Device, method and system for calculating power coupling coefficients between cores
AssigneeNTT, Inc.
InventorsAtsushi Nakamura, Yusuke Koshikiya, Nazuki Honda
Life of this patent
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Abstract
A device according to the present disclosure: acquires a group delay time difference between eigenmodes, at a specific wavelength, in a coupled two-core fiber; acquires spatial mode dispersion between the eigenmodes, at the specific wavelength, in the coupled two-core fiber; and calculates an average power coupling coefficient between cores, at the specific wavelength, within an entire length of the coupled two-core fiber by using the group delay time difference, the spatial mode dispersion, and a length of the coupled two-core fiber.
Claims4
A method comprising:
- acquiring a group delay time difference between eigenmodes, at a specific wavelength, in a coupled two-core fiber;
- acquiring spatial mode dispersion between the eigenmodes, at the specific wavelength, in the coupled two-core fiber;
- calculating an average power coupling coefficient between cores, at the specific wavelength, within an entire length of the coupled two-core fiber by using the group delay time difference, the spatial mode dispersion, and a length of the coupled two-core fiber, wherein the power coupling coefficient is calculated by using Expression C2,
- [
- Math
- .
- C2
- ]
-
- Δ
-
- τ
- =
- d
-
- Δ
-
- β
- d
-
- ω
-
- L
- h
- (
- C2
- )
- where Δτ represents the spatial mode dispersion between the eigenmodes, at the specific wavelength, in the coupled two-core fiber, dΔβ/dω represents the group delay time difference between the eigenmodes, at the specific wavelength, in the coupled two-core fiber, L represents a fiber length of the coupled two-core fiber, and h represents a power coupling coefficient between cores;
- and
- optimizing design of the coupled two-core fiber using the power coupling coefficient.
A system that calculates a power coupling coefficient between cores of a coupled two-core fiber, the system comprising:
- a light source configured to inject light into the coupled two-core fiber;
- a light receiving unit configured to receive light propagating through the coupled two-core fiber;
- a processor interfaced with the light receiving unit;
- and
- a storage medium having computer program instructions stored thereon, when executed by the processor, perform to:
- acquire a group delay time difference between eigenmodes, at a specific wavelength, in a coupled two-core fiber using the light injected by the light source and received by the light receiving unit;
- acquire spatial mode dispersion between the eigenmodes, at the specific wavelength, in the coupled two-core fiber using the light injected by the light source and received by the light receiving unit;
- and
- calculate an average power coupling coefficient between cores, at the specific wavelength, within an entire length of the coupled two-core fiber by using the group delay time difference, the spatial mode dispersion, and a length of the coupled two-core fiber, wherein the power coupling coefficient is calculated by using Expression C1,
- [
- Math
- .
- C1
- ]
-
- Δ
-
- τ
- =
- d
-
- Δ
-
- β
- d
-
- ω
-
- L
- h
- (
- C1
- )
- where Δτ represents the spatial mode dispersion between the eigenmodes, at the specific wavelength, in the coupled two-core fiber, dΔβ/dω represents the group delay time difference between the eigenmodes, at the specific wavelength, in the coupled two-core fiber, L represents a fiber length of the coupled two-core fiber, and h represents a power coupling coefficient between cores.
Dependencies are inferred from the claim text.