At the "2022 China Optical Network Symposium" held today, Wei Leping, executive deputy director of the Communications Technology Committee of the Ministry of Industry and Information Technology, director of the Technology Committee of China Telecom Group Corporation, and chairman of the China Optical Network Symposium, said that the 400G era has opened. Data centers (DCs) are the first to open the transition to 400G, and 400G has opened applications in 2019 and will become dominant in 2023.
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The transformation of the digital economy, bringing a large number of new services, new applications, new technologies and new models, has put forward new requirements for the architecture, capacity, rate, performance and availability of the underlying network, and the 400G era has opened.
According to Leping Wei, public telecom networks have also opened the transition to 400G at the network edge - traffic-driven, 400G is the main growth point of optical modules in the next five years, with a compound growth rate of 44%; standards-driven, OIF's 4000ZR, Open ZR+ and OpenRoadm MSA's 400 ZR+; technology-driven, silicon, silicon optical and DSP advances have given rise to universal optical modules - digital coherent pluggable optical modules, breakthrough size, cost, functional barriers, applicable to multiple systems, multiple topologies, multiple scenarios; rate driven, CTC regional / long-distance network capacity of multiple paragraphs exceeds 30T, up to 110T, with single-wave 400G WDM instead of single-wave 100G WDM can save a lot of expensive transponder and fiber.
For the progress of oDSP, the key technology of super 400G, Wei Le Ping revealed that the current generation of commercial oDSP with 7nm, 96GB baud rate, 64QAM modulation code type has been able to support 800G rate short distance transmission; the new generation of oDSP with 5nm, 130GB baud rate, QPSK modulation code type can support 400G rate 1500 km long distance transmission; the three keys of oDSP algorithm are The three keys of oDSP algorithm are probabilistic shaping (PS), high-performance forward error correction (CFEC, OFEC), and digital subcarrier modulation (DSCM); PS is expected to improve optical signal-to-noise ratio by about 2dB, and high-performance FEC can obtain up to about 12dB of net coding gain through cascaded coding and soft judgment combined with multiple iterations of decoding. DSCM not only enhances the tolerance of high baud rate signals to dispersion and filtering, but also enhances the tolerance of nonlinearity.
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