Shulou(Shulou.com)11/24 Report--

CTOnews.com May 10 news, following the world's first 3.03 Pbit / s single-mode 19-core optical fiber transmission system experiment in October 2022, the national key laboratory of optical communication technology and network of China Xinke Group has once again refreshed the world record for single-mode multi-core optical fiber transmission capacity.

By optimizing and upgrading the optical transmission system architecture and digital signal processing algorithms, the researchers optimized some key optoelectronic devices in the system architecture while keeping the spectral width of the S+C+L channel constant, and equalized the ultra-wide optical domain of the system spectrum to further improve the performance of the transmission channel in different bands. Finally, the experiment of single-mode 19-core optical fiber transmission system with total transmission capacity 4.1Pb / s and net transmission capacity 3.61p / s is realized, which is increased by nearly 40%. This is also the highest experimental capacity of domestic optical fiber transmission system at present.

Tu Yuan PixabayCTOnews.com found that the results of this experiment have been published in IEEE Photonic Technology KuaiBao, DOI: 10.1109/LPT.2023.3274310.

According to reports, the R & D team optimized and upgraded the optical transmission system architecture and digital signal processing algorithms, optimized some of the key optoelectronic devices in the system architecture while keeping the S+C+L channel spectrum width 17THz unchanged, and targeted ultra-wide optical domain equalization of the system spectrum to further improve the performance of transmission channels in different bands.

In order to make full use of the transmission capacity of 680 channels in the S+C+L band, the team also uses advanced ultra-high-order probabilistic constellation shaping algorithm, based on PCS-256QAM and PCS-64QAM modulation formats, according to the performance differences of each fiber core, by adjusting the information entropy of the loaded signal to maximize the transmission capacity of each core and each channel.

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