Coherent WDM Transmission Over NANF for High-Capacity Intra-Data-Center Interconnection
Hailin Yang, Meng Xiang, Xinkuo Yu, Gai Zhou, Jianping Li, Yingying Wang, Shoufei Gao, Wei Ding, Songnian Fu, Yuwen Qin
Abstract
Coherent wavelength division multiplexing (WDM) transmission technique has been penetrated into the intra-data-center interconnection (Intra-DCI), due to its capability of high receiver sensitivity and efficient impairment mitigation. Here, we experimentally present a coherent WDM transmission of 40-channel 60 GBaud dual-polarization 16-level quadrature amplitude modulation (DP-16QAM) signals covering the extended C-band over 500 m homemade nested anti-resonant nodeless fiber (NANF) for high-capacity Intra-DCI. We also propose to utilize a simplified Volterra nonlinear equalizer (S-VNE) to mitigate the transmission nonlinearities originating from the transmistter hardware, resulting in 17.2% and 23% computational complextity reduction in terms of additions and multiplications with almost negligible performance penalty, in comparison with conventional VNE. As a result, the bit-error ratio (BER) of all 40 WDM channels can be lower than the 7% hard-decision forward error correction (HD-FEC) threshold of BER = 4.5×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> . We experimentally realize a net bit-rate of 448.6 Gbit/s per wavelength and a total transmission capacity of 17.9 Tbit/s.