作在室温25℃时，温度稳定性达±0.01℃，激光长期输出功率稳定度达±0.018dB。相对于传统的1310nm/1550nm半导体激光光源，该光源稳定性高、稳定速度快、体积小，方便光纤在线测量。