OPTICAL FIBRE PRODUCING METHOD AND DEVICE AND OPTICAL FIBRE Russian patent published in 2017 - IPC C03B37/25 

FIELD: optics.

SUBSTANCE: invention relates to method and device for optical fibre production and optical fibre, produced using said method and this device. Device is equipped with holder, in which optical fibre workpiece is installed, and heater, arranged outside of holder, for holder heating from outside and ensures optical fibre manufacturing by fibre glass drawing during heating and optical fibre workpiece melting and fibre drawing to outside through outlet hole in holder lower part. Gas supplied to holder, is gas containing 50 % or more of argon or nitrogen, and provided is protective tube with length of Da (mm), located under holder, wherein protective tube has heat-insulating area, covered with heat insulator, with length Db (mm) in its upper part and area, which is not heat-insulating, which is not covered with any heat insulators, in its lower part, and setting parameters are set so, that glass fibre temperature in protective tube outlet hole was equal to 1,700 °C or less and that glass fibre outer diameter in protective tube outlet hole was not exceeding interval of values of glass fibre target external diameter + 6 mqm or less.

EFFECT: technical result consists in producing of optical fibre with small spread along its diameter having losses during transmission, not exceeding specified value, without using special devices for glass fibre slow cooling.

11 cl, 5 dwg