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.
© 2003 Optical Society of America
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2300) Fiber optics and optical communications : Fiber measurements
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
Yongwoo Park, Sangsoo Choi, Un-Chul Paek, Kyunghwan Oh, and Dug Young Kim, "Measurement Method for Profiling the Residual Stress of an Optical Fiber: Detailed Analysis of Off-focusing and Beam-Deflection Effects," Appl. Opt. 42, 1182-1190 (2003)