Borkowski, Robert1; de Carvalho, Luis Henrique H.3; Silva, Edson Porto da3; Diniz, Júlio César M.3; Zibar, Darko1; de Oliveira, Júlio César R.F.3; Tafur Monroy, Idelfonso1
1 Department of Photonics Engineering, Technical University of Denmark2 Metro-Access and Short Range Systems, Department of Photonics Engineering, Technical University of Denmark3 Centro de Pesquisa e Desenvolvimento em Telecomunicações
We investigate optical prefiltering for 56Gbaud (224Gbit/s) electrical time-division multiplexed (ETDM) dual polarization (DP) quaternary phase shift keying (QPSK) transmission. Different transmitter-side optical filter shapes are tested and their bandwidths are varied. Comparison of studied filter shapes shows an advantage of a pre-emphasis filter. Subsequently, we perform a fiber transmission of the 56Gbaud DP QPSK signal filtered with the 65GHz pre-emphasis filter to fit the 75GHz transmission grid. Bit error rate (BER) of the signal remains below forward error correction (FEC) limit after 300km of fiber propagation.
Optical Fiber Technology, 2014, Vol 20, Issue 1, p. 39-43