Title :
A faster-than-Nyquist PDM-16QAM scheme enabled by Tomlinson-Harashima precoding
Author :
Chang, D. ; Omomukuyo, O. ; Dobre, O. ; Venkatesan, R. ; Gillard, P.
Author_Institution :
Memorial Univ. of Newfoundland, St. John´s, NL, Canada
Abstract :
We present and numerically demonstrate a polarization-division multiplexing 16-ary quadrature amplitude modulation faster-than-Nyquist (FTN-PDM-16QAM) system enabled by the Tomlinson-Harashima precoding (THP). The THP module is located before the polarization separation module and it is shown that the modulo operator of the THP module at the receiver needs to be removed in order to fully optimize the performance of the soft-decision forward error correction (FEC). The impact of various parameters such as the modulo size factor, the 3-dB bandwidth and roll-off factor of the Nyquist filter on the performance of the FTN-PDM-16QAM system are also investigated. In addition, we compare the FTN-PDM-16QAM system with the PDM-16QAM Nyquist system in terms of the system performance and implementation complexity.
Keywords :
filtering theory; forward error correction; modulation coding; optical modulation; optical receivers; precoding; quadrature amplitude modulation; FTN-PDM 16-ary quadrature amplitude modulation system; Nyquist filter roll-off factor; THP module; Tomlinson-Harashima precoding; faster-than-Nyquist polarization division multiplexing 16QAM system; optical receiver; polarization separation module; soft decision FEC performance; soft decision forward error correction performance; Bandwidth; Complexity theory; Decision feedback equalizers; Maximum likelihood estimation; Modulation; Optical filters; 16QAM; Tomlinson-Harashima precoding; faster-than-Nyquist; polarization-division multiplexing;
Conference_Titel :
Transparent Optical Networks (ICTON), 2015 17th International Conference on
Conference_Location :
Budapest
DOI :
10.1109/ICTON.2015.7193359
