Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9786222 | Optics Communications | 2005 | 5 Pages |
Abstract
Based on the Mach-Zehnder effect between the core mode and the cladding modes, the interference fringes are formed by a pair of cascaded long-period fiber gratings (CLPFGs). Theoretical analyses show that the spectral spacing and the wavelength of these fringes are functions of the waveguide dispersion factor γ, which is a characterizing parameter to LPFG and with theoretical and applicational significance. By measuring the characteristics of the transmission spectra of CLPFGs, the absolute value of γ can be obtained. At the same time, the thermo-optic coefficient of effective refractive index difference between core and cladding modes, μ, can also be obtained by measured the temperature sensitivity of these fringes. In the experiments, â£Î³â£ and μ were measured by this method to be 0.874 and 4.08 Ã 10â5 °Câ1, respectively, for LPFGs with period of 450 μm and with a HE14 resonant peak at 1554 nm.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Kan Gao, Zujie Fang,