Recently, the China Telecom Research Institute, in collaboration with ZTE Corporation and Yangtze Optical Fibre and Cable Joint Stock Limited Company (hereinafter referred to as "YOFC", stock codes 601869.SH, 06869.HK), achieved a new world record for real-time transmission rate on standard single-mode quartz fiber. The experiment conducted across S+C+L multiple bands reached a peak real-time single-wave rate of 1.2 Tbit/s, with a single fiber's unidirectional transmission rate exceeding 120 Tbit/s. This feat is equivalent to transmitting several hundred 4K ultra-high-definition movies or multiple AI model training datasets per second.
This verification test of over 120 Tbit/s on a single fiber has made breakthrough achievements in system spectral width, key algorithms, and architectural design.
System Spectral Width Building upon the traditional C band, the system's spectral width was further expanded to include the S and L bands, achieving an ultra-wide communication bandwidth of up to 17 THz, covering a wavelength range from 1483nm to 1627nm.
Key Algorithms The China Telecom Research Institute, considering the loss and power transfer characteristics of the S/C/L bands, proposed a solution to maximize spectral efficiency through adaptive matching of symbol rates, channel spacing, and modulation formats. Additionally, leveraging ZTE's multi-band system filler waves and automatic power balancing technology, the performance of channel-level services was balanced, optimizing transmission distance.
Architectural Design The real-time transmission utilized advanced optoelectronic packaging technology, with single-wave signal baud rates exceeding 130 GBd and bit rates reaching 1.2 Tbit/s, significantly reducing the number of optoelectronic components required.
The experiment employed YOFC's ultra-low-loss, large-effective-area fiber, characterized by lower attenuation coefficients and larger effective areas, aiding in extending the system's spectral width to the S band, with the highest real-time single-wave rate reaching 1.2 Tbit/s. This fiber has achieved domestication in design, preparation, process, and raw materials.
With the rapid development of artificial intelligence technology and its business applications, there has been an explosive growth in bandwidth demand for data center interconnects. As the bandwidth cornerstone of digital information infrastructure, all-optical networks need to further break through the rate and capacity of optical transmission. Upholding the mission of "Smart Connection, Better Life," YOFC will join hands with operator customers to focus on the core key technology research and development of optical communication. They will explore deep cooperation and commercial implementation in new rates, new bands, and new fibers. Through technological innovation, YOFC aims to build new productive forces for enterprises, continuously drive the sustainable development of all-optical networks, and help construct a solid foundation for the digital future.
