Open AccessPer-symbol-based digital back-propagation approach for PDM-CO-OFDM transmission systems
Author(s) -
Wen-Chih Peng,
Hidenori Takahashi,
Ramon Casellas,
Takehiro Tsuritani
Publication year - 2013
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.001547
Subject(s) - orthogonal frequency division multiplexing , cyclic prefix , fast fourier transform , computer science , quadrature amplitude modulation , electronic engineering , polarization division multiplexing , multiplexing , modulation (music) , qam , transmission (telecommunications) , phase shift keying , algorithm , optics , signal processing , digital signal processing , telecommunications , bit error rate , physics , computer hardware , engineering , channel (broadcasting) , acoustics
For polarization-division-multiplexing coherent optical orthogonal frequency division multiplexing (PDM-CO-OFDM) systems, we propose a per-symbol-based digital back-propagation (DBP) approach which, after cyclic prefix removal, conducts DBP for each OFDM symbol. Compared with previous DBP, this new proposal avoids the use of inefficient overlap-and-add operation and saves one fast Fourier transform (FFT) module, therefore simplifying the hardware implementation. Transmitting a 16-QAM, 42.8-Gb/s PDM-CO-OFDM signal over 960-km standard single mode fiber (SSMF), we compare the previous and the proposed DBP approaches with different receiver's sampling rates and different step lengths in each DBP iteration, and found that the proposed DBP can achieve a similar performance as that of the previous DBP while enjoying a simpler implementation. We have also specifically introduced a small self-phase modulation (SPM) model for DBP and demonstrated its feasibility with the same experimental setup.