El-Nahal, Fady. “Wavelength Division Multiplexing Passive Optical Networks (WDM PONs) With Downstream DPSK and Upstream Remodulated OOK Using Injection-Locked Fabry-Perot Laser Diodes (FP-LDs)”. Photonics Letters of Poland 7, no. 4 (December 31, 2015): pp. 127–129. Accessed November 20, 2024. http://m.photonics.pl/PLP/index.php/letters/article/view/7-45.