O. Ozoliņš and Ģ. Ivanovs, “Realization of Optimal FBG Band–Pass Filters for High Speed HDWDM”, ELEKTRON ELEKTROTECH, vol. 92, no. 4, pp. 41–44, Apr. 2009, Accessed: Jan. 23, 2026. [Online]. Available: https://eejournal.ktu.lt/index.php/elt/article/view/10224