Multi-core optical fiber and method for manufacturing multi-core optical fiber
AssigneeFujikura Ltd.
InventorsShingo Matsushita, Takuya Oda
Life of this patent
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Abstract
A multi-core optical fiber includes a central core disposed at the center of a cladding; and outer cores helically wound around the central core. The following Formula (1) is satisfied: n e 1 × ( 1 fw - B ) < n e 2 ave × ( 1 fw + A ) < n e 1 × ( 1 fw + B ) A = ( 1 fw ) 2 + ( 2 π d ave ) 2 - 1 fw B = A 1 + A · fw ( 1 ) where dave is an average of a distance d between the central core and the outer cores, fw is the number of helical turns of the outer cores per unit length, ne1 is an effective refractive index of the central core, and ne2ave is an average of effective refractive indices of the outer cores.
Claims15
A multi-core optical fiber comprising:
- a central core disposed at the center of a cladding;
- and
- outer cores helically wound around the central core,
- wherein the following Formula (1) is satisfied:
- n
- e
-
-
- 1
- ×
- (
- 1
- fw
- -
- B
- )
- <
- n
- e
-
-
- 2
-
- ave
- ×
- (
- 1
- fw
- +
- A
- )
- <
- n
- e
-
-
- 1
- ×
- (
- 1
- fw
- +
- B
- )
-
-
- A
- =
- (
- 1
- fw
- )
- 2
- +
- (
- 2
-
- nd
- ave
- )
- 2
- -
- 1
- fw
-
-
- B
- =
- A
- 1
- +
- A
- ·
- fw
- (
- 1
- )
- where
- dave is an average of a distance d between the central core and the outer cores,
- fw is the number of helical turns of the outer cores per unit length,
- ne1 is an effective refractive index of the central core, and
- ne2ave is an average of effective refractive indices of the outer cores.
Dependencies are inferred from the claim text.