Patent ID: 6884474

Claim:
A method of coating an oblong polymer fiber, which is provided for guiding light in the form of optical signals, said method comprising: applying around the fiber a coating made of polymer material having a lower index of refraction than the fiber, wherein said applying step further comprises: coating the fiber in a coating facility having at least one chamber, to which a halogenated gas and/or gas mixture is supplied, and a ring-shaped nozzle, through which the fiber is moved, converting the halogenated gas and/or gas mixture into a plasma in the chamber under the effect of microwaves and removing the plasma from the chamber through the nozzle, and moving the fiber at least one time over its entire length through the ring-shaped nozzle of the coating facility thereby providing the fiber with a coating made of a halogenated polymer which is generated by the incidence of the plasma in order to achieve a variable coating thickness around the fiber.