Researchers from Japan’s National Institute of Information and Communication Technology (NICT) set a new world record for long-distance transmission of 319 Tbps over 3,001 kilometers. The team led by Benjamin J. Puttnam successfully completed the first long-distance transmission in the S, C and L bands through a 4-core optical fiber with a standard diameter of 0.125 mm. They say that the use of erbium and thulium fiber amplifiers and distributed Raman amplification make them possible.

The team stated that they have built a transmission system that can make full use of wavelength division multiplexing technology. They combined different amplifier technologies to achieve a transmission demonstration at a data rate of 319 Tbps. With this, they also registered their name in the history book at a speed of 957 beatbits per second x kilometers, which is a world record for standard outer diameter optical fiber.

They said: “NICT and research groups around the world have begun to explore S-band transmission, which has created many new records for optical fiber transmission capacity, but the transmission distance is limited to tens of kilometers.

In the abstract of the paper titled “World Record Demonstration: 319 Tb/s 319 Tb/s 4 Core Fiber Transmission Over 3,001 km”, the researchers stated that in addition to the C-band and L-band that are commonly used for high data rates and languages In long-distance transmission, the team also used the S-band transmission bandwidth, which is still underutilized beyond single-span transmission.

The researchers added that a 4-core fiber with a standard cladding diameter can be connected to existing equipment and hope that it can achieve practical high data rate transmission as soon as possible. They said that this new research will also help realize the backbone communication system, which is essential for the spread of new communication services beyond 5G.

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In addition, the researchers said that they will continue to develop broadband and long-distance transmission systems, and explore how to improve the transmission capacity of low-core multi-core fibers and other new SDM fibers. Not only that, they are also determined to extend the transmission range to transoceanic distances.