NTT and others develop the world's highest density optical fiber, and the transmission capacity is 100 times higher than that of the original optical fiber

On May 16, NTT, Fujikura and Hokkaido University announced that they have developed the world's highest density optical fiber, achieving a fine diameter
of 250 microns or less.
Six optical simultaneous Fibre Channels are configured with 19 and 114 information paths
on 1 wire.
As the demand for data communication increases, multiple cores will be deployed in one optical fiber, and this research and development will break the transmission capacity of optical fiber core wires and expand globally
.
However, considering the upper limit of the diameter of the fiber that can actually be used and the control of the distribution of core curvature, it is difficult for not only the number of cores to increase, but also the number of modules.

Against this backdrop, NTT, Fujikura, and Peking University are promoting the development of one optical fiber that can be practically used through the optimal combination of multiple cores and multiple modules, and research and development
of multiple possible optical fibers through more than 100 tunnels.

NTT will contribute to the bending of 15-30 mm radius with an optical fiber diameter of less than 250 microns, even if the existing terrestrial optical fiber transmission lines are equal, and this time it will be tested again to confirm
this experience.

NTT and Peking University have multiplied tunnels of more than 100 for fiber diameters below 250 microns, and optimized the bending distribution rate of cores that can be transported by three or six modules, and explored various core configurations
that can be adequately controlled by the interference of fiber optic signals using the most suitable core.
As a result, 6 modules can guide the core of the wave in 19 honeycombs, and the world's largest 114 channels can be multiplexed
on a fiber diameter of less than 25 microns.

For this design guide, Fujikura produced an optical fiber that is about 8.
85 kilometers long, and NTT evaluated
this performance.
The transmission loss on the 114-channel wavelength of 1550nm is less than 0.
24db/km, and so far, the six modules in the report have been used to achieve the lowest transmission loss
in multicore fiber.
In addition, the transmission loss deviation between each channel is less than 0.
03dB/km, which can achieve a very average high-density optical fiber
.
In addition, it is important to transmit optical fibers that are used simultaneously by multiple modules, and the transmission speed difference between modules is less than 0.
33ns/km, and the speed difference
has been achieved among multicore fibers using 6 modules reported so far.
The bending distribution of these 19 cores enables high-precision control
.

NTT produces optical fibers with 114 channels, which can confirm whether ultra-large capacity transmission is realized, and the latest QAM digital coherent transmission technology merges optical fiber signals that differ from 114 tunnels through the incident end, and the optical fiber type Fan-In· Fan-out device to evaluate the transmission quality
of each tunnel.
As a result, all signals in tunnel 114 exceed the transmission limit, and large-capacity transmission is possible
.

Through this research, NTT and other companies will be able to open roads with an increase in data traffic in the future, and the multi-Petabit can meet the 1,000-fold Exa bit of optical fiber with high reliability
.
The optical fiber developed this time will be put into practical use in 2020, and it is expected to continue to meet the optical fiber transmission foundation
in terms of the increasing demand for data communication.