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US 10,760,992 B2Granted
Optical power monitor device and optical power monitor method
AssigneeFujikura Ltd.
InventorMasahiro Kashiwagi
Life of this patent
Estimating the term…
Abstract
An optical power monitor device includes a first optical fiber, including a core and a cladding surrounding the core and being at least one of an incidence-side optical fiber and a launch-side optical fiber connected to each other at a connection point, which is constituted by a curve portion and a linear portion between the curve portion and the connection point, a low refractive index layer that is provided in at least a portion of the linear portion on an outer side of the cladding and has a refractive index lower than a refractive index of the cladding, and a first optical detector that is provided at a position close to at least the curve portion.
Claims11
An optical power monitor device comprising:
- a first optical fiber comprising a core and a cladding surrounding the core, the first optical fiber being either one of an incidence-side optical fiber or a launch-side optical fiber, the incidence-side optical fiber and the launch-side optical fiber being connected to each other at a connection point and being constituted by a curve portion and a linear portion positioned between the curve portion and the connection point;
- a second optical fiber being the other one of the incidence-side optical fiber or the launch-side optical fiber;
- a low refractive index layer that is provided in at least a part of the linear portion on an outer side of the cladding and has a refractive index lower than a refractive index of the cladding;
- a first optical detector that is provided at a position close to the curve portion, the first optical detector disposed on a first optical fiber side of the connection point and configured to detect a power of a light beam propagating in the first optical fiber from the connection point toward the first optical fiber;
- and
- a second optical detector disposed on a second optical fiber side of the connection point and configured to detect a power of a light beam propagating in the second optical fiber from the connection point toward the second optical fiber.
3 more elements
An optical power monitor method comprising:
- preparing a first optical fiber which comprises a core and a cladding surrounding the core and is either one of an incidence-side optical fiber or a launch-side optical fiber, the incidence-side optical fiber and the launch-side optical fiber being connected to each other at a connection point, and a second optical fiber which is the other one of the incidence-side optical fiber or the launch-side optical fiber;
- providing a low refractive index layer having a refractive index lower than a refractive index of the cladding in at least a portion on an outer side of the cladding;
- providing a first optical detector which is disposed on a first optical fiber side of the connection point;
- providing a second optical detector which is disposed on a second optical fiber side of the connection point;
- forming a curve portion by curving a portion of the first optical fiber;
- detecting, by the first optical detector, leaked light of output light or reflected light, which is guided toward the curve portion from the connection point, in the curve portion;
- and
- detecting, by the second optical detector, leaked light of output light or reflected light, which propagates toward the second optical fiber from the connection point.
5 more elements
An optical power monitor device comprising:
- a first optical fiber comprising a cote and a cladding surrounding the core, the first optical fiber being either one of an incidence-side optical fiber or a launch-side optical fiber, the incidence-side optical fiber and the launch-side optical fiber being connected to each other at a connection point and being constituted by a curve portion and a linear portion positioned between the curve portion and the connection point;
- a second optical fiber being the other one of the incidence-side optical fiber or the launch-side optical fiber;
- a low refractive index layer that is provided in at least a part of the linear portion on an outer side of the cladding and has a refractive index lower than a refractive index of the cladding;
- and
- a first optical detector that is provided at a position close to the curve portion,
- wherein the second optical fiber includes no low refractive index layer on the outer side of the cladding.
3 more elements
An optical power monitor method comprising:
- preparing a first optical fiber which comprises a core and a cladding surrounding the core and is either one of an incidence-side optical fiber or a launch-side optical fiber, the incidence-side optical fiber and the launch-side optical fiber being connected to each other at a connection point, and a second optical fiber which is the other one of the incidence-side optical fiber or the launch-side optical fiber;
- forming a curve portion by curving a portion of the first optical fiber;
- forming a linear portion positioned between the curve portion of the first optical fiber and the connection point;
- providing a low refractive index layer having a refractive index lower than a refractive index of the cladding in at least a portion on an outer side of the cladding of the linear portion;
- providing the second optical fiber without the low refractive index layer on the outer side of the cladding;
- and
- detecting leaked light of output light or reflected light, which is guided toward the curve portion from the connection point, in the curve portion.
4 more elements
Dependencies are inferred from the claim text.