title: Measurement method for profiling the residual stress of an optical fiber: detailed analysis of off-focusing and beam-deflection effects.
abstract: The effects of off-focusing and beam deflection on polarimetric stress measurements of optical fibers are investigated. A simple method for reducing the distortion of the phase retardation caused by unwanted beam deflections in residual stress measurement is introduced. The method is examined numerically by ray-tracing techniques and experimentally by use of hollow silica fibers into which various index-matching liquids have been inserted. An autofocusing technique is introduced. The error in stress measurement reproducibility was determined to be less than 4%. We tested the absolute error in measured stress by applying incremental external tension and determined that it is less than 0.464 MPa.
authors.affiliation: Basic Research Laboratory, Electronics and Telecommunications Research Institute, 161 Gajeong-dong, Yuseong-gu, Daejeon 305-350, Republic of Korea. ywpark@etri.re.kr
authors.forename: Yongwoo
authors.initials: Y
authors.lastname: Park
authors.forename: Sangsoo
authors.initials: S
authors.lastname: Choi
authors.forename: Un-Chul
authors.initials: UC
authors.lastname: Paek
authors.forename: Kyunghwan
authors.initials: K
authors.lastname: Oh
authors.forename: Dug Young
authors.initials: DY
authors.lastname: Kim