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传统的大模场光纤是通过设计光纤结构来获得大模场面积的,可以实现的模场面积只能达到几百平方微米。增益导引和折射率导引相结合是实现大模场单模光纤的一种新方法。通过分析增益因子对折射率以及归一化频率的影响,得到了光纤中各阶模式截止条件与纤芯包层折射率差和增益因子的关系。最后以包层折射率为1.5734,纤芯折射率为1.5689,纤芯半径为50μm,10%(原子数分数)重掺杂钕离子的磷酸盐光纤作为模拟计算对象,当波长为1.064μm时,得到其模场直径大于90μm。对于普通光纤,增益导引和负折射率导引相结合的方法对实现大模场单模传输很有前景。
The traditional large-mode field optical fiber is obtained by designing the optical fiber structure to obtain the large mode field area, and the achievable mode field area can only reach a few hundred square micrometers. The combination of gain steering and refractive index guidance is a new way to achieve large-mode single-mode fiber. By analyzing the influence of the gain factor on the refractive index and the normalized frequency, the relationship between the cutoff condition of each mode in the fiber and the refractive index difference and the gain factor of the core cladding is obtained. Finally, the refractive index of the cladding was 1.5734, the core refractive index of 1.5689, the core radius of 50μm, 10% (atomic number) phosphate ions doped neodymium phosphate fiber as a simulation object when the wavelength of 1.064μm, Get its mode field diameter greater than 90μm. For common fiber, the combination of gain steering and negative index steering is promising for large-mode single-mode transmission.