分布反馈光纤激光保偏输出的偏振耦合实现方法

Polarization Coupling Implementation Method of Distributed Feedback Fiber Laser Polarization Maintaining Output

将DFB-FL(distributed feedback fiber laser)刻写在单模掺铒光纤上,为了实现激光器的运转具备单偏振的特性,可通过操作偏振曝光量来实现。DFB-FL输出尾纤可以用保偏熔接机将其更换为保偏光纤,在转动DFB-FL调整激光偏振方向与保偏光纤慢轴夹角的同时,通过功率计和消光比测试仪监测激光功率和偏振消光比变化,当激光功率最大且偏振消光比最大时,则DFB-FL激光和保偏光纤实现偏振耦合。实验得到了偏振消光比大于30dB、偏振态为线偏振光的DFB-FL,激光效率、线宽、噪声等均未发生明显变化。

DFB-FL is written on single mode Erbium-doped fiber.Its characteristics of single polarization operation can be realized by polarization exposure.The DFB-FL output tail fiber can be replaced with the polarization-maintaining fiber by using the polarization-maintaining welding machine.While adjusting the angle between the laser polarization direction and the slow axis of the polarization maintaining fiber,the changes of laser power and polarization extinction ratio were monitored by power meter and extinction ratio tester.When the laser power is maximum and the polarization extinction ratio is maximum also,the polarization coupling between DFB-FL and polarization-maintaining fiber can be achieved.The experiment obtained DFB-FL with polarization extinction ratio greater than 30dB and polarization state as linear polarized light,without laser efficiency,line width,noise,etc significant changes exactly.