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An optical fiber formed from a glass preform substantially free of OH impurities is disclosed. The optical fiber is made to be free of OH impurities by a method having the steps of introducing a moving stream of vapor mixture including at least one compound glass-forming precursor together with an o

An optical fiber formed from a glass preform substantially free of OH impurities is disclosed. The optical fiber is made to be free of OH impurities by a method having the steps of introducing a moving stream of vapor mixture including at least one compound glass-forming precursor together with an oxidizing medium into a tube, while generating a hydrogen-fee isothermal plasma on an outer surface of the tube to react the mixture and produce a glassy deposit on an inner surface of the tube. The glass preform is drawn to produce the optical fiber.

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An optical fiber substantially free of OH impurities, capable of transmitting an optical signal without loss due to sub-harmonic interference by OH absorption, wherein said optical fiber is drawn from a glass preform produced according to the following modified chemical vapor deposition method: intr

An optical fiber substantially free of OH impurities, capable of transmitting an optical signal without loss due to sub-harmonic interference by OH absorption, wherein said optical fiber is drawn from a glass preform produced according to the following modified chemical vapor deposition method: introducing a moving stream of vapor mixture including at least one glass-forming precursor and an oxidizing medium into a tube; and heating the tube with a substantially hydrogen-free heat source, whereby the mixture reacts and a glassy deposit is produced on an inner surface of the tube.