2.5Pb/s, my country’s optical communication real-time transmission speed sets a new world record

Recently, the National Key Laboratory of Optical Communications Technology and Networks of China Information Technology Group, in conjunction with Pengcheng Laboratory and FiberHome Fujikura Optical Fiber Technology Co., Ltd., successfully achieved ultra-large capacity real-time optical transmission of 2.5Pb/s 24-core optical fiber, setting a new world record for optical communications.

It is understood that the data transfer rate of 2.5Pb/s is equivalent to downloading more than 14,000 20GB 4K high-definition movies in one second; even massive data for AI large model training can be interacted with instantly.

Image source: National Key Laboratory of Optical Communications Technology and Networks

This technological breakthrough has three major highlights:

Achieving record-breaking Pb/s-level real-time two-way transmission capabilities. In 10.3 kilometers of 24-core single-mode optical fiber, 2.5Pb/s real-time two-way transmission covering the S+C+L three-bands is completed, with a total spectral bandwidth of 19.65 terahertz (THz). Through joint multiplexing of 262 wavelength channels and 24 fiber core channels, 6288 parallel transmission channels were constructed, verifying the technical feasibility of ultra-large-scale space-wavelength joint expansion.

Create highly implementable commercial technology solutions. The system uses self-developed commercial S+C+L band integrated 400G coherent optical modules and completes real-time transmission based on 64GBaudPDM-16QAM, which greatly improves the engineering realization of full-band optical transmission and provides a reference technical path for future actual network deployment.

Innovative multi-core optical fiber bidirectional transmission architecture. By optimizing the distribution mechanism between cores, crosstalk between cores is effectively suppressed, allowing the 24-core optical fiber to achieve stable operation without complex MIMO (Multiple Input Multiple Output) equalization processing, significantly reducing system complexity and deployment costs.

The National Key Laboratory of Optical Communication Technology and Networks stated that this research is based on a self-developed commercial integrated S+C+L band 400G coherent optical module and 24-core single-mode optical fiber. It successfully achieved 2.5Pb/s real-time bidirectional transmission covering the S+C+L three-band bands, verifying the feasibility and engineering potential of space division multiplexing and multi-band integration in ultra-large-capacity optical communications. Experimental results show that without complex MIMO processing, high-capacity, low-complexity stable transmission can be achieved through reasonable system architecture design and resource allocation, providing a new implementation path for the next generation of optical communication systems.

In the future, with the continued development of multi-core optical fiber preparation technology, broadband optical amplifiers and multi-band optical devices, converged transmission technology based on space division multiplexing and extended band is expected to further improve system capacity and transmission efficiency. This technical solution has good application prospects in application scenarios such as data center interconnection, backbone network transmission, and ultra-high-speed optical networks. At the same time, the combination of higher-integrated optical modules and intelligent signal processing methods is expected to promote the continuous evolution of optical communication systems toward higher capacity, lower cost, and stronger engineering realizability.

Data show that the National Key Laboratory of Optical Communication Technology and Networks (formerly the State Key Laboratory of Optical Fiber Communication Technology and Networks) is one of the first batch of corporate national key laboratories prepared by the Ministry of Science and Technology in 2007. The laboratory faces the forefront of scientific and technological development in the world of information and communications and the major national strategic needs for network information security. It conducts technical research on optical communication systems, optical fiber cables, and optical communication devices and has achieved a number of results. (Source: National Key Laboratory of Optical Communications Technology and Networks, compiled by TrendForce Optical Communications)

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