mumtaz aldabagh sama, سما, Saeed M, مناف. The influence of relative refractive index and core diameter on properties of single-mode optical fiber. EDUSJ [Internet]. 2020 Dec. 1 [cited 2025 Aug. 4];29(4):124-39. Available from: https://rjps.uomosul.edu.iq/index.php/edusj/article/view/18395