Abstract
Based on the full vector complex coupled mode theory, a detailed analysis is made on the transmission spectrum characteristics of tilted long period fiber gratings. New transmission peaks are observed, which are located beside the long wavelength side of each transmission peak in the transmission spectrum of normal long period fiber gratings. The emerging transmission peaks are quite sensitive to both the grating tilted angle and the surrounding refractive index, and the corresponding relationship is discussed. Furthermore, a novel sensing characteristic is investigated about the tilted long period fiber gratings, which is related to the transmission resonant wavelength and peak amplitude.
Highlights
As important passive optical devices, fiber Bragg gratings (FBGs) and long period fiber gratings (LPFGs) are widely used in the fiber optical communication and sensing fields [1,2,3,4,5,6]
New transmission peaks are observed, which are located beside the long wavelength side of each transmission peak in the transmission spectrum of normal long period fiber gratings
Qi LI et al.: Analysis of Transmission Characteristics of Tilted Long Period Fiber Gratings With Full Vector Complex Coupled Mode Theory 159 when there is a tilt of the grating plane, this rule is broken; vector fiber modes with dissimilar azimuthal orders can couple with each other
Summary
As important passive optical devices, fiber Bragg gratings (FBGs) and long period fiber gratings (LPFGs) are widely used in the fiber optical communication and sensing fields [1,2,3,4,5,6]. Similar to the LPFGs, tilted long period fiber gratings (TLPFGs) are transmission gratings without back reflectance. An analysis is made on transmission characteristics of TLPFGs with the full vector complex coupled mode theory (FV-CCMT). This theoretical model can be used to analyze the tilted fiber gratings under different scenarios effectively. Qi LI et al.: Analysis of Transmission Characteristics of Tilted Long Period Fiber Gratings With Full Vector Complex Coupled Mode Theory 159 when there is a tilt of the grating plane, this rule is broken; vector fiber modes with dissimilar azimuthal orders can couple with each other. The influence of the tilted angle ( ) and the refractive index of the surrounding medium ( ns ) are discussed
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