Wavelength Shifts of Cladding-Mode Resonance in Corrugated Long-Period Fiber Gratings under Torsion
Resource
Applied Optics 42 (13): 2264-2272
Journal
Applied Optics
Journal Volume
42
Journal Issue
13
Pages
2264-2272
Date Issued
2003
Date
2003
Author(s)
Ivanov, Oleg V.
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.
SDGs
Other Subjects
Deformation; Elasticity; Electromagnetic field effects; Etching; Photoelasticity; Resonance; Torsional stress; Long period fiber gratings (LPFG); Diffraction gratings
Type
journal article
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