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China sets new world record in optical fiber transmission capacity
CGTN
Chinese scientists set world record for single-mode multi-core optical fiber transmission capacity with 4.1 Pbit/s combined transmission over 19-core fiber. /CFP
Chinese scientists set world record for single-mode multi-core optical fiber transmission capacity with 4.1 Pbit/s combined transmission over 19-core fiber. /CFP

Chinese scientists set world record for single-mode multi-core optical fiber transmission capacity with 4.1 Pbit/s combined transmission over 19-core fiber. /CFP

Chinese scientists have broken the world record for single-mode multi-core optical fiber transmission capacity, achieving 4.1 Pbit/s combined transmission over 19-core fiber, the research team announced on Tuesday. 

The State Key Laboratory of Optical Communication Technology and Network under China Information and Communication Technologies Group Corporation (CICT), set a world record in the field last November, achieving 3.03 Pbit/s (wavelength division multiplexed (WDM)/space division multiplexing (SDM) combined transmission over 19-core fiber by using 680 wavelength channels with 25-GHz spacing, covering 17 THz bandwidth of S, C and L-band.

The study was published in the journal of IEEE Photonics Technology Letters.

About six months later, the lab broke its own world record and achieved a total transmission capacity of 4.1 Pbit/s with a net transmission capacity of 3.61 Pbit/s, with an increase of nearly 40 percent over last year's record.

The study published by the journal of IEEE Photonics Technology Letters.
The study published by the journal of IEEE Photonics Technology Letters.

The study published by the journal of IEEE Photonics Technology Letters.

Optimized, upgraded system

To make the new record, Xiao Xi, head of the lab, said that the R&D team optimized and upgraded the optical transmission system architecture and its digital signal processing algorithm.

Keeping the 17 THz bandwidth of S, C and L-band, the team optimized some key optoelectronic devices in the system to equal the spectrum in an ultra-wide optical domain, improving performance of transmission channels in different bands.

In the meanwhile, they adopted an advanced ultra-high-order probabilistic constellation shaping algorithm to make full use of transmission capacity of 680 wavelength channels in the S, C and L-band.

Based on the probabilistically-shaped (PCS)-256 quadrature modulation (QAM) and PCS-64QAM formats, and performance differences of each fiber core, the team maximized transmission capacity of each core and channel through adjusting information entropy of the loading signal.

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