Chinese scientists announced on May 9 that they had broken the world record for single-mode multi-core optical fiber data transmission capacity, reaching 4.1 Pbit/s with a 19-core optical cable.
The research team set a record with a 19-core fiber optic cable. Photo: CFP
The National Key Laboratory of Optical Network and Communication Technology of the China Information and Communications Technology Corporation (CICT) previously set a world record of 3.03 Pbit/s in November last year. They used the optical wavelength division multiplexing (WDM)/space division multiplexing (SDM) method combined with transmission over 19-core fiber, using 680 wavelength channels with a spacing of 25 GHz and a bandwidth of 17 THz. The research results were then published in IEEE Photonics Technology Letters.
About six months later, the lab broke its own record and achieved a total transmission capacity of 4.1 Pbit/s, an increase of nearly 40% over last year's record. To create the new record, Xiao Xi, head of the lab, said that the research and development team optimized and upgraded the optical power system structure and digital signal processing algorithm.
Maintaining a bandwidth of 17 THz across the S, C, and L bands, the team optimized several electro-optical devices in the system for ultra-wideband optical spectra, improving channel performance across different bands. At the same time, they also applied advanced algorithms to maximize the transmission power of 680 wavelength channels across the S, C, and L bands. The researchers then maximized the transmission power of each core and channel by adjusting the information entropy (a measure of the degree of disorder in a signal derived from a random event) of the signal.
An Khang (According to CGTN )
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