Single mode optical fibre as well as optical communication system
AssigneeDraka Comteq B.V.
InventorsMark Peter Marie Jetten, Pieter Matthijsse
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Abstract
The present invention relates to a single mode optical fiber 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.
Claims19
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
- =
- (
- D
-
-
- 1
- -
- D
-
-
- 2
- )
- /
- (
- r
-
-
- 1
- )
- ,
-
- where
- 0.11
- <
- slope
- <
- 0.22
- ,
-
- D
- i
- =
- n
- i
- 2
- -
- n
- C
-
-
- 1
- 2
- 2
- ·
- n
- i
- 2
- ·
- 100
-
- %
-
- and
-
- n
- i
- >
- n
- C
-
-
- 1
- ,
- wherein
- Di=refractive index contrast for position i,
- ni=refractive index of position i, and
- nCl=refractive index of an outer fibre cladding.
A single mode optical fibre, comprising:
- a first central region defining a radius r1, said first central region having a maximum refractive index value n1max and a minimum refractive index value n1min;
- and
- a second ring surrounding said first central region, wherein said second ring has a substantially constant refractive index value n2 that is less than or equal to the minimum refractive index value n1min of the first central region;
- wherein the refractive index value of the first central region decreases from the central axis of symmetry in the first central region in a radial direction over a distance equal to the radius r1, the refractive index value decreasing from n1max to n1min in a substantially linear fashion, whereby said first central region is substantially free of a portion having a constant refractive index value, and wherein the decrease takes place in accordance with the following equation:
- slope
- =
- (
- D
-
-
- 1
- -
- D
-
-
- 1
- )
- /
- (
- r
-
-
- 1
- )
- ,
-
- wherein
- 0.11
- <
- slope
- <
- 0.22
- ,
-
- D
- i
- =
- n
- i
- 2
- -
- n
- C
-
-
- 1
- 2
- 2
- ·
- n
- i
- 2
- ·
- 100
-
- %
-
- and
-
- n
- i
- >
- n
- C
-
-
- 1
- ,
- and wherein
- Di=refractive index contrast for position i,
- ni=refractive index value of position i, and
- nCl=refractive index value of an outer fibre cladding.
Dependencies are inferred from the claim text.