Researchers from Sun Yat-sen University in China have proposed a new technology to increase bandwidth
The proposed system combines spatial,polarization and dense wavelength division multiplexing. The use of three compression methods at once made it possible to transmit data over a 34-kilometer 7-core fiber with an annular middle with a diameter of only 180 microns at a rate of 1.02 Pb / s.
A multiplexing scheme that includes spatial, polarization, and dense multiplexing. Image: Junyi Liu et al., Light: Science and Applications
To transmit data, the researchers usedorbital angular momentum regime. In this case, three groups of nondegenerate regimes of angular momentum were implemented for each nucleus, and four regimes in each group. Each mode was loaded with 312 dense multiplexed wavelengths.
The traditional approach to increaseThe amount of data that can be transmitted over an optical fiber is based on the increase in the number of channels or modes in a single channel. This technology has already made it possible to significantly increase throughput, but its capabilities are limited, the scientists explain.
Diagrams of vortex phase plates for generation7-core modes in the OAM regime with topological charge 2, 3 and 4 (from left to right). Image: Junyi Liu et al., Light: Science and Applications
Using MIMO Spatial Codingbecomes more complex as the number of modes (data transmission modes) and channels grows. Due to inter-channel crosstalk, the complexity increases in a quadratic fashion (number of modes × channels). New technology overcomes these limitations.
Earth-sized sunspot grows 10 times in 2 days: it is directed at us
This is the "twin" of the Earth in the past: a unique planet-ocean was found not far from us
Einstein was right again: after half a century, physicists proved the stability of black holes