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Automated technique to inscribe reproducible long-period gratings using a CO2 laser splicer

Almeida, T. ; Oliveira, R. ; Rocha, Ana M. ; Facão, M. ; André, P.S ; Nogueira, R.N.

Optics Letters Vol. 42, Nº 10, pp. 1994 - 1997, May, 2017.

ISSN (print): 0146-9592
ISSN (online): 0146-9592

Journal Impact Factor: 3,772 (in 2008)

Digital Object Identifier: 10.1364/OL.42.001994

Abstract
We propose a technique to inscribe long period gratings (LPGs) in standard single-mode fibers (SSMFs). The proposed method uses a commercial CO2CO2 splicer that allows for the rotation of the fiber during laser irradiation, enabling a uniform exposure around the fiber. LPGs inscribed in SSMFs with different periods are presented. Gratings can be reproduced with a maximum difference between resonant wavelength values of less than 1 nm. Furthermore, it is possible to inscribe gratings with attenuation dips of −25  dB−25  dB while at the same time obtaining polarization-dependent losses as low as 2 dB.