Experimental Study on Etched Micro-Structured Fiber Bragg Grating

Abstract:

Here based on the combination of Comsol and the transmission matrix of Matlab, the spectrums of etched micro-structured gratings are simulated and two different modes of etched micro-structured fiber gratings are made in experiment. Etched micro-structured fiber grating is formed by using hydrofluoric acid (HF)-based wet chemical etching or femtosecond laser etching. This can reduce the clad layer along a standard grating partly or entirely and change the transmission feature of the grating. As a result, the thinner cladding layer changes the core propagation features and thus induces a phase delay on the guided mode, leading to the formation of a defect state inside the original grating band-gap in agreement with the phase shift grating theory. The defect state is mainly influenced by three parameters: the length and depth of the perturbation and the surrounding refractive index (SRI).

• Periodical: Applied Mechanics and Materials (Volumes 130-134)
• Pages: 4061-4064
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.130-134.4061
• Online since: October 2011
• Authors: Yin Fei Yang, Ye Cao, Zheng Rong Tong, Xiu Feng Yang
• Keywords: Defect, Etched Micro-Structured Grating, Phase Shift, Surrounding Refractive Index

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