Optical waveguides – Having particular optical characteristic modifying chemical... – Of waveguide core
Reexamination Certificate
2007-07-05
2011-11-08
Peng, Charlie (Department: 2883)
Optical waveguides
Having particular optical characteristic modifying chemical...
Of waveguide core
Reexamination Certificate
active
08055115
ABSTRACT:
An optically active glass and an optical fiber comprising such glass, having reduced photodarkening properties are provided. The optically active glass is mainly composed of silica representing from about 50 to 98 mol % of the glass. It also includes at least one active ion, such as a rear-earth ion, which induces a photodarkening effect in optical properties of the glass. Moreover, the glass includes an effective amount of phosphorus oxide providing the photodarkening reducing effect, preferably in an amount of from about 1 to 30 mol %. A method for reducing a photodarkening effect in optical properties of an optically active glass including the step of introducing phosphorus oxide to the glass is also provided.
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De Sandro Jean-Philippe
Gagnon Eric
Morasse Bertrand
Coractive High-Tech Inc.
Merchant & Gould P.C.
Peng Charlie
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