Researchers at Japan’s National Institute of Information and Communication Technology (NICT) have successfully completed the first long-distance S, C and L transmission on a four-core optical fiber with a standard outer diameter (0.125 mm). The researchers, led by Benjamin J. Puttnam, have designed a transmission system that takes full advantage of wavelength division multiplexing technology by combining various amplifier technologies to demonstrate transmission at 319 Tbit / s over a distance of 3001 km. Using a common metric for comparing optical fiber transmission, the data rate and distance indicated is 957 Pbps / km, a world record for standard outer diameter optical fibers.
Transmission over a distance of 3,001 km was made possible by the use of doped fiber amplifiers with erbium and thulium and distributed Raman amplification. The achievement demonstrates the potential of SDM fiber optic cables with standard sheath diameter and compatibility with existing cable technologies, the researchers said.