Study the effect of Pitch size When the number of rings of the second air gaps on the dispersion profile of Photonic Crystal Fibers. Tikrit Journal of Pure Science, [S. l.], v. 20, n. 3, p. 148–155, 2023. DOI: 10.25130/tjps.v20i3.1198. Disponível em: https://tjpsj.org/index.php/tjps/article/view/1198. Acesso em: 10 nov. 2026.