Abstract
An interferometric method to study the induced variations of nonlinear parameters in bent optical fiber such as third-order susceptibility and second-order refractive index is presented. Due to the expected nonlinear response of the Young’s modulus of fiber material, the profiles of asymmetric variations of the two parameters with curvature are observed and calculated, revealing the high spatial and index resolution of the method. The investigation is done in single-mode optical fibers at the standard operating wavelengths of 1300 and and at radii of curvature from 5 to . At the minimum radius of curvature , the cladding on the tensile side, whereas on the compressed side it is for . On the tensile side , whereas on the compressed side it is . For , the cladding and on the tensile side are and , whereas in the compressed cladding side they are and , respectively. At and , the core is given by on the tensile side and on the compressed side. The asymmetry in is given by on the tensile side and by on the compressed side. With , the core asymmetry is given by on the tensile side and by on the compressed side. For its asymmetry is provided by on the tensile side and by on the compressed side.
© 2009 Optical Society of America
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