电光调制器自适应偏振控制系统设计和实现.pdfVIP

第44卷第6期 红外与激光工程 2015年6 月 Vol.44No.6 InfraredandLaserEngineering Jun. 2015 电光调制器自适应偏振控制系统设计与实现 李永倩，孟祥腾，安 琪，吕安强，王 跃，王 宇 (华北电力大学 电子与通信工程系，河北 保定 071003) 摘 要院 为了保持电光调制器 (EOM) 输入光偏振方向始终与其内部可传播模式偏振方向一致，使 EOM 获得良好的调制效果，提出了一种基于比例-积分-微分(PID)算法的EOM 自适应偏振控制方 法，理论分析并实验验证了该方法的可行性。实验结果表明，基于该方法设计的控制系统不仅能实时 监测EOM输出光功率，而且能保持其输出光功率最大；与激光器和EOM输入端直接用保偏光纤连 接时相比，PID偏振控制下EOM 输出平均功率提高了3.08dB，PD 输出电压标准差由0.1214 降至 -4 1.2375伊10 ，稳定控制状态下偏振态矫正时间在ms量级。 关键词院 电光调制器(EOM)； 偏振态； PID； 自适应控制 中图分类号院TN929.11 文献标志码院A 文章编号院1007-2276(2015)06-1854-05 Design and implementation of electro鄄optic modulator adaptive polarization control system Li Yongqian, Meng Xiangteng, An Qi, Lv Anqiang, Wang Yue, Wang Yu (Department of Electronics and Communication Engineering, North China Electric Power University, Baoding 071003, China) Abstract: In order to keep the input light polarization direction of electro鄄optic modulator(EOM) up with that of internal propagation mode in an EOM, and to obtain expected modulation effect, an adaptive control method based on proportional鄄integral鄄derivative (PID) algorithm was proposed. Theoretical analysis and experimental demonstration was conducted to verify the feasibility of the proposed method. The experimental results show that the control system designed by the method not only can real鄄time monitor the output optical power of EOM, but also can keep the output power maximum. Compared with the performance of EOM conncted directly to a narrow band laser with a polarization maintaining fiber, the output average power of EOM under the polarization control based on PID is increased by 3.08dB