Method and furnace for drawing an optical fibre from a preform

摘要

A furnace is provided. The furnace includes a chamber for heating a portion of a preform to draw a fiber. The chamber has a melt region for melting the preform, and at least one port disposed proximate to the melt region. A purge gas supply is provided for supplying a purge gas into the chamber. The purge gas moves vapor products away from the fiber and exits the chamber through the at least one port.