NEC and NTT technology will provide a signal speed of hundreds of terabits.
Japanese companies NEC and NTT have successfully tested a new multi-core fiber-optic cable technology for laying on the ocean floor. The development will expand the capacity of underwater Internet channels connecting continents to cope with the ever-growing volume of international Internet traffic.
During the experiment, the speed of traffic transmission reached hundreds of terabits per second at a record distance for such technologies — 7280 km. This success was achieved thanks to the use of a special signal processing algorithm.
The most important solution is a 12-wire multi-core optical cable that accommodates many independent channels inside a single fiber of standard diameter. This is a fundamental difference from traditional single-core underwater lines.
However, an increase in the number of cores in one fiber creates a problem of mutual interference — leakage of signals from one core to neighboring ones, which worsens the quality of communication. This effect is amplified over long distances due to differences in the characteristics of individual veins.
To combat the problem, NEC created an algorithm that uses MIMO technology to accurately separate mixed signals during demodulation. At the same time, NTT developed a special 12-core cable that minimizes differences in the characteristics of individual cores.
The companies plan to bring the technology to the market and apply it both for the construction of new high-speed underwater highways and in land-based networks.
Japanese companies NEC and NTT have successfully tested a new multi-core fiber-optic cable technology for laying on the ocean floor. The development will expand the capacity of underwater Internet channels connecting continents to cope with the ever-growing volume of international Internet traffic.
During the experiment, the speed of traffic transmission reached hundreds of terabits per second at a record distance for such technologies — 7280 km. This success was achieved thanks to the use of a special signal processing algorithm.
The most important solution is a 12-wire multi-core optical cable that accommodates many independent channels inside a single fiber of standard diameter. This is a fundamental difference from traditional single-core underwater lines.
However, an increase in the number of cores in one fiber creates a problem of mutual interference — leakage of signals from one core to neighboring ones, which worsens the quality of communication. This effect is amplified over long distances due to differences in the characteristics of individual veins.
To combat the problem, NEC created an algorithm that uses MIMO technology to accurately separate mixed signals during demodulation. At the same time, NTT developed a special 12-core cable that minimizes differences in the characteristics of individual cores.
The companies plan to bring the technology to the market and apply it both for the construction of new high-speed underwater highways and in land-based networks.
