NTT has developed the digital coherent digital disposal circuit and the optical device which achieve the optical transmission of 1.2 Tbps per wave. This is the world’s largest capacity.

By using the device of original development, they accelerate the modulation rate of optical signal to 140-giga unit pulse and achieve 1.2 Tbps per wave. Moreover, it is also possible to expand the optical-transmission distance of 800Gbps more than double.

The power dissipation per bits is likely for the transmission capacity to be expanded by 12 times by this outcome, and to be reduced to 1/10.

NTT aims at the implementation of all photonics network in IOWN using this outcome. Communication traffic continues to increase.

In order to correspond to this situation, in the optical communications networking, reducing the power dissipation which is necessary for the transmit per unit bits, and cost at 1/10 pace by a years for ten years is called for.