China Telecom releases the world's first single-wavelength 1.2Tbit/s, one-way over 100Tbit/s air-core optical cable transmission system live network demonstration project

News on June 22, on June 20, China Telecom, YOFC, ZTE and Huaxin Design Institute jointly held a meeting on the Next Generation Optical Transport Network Industry and Technical Standards Promotion Committee (CCSATC618) and the Development of New Generation Optical Transport Network At the NGOF "All-Optical Network Technology and Application in the Intelligent Computing Era" seminar, the world's first single-wavelength 1.2Tbit/s, one-way over 100Tbit/s, and 20km transmission distance hollow-core optical fiber cable transmission was released System live network demonstration project. This live network demonstration relies on the "Ultra-Broadband Optical Transmission System and Application Demonstration Based on New Optical Fibers" national key research and development project, and completed the live network of hollow core optical cable between China Telecom Hangzhou Intelligent Computing Center and Hangzhou Telecom Yiqiao IDC Data Center Deployment and bulk transfer. As a key node in the "2+3+7+M+N" layout of China Telecom's intelligent computing power, the Hangzhou Intelligent Computing Center has deployed Tianyi Cloud's kilo-card computing power. Facing the demand for large bandwidth and low latency of optical networks due to distributed deployment of computing power, this project introduced ZTE high-speed optical transmission equipment, combined with spectrum compression, baud rate optimization and amplification optimization technology, and successfully expanded 41 C-bands 1.2Tbit/s wavelength and 64 800Gbit/s wavelengths in the extended L-band, with a one-way capacity of over 100Tbit/s transmission, and the existing network transmission distance is 20km. The current network deploys hollow-core optical fiber cables independently developed by YOFC. Through a combination of multiple solutions, the risk of water intrusion into the optical fiber during the deployment of hollow-core optical cables is effectively avoided. For example, the end of the optical cable uses water-blocking glue and a double-layer plastic cap to isolate the atmosphere and utilize The cable is laid with a rotating head net sleeve to reduce end cap wear, and a barrel-type waterproof joint box is used at the welding point. At the same time, hollow-core fiber splicing technology has achieved breakthroughs, including the application of low-power discharge and gradient amplification bevel cutting optimization technologies, achieving 0.05dB homogeneous splicing loss, 0.25dB single-point heterogeneous splicing loss and -54dB heterogeneous splicing loss. Quality continues to return losses. The relevant person in charge of China Telecom Zhejiang Company said: "By undertaking the national key research and development plan project, we will conduct live network demonstration and verification of hollow core optical fiber combined with 1.2Tbit/s transmission system, and provide detailed engineering data and live network application demonstration. Follow-up, The Zhejiang company will further cooperate with the industry to carry out larger-scale and more content-based research to provide practical scenarios for the interconnection of distributed intelligent computing centers; it will continue to maintain its leading position in the industry in the field of basic transmission network technology innovation.”Check public information. It was learned that Hollow-core fiber (HCF) is based on a new air light guide mechanism, which can guide light through air instead of glass. It can break through the two physical bottlenecks of solid core fiber's capacity limit and delay limit, and can be used in backbone and data centers. It has obvious performance advantages in transmission and is the next generation of optical communication technology. On June 6, China Mobile launched the first 800G hollow-core optical fiber transmission technology test network in Shenzhen-Dongguan, Guangdong, achieving air-to-air fiber splicing loss as low as 0.05dB and air-to-solid on a 20km link. The connection is less than 0.3dB and the cable loss after laying is 0.6dB per kilometer. Related reading: "Hollow core optical fiber, why is it so popular? 》

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