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通过全矢量有限差分法数值模拟,设计了一种大模面积平顶模场光子晶体光纤。光纤截面上空气孔为三角形格子分布,中心七个空气孔缺失并在其中心引入一低折射率区域。分析了内纤芯大小、空气孔间距和空气孔相对大小等参数变化对内纤芯折射率、基模模面积等特性的影响。给出了工艺上简单易行的平顶模场光子晶体光纤结构,其平顶模面积可达2000μm2。发现增加内纤芯尺寸和导光波长,降低空气孔相对尺寸,可以减少光纤中的高阶模含量。
Through the full vector finite difference method numerical simulation, a large-mode area flat top mode field photonic crystal fiber is designed. The air holes in the fiber cross section are triangular lattice distribution, seven air holes in the center are absent and a low refractive index area is introduced in the center. The influences of inner fiber core size, air hole spacing and air hole relative size on the properties of the refractive index and the mode size of the inner core were analyzed. The simple and feasible top-mode photonic crystal fiber structure is given. The flat-top mold area can reach 2000μm2. It is found that increasing the size of the inner core and the wavelength of the light guide and reducing the relative size of the air holes can reduce the high-order content of the optical fiber.