Title :
Equalizer complexity for 6-LP mode 112 Gbit/s m-ary DP-QAM space division multiplexed transmission in strongly coupled Few-Mode-Fibers
Author :
Asif, Rameez ; Feihong Ye ; Morioka, Toshio
Author_Institution :
DTU Fotonik, Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
We have quantified equalizer complexity for transmitting dual-polarized 6-LP modes (LP01, LP11a, LP11b, LP21a, LP21b and LP02) of 112 Gbit/s m-ary QAM (m=4, 16, 32, 64, 256) single carrier signals over 20 km step-index few-mode fiber. The transmitted signals are strongly coupled and recovered using 12×12 multiple-input multiple-output (MIMO) adaptive digital signal processing (DSP). Time domain equalization (TDE) is realized to implement the linear adaptive MIMO module that is implemented in blind mode using conventional constant-modulus-algorithm (CMA) for finite impulse response (FIR) adaptive filter continuous update. Moreover, the benefit of employing hard-decision (HD) and soft-decision (SD) FEC for higher order QAM variants are also discussed.
Keywords :
FIR filters; MIMO communication; adaptive filters; adaptive signal processing; equalisers; forward error correction; optical modulation; quadrature amplitude modulation; space division multiplexing; time-domain analysis; CMA; FIR adaptive filter; LP-mode m-ary DP-QAM space division multiplexed transmission; MIMO adaptive digital signal processing; TDE; bit rate 112 Gbit/s; constant modulus algorithm; finite impulse response adaptive filter; forward error correction; hard decision FEC; higher order QAM; linear adaptive MIMO module; multiple input multiple output adaptive DSP; quantified equalizer complexity; soft decision FEC; step index few mode fiber; strongly coupled few mode fiber; time domain equalization; Digital signal processing; MIMO; Optical fiber filters; Optical fiber polarization; Optical transmitters;
Conference_Titel :
Networks and Communications (EuCNC), 2015 European Conference on
Conference_Location :
Paris
DOI :
10.1109/EuCNC.2015.7194090
