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24 September 2005 Influence of etching on the refractive index sensitivity of tilted fiber Bragg gratings and long period gratings
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Abstract
Tilted fiber Bragg gratings and long period gratings enhance the coupling to the cladding modes and constitute excellent refractometers. In this paper, we study how the cladding diameter influences the coupling to the cladding modes for these two types of gratings. Our experiments are made on different tilted Bragg gratings, characterized by different tilt angles. For every grating, we study the evolution of the sensitivity to the surrounding refractive index as function of the cladding radius. We also investigate two ways to correlate the spectral evolution of a tilted fiber Bragg grating with respect to the external refractive index. The first method is based on the local monitoring of the transmitted spectrum while the second one makes use of the correlation between a reference spectrum and a perturbed spectrum. These methods offer both very good accuracy and repeatability.
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C. Caucheteur, M. Debliquy, K. Chah, F. Lhommé, D. Lahem, and P. Mégret "Influence of etching on the refractive index sensitivity of tilted fiber Bragg gratings and long period gratings", Proc. SPIE 5952, Optical Fibers: Applications, 59521J (24 September 2005); https://doi.org/10.1117/12.622898
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