Dr. Huan Chen Profile

Dr. Huan Chen

at ZTE Corp.

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Proceedings Article | 15 December 2022 Paper

Experimental verification of EGN model in 11-THz C+L broadband 400G real-time transmission with digital sub-carrier multiplexing

Rui Tang, Xin Zhao, Huan Chen, Yuting Du, Hu Shi, Zhenhua Feng

Proceedings Volume 12478, 1247840 (2022) https://doi.org/10.1117/12.2654898

KEYWORDS: Signal attenuation, Optical fibers, Systems modeling, Multiplexing, L band, Wavelength division multiplexing, Optical amplifiers, Modulation, Computer simulations

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To support high-quality network plan, reliable operation and efficient service provisioning, the quality of transmission estimation (QoT-E) tool, which predicts the penalty of transmission impairments, is highly required. Among these channel impairments, non-linear-interference noise (NLIN) in high-speed, large-capacity and long-reach transmission systems with advanced modulation formats and powerful digital signal processing (DSP) algorithms is complex and difficult to be accurately estimated, thus an precise and practical model of NLIN is desperately desired as one of the key components for QoT-E. Nowadays, 400Gb/s/ch combined with multi-band transmission has become a research hotspot achieving larger capacity without deploying new fibers. However, in this multi-band scenario, the interaction of NLIN with the stimulated Raman scattering (SRS) must be properly considered. In this paper, an equivalent attenuation coefficient assisted enhanced Gaussian noise (EGN) model which considers the impact of SRS on the nonlinear interference in C+L band, is proposed and experimentally verified. The real-time experiments of 400Gb/s/ch transmission system in 11-THz C+L band over 14x75 km G.652 and 14x100 km G.654E fiber links are carried out using coherent transponders modulated with 91.6 GBaud digital sub-carrier multiplexing (DSCM) based probabilistic constellation shaping (PCS) 16QAM format, achieving a net spectral efficiency of 4 bit/s/Hz. The experimental results show that the maximum deviation of NLI induced OSNR penalty at different frequencies across the whole C+L band is found to be less than 0.22 dB. This work could potentially provide an effective and accurate tool for QoT-E estimation in broadband C+L or even multiband systems, paving the way for intelligent management and control of high-capacity and flexible optical networks.

Proceedings Article | 1 November 2021 Paper

Experimental validation of modified EGN model in real-time 400G/800G transmission with PCS and digital sub-carrier multiplexing

Rui Tang, Wenyu Zhao, Huan Chen, Hu Shi, Zhenhua Feng

Proceedings Volume 12057, 1205744 (2021) https://doi.org/10.1117/12.2606811

KEYWORDS: Systems modeling, Optical amplifiers, Multiplexing, Modulation, Wavelength division multiplexing, Optical networks, Transponders, Tolerancing, Nonlinear optics

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An accurate and practical model of non-linear-interference noise (NLIN) is the key enabler for the quality of transmission (QoT) estimation tool, which predicts the penalty of transmission impairments. For next generation 400G/800G coherent transponders, probabilistic constellation shaping (PCS) and digital sub-carrier multiplexing (DSCM) are used to provide better transmission performance and finer data rate adaptability. However, to the best of our knowledge, there is little information so far about how to evaluate the penalty of NLIN in 400G/800G systems with PCS and DSCM, as traditional Gaussian noise (GN) or enhanced GN (EGN) model can not deal with such a problem directly. In this paper, we propose a modified EGN model to take into account the impact of PCS and DSCM on 400G/800G transmission system by performing simulations and experiments. To fully validate the accuracy of our model, a set of real-time experiments of 400G and 800G transmission system within 100/112.5GHz channel spacing, using 95GBaud commercial coherent modules. The 400G real-time transmission platform includes 10 spans of 75km G.652 fiber and all EDFA amplification is used, while the 800G link is limited to 5 spans G.652 fiber due to its higher OSNR requirement. The experiment result shows that the maximum estimation deviation of non-linearity induced OSNR penalty for the modified EGN model is about 0.3 dB under different transmission scenarios. We believe our work could potentially provide an effective and accurate tool for QoT estimation, paving the way for future physical-layer-aware management and control of high-capacity and flexible optical networks.

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