Open AccessStudy on characteristics of a CO2-laser-induced ultra-long-period fiber grating
Author(s) -
Tao Zhu,
Yunjiang Rao,
Mo Qiu-Ju,
Wang Jiu-ling
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.5287
Subject(s) - materials science , refractive index , grating , cladding (metalworking) , optics , long period fiber grating , torsion (gastropod) , fiber bragg grating , laser , graded index fiber , cladding mode , optoelectronics , polarization maintaining optical fiber , fiber optic sensor , fiber , composite material , physics , medicine , wavelength , surgery
A novel ultra-long-period fiber grating with periods up to several millimeters induced by using CO2 laser pulses is reported and discussed based on the mode coupling theory. The refractive index change occurs mainly within the cladding area of the fiber and has an unsymmetrical distribution on the cross-section of the ULPFG. The characteristics of temperature, strain, torsion and the effect of the refractive index of environment were investigated in theory and by experiment. The experimental results showed that different resonant peaks of the ULPFG have different sensitivities in the characteristics above mentioned, which offers possible applications in optical communications and sensing.