Olonkins, Sergejs, Vladislavs Bickovs, Toms Salgals, Vjaceslavs Bobrovs, and Girts Ivanovs. 2017. “Investigation of Dual-Pump FOPA Performance in a 4-Channel 40 Gbps WDM Transmission System”. Elektronika Ir Elektrotechnika 23 (6):85-89. https://doi.org/10.5755/j01.eie.23.6.19699.