SINGLE-MODE OPTICAL FIBER AND METHOD OF PRODUCTION OF SINGLE-MODE OPTICAL FIBER Russian patent published in 2006 - IPC G02B6/36 C03B37/18 

FIELD: optical engineering.

SUBSTANCE: single-mode optical fiber has light-conducting part (4) of core, internal part (3) of envelope which surrounds part 4 of core and area of coating which surrounds the internal part (3) of envelope. Refractivity factor of core part 4 excesses refractivity factors of area 1 and 3 of envelope which are almost equal. Internal part (3) of envelope is made of SiO₂ which includes doping fluoride in amount of 0,1-8,5 mass percent which results to compressing axial force of part 4 of core along its whole cross-section. Internal part 3 of envelope is additionally provided with doping additives to increase refraction and to get refractivity factor being practically equal to refractivity factor of area 1 of coating. Tube base is made of silicon dioxide and the base functions as area of coating. Internal part of envelope and area of core are formed by means of one or several reaction-capable gases. After they are formed the tube of base is subject to shrinkage and elongation to single-mode optical fiber. Single-mode optical fiber produced has low hydrogen-induced attenuation at 1500 nm wavelength.

EFFECT: lower hydrogen-induced attenuation.

15 cl, 8 dwg