Measurement method for profiling the residual stress of an optical fiber: detailed analysis of off-focusing and beam-deflection effects.
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.
Park
Yongwoo
Y
Basic Research Laboratory, Electronics and Telecommunications Research Institute, 161 Gajeong-dong, Yuseong-gu, Daejeon 305-350, Republic of Korea. ywpark@etri.re.kr
Choi
Sangsoo
S
Paek
Un-Chul
UC
Oh
Kyunghwan
K
Kim
Dug Young
DY