Alcatel-Lucent and BT have succeeded in achieving a transmission speed of 1.4 Tbit/s over an existing fiber optic connection with a length of 410 kilometers. The bandwidth provided a record spectral efficiency of 5.7 bits per second per Hertz, according to the engineers.
The engineers successfully passed the record spectral efficiency test by narrowing the fiber optic channels used so that the data transmission efficiency was 42.5 percent higher than that of an average fiber optic network of this country. moment. Alcatel-Lucent and BT said they used a flexible grid infrastructure they call Flexgrid that allows them to vary the distance between the fiber channels.
Normally, the distance between the channels is 50GHz, but the researchers managed to reduce this to 35GHz. This brought a bandwidth of 1.4Tbit/s within reach by bundling seven channels of 200Gbit/s. BT and Alcatel-Lucent speak of an ‘Alien Super Channel’ because the connection uses alien wavelengths and therefore does not need to be adapted to the existing fiber optic infrastructure. BT believes that this may eliminate the need to install new fiber optic cables to meet the growing demand for bandwidth.