BASE MATERIAL FOR POLARIZATION MAINTAINING OPTICAL FIBER

摘要

PURPOSE:To easily decide a bending direction where crosstalk deterioration becomes minimum from outside by setting the softening temperature of a clad lower than that of a core and making the centers of the clad and core eccentric with each other. CONSTITUTION:Strain including parts 6 are provided symmetrically about the axis connecting the centers P and O of the clad 5 and core 4 and the centers O and P are made not coincident, but eccentric. The materials of the clad and core are so selected that the softening temperature of the clad 5 is lower than that of the core 4 and the strain inducing parts 6 differ in coefficient of heat expansion from the clad 5. Then the core 4' generates bending moment after wire drawing and the fiber curved itself with the core 4' in.