Optical fiber and optical fiber preform
US-9335465-B2 · May 10, 2016 · US
Optical fiber
US9817184B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9817184-B2 |
| Application number | US-201615290105-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 11, 2016 |
| Priority date | Oct 15, 2015 |
| Publication date | Nov 14, 2017 |
| Grant date | Nov 14, 2017 |
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 having a reduced attenuation includes a silica glass core and a silica glass cladding. The silica glass core has substantially no germanium and includes a first core and a second core. The second core encloses the first core, the refractive index of the second core is larger than the refractive index of the first core, and the average value of halogen concentration of the second core is 5000 ppm or more. The silica glass cladding surrounds the second core and contains substantially no germanium. The refractive index of the cladding is smaller than the refractive index of the first core.
First claim
Opening claim text (preview).
What is claimed is: 1. An optical fiber comprising: a silica glass core containing substantially no germanium and including a first core and a second core, the second core enclosing the first core, the refractive index of the second core being larger than the refractive index of the first core, and the average value of halogen concentration of the second core being 5000 ppm or more; and a silica glass cladding surrounding the second core and containing substantially no germanium, the refractive index of the cladding being smaller than the refractive index of the first core. 2. An optical fiber as set forth in claim 1 , wherein the relative refractive index difference of the second core is −0.05% or more and +0.05% or less on the basis of the refractive index of pure silica glass. 3. An optical fiber as set forth in claim 1 , wherein the fluorine concentration of the second core is 500 ppm or more and 10000 ppm or less. 4. An optical fiber as set forth in claim 1 , wherein the chlorine concentration of the second core is 4500 ppm or more and 15000 ppm or less. 5. An optical fiber as set forth in claim 1 , wherein the chlorine concentration is higher than the fluorine concentration in the second core. 6. An optical fiber as set forth in claim 1 , wherein the fluorine concentration of the first core is 5000 ppm or more and 15000 ppm or less. 7. An optical fiber as set forth in claim 1 , wherein the chlorine concentration of the first core is 10 ppm or more and 1000 ppm or less. 8. An optical fiber as set forth in claim 1 , wherein the relative refractive index difference between the first core and the second core is 0.05% or more and 0.15% or less. 9. An optical fiber as set forth in claim 1 , wherein the ratio H2/H1 is 1 or more and 2 or less, H2 being the halogen concentration of the second and H1 being the halogen concentration of the first core. 10. An optical fiber as set forth in claim 1 , wherein the core contains both or either one of alkali metal and alkaline earth metal.
Assignees
Inventors
Classifications
- G02B6/03611Primary
Highest index adjacent to central axis region, e.g. annular core, coaxial ring, centreline depression affecting waveguiding · CPC title
Silica-containing oxide glass compositions · CPC title
containing chlorine · CPC title
containing fluorine (C03C2201/14 takes precedence) · CPC title
Glass fibres or filaments · 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 US9817184B2 cover?
- An optical fiber having a reduced attenuation includes a silica glass core and a silica glass cladding. The silica glass core has substantially no germanium and includes a first core and a second core. The second core encloses the first core, the refractive index of the second core is larger than the refractive index of the first core, and the average value of halogen concentration of the secon…
- Who is the assignee on this patent?
- Sumitomo Electric Industries
- What technology area does this patent fall under?
- Primary CPC classification G02B6/03611. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Nov 14 2017 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).