Field trial over 820 km installed SSMF and its potential Terabit/s superchannel application with up to 57.5-Gbaud DP-QPSK transmission

摘要

In this paper, we report the result of a field trial of 56-Gbaud (224-Gbit/s) and 57.5-Gbaud (230-Gbit/s) dual-polarization quadrature phase shift keying (DP-QPSK) coherent optical transmission over 820 km installed standard single mode fiber (SSMF). Offline digital signal processing (DSP) was applied for signal recovery and bit-error-rate (BER) counting in our field trial experiments, and HER performance well below the 7% overhead hard-decision forward error correction (FEC) error-free threshold (4.5 x 10(-3)) at 2(31)-1 pseudo random bit sequence (PRBS) pattern length has been achieved, with the best achievable BERs of 2 x 10(-4) (56-Gbaud) and 3 x 10(-4) (57.5-Gbaud), respectively. In parallel a 1.15-Tbit/s (5 x 230-Gbit/s) quasi-Nyquist spaced wavelength division multiplexing (WDM) superchannel transmission over the same 820 km optical field link (FL) was also investigated through numerical simulations based on the same 57.5-Gbaud DP-QPSK signal using 1% roll-off Nyquist pulse shaping with 60-GHz channel spacing, and the results indicate that the BER performance well below the 7% overhead hard-decision FEC error-free threshold (4.5 x 10(-3)) for the 1.15-Tbit/s DP-QPSK superchannel transmission can be achieved. (C) 2015 Elsevier B.V. All rights reserved.