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利用有限差分光束传输法分析了全光纤纤芯变形光子晶体光纤中的模场分布以及能量损耗情况.实现了光子晶体光纤的选择性空气孔塌缩,制作了由小纤芯到大纤芯和圆形芯到矩形芯的纤芯变形光子晶体光纤,该光纤在波长1550nm下以小于0.05dB的能量损耗实现了光斑的整形.实验结果与模拟结果有很好的一致性.
The mode field distribution and energy loss in all-fiber C / D photonic crystal fiber are analyzed by the finite-difference beam transmission method. The selective air hole collapse of the photonic crystal fiber is achieved, The circular core to the rectangular core of the core deformation photonic crystal fiber, the optical fiber at 1550nm wavelength with less than 0.05dB energy loss to achieve spot shaping. The experimental results and the simulation results are in good agreement.