Abstract
Sampled fiber grating is a special superstructure fiber Bragg grating with a wide range of applications in many fields. In this work, based on drawing tower in-line fabrication system, a new preparation method of the sampled fiber grating is proposed and experimentally demonstrated. Experimental result shows that the obtained sampled fiber gratings possess dense reflection spectra, with a minimum reflection peak interval of only 0.09nm. This method exhibits promising application prospect in the fabrication of the high-quality sampled fiber grating. On the other hand, the spectral characteristics of the sampled fiber grating are analyzed when the sub-grating is affected by the external physical quantities such as, in this paper, strain. Wavelength shift and intensity change in the reflection peak of the spectra indicate that the grating is affected differently by micro strains, due to the different spatial positions along the axis of the sampled fiber grating. This work is aimed at exploring the potential applications of the sampled fiber grating in quasi-distributed micro-area sensing with the millimeter level.
Highlights
Sampled fiber gratings (SFGs), known as special superstructure fiber Bragg gratings, have been widely researched and used in the field of multi-parameter sensing, optical filters, and multi-wavelength laser [1,2,3,4,5,6]
Yu ZHENG et al.: Drawing Tower In-Line Fabrication and the Spectrum Analysis of Sampled Fiber Grating this method is limited by the length and period of the amplitude mask and phase mask, the preparation operation is not flexible
SFG can be regarded as a series of ultra-short fiber Bragg grating (FBG) arranged continuously in certain spatial intervals
Summary
Yu ZHENG et al.: Drawing Tower In-Line Fabrication and the Spectrum Analysis of Sampled Fiber Grating this method is limited by the length and period of the amplitude mask and phase mask, the preparation operation is not flexible. By using the point-by-point scanning method, the sampled gratings with different parameters can be flexibly prepared by controlling the displacement distance and slit width [8]. In this way, only one sub-grating can be inscribed by each laser source, leading to that the SFGs of almost all parameters can be fabricated. We combine the point-by-point scanning method and the FBG in-line fabrication technology, try to fabricate the sampled fiber gratings with high quality and very short peak interval by using our customized drawing tower. The spectral characteristics of the sampled fiber grating are analyzed in order to explore the potential applications of the SFG in quasi-distributed micro-area sensing
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