Hussain, N.A. (2015) “Wavelength Division Multiplexing Passive Optical Network modeling Using Optical System Simulator”, Al-Khwarizmi Engineering Journal, 11(3), pp. 61–71. Available at: https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/255 (Accessed: 8 January 2026).