Optical fiber
US-9575245-B2 · Feb 21, 2017 · US
Optical fiber
US10031282B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10031282-B2 |
| Application number | US-201715700493-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 11, 2017 |
| Priority date | Feb 26, 2016 |
| Publication date | Jul 24, 2018 |
| Grant date | Jul 24, 2018 |
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- Title
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Abstract
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An optical fiber containing alkali metal elements or the like in which Rayleigh scattering loss can be reduced is provided. An optical fiber includes a core composed of silica glass and a cladding which surrounds the core, has a refractive index lower than a refractive index of the core, and is composed of silica glass containing fluorine. The core contains a first group of dopants and a second group of dopants having a diffusion coefficient lower than a diffusion coefficient of the first group of dopants. The difference between the maximum value and the minimum value of residual stress in the optical fiber is 150 MPa or less.
First claim
Opening claim text (preview).
The invention claimed is: 1. An optical fiber comprising: a core composed of silica glass which contains a first group of dopants consisting of alkali metal elements or alkaline earth metal elements and having a diffusion coefficient of 1×10 −12 cm 2 /s or more in silica glass at a temperature of 2,000° C. to 2,300° C. and a second group of dopants consisting of alkali metal elements or alkaline earth metal elements and having a diffusion coefficient that is lower than the diffusion coefficient of the first group of dopants in silica glass; and a cladding which surrounds the core, has a refractive index lower than a refractive index of the core, and is composed of silica glass containing fluorine, wherein the difference between the maximum value and the minimum value of residual stress in the optical fiber is 150 MPa or less, wherein the ratio C2/C1 is 5 or more, where C1 is the average concentration of the first group of dopants in the core, and the C2 is the average concentration of the second group of dopants in the core. 2. The optical fiber according to claim 1 , wherein the ratio C2/C1 is 30 or less. 3. The optical fiber according to claim 1 , wherein the C1 is 1 to 20 wtppm, and the C2 is 20 to 300 wtppm. 4. The optical fiber according to claim 1 , wherein the core contains Na or K as the first group of dopants and contains any one of Rb, Cs, Mg, Ca, and Sr as the second group of dopants.
Assignees
Inventors
Classifications
containing alkali metals · CPC title
in the gaseous phase · CPC title
by collapsing without drawing · CPC title
- G02B6/02Primary
Optical fibres with cladding {with or without a coating} · CPC title
containing beryllium, magnesium or alkaline earth metals · CPC title
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- What does patent US10031282B2 cover?
- An optical fiber containing alkali metal elements or the like in which Rayleigh scattering loss can be reduced is provided. An optical fiber includes a core composed of silica glass and a cladding which surrounds the core, has a refractive index lower than a refractive index of the core, and is composed of silica glass containing fluorine. The core contains a first group of dopants and a second…
- Who is the assignee on this patent?
- Sumitomo Electric Industries
- What technology area does this patent fall under?
- Primary CPC classification G02B6/02. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jul 24 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).