Few mode optical fibers for space division multiplexing
US-9638856-B2 · May 2, 2017 · US
Few mode optical fiber links for space division multiplexing
US2016231503A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016231503-A1 |
| Application number | US-201315023126-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 20, 2013 |
| Priority date | Sep 20, 2013 |
| Publication date | Aug 11, 2016 |
| Grant date | — |
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Abstract
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The invention relates to an optical link comprising N optical fibers, with N≧2. Each optical fiber comprises an optical core and an optical cladding surrounding the optical core, the optical core having a single α i graded-index profile with α i ≧1, and the optical core having a radius R 1i , where i E [1; N] is an index designating said optical fiber. Said optical cladding comprises a region of depressed refractive index n trenchi , called a trench, surrounding the optical core. According to embodiments of the invention, for all optical fibers in said link, said optical core radius R 1i and said length L i are chosen such that R 1i ≧13.5 μm and so as to satisfy a criterion C of quality. Thus, the invention provides a few-mode optical fiber link, which allow guiding an increased number of LP modes as compared to prior art FMF links, while reaching low Differential Mode Group Delay.
First claim
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1 . An optical link comprising N optical fibers, with N≧2, N being an integer, each optical fiber comprising an optical core and an optical cladding surrounding the optical core, the optical core having a single α i graded-index profile with α i ≧1, α i being a non-dimensional parameter defining an index profile shape of the optical core, and the optical core having a radius R 1i and a maximal refractive index n 0i , where iε[[1; N]] is an index designating said optical fiber, wherein the optical cladding having n Cli , a refractive index n Cli at an outer edge of the optical cladding, wherein said optical cladding comprises a region of depressed refractive index-n trenchi , n trench being a trench, surrounding the optical core, said trench having an inner radius R 2i , with R 2i ≧R 1i , and an outer radius R 3i , with R 3i >R 2i , said optical link having an average optical core radius R 1link satisfying a criterion C of quality of optical communications defined by the following equation: C = 10 · Max | DMGD link | ( R 1 link 2 · Dn 1 link ) 3 where DMGD link is the Differential Mode Group Delay between two guided modes in said optical link, where Max|DMGD link | is an absolute maximum value of Differential Mode Group Delay between any combination of guided modes in said optical link, where R 1 link = ∑ i = 1 N R 1 i L i ∑ i = 1 N L i with L i a length of optical fiber i in said link, and where Dn 1 link = ∑ i = 1 N Dn 1 i L i ∑ i = 1 N L i with Dn 1 =n Ci −n Cli is a core-cladding index difference for optical fiber i, at λ=λ C , where λ C is a central transmission wavelength of an operating band for the optical fiber, and for at least one optical fiber i in said link, said optical core radius R 1 is chosen such that R 1i ≧13.5 μm and for all optical fibers iε[[1; N]] in said link, said length L i are chosen such that C≦18. 2 . The optical link according to claim 1 , wherein at least one of said optical fibers has trench parameters 55≦1000·|(R 3i −R 2i )·Dn 3i ·(R 1 2 ·Dn 1i )|≦150 where Dn 3i =n trenchi −n Cli , is the trench-cladding index difference at λ=λ C . 3 . The optical link according to claim 2 , wherein Dn 3 ≦−3.10 −3 . 4 . The optical link according to claim 1 , wherein at least one of said optical fibers has an optical core radius R 1i and an α i -value of said graded index profile such that: C = 10 · Max | DMGD i | ( R 1 i 2 · Dn 1
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Mode multiplex systems · CPC title
tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened · CPC title
arranged - + · CPC title
arranged - - + · CPC title
- G02B6/0288Primary
Multimode fibre, e.g. graded index core for compensating modal dispersion · CPC title
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- What does patent US2016231503A1 cover?
- The invention relates to an optical link comprising N optical fibers, with N≧2. Each optical fiber comprises an optical core and an optical cladding surrounding the optical core, the optical core having a single α i graded-index profile with α i ≧1, and the optical core having a radius R 1i , where i E [1; N] is an index designating said optical fiber. Said optical cladding comprises a region …
- Who is the assignee on this patent?
- Draka Comteq Bv
- What technology area does this patent fall under?
- Primary CPC classification G02B6/0288. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Aug 11 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).