Spectral Tuning of Long Period Fiber Gratings Fabricated by Femtosecond Laser Micromachining through Thermal Annealing

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Viveiros, D (Autor) FCUP; de Almeida, JMMM (Autor) FCUP; Coelho, L (Autor) FCUP; Vasconcelos, H (Autor) Outra; Amorim, VA (Autor) Outra; Maia, JM (Autor) Outra; Jorge, PAS (Autor) FCUP

Revista

Título: Proceedings

Vol. 15 Nº 1

Página Final: 4

ISSN: 2504-3900

Editora: MDPI

Outras Informações

ID Authenticus: P-00Q-SFS

DOI: 10.3390/proceedings2019015004

Abstract (EN): <jats:p>A femtosecond laser direct writing system was developed to explore the fabrication of long-period fiber gratings (LPFGs) in SMF28 fibers. The LPFGs, showing the mode LP1,6 at 1500 nm, were exposed to high-temperature annealing up to 950 °C. Modifications in the refractive index (RI) modulation are observed through a blue-shift in the LPFG attenuation bands and above 850 °C, the mode LP1,7 appear at 1600 nm. The wavelength sensitivity to external RI from 1.300 to 1.452 was estimated for both modes before and after annealing. Greater sensitivity was found for the higher order mode in the entire range reaching 2400 nm/RIU around 1.440.</jats:p>

Idioma: Inglês

Tipo (Avaliação Docente): Científica