Single mode optical fibre as well as optical communication system
AssigneeDraka Fibre Technology B.V.
InventorsMark Jetten, Pieter Matthijsse
Life of this patent
Estimating the term…
Abstract
The present invention relates to a single mode optical fibre comprising a first central region having a radius r1, a maximum refractive index value n1 and at least one second ring surrounding said first central region, which second ring has a radius r2 and a minimum refractive index value n2, wherein n2<n1. The present invention furthermore relates to an optical communication system for multi-channel signal transmission.
Claims28
Single mode optical fibre comprising a first central region having a radius r1, a maximum refractive index value n1 and at least one second ring surrounding said first central region, which second ring has a radius r2 and a minimum refractive index value n2, wherein n2<n1, characterized in that the refractive index value n1 is substantially constant in the first central region having radius r1, and in the second ring having radius r2 the refractive index value decreases in radial direction from n1 to n2 over a distance r1-r2, with the decrease, which is substantially linear, taking place in accordance with the following equation:
- slope
- =
- (
- D1
- -
- D2
- )
- /
- (
- r2
- -
- r1
- )
- ,
- where
- 0.11
- <
- slope
- <
- 0.22
- ,
- and
- D
- i
- =
- n
- i
- 2
- -
- n
- Cl
- 2
- 2
- ·
- n
- i
- 2
- ·
- 100
-
- %
-
-
- and
-
-
- n
- i
- >
- n
- Cl
- ,
- Di=refractive index contrast for position i,
- ni=refractive index of position i,
- nc1=refractive index of an outer fibre cladding
- wherein a dispersion slope ranges from 0.07 to 0.095 ps/km2 at 1550 nm.
Single mode optical fibre, comprising a first central region having a radius r1, a maximum refractive index value n1 and at least one second ring surrounding said first central region, which second ring has a radius r2 and a minimum refractive index value n2, wherein n2<n1, characterized in that the refractive index value is substantially constant in the second ring and decreases in radial direction over a distance r1 from n1 to n2 from the central axis of symmetry in the first central region, with the decrease, which is substantially linear, taking place in accordance with the following equation:
- slope
- =
- (
- D1
- -
- D2
- )
- /
- (
- r2
- -
- r1
- )
- ,
- where
- 0.11
- <
- slope
- <
- 0.22
- ,
- D
- i
- =
- n
- i
- 2
- -
- n
- Cl
- 2
- 2
- ·
- n
- i
- 2
- ·
- 100
-
- %
-
-
- and
-
-
- n
- i
- >
- n
- Cl
- ,
- wherein
- Di=refractive index contrast for position i,
- ni=refractive index of position i, and
- nC1 refractive index of an outer fibre cladding.
Single mode optical fibre, comprising a first central region having a radius r1, a maximum refractive index value n1 and at least one second ring surrounding said first central region, which second ring has a radius r2 and a minimum refractive index value n2, wherein n2<n1, characterized in that the refractive index value is substantially constant in the second ring and decreases in radial direction over a distance r1 from n1 to n1″ from the central axis of symmetry in the first central region, with the decrease, which is substantially linear, taking place in accordance with the following equation:
- slope
- =
- (
- D1
- -
- D1
- ″
- )
- /
- (
- r1
- )
- ,
- where
- 0.11
- <
- slope
- <
- 0.22
- ,
- and
- D
- i
- =
- n
- i
- 2
- -
- n
- Cl
- 2
- 2
- ·
- n
- i
- 2
- ·
- 100
-
- %
-
-
- and
-
-
- n
- i
- >
- n
- Cl
- ,
- n1
- >
- n1
- ″
- >
- n2
- ,
- wherein
- Di=refractive index contrast for position i,
- ni=refractive index of position i, and
- nC1=refractive index of an outer fibre cladding.
Dependencies are inferred from the claim text.