Origin of coupling to antisymmetric cladding modes in arc-induced long-period fiber gratings

Abstract

We study the origin of antisymmetric perturbation of the fiber in arc-induced long-period gratings that couple the core mode into the antisymmetric cladding modes. We demonstrate that this perturbation is caused by a temperature gradient in the fiber, which is induced, in turn, by a temperature gradient in the arc discharge.

Nonlinear deformations of a cylindrical pipe with pre-stressed thin coatings

“…Analysis of the effect of torsion on optical characteristics allows the existing sensors to be improved and new sensors to be developed for the parameters of torsion and rotation [20, 21]. A nonlinear change in the fiber dielectric tensor caused by twisting leads to a change in the propagation constants of the core and cladding modes [22]. Residual stranding stresses can affect the polarization mode dispersion [23].…”