Abstract

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 HE_1m and EH_1m modes in a biaxial fiber depend on the transverse polarization orientations but that the TE and TM modes and the HE_vm and EH_vm modes with υ ≠ 1 do not.

© 1992 Optical Society of America

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