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Fast inscription of long period gratings in microstructured polymer optical fibers

Min, R. ; Marques, C. ; Nielsen, K. ; Bang, O. ; Ortega, B.

IEEE Sensors Journal Vol. 18, Nº 5, pp. 1919 - 1923, March, 2018.

ISSN (print): 1530-437X
ISSN (online):

Journal Impact Factor: 1,762 (in 2014)

Digital Object Identifier: 10.1109/JSEN.2018.2791663

Abstract
We demonstrate 20 dB long period grating (LPG) fast inscription in microstructured polymer optical fibers (mPOFs) using a point-by-point technique obtaining an LPG total length of 25 mm. Two 248 nm UV laser pulses of 15 ns duration have been
employed for every inscription point, which means a time reduction by more than 21 times compared with the fastest
inscription time already reported in literature. The device has been fabricated in a single-mode mPOF with a core that has been doped with benzyl dimethyl ketal (BDK) for photosensitivity enhancement. Moreover, we characterize the strain and temperature responses and the stability of the fabricated gratings response under different conditions in order to assess the viability for different applications.