Article comprising a rare earth or transition metal doped optica

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

1992-08-28

1993-12-28

Healy, Brian

Optical waveguides

Having particular optical characteristic modifying chemical...

Of waveguide core

385123, 385128, 385144, 385141, 359341, G02B 602, G02B 600

Patent

active

052747344

ABSTRACT:
We have discovered that silica-based optical fibers 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.degree. C., 10.sup.6 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., ErFe.sub.2) in an essentially hermetic enclosure is also disclosed.

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