面向混沌半导体激光器的高稳定控制系统设计

Design of High Stability Control System for Chaotic Semiconductor Lasers

针对混沌半导体激光器输出波长和功率的稳定性问题,设计了一套面向混沌半导体激光器的高稳定控制系统。利用深度负反馈电路实现对激光器驱动电流的高稳定高精度恒流控制;采用模糊自适应比例-积分-微分算法以及H桥驱动电路设计的温度控制器实现了对激光器温度的稳定控制。结果表明,所设计的双通道电流源输出电流范围分别为0.00~40.00 mA和0.00~100.00 mA,在室温25.0℃环境下稳定度分别优于0.002%和0.004%,调节精度均可达0.01 mA;驱动电流为20.00 mA时,混沌半导体激光器连续工作120 min的输出光功率漂移量分别仅为0.0066 dBm和0.0072 dBm;温度控制电路的温度控制范围为18.0~40.0℃,激光器在25.0℃下工作120 min的中心波长漂移量仅为0.007 nm。该控制系统在环境温度为10.0~40.0℃范围内可稳定工作。

Aiming at the stability of output wavelength and power of chaotic semiconductor lasers,a high stability control system for chaotic semiconductor lasers is designed.The deep negative feedback circuit is used to realize high stability and high precision constant current control.The high stability control of laser temperature is realized by using fuzzy adaptive proportional-integral-differentiation algorithm and H bridge drive circuit.The results show that the output current range of the designed dual-channel current source is 0.00-40.00 mA and 0.00-100.00 mA,and the stability at room temperature of 25.0℃ is better than 0.002% and 0.004%,respectively.The adjustment accuracy can reach 0.01 mA.When the driving current is 20.00 mA,the output optical power drift of the chaotic semiconductor laser works continuously for 120 min is only 0.0066 d Bm and 0.0072 d Bm,respectively.The temperature control range of the temperature control circuit is 18.0-40.0℃,and the central wavelength shift of the laser working at 25.0℃ for 120 min is only 0.007 nm.The control system can work stably at the ambient temperature of 10.0-40.0℃.