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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 19 — Jul. 1, 2009
  • pp: 3818–3822

Nonlinearity in bent optical fibers

Fouad El-Diasty and Hatem A. El-Hennawi  »View Author Affiliations


Applied Optics, Vol. 48, Issue 19, pp. 3818-3822 (2009)
http://dx.doi.org/10.1364/AO.48.003818


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Abstract

An interferometric method to study the induced variations of nonlinear parameters in bent optical fiber such as third-order susceptibility χ ( 3 ) and second-order refractive index n 2 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 1550 nm and at radii of curvature from 5 to 11 mm . At the minimum radius of curvature R = 5 mm , the cladding χ ( 3 ) = 4.131 × 10 15 esu on the tensile side, whereas on the compressed side it is 4.601 × 10 15 esu for λ = 1300 nm . On the tensile side n 2 = 1.09 × 10 13 esu , whereas on the compressed side it is 1.216 × 10 13 esu . For λ = 1550 nm , the cladding χ ( 3 ) and n 2 on the tensile side are 3.96 × 10 15 esu and 1.055 × 10 13 esu , whereas in the compressed cladding side they are 4.435 × 10 15 esu and 1.174 × 10 13 esu , respectively. At λ = 1300 nm and R = 5 mm , the core χ ( 3 ) is given by 4.631 × 10 15 esu on the tensile side and 4.649 × 10 15 esu on the compressed side. The asymmetry in n 2 is given by 1.223 × 10 13 esu on the tensile side and by 1.227 × 10 13 esu on the compressed side. With λ = 1550 nm , the core χ ( 3 ) asymmetry is given by 4.46 × 10 15 esu on the tensile side and by 4.477 × 10 15 esu on the compressed side. For n 2 its asymmetry is provided by 1.181 × 10 13 esu on the tensile side and by 1.185 × 10 13 esu on the compressed side.

© 2009 Optical Society of America

OCIS Codes
(060.2400) Fiber optics and optical communications : Fiber properties
(190.4370) Nonlinear optics : Nonlinear optics, fibers

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: April 29, 2009
Manuscript Accepted: June 12, 2009
Published: June 25, 2009

Citation
Fouad El-Diasty and Hatem A. El-Hennawi, "Nonlinearity in bent optical fibers," Appl. Opt. 48, 3818-3822 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-19-3818

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