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Unrepeatered Nyquist PDM-16QAM transmission over 364 km using Raman amplification and multi-channel digital back-propagation  
Description:
Transmission of a net 467-Gb/s PDM-16QAM Nyquistspaced superchannel is reported with an intra-superchannel net spectral efficiency (SE) of 6.6 (b/s)/Hz, over 364-km SMF-28 ULL ultra-low loss optical fiber, enabled by bidirectional second-order Raman amplification and digital nonlinearity compensation. Multi-channel digital backpropagation (MC-DBP) was applied to compensate for nonlinear interference; an improvement of 2 dB in Q2 factor was achieved when 70-GHz DBP bandwidth was applied, allowing an increase in span length of 37 km. 

Publication year:    2015
Reference:    Galdino, L.; Tan, M.; Lavery, D.; Rosa, P.; Maher, R.; Phillips, I.D.; Castañón, J.D.A.; Harper, P.; Killey, R.I.; Thomsen, B.C.; Makovejs, S.; Bayvel, P.; “Unrepeatered Nyquist PDM-16QAM transmission over 364 km using Raman amplification and multi-channel digital back-propagation”, Optics Letters, vol: 40; Páginas: 3025 – 3028 (2015); doi: 10.1364/OL.40.003025
Magazine:    Optics Letters
Running:    No.
 
Investigación financiada por el Ministerio de Ciencia e Innovación y la Agencia Estatal de Investigación
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