Optical fiber preform having barrier layers for hydroxyl...

Details Optical fiber preform having barrier layers for hydroxyl... Optical fiber preform having barrier layers for hydroxyl...

2006-03-07

2006-03-07

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C428S697000, C428S699000, C428S701000, C428S702000

Reexamination Certificate

active

07008696

ABSTRACT:
Disclosed is an optical-fiber preform having barrier layers to hydroxyl radicals, the optical-fiber preform comprising: a quartz tube in the form of a cylinder shape serving as a substrate for forming the optical-fiber preform; a first barrier layer for preventing hydroxyl radicals from permeating the optical-fiber preform and deposited onto the inner surface of the quartz tube; a second barrier layer having a permeation coefficient higher than the first barrier layer and deposited onto the first barrier layer; a third barrier layer having a permeation coefficient lower than the second barrier layer and deposited onto the second barrier layer; and, a core layer being located at the center of the optical-fiber preform.

REFERENCES:
patent: 6280850 (2001-08-01), Oh et al.
patent: 6530244 (2003-03-01), Oh et al.

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