Effects of cladding radius on the optical characteristics of long-period fiber gratings
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Abstract:
Using three-layer vector field model, the dispersion characteristics and spectral response of long-period fiber gratings (LPFGs) with different cladding radii are analyzed. Both the numerical and experimental results demonstrate that LPFG’s resonant wavelengths shift towards much longer wavelength and the transmission depth is strengthened significantly by decreasing cladding radius. When the cladding radius is less than 20 μm, only a single resonant peak over a wavelength range of 600 nm (from 1200 nm to 1800 nm) is achieved, and the sensitivity of LPFG to external refractive index is enhanced significantly.
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Project Supported:
the National Natural Science Foundation of China(No.61007007);the Talents of North China University of Technology(No.CCXZ201307);the Foundation of Beijing Municipal Committee of CPC Organization Department(No.2012D005002000001);the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions
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