【摘要】 设计了一种高双折射光子晶体光纤(Photonic Crystal Fiber,PCF),即增大两个与纤芯相邻的空气孔直径,使光纤只具有二重对称性,呈现出较高的双折射.通过压缩x轴方向孔间距,进一步增大双折射度.采用全矢量有限单元法(Finite-element Method,FEM),研究了该光子晶体光纤基模对应的相双折射和群双折射,给出了该高双折射PCF双折射随输入光波长的变化曲线.结果获得了10-3量级的高双折射.具有设计参量的该光子晶体光纤结构的相双折射在1550nm处可以达到5.0×10-3,在更长的波长处,这一值会更高.更多还原

【Abstract】 A kind of high birefringence photonic crystal fiber(PCF)was proposed.Enlarging two of the central air holes,the fiber has twofold symmetry and appears the high birefringence.By squeezing the air hole lattice,the modal birefringence of such a PCF can be further enhanced.The phase and group birefringence of the fundamental mode in such a PCF are studied by using a full-vector finite-element method,and the curves showing the relation between the birefringence of this PCF and the wavelength of the input light are given.The high modal birefringence with magnitude of order of 10-3 has been obtained.The phase modal birefringence of such a PCF with the parameters calculated can reach 5.0×10-3 at 1 550 nm and even higher at longer wavelength.更多还原