Open AccessOptically induced long-period fiber gratings for guided mode conversion in few-mode fibers
Author(s) -
N. Andermahr,
Carsten Fallnich
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.004411
Subject(s) - optics , grating , materials science , energy conversion efficiency , long period fiber grating , fiber laser , fiber bragg grating , beam (structure) , optical fiber , diffraction grating , graded index fiber , optoelectronics , physics , fiber optic sensor
We propose and demonstrate guided mode conversion by an optically induced long-period fiber grating (OLPG). The beating of two guided modes excited by a nanosecond pulsed laser beam is used to induce a refractive index grating via the Kerr effect. This grating converts a counter-propagating continuous-wave beam from the LP(01) to the LP(11) mode. Numerical simulations using a beam propagation method show that a full conversion is possible. Experimentally, a mode conversion with an efficiency of about 50% is firstly demonstrated.