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研究了一种新型光纤环镜(FLM)的原理与特性,这种FLM由在普通光纤环镜中插入光纤型偏振控制器(PC)构成.通过等效光路分析建立了该FLM的理论模型,并对其反射特性进行了数值模拟.研究表明,通过改变PC的状态,即改变其双折射效应的快轴取向或强度,可连续调节FLM的反射率,反射率谱具有宽带特性,主要受光纤耦合器工作带宽的影响.此外,对FLM的反射特性还进行了实验研究.实验结果也证实,通过调节PC状态,FLM反射率可在其最大和最小值之间连续调节,实验测得FLM最大和最小反射率分别可达93%和2%.根据PC双折射效应的快轴取向和强度与其三个圆盘倾斜角度之间的对应关系,比较实验与模拟结果后发现,两者符合很好.
The principle and characteristics of a new type of fiber ring mirror (FLM) are studied. The FLM consists of an optical fiber polarization controller (PC) inserted in a common fiber ring mirror. The theoretical model of the FLM is established by equivalent optical path analysis. And the numerical simulation of its reflection characteristics was carried out.The results show that the reflectivity of the FLM can be continuously adjusted by changing the state of the PC, ie changing the orientation or intensity of the fast axis of the birefringence effect. The reflectivity spectrum has broadband characteristics, And the working bandwidth of the coupler.Furthermore, the experimental study on the reflection characteristics of FLM has also been carried out.The experimental results also confirm that by adjusting the PC state, the FLM reflectivity can be continuously adjusted between its maximum and minimum values, and the experimentally measured maximum FLM And the minimum reflectance of 93% and 2%, respectively.According to the correspondence between the fast axis orientation and intensity of the PC birefringence effect and the tilt angle of the three disks, the experimental and simulation results are compared and found to be in good agreement .