US Laboratory has solved the problem of signal distortion in 13000KM fiber optic transmission

According to China Defense Science and Technology Information Network Report, the U.S bell labs researchers have developed a method that can significantly reduce the long distance optical transmission signal distortion problem. The research result have been published in “Nature Photonics” magazine, indicate it can make the fiber optic cable to transmit more digital signal traffic in the long distance.

Compared with the copper wires, fiber optical cable transfer signals faster because it uses light as the medium, unlike the electricity, the resistance is less, which makes fiber optic cable transmit more digital signals, however, the price is higher. As the result of using light as the transmission medium, the signal is more subject to the distortion effects, so optical amplifier and signal corrector are needed for long-distance transmission, such as the submarine transmission cable between Australia and Asia. This study can solve the distortion problem in up to 13,000km, rate up to 400G/S signal transmission, which has been for a long time considered to be unattainable.

The researchers took a new and ingenious ways to solve the problem of signal interference, which can transmit mutually compensable dual signals in the fiber optic cable, when one signal is interfered, the other would not been affected, in the receiving end, the two signals overlay and compensated for the missing data. By this way, the distortion will be reduced at least 8.5Db. Reducing the distortion in optical distance between two points may not lead to faster communication, but the optical flow has been increased. New method does not require fiber optic amplifiers and signals corrector, dramatically reducing the cable laying and maintenance costs, especially for submarine implement, which is particular important for the geographical isolation countries such as Australia.