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Indexed by:会议论文

Date of Publication:2008-11-07

Included Journals:EI、CPCI-S、Scopus

Page Number:102-+

Key Words:Fiber Bragg gratings; fiber optic sensors; microstructured optic fibers; photonic bandgap fibers

Abstract:We report on fiber Bragg gratings in all-solid photonic bandgap fiber that composed of a triangular array of high-index Ge-doped rods in pure silica background with fluorine-doped index-depressed layer surrounding the Ge-doped rod. Fiber Bragg gratings were photowritten with 193 nm ArF excimer laser and characterized for their response to strain, temperature, bending and torsion. These gratings couple light from the forward core mode to not only backward core mode but also backward rod modes. This results in multiple resonance peaks in the reflection spectrum. All resonance wavelengths exhibited the same temperature and strain response with coefficient similar to that of Bragg gratings in standard single-mode fiber. The strength of the resonance peaks corresponding to the backward rod modes showed high sensitivity to bending and torsion.