Succeeded in high-speed large-capacity transmission experiment of 1 petabit per second with 12 core optical fiber


In March 2011We successfully transmitted 109 Tbps (terabit per second) with optical fiberThere was a news that I was ten times, transmission experiment of 1Pbps (petabit per second) succeeded. The transmission distance is over 50 km, which corresponds to the speed at which 5000 high-definition movies of 2 hours can be transmitted in 1 second.

NTT HOME> NTT holding company news release> 1 petabit per second, 50 km world's largest capacity optical transmission successful

NTT,Fujikura, Hokkaido University, Denmark Technical University (DTU) succeeded in transmitting 52.4 km of large capacity data of 1 petabit per second using a 12 core optical fiber.

Recent increase in communication traffic is mentioned as a background of research. Up to now, we have supported services by increasing the capacity of optical communication system equipment without changing the basic structure of optical fiber, but considering the current rate of increase, long-term response to future traffic is a challenge It was getting.

Under such circumstances, Professor Toshio Morioka of DTU is researching and developing a spatial multiplexing optical communication technology using a new spatially structured optical fiber including multicore optical fiber etc. having multiple cores in one optical fiber Advocate. In order to confirm the effectiveness of this proposal, NTT, Fujikura, Hokkaido University, DTU have been conducting research.

In this experiment, we developed a 12 core - multiple optical fiber and a new input / output device with a new structure in which the cores are arranged almost concentrically. To each core, we applied digital coherent optical transmission technology capable of high-density wavelength multiplexing, and reduced the leakage (crosstalk) of optical signals between the cores which was a problem until now.

The conventional multi-core optical fiber has a hexagonal close-packed structure (7 cores, 19 cores). This time 12 cores of non-hexagonal close-packed structure, concentric arrangement reduces the number of adjacent cores, crosstalk is reduced.

Also, an intensity modulation technique that sends 0 and 1 of a signal in correspondence with two intensity states, usually ON and OFF, is common, but it is possible to utilize the phase and polarization, which is the property of the wave of light, By using polarization multiplexing 32-value QAM digital coherent technology that enables transmission, the transmission efficiency per core has been doubled more than four times as compared with conventional multi-core optical fiber transmission.

As a result, it achieves 84.5 terabit transmission capacity per core (380 Gbps capacity × 222 wavelength channel per wavelength). We demonstrated that a single 12-core multi-optical fiber can transmit a signal of 84.5 terabits × 12 signals of 1.01 petabit per second over 52.4 km. It updates the conventional world record of 305 terabits per second (transmission distance 10 km).

The single core optical fiber has a transmission distance of over 100 km, but the transmission capacity was small. The goal is to further extend the transmission distance and transmission capacity in the future.

Through this experiment, key elemental technologies to realize an innovative optical communication system which raises the commercial technology of optical fiber which is currently in practical use to more than 1000 times have been developed.

in Science, Posted by logc_nt