PROJECT TITLE :

XPM Model-Based Digital Backpropagation for Subcarrier-Multiplexing Systems

ABSTRACT:

An advanced digital backpropagation (ADBP) algorithm is proposed to compensate fiber nonlinearities in subcarrier-multiplexing (SCM) systems. We tend to derive the analytical expression and describe the implementation of the ADBP. Additionally, the computational complexity of the ADBP as well as the conventional low-pass-filter-assisted DBP (LDBP) is analyzed and compared. In a thirty four.94 Gbaud/s single channel SCM transmission experiment, we demonstrate that the proposed ADBP with only 2 steps (forty spans/step for QPSK at 6400 km and sixteen spans/step for 16 QAM at 2560 km) contains a comparable performance to the LDBP algorithm with forty steps (2 spans/step) for QPSK and eight steps (four spans/step) for sixteen QAM, respectively. Moreover, compared to single carrier (SC) systems using solely linear compensation (LC), the ADBP algorithm with forty spans/step for QPSK and sixteen spans/step for sixteen QAM can extend the utmost reach by forty nine.7% and 27.three% for the 2 formats, respectively. The contribution to the reach extension consists of nineteen.7% and 23.6% that are as a result of the nonlinear compensation algorithm when compared to SCM systems using LC for QPSK and sixteen QAM, respectively. The remainder of the improvements is owing to the use of the SCM theme. Finally, simulations of sixty Gbaud/s systems show additional enhancements using the ADBP schemes compared to the LDBP schemes, indicating the benefits of ADBP in future high capability optical transmission systems.