【摘要】 提出了一种纯二氧化硅纤芯、渐变折射率分布的两模光纤,实现了渐变折射率少模光纤低差分模式群时延和纯二氧化硅芯光纤低损耗优点的有效结合。采用全矢量有限元方法研究表明,所提出的少模光纤纤芯采用纯二氧化硅实现了低损耗,采用纤芯渐变折射率实现了低差分群延迟,包层处采用凹陷折射率实现了低弯曲损耗,采用模式大折射率差实现了低模式串扰,采用大有效面积实现了低非线性系数;该光纤具有非线性系数和差分模式群时延在1.5～1.65μm波长范围内平坦特性。更多还原

【Abstract】 A kind of two-mode fiber with pure silica core and graded index is proposed by employing full vector finite element method,which combines the advantages of low differential mode group delay(DMGD) of graded index few-mode fiber and low loss of pure silica core fiber.The proposed few-mode fiber obtains low loss,low DMGD,low bending loss and low mode crosstalk using the methods of pure silica core,graded index,the trench refractive index and large mode refractive index,respectively.Moreover,the nonlinear coefficient and DMGD of the proposed few mode fiber are flattened in the wavelength range of 1.5-1.65 μm.更多还原