OPTICAL FIBRE AND OPTICAL TRANSMISSION SYSTEM Russian patent published in 2017 - IPC G02B6/02 

FIELD: optics.

SUBSTANCE: invention relates to optical fibres. Optical fibre with low attenuation is proposed, which is made with possibility to use as optical transmission line in optical access network, it is glass optical fibre, based on quartz, and includes core, comprising central axis, optical cladding, surrounding core, and protective cover surrounding optical cladding. Core contains GeO₂ and has relative difference of index of refraction Δcore, based on optical cladding, greater or equal to 0.35 % or less or equal to 0.50 %, and has volume v of index of refraction greater or equal to 0.045 µm² and less or equal to 0.095 µm². Protective cover has relative difference of index of refraction ΔJ, greater or equal to 0.03 % and less or equal to 0.20 %. Core glass has fictitious temperature greater or equal to 1,400 °C and less or equal to 1,590 °C. Residual tension in core is compression stress with absolute value greater or equal to 5 MPa.

EFFECT: technical result is reduction of losses in optical fibre, when used as optical transmission line in optical access network.

22 cl, 6 dwg