论文部分内容阅读
设计了一种同轴双芯六角点阵光子晶体光纤,该光纤中心缺失一根空气柱形成内纤芯,通过减小第4环空气孔的直径形成外纤芯.采用全矢量有限元法并结合各向异性完美匹配层边界条件,对其色散、非线性、约束损耗和模场等特性进行了数值模拟.结果发现,该光纤呈现高负色散可调效应和较强的模场约束能力,约束损耗接近10~(-2)dB·m~(-1).调整光纤结构参数(即空气孔间隔A,小孔直径d_1和相对孔间隔比f),可以控制其高负色散工作波长.若调整光纤结构参数A=1.2μmf=0.917,d_1=0.515μm时,该光纤在低损耗通信窗口C波段呈现负色散和负色散斜率,其色散斜率在-1--6 ps·km~(-1)nm~(-2)范围内波动,在波长1.55μm处负色散值为-3400 ps·km~(-1)nm~(-1),模场面积高达43μm~2,非线性系数仅有3.6 km~(-1)W~(-1).该光纤在C波段呈现的低损耗低非线性高负色散特性,具有很好的色散补偿能力,将在长距离大容量高功率高速光通信系统中获得很好的应用.
A coaxial dual-core hexagonal lattice photonic crystal fiber is designed, an air column is formed in the center of the optical fiber to form the inner core, and the outer core is formed by reducing the diameter of the fourth ring air hole. The full-vector finite element method The properties of dispersion, nonlinearity, restraint loss and mode field were numerically simulated by combining the boundary condition of perfectly matched anisotropic layer. The results show that the fiber exhibits high negative dispersion effect and strong mode field restraint ability, The confinement loss is close to 10 -2 dB · m -1 The optical fiber structure parameters (ie air hole spacing A, hole diameter d_1 and relative hole spacing ratio f) can be adjusted to control the high negative dispersion working wavelength. If the fiber structure parameters A = 1.2μmf = 0.917 and d_1 = 0.515μm, the optical fiber exhibits a negative dispersion and a negative dispersion slope in the C band of the low loss communication window with a dispersion slope of -1 - 6 ps · km ~ (- 1) nm ~ (-2), the negative dispersion value is -3400 ps · km ~ (-1) nm ~ (-1) at the wavelength of 1.55 μm and the area of the mode field is up to 43 μm ~ 2. The nonlinear coefficient And has 3.6 km ~ (-1) W ~ (-1) .The optical fiber exhibits low loss and low nonlinearity with high negative dispersion in the C band, has good dispersion compensation capability, High-power high-speed optical communication system to obtain a good application.