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Transmission performance of 4D 128SP-QAM with forward error correction coding

: Alreesh, S.; Schmidt-Langhorst, C.; Frey, F.; Berenguer, P.W.; Schubert, C.; Fischer, J.K.


IEEE Photonics Technology Letters 27 (2015), No.7, pp.744-747
ISSN: 1041-1135
Deutsche Forschungsgemeinschaft DFG
Bundesministerium für Bildung und Forschung BMBF
Bundesministerium für Bildung und Forschung BMBF
Journal Article
Fraunhofer HHI ()

The performance of the 4-D 128SP-QAM format is experimentally investigated in a Nyquist-wavelength division multiplexing system for two different forward error correction (FEC) scenarios. Two soft-decisions FEC schemes are experimentally evaluated for 128SP-QAM, namely, a turbo product code (TPC) and a low-density parity-check (LDPC) code. The results show that after full convergence the LDPC code outperforms the TPC with respect to coding gain at a bit error ratio of 10(-8). However, it requires more decoding iterations to achieve convergence toward an optimum performance state.