Article comprising a rare earth or transition metal doped...

Details Article comprising a rare earth or transition metal doped... Article comprising a rare earth or transition metal doped...

G - Physics

02

B

G02B 6/44 (2006.01) H01S 3/067 (2006.01) G02B 6/16 (1995.01)

Patent

CA 2099946

-14- We have discovered that silica-based optical fibers (e.g., 33) that are doped with Ge, Al and a rare earth (e.g., Er) can be very susceptible to hydrogen- induced attenuation change. For instance, such fiber can exhibit loss increase rates that are, at 20°C, 106 times larger than those of a standard single mode fiber. We also believe that transition metal-doped silica-based fibers can exhibit large hydrogen-induced attenuation change. In many circumstances- (e.g., amplifier fiber, attenuator fiber) significant attenuation change of optical fiber is undesirable. We disclose that such change can be substantially eliminated by provision of hydrogen gettering material and/or a "hermetic" fiber coating. It is currently preferred to provide silica cladding material that is a hydrogen getter, and also provide a "hermetic" fiber coating. Containment of the fiber, together with a quantity of a gettering material (e.g., ErFe2) in an essentially hermetic enclosure is also disclosed.

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