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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 13 — May. 1, 2003
  • pp: 2264–2272

Wavelength Shifts of Cladding-Mode Resonance in Corrugated Long-Period Fiber Gratings under Torsion

Oleg V. Ivanov and Lon A. Wang  »View Author Affiliations


Applied Optics, Vol. 42, Issue 13, pp. 2264-2272 (2003)
http://dx.doi.org/10.1364/AO.42.002264


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Abstract

A finite deformation theory of elasticity and a theory of nonlinear photoelasticity are applied to describe the wavelength shifts of cladding-mode resonance in corrugated long-period fiber gratings under torsion. The deformation of fiber is found by use of the Murnaghan model of a solid elastic body. The quadratic photoelastic effect that is proportional to the second-order displacement gradient is investigated and compared with the classical photoelastic effect. The electromagnetic field in the twisted corrugated structure is presented as a superposition of circularly polarized modes of the etched fiber section. The wavelength shift is found to be proportional to the square of the twist angle. As predicted by our theory, a wavelength shift of the same nature has been found in a conventionally photoinduced long-period fiber grating.

© 2003 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors

Citation
Oleg V. Ivanov and Lon A. Wang, "Wavelength Shifts of Cladding-Mode Resonance in Corrugated Long-Period Fiber Gratings under Torsion," Appl. Opt. 42, 2264-2272 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-13-2264

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