Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/31245
Title: Modelling, fabrication and characterization of long period gratings inscribed by femtosecond laser
Author: Vieira, Joana
Paixão, Tiago
Antunes, Paulo
Facão, Margarida
Rocha, Ana M.
Keywords: Long period grating
Femtosecond laser
Coupled mode theory
Refractive index modulation
Issue Date: Mar-2021
Publisher: Elsevier
Abstract: In this paper, we present a method to fabricate long period gratings in standard telecommunications single mode fibers (SSMF), using a femtosecond laser system. A numerical model based on the coupled mode theory was developed and implemented with the aim to guide and improve the inscribing technique. This model takes in consideration the specifications of the inscription technique. Using this model, we have analyzed the behavior of the gratings for different irradiation lengths per period, refractive index modulation values and considering first and second order coupling with different cladding modes. LPGs inscribed in SSMF are presented, its transmission spectra were analyzed and a good agreement between the numerical results and the experimental LPGs was achieved. The sensitivity to temperature of the produced LPGs was also characterized, attaining different sensitivities for different attenuation peaks.
Peer review: yes
URI: http://hdl.handle.net/10773/31245
DOI: 10.1016/j.ijleo.2021.166283
ISSN: 0030-4026
Publisher Version: https://www.sciencedirect.com/science/article/abs/pii/S0030402621000255
Appears in Collections:DFis - Artigos
I3N-FSCOSD - Artigos
IT - Artigos

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