Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 21, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/21/2/025309
Keywords
fiber optic components; long-period gratings; optical devices fabrication; fiber optics sensors
Funding
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs Program
- Ministere de l'Education, du Loisir et du Sport du Quebec
- Polish Ministry of Science and Higher Education [R02-022-01]
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The paper presents for the first time a comparative study of long-period gratings (LPGs) written by point-by-point UV irradiation and by electrical arc discharges. These gratings were inscribed in a highly photosensitive boron co-doped fiber that can be considered as a suitable platform for LPG writing using either technology. The experimental transmission data for the manufactured LPG devices fit well when compared to the simulations we carried out in parallel. As a result of each of these writing processes, we were able to obtain a remarkably good quality of grating. Two reasons could explain the observed small differences between the spectra: a slight mismatch of the period of the gratings and an unintentional tapering of the fiber during the arc-based processes. We also found that the UV irradiation at lambda = 248 nm can cause clearly visible damage to the fiber's surface. As a result of the UV writing, a coupling to the asymmetrical cladding modes can take place. Moreover, the gratings written using the two technologies show a very similar refractive index and temperature-sensing properties. The only differences between them can come from a physical deformation of the fiber induced by the electric arc discharges.
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