Open AccessInscription of Bragg gratings in nanostructured graded index single-mode fibers
Author(s) -
Tomasz Osuch,
Alicja Anuszkiewicz,
Konrad Markowski,
Adam Filipkowski,
Dariusz Pysz,
Rafał Kasztelanic,
Ryszard Stępień,
Mariusz Klimczak,
Ryszard Buczyński
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.013721
Subject(s) - materials science , photonic crystal fiber , optics , core (optical fiber) , fiber , fiber bragg grating , single mode optical fiber , optical fiber , all silica fiber , plastic clad silica fiber , refractive index , rod , sensitivity (control systems) , graded index fiber , fiber optic sensor , optoelectronics , composite material , wavelength , physics , medicine , alternative medicine , pathology , electronic engineering , engineering
We report on efficient inscription of fiber Bragg gratings (FBGs) in a new type of single mode fiber with nanostructured core and with an effective parabolic graded index profile, using the standard phase mask method and a 248 nm pulsed laser. A nanostructured core allows to obtain high concentration of GeO 2 in subwavelength glass rods and simultaneously to maintain low average germanium dopant level of silica similarly to standard single mode fibers. We showed that in a nanostructured core fiber, a factor of 3 better efficiency in gratings inscription was achieved, although the fiber has 20% lower average concentration of GeO 2 with respect to SMF-28. In the nanostructured fiber we obtained a significant improvement in temperature sensitivity, while the strain sensitivity of FBG in nGRIN optical fiber is the same as in case of standard single-mode fiber (SMF-28). We have measured the strain sensitivity of 0.72 × 10 -6 1/με (1.11 pm/με@1.53μm), and the temperature sensitivity is about 30% higher than for FBG in SMF-28 and equals to 10.2 × 10 -6 1/K (15.6 pm/K@1.53μm).