mumtaz aldabagh, sama, سما, Manaf Saeed, and مناف. “The Influence of Relative Refractive Index and Core Diameter on Properties of Single-Mode Optical Fiber”. Journal of Education and Science (JES) 29, no. 4 (December 1, 2020): 124–139. Accessed August 4, 2025. https://rjps.uomosul.edu.iq/index.php/edusj/article/view/18395.