Moustafa Hussein Aly, Engy Khalil El Nayal, Heba Ahmed Fayed, and Hanan Mahmoud El-Gammal, “A Comprehensive Study on EDFA Gain Flattening for WDM Transmission using Cascaded Fiber Bragg Gratings”, J. Adv. Res. Appl. Sci. Eng. Tech., vol. 40, no. 1, pp. 96–108, Feb. 2024.