Russian scientists have developed a fiber-optic system of high-speed data transmission of more than 520 km that does not require repetition of the signal on the way.
Countries with small-scale areas or consisting of many islands are faced with difficulties in providing communication services. This is due to the fact that without intermediate repeaters the signal weakens and does not reach the destination. To solve the problem, fiber optic systems that enhance the signal were previously developed without additional power sources on the line. The best existing technologies are capable of transmitting data to 100 Gbit / s per distance of up to 500 km.
Researchers from the Moscow Institute of Physics and Technology, together with engineers from the American Corning and Russian T8, developed the Volga system, with which a signal was successfully transferred at a speed of 200 Gb / c more than 520 km. Previously, such results were achieved only in laboratories, but this time the tests were used using commercial fiber optic cables.
To save the signal, it first was reinforced during transmission, and then twice in the path using the effect of forced combination scattering and remote amplifiers with optical pumping.
The line consisted of two types of connected sequential fiber optic cables that were divided into 3 sections. Remote erbium optical pumping amplifiers were installed in sections connecting places. Consuming the optical pumping energy, they used it to enhance the signal. To improve the quality of the output signal, the command optimized the connection location, placing two amplifiers at a distance of 122 km from the transmitter and 130 km from the receiver, respectively.
At a signal frequency of 57 billion pulses per second, the system allows you to transmit five bits to the symbol, providing a total speed of 284 Gb / s. Although the system potentially supports data transmission at a speed of up to 400 Gbit / s, the engineers reduced it to increase the distance.
The next goal of the team is to upgrade the new system and reaching the transfer rate of 600 Gb / s per channel.
Scientists also improve wireless communication systems. Earlier we reported on the development of the first prototype of the ultra-speed
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