Open AccessEffect of macro-bending on resonant wavelength and intensity of long-period gratings in photonic crystal fiber
Author(s) -
Zonghu He,
Yinian Zhu,
Henry Du
Publication year - 2007
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.15.001804
Subject(s) - optics , materials science , photonic crystal fiber , bending , curvature , long period fiber grating , wavelength , laser , optical fiber , optoelectronics , graded index fiber , fiber optic sensor , physics , composite material , geometry , mathematics
We report the spectral characteristics of CO(2)-laser inscribed long-period gratings (LPGs) in endlessly single mode photonic crystal fiber (PCF) subject to macro-bending. The coupling modes as a result of bending were studied by examining the shifts of resonant wavelengths, the splits of attenuation bands, and the variation in coupling strength of the transmission spectra. A bending coefficient of ~ 27.9 nm.m was determined in the PCF at 180 degrees rotational orientation relative to the point of laser inscription in the curvature range from 2.6 m(-1) to 3.5 m(-1). Compared with conventional fiber LPGs fabricated using the same method, the PCF-based LPGs possess higher sensitivity both to bending and orientation, making them promising for sensor applications.