Auteur Sujet: Recherche sur coeur Fibre  (Lu 2606 fois)

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Recherche sur coeur Fibre
« le: 04 novembre 2019 à 09:22:51 »
Le coeur de fibre viendrait à changer :

 (Nov. 4, 2019)
A new type of fiber is getting closer. The Southampton University Optoelectronic Research Center (ORC), based at the Zepler Institute of Photonics and Nanoelectronics (UK), announced a breakthrough in the design of optical fibers in the Hollow-Core Fiber (HCF) technology. Hollow-core fibers are optical fibers in which the conventional glass core is replaced by a gas or vacuum. For decades, such fibers have been of interest to scientists and engineers around the world because of their special properties, including the ability to achieve higher speeds of light propagation and thus shorter transmission delays, to compare them with the traditional fiber optics with the glass core. Based on theoretical models, HCF fibers should also feature lower attenuation, which would mean the possibility of signal transmission over much greater distances without the need for signal regeneration.

HCF fibers may differ in structure. The common feature is always the "hollow" core, but the cladding structures are different, most often in the form of glass capillaries. In the drawing from the left: lattice/mesh structure (so-called "Kagome" fiber), "revolver" type fiber, and cone-type fiber.
A kind of the HCF fiber, NANF fiber (Nested Antiresonant Nodeless Fiber), was presented during the 45th European Conference on Optical Communication (ECOC 2019) in Dublin at the beginning of October. The test results showed a record-low attenuation for this type of fiber, 0.65 dB/km in the whole C and L telecommunication bands. The data transmission speed test had been carried out at so far the longest distance of 340 km.
These results still diverge from the possibilities of glass fiber optics used today, however, engineers dealing with this subject agree that the attenuation below the psychological barrier of 1 dB/km and the demonstration that signal transmission in HCF fibers over a long distance is not accompanied by any significant fundamental restrictions makes the vision of achieving next levels much closer. The nearest plans include designing NANF fibers with attenuation similar to that of glass fibers. Given that it is only the second year of intensive work on this project, one can expect that these plans will be implemented quickly.