Spectrally-efficient 17.6-Tb/s DWDM optical transmission system over 678 km with pre-filtering analysis

• Main Authors: L. H. H. Carvalho, E. P. Silva, R. Silva, J. P. K Perin, J. C. R. F. Oliveira, M. L. Silva, P. P. G. Cardoso, A. Paradisi
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Microondas e Optoeletrônica; Sociedade Brasileira de Eletromagnetismo
• Series: Journal of Microwaves, Optoelectronics and Electromagnetic Applications
• Subjects: Coherent detection; high-speed optical systems; modulation format; optical filtering; optical networks; spectral efficiency
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-10742013000200018&lng=en&tlng=en
• ISSN: 2179-1074

We present and analyze a 17.6-Tb/s DWDM optical transmission composed of 79 channels with 224-Gb/s RZ-DP-16QAM modulation format per-channel and coherent detection. A maximum reach of 678 km is obtained with an optical recirculation loop composed by 226 km of pure-silica core fibers and EDFA amplification only in a 50-GHz grid system with spectral efficiency of 4.2-b/s/Hz. Also, a 25-GHz Gaussian optical pre-filter is applied to each channel and the same reach of 678 km is obtained in a 37.5-GHz channel grid system with spectral efficiency of 5.6-b/s/Hz. These results demonstrate a 33% system capacity improvement without transmission penalties.