Single mode optical transmission fiber, and method of making the fiber
AssigneeLucent Technologies Inc.
InventorsDavid J. DiGiovanni, Kenneth L. Walker
Life of this patent
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Abstract
We have discovered that hydrogen-related loss in silica-based single mode transmission optical fiber can be reduced or eliminated by use of a substrate tube that contains hydrogen getter sites. Exemplarily, substrate tubes according to the invention are doped with Ge or P.
Claims8
Single mode optical transmission fiber comprising a core of diameter d, a deposited cladding of diameter D contactingly surrounding the core, and a tube-derived cladding contactingly surrounding the deposited cladding,
- CHARACTERIZED IN THAT
- the tube-derived cladding contains hydrogen getter sites selected to substantially prevent migration of hydrogen into the deposited cladding during manufacture of the fiber, and D and d are selected such D/d <2.5.
Method of making silica-based optical transmission fiber comprising a core of diameter d, a deposited cladding of outer diameter D contactingly surrounding the core, and a tube-derived cladding contactingly surrounding the deposited cladding, the method comprising making a preform and drawing the fiber from the preform, the preform comprising tube-derived as well as deposited silica-based material;
- CHARACTERIZED IN THAT
- making the preform comprises providing a silica-based substrate tube that contains a concentration of hydrogen getter sites sufficient to substantially prevent migration of hydrogen into the deposited silica-based material during making of the preform and drawing of the fiber, and further comprises selecting the deposited silica-based material such that the optical transmission fiber has D/d <2.5.
Dependencies are inferred from the claim text.