@article{carvalho_silva_silva_perin_oliveira_silva_cardoso_paradisi_2013,  title={Spectrally-efficient 17.6-Tb/s DWDM optical transmission system over 678 km with pre-filtering analysis},  volume={12},  ISSN={2179-1074},  url={https://doi.org/10.1590/S2179-10742013000100018},  DOI={10.1590/S2179-10742013000100018},  number={1},  journal={Journal of Microwaves, Optoelectronics and Electromagnetic Applications},  publisher={Sociedade Brasileira de Microondas e Optoeletrônica e Sociedade Brasileira de Eletromagnetismo},  author={Carvalho, L. H. H. and Silva, E. P. and Silva, R. and Perin, J. P. K and Oliveira, J. C. R. F. and Silva, M. L. and Cardoso, P. P. G. and Paradisi, A.},  year={2013},  month={Jun},  pages={229–237} }