INSTRUMENT FOR MEASURING RESIDUAL STRESS OF OPTICAL FIBER

PROBLEM TO BE SOLVED: To measure a residual stress of an optical fiber having a circular asymmetric stress distribution. SOLUTION: This instrument for measuring the residual stress of the optical fiber is constituted of a light source for generating light for measuring the residual stress of the optical fiber, a lens system for transforming the generated light into a plane wave, a polarization system for transforming the light transformed into the plane wave into a desired input polarization to be made incident into the optical fiber, a rotary type measuring part for rotating the optical fiber to transmit the polarized light to various directions of the optical fiber, and a detection system for detecting the residual stress having the circular asymmetric stress distribution of the optical fiber, based on a phase change of the light transmitted through the optical fiber. A residual stress distribution of the optical fiber having the circular asymmetric stress distribution, and a level thereof are measured accurately thereby since the residual stress is measured while rotating the optical fiber. COPYRIGHT: (C)2004,JPO