Nadiatulhuda Zulkifli , Auwalu Usman , Mohd Rashidi Bn Salim , Kharina Khairi. “Optical Link Fault Detection and Localization in Passive Optical Network Domain”. International Journal of Advanced Science and Technology, Vol. 29, no. 10s, May 2020, pp. 665 -74, http://sersc.org/journals/index.php/IJAST/article/view/14494.