Single mode optical fiber, method of manufacturing the same, and apparatus for manufacturing the same
AssigneeFurukawa Electric Co., Ltd.
InventorsHideya Moridaira, Kazuhiko Kurusu, Yoshihiro Inoue
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Abstract
In a single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region, the density of non bridging oxygen hole center in the glass part is not higher than 1.0×1014 spins/g in terms of the spin density measured by an electron spin resonance method.
Claims14
A single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region, wherein density of non bridging oxygen hole centers in said glass part as a value of spin density measured by a electron spin resonance method is not higher than 1.0×1014 spins/g.
A single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region, wherein at least one element selected from the group consisting of Ge and F is added to said glass part, said glass part has an outer diameter of about 125 μm, and the density of the non bridging oxygen hole centers included in a MFD region of said glass part is lower than the density of non bridging oxygen hole center included in said cladding region positioned outside the MFD region.
A single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region, wherein at least one element selected from the group consisting of Ge and F is added to said glass part, said glass part has an outer diameter of about 125 μm, and fictive temperature obtained by a ratio of a defect line denoting a three-membered ring structure of the glass to a defect line denoting a four-membered ring structure, which is obtained by measuring deviation between Rayleigh scattering line and Raman scattering line, is not higher than 1,200° C.
Dependencies are inferred from the claim text.