The confinement losses in air-guiding photonic bandgap fibers （PBGFs） with air hole missing are studied with the full-vector finite-element method. It is confirmed that there are two loss peaks （1.555 and 1.598 μm...The confinement losses in air-guiding photonic bandgap fibers （PBGFs） with air hole missing are studied with the full-vector finite-element method. It is confirmed that there are two loss peaks （1.555 and 1.598 μm） if there is a hole missing in the cladding far from the core. The closer to the core the hole missing is, the larger the confinement losses are, and even no mode could propagate in the core. The main power of the fundamental mode leaks from the core to the cladding defect. The quality of PBGFs can be improved through controlling the number and position of defects.展开更多
研究了一种光子带隙光纤准直器。为了降低回波对光源的干扰,通常光纤准直器的回波损耗不应低于60 d B。由于带隙光纤端面没有反射,因此满足这一条件的带隙光纤准直器GRIN透镜入射面的倾斜角与普通光纤准直器不同。从高斯光束通过光学系...研究了一种光子带隙光纤准直器。为了降低回波对光源的干扰,通常光纤准直器的回波损耗不应低于60 d B。由于带隙光纤端面没有反射,因此满足这一条件的带隙光纤准直器GRIN透镜入射面的倾斜角与普通光纤准直器不同。从高斯光束通过光学系统的一般模型出发,利用矩阵光学和高斯光束耦合理论,推导了光线传输矩阵。结合实际应用中光纤及GRIN透镜的参数,仿真分析了尾纤与GRIN透镜之间的间距及GRIN透镜的参数对准直器回波损耗的影响。结果表明,镀有增透膜时,当光子带隙光纤准直器的GRIN透镜入射面倾角等于3°时,回波损耗大于60 d B。研究结果对进行光子带隙光纤准直器的设计具有指导意义。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 61077084)
文摘The confinement losses in air-guiding photonic bandgap fibers （PBGFs） with air hole missing are studied with the full-vector finite-element method. It is confirmed that there are two loss peaks （1.555 and 1.598 μm） if there is a hole missing in the cladding far from the core. The closer to the core the hole missing is, the larger the confinement losses are, and even no mode could propagate in the core. The main power of the fundamental mode leaks from the core to the cladding defect. The quality of PBGFs can be improved through controlling the number and position of defects.
文摘研究了一种光子带隙光纤准直器。为了降低回波对光源的干扰,通常光纤准直器的回波损耗不应低于60 d B。由于带隙光纤端面没有反射,因此满足这一条件的带隙光纤准直器GRIN透镜入射面的倾斜角与普通光纤准直器不同。从高斯光束通过光学系统的一般模型出发,利用矩阵光学和高斯光束耦合理论,推导了光线传输矩阵。结合实际应用中光纤及GRIN透镜的参数,仿真分析了尾纤与GRIN透镜之间的间距及GRIN透镜的参数对准直器回波损耗的影响。结果表明,镀有增透膜时,当光子带隙光纤准直器的GRIN透镜入射面倾角等于3°时,回波损耗大于60 d B。研究结果对进行光子带隙光纤准直器的设计具有指导意义。
