Optical fiber, method for manufacturing optical fiber, and optical fiber preform
AssigneeFujikura Ltd.
InventorHisayuki Nakagome
Life of this patent
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Abstract
An optical fiber includes: a core; and a cladding layer disposed on an outer circumference of the core. A Cl concentration in the cladding layer is 0.029 wt % to 0.098 wt %. In the optical fiber, Δ2−Δ1≤0 dB/km is satisfied at a wavelength of 430 nm where Δ1 is a value of transmission loss before exposure of the optical fiber to hydrogen and Δ2 is a value of transmission loss after the exposure.
Claims7
An optical fiber comprising:
- a core;
- and
- a cladding layer disposed on an outer circumference of the core, wherein a Cl concentration in the cladding layer is 0.029 wt % to 0.098 wt %.
A method for manufacturing an optical fiber including a core and a cladding layer disposed on an outer circumference of the core, the method comprising:
- dehydrating the cladding layer with Cl-containing gas such that a Cl concentration in the cladding layer is 0.029 wt % to 0.098 wt %.
An optical fiber preform for manufacturing an optical fiber including a core and a cladding layer disposed on an outer circumference of the core, wherein
- a Cl concentration in a soot that forms the cladding layer is 0.029 wt % to 0.098 wt %.
Dependencies are inferred from the claim text.