Verfahren zum Herstellen von optischen Fasern aus Vorformen mittels Regulierung des Partialdrucks des Sauerstoffes während der Dehydratisierung der Vorform

摘要

Disclosed are methods (10) for making optical fibers that have reduced aging loss, hydrogen aging and other losses over the life of the fiber, and optical systems including such optical fibers. Fiber manufacturing methods are provided to reduce the likelihood of generating defects in optical fiber preforms that, in optical fiber drawn therefrom, attract and bond with hydrogen atoms to form molecules that increase transmission loss in the fiber. The method steps include feedback control of the oxygen partial pressure during preform dehydration. Optical fiber made by methods according to embodiments of the invention have transmission loss at 1385 nanometers that is less than 0.33dB/km and the change in transmission loss thereafter is less than 0.05dB/km. The feedback control of the said oxygen partial pressure is based on a signal generated by measuring the transmission loss of the drawn fiber having been exposed to.