Propagation Properties in a Doubly Clad Optical Fiber with Left-handed Material Core
左手材料纤芯双包层光纤的传输特性

A doubly clad fiber with right-handed material inner and outer cladding,but left-handed material core is analyzed in weakly guiding approximation.Suppose a lossless fiber,the characteristic equations for four kinds HE,EH,TE and TM guided modes are derived and further simplified under far from cutoff condition.Dispersion curves for the lowest order mode of the every four kind modes are calculated for different inner cladding refractive index and thickness.Compared with corresponding curves for a common right-handed doubly clad fiber.It indicates that these curves show abnormal dispersions.