DISPERSION CHARACTERISTICS OF CLADDED BIAXIAL OPTICAL FIBERS

A Perturbation analysis of optical dispersion characteristics in a biaxial-core step-index optical fiber with biaxial cladding and with the crystalline Z axis parallel to the fiber axis is presented. For the first time to our knowledge, the recently reported exact results on dispersion relations and field distributions of uniaxial-core optical fibers with uniaxial cladding are used as the foundation of the perturbation. This approach significantly simplifies the numerical calculations. Numerical results of a few of the lowest-order modes are presented for a YAlO3 single-crystal cladded fiber. The results show that the dispersion characteristics of the HE1m and EH1m modes in a biaxial fiber depend on the transverse polarization orientations but that the TE and TM modes and the HE(upsilon-m) and EH(upsilon-m) modes with upsilon not-equal 1 do not.