Optical fiber
US-2019324195-A1 · Oct 24, 2019 · US
Optical fiber
US10656326B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10656326-B2 |
| Application number | US-201916512534-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 16, 2019 |
| Priority date | Jul 17, 2018 |
| Publication date | May 19, 2020 |
| Grant date | May 19, 2020 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
An optical fiber in which the increase of attenuation can be reduced is offered. An optical fiber is made of silica glass and includes a core and a cladding enclosing the core. The refractive index of the cladding is smaller than that of the core. The core includes chlorine and any of the alkali metal group. The chlorine concentration is 1 ppm or more in the whole region of the core. In the whole region of the core, the absolute value of rate of radial change of the chlorine concentration is smaller than 2000 ppm/μm.
First claim
Opening claim text (preview).
What is claimed is: 1. An optical fiber made of silica glass and containing a core and a cladding, the cladding enclosing the core and having a refractive index smaller than the refractive index of the core, the core containing chlorine as well as an alkali metal or an alkaline-earth-metal element, the core having a chlorine concentration of 1 ppm or more in the whole region thereof, and the absolute value of rate of radial change in the chlorine concentration being smaller than 2000 ppm/μm. 2. An optical fiber as set forth in claim 1 , wherein the absolute value of the rate of radial change in the chlorine concentration of the whole region of the core is less than 1000 ppm/μm. 3. An optical fiber as set forth in claim 1 , wherein the absolute value of the rate of radial change in the chlorine concentration of the whole region of the core is less than 500 ppm/μm. 4. An optical fiber as set forth in claim 1 , wherein the absolute value of the rate of radial change in the chlorine concentration of the whole region of the core is less than 300 ppm/μm. 5. An optical fiber as set forth in claim 1 , wherein the absolute value of the rate of radial change in the chlorine concentration of the whole region of the core is more than 100 ppm/μm. 6. An optical fiber as set forth in claim 1 , wherein the absolute value of the rate of radial change in the chlorine concentration of the whole region of the core is more than 200 ppm/μm. 7. An optical fiber as set forth in claim 1 , wherein the core contains fluorine. 8. An optical fiber as set forth in claim 7 , wherein the average fluorine concentration in the core is 500 to 4000 ppm. 9. An optical fiber as set forth in claim 1 , wherein the average value of the concentration of alkali metal or alkaline-earth-metal element in the core is 0.2 to 200 ppm. 10. An optical fiber as set forth in claim 1 , wherein the core contains, for alkali metal or alkaline-earth-metal element, one or more elements selected from a group consisting of sodium, potassium, rubidium, cesium, and calcium.
Assignees
Inventors
Classifications
- G02B6/02Primary
Optical fibres with cladding {with or without a coating} · CPC title
arranged - + · CPC title
Fibre optics, e.g. core and clad fibre compositions (light guides G02B6/00) · CPC title
containing metals · CPC title
containing chlorine · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US10656326B2 cover?
- An optical fiber in which the increase of attenuation can be reduced is offered. An optical fiber is made of silica glass and includes a core and a cladding enclosing the core. The refractive index of the cladding is smaller than that of the core. The core includes chlorine and any of the alkali metal group. The chlorine concentration is 1 ppm or more in the whole region of the core. In the who…
- 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 May 19 2020 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).