Chromatic dispersion compensating fiber
AssigneeDraka Comteq B.V.
InventorsMarianne Bigot-Astruc, Louis-Anne De Montmorillon, Denis Molin, Pierre Sillard
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Abstract
Disclosed are an improved system and a related method for compensating the chromatic dispersion of a given length of a transmission fiber over a given spectral band by employing at least two chromatic dispersion compensating fibers that, with respect to the slope of the slope of the chromatic dispersion (SSi), have values of opposite signs.
Claims10
An optical transmission system over a given spectral band, the system comprising:
- a given length (L0) of an optical transmission fiber having, at a median wavelength (λ0) of the given spectral band, a given chromatic dispersion D0(λ0) and a given slope of the chromatic dispersion S0(λ0);
- and
- at least two chromatic dispersion compensating fibers (DCFi) of respective length (Li), each dispersion compensating fiber having, at the median wavelength (λ0), given values of chromatic dispersion Di(λ0) and of slope of the chromatic dispersion Si(λ0) that substantially satisfy the following equations:
- D
- 0
-
- (
- λ
- 0
- )
- ·
- L
- 0
- +
- ∑
- i
-
- (
- D
- i
-
- (
- λ
- 0
- )
- ·
- Li
- )
- =
- 0
-
-
- ps
-
- /
-
- nm
- S
- 0
-
- (
- λ
- 0
- )
- ·
- L
- 0
- +
- ∑
- i
-
- (
- S
- i
-
- (
- λ
- 0
- )
- ·
- Li
- )
- =
- 0
-
-
- ps
-
- /
-
- nm
- 2
- wherein at least two of the dispersion compensating fibers have values for the slope of the slope of the dispersion SSi(λ0) of opposite signs.
An optical transmission system over a spectral band having a spectral width of about 40 nm or less, the system comprising:
- a given length (L0) of an optical transmission fiber having, at a median wavelength (λ0) of the given spectral band, a given chromatic dispersion D0(λ0) and a given slope of the chromatic dispersion S0(λ0);
- and
- at least two chromatic dispersion compensating fibers (DCFi) of respective length (Li), the chromatic dispersion compensating fibers in communication with the optical transmission fiber;
- wherein each dispersion compensating fiber has, at the median wavelength (λ0), given values of chromatic dispersion Di(λ0) and of slope of the chromatic dispersion Si(λ0) that substantially satisfy the following equations:
- D
- 0
-
- (
- λ
- 0
- )
- ·
- L
- 0
- +
- ∑
- i
-
- (
- D
- i
-
- (
- λ
- 0
- )
- ·
- Li
- )
- =
- 0
-
-
- ps
-
- /
-
- nm
- S
- 0
-
- (
- λ
- 0
- )
- ·
- L
- 0
- +
- ∑
- i
-
- (
- S
- i
-
- (
- λ
- 0
- )
- ·
- Li
- )
- =
- 0
-
-
- ps
-
- /
-
- nm
- 2
- wherein at least two of the dispersion compensating fibers have values for the slope of the slope of the dispersion SSi(λ0) of opposite signs;
- and
- wherein the values for the slope of the slope of the dispersion (SSi) of the compensation fibers (DCFi) also substantially satisfy the following equation:
-
- ∑
- i
-
- (
- SS
- i
-
- (
- λ
- 0
- )
- ·
- L
- i
- )
- L
- 0
-
- <
- 0.002
-
-
- ps
-
- /
-
- nm
- 3
-
- /
-
- km
- .
A method for compensating the chromatic dispersion of a given length (L0) of a transmission fiber over a given spectral band, the method comprising:
- selecting at least two chromatic dispersion compensating fibers (DCFi) each having a given value for the slope of the slope of the dispersion (SSi) at a median wavelength (λ0) of the given spectral band, at least two dispersion compensating fibers being chosen with values for the slope of the slope of the dispersion SSi(λ0) of opposite signs;
- and
- assembling given lengths (Li) of each dispersion compensating fiber;
- wherein the dispersion compensating fibers are selected and the lengths of each selected fiber are chosen to substantially satisfy the following equation:
-
- ∑
- i
-
- (
- SS
- i
-
- (
- λ
- 0
- )
- ·
- L
- i
- )
- L
- 0
-
- <
- 0.002
-
-
- ps
-
- /
-
- nm
- 3
-
- /
-
- km
- .
Dependencies are inferred from the claim text.