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[摘要]：The induced variations of complex third-order susceptibilities in bent single-mode fiber at the standard operating wavelengths, 1300 and 1550 nm, is studied using Fizeau interferometry for radius of curvature ranges from 5 to 11 mm. At lambda = 1300 nm and at the minimum radius of curvature R 5 mm, the cladding real (dispersive) third-order susceptibility Re vertical bar chi((3))vertical bar = 1.167 x 10(-15) +/- 0.8% electrostatic unit (esu) on the tensile side, whereas on the compressed side it is 1.309 x 10(-15) esu. On the tensile side, the cladding imaginary (absorptive) third-order susceptibility Im vertical bar chi((3))vertical bar = 2.089 x 10(-18) +/- 0.8% esu, whereas on the compressed side it is 2.118 x 10(-18) esu. For lambda = 1550 nm, the cladding Re vertical bar chi((3))vertical bar and Im vertical bar chi((3))vertical bar on the tensile side are 1.116 x 10(-15) esu and 2.478 x 10(-18) esu, whereas on the compressed cladding side they are 1.259 x 10(-15) esu and 2.514 x 10(-18) esu, respectively. At lambda = 1300 nm and R = 5 mm, the core Re vertical bar chi((3))vertical bar is given by 1.318 x 10(-15) esu on the tensile side and 1.324 x 10(-15) esu on the compressed side. The asymmetry in Im vertical bar chi((3))vertical bar is given by 4.687 x 10(-17) esu on the tensile side and by 4.89 x 10(-17) esu on the compressed side. With lambda = 1550 nm, the core Re vertical bar chi((3))vertical bar asymmetry is given by 1.267 x 10(-15) esu on the tensile side and by 1.272 x 10(-15) esu on the compressed side. For Im vertical bar chi((3))vertical bar its core asymmetry is provided by 5.561 x 10(-17) esu on the tensile side and by 5.564 x 10(-17) esu on the compressed side. The observed asymmetry in the measured complex thirdorder susceptibility components for bent fibers is attributed to the nonlinear response of Young's modulus of fiber material. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [ DOI: 10.1117/ 1. OE. 51.1.015007] |
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