SINGLE-MODE OPTICAL FIBRE WITH ULTRA-LOW ATTENUATION AND LARGE EFFECTIVE AREA Russian patent published in 2022 - IPC G02B6/36 G02B6/02 

FIELD: optics.

SUBSTANCE: single-mode optical fibre with ultra-low attenuation and large effective area comprises core layer (1), first, second, third and fourth cladding layers (5). First layer (2) of the shell is fluorine-doped quartz; second, third and fourth layers (5) of the shell are quartz. Third layer (4) of the shell comprises at least one annular microporous layer, which contains a plurality of evenly distributed micropores (40), wherein the centres of the circle of micropores (40) in each annular microporous layer are concicular, and the circles are concentric with layer (1) of the core. Core layer (1) is quartz doped with alkali metal, containing inner core layer (10) and core transition layer (11). Single-mode optical fibre has ultra-low attenuation and a large effective area and can realize fibre-optic transmission over a large-mode field and reduce the nonlinear effect of high-throughput transmission.

EFFECT: providing ultra-low attenuation characteristics and a large effective area and realizing fibre-optic transmission over a large-mode field and reducing the nonlinear effect of high-throughput transmission.

13 cl, 2 dwg, 2 tbl