Residual stress measuring device for optical fiber

This application claims priority to an application entitled "RESIDUAL STRESS MEASURING DEVICE FOR OPTICAL FIBER," filed in the Korean Industrial Property Office on Mar. 18, 2002 and assigned Serial No. 2002-14509, the contents of which are hereby incorporated by reference. The present invention relates to an apparatus for measuring the residual stress in an optical fiber which includes: a fixating unit for fixating an optical fiber with residual stresses to be measured therein; and a measuring unit comprising a light generator for generating a light for measuring the residual stresses in the optical fiber and a detector for detecting phase changes of the light that has been generated by the light generator; wherein the measuring unit measures the residual stresses in the optical fiber based on the phase changes of the light passed through the optical fiber, while the measuring unit is rotating along with the circumference of the optical fiber.