Costa, J. R. & Paiva, C. (1998). Multichannel soliton amplification in Erbium-Doped fiber amplifiers. Microwave and Optical Technology Letters, 19(4), 309?313. https://doi.org/10.1002/(SICI)1098-2760(199811)19:4%3C309::AID-MOP19%3E3.0.CO;2-X