Bridge fiber, combiner, and fiber laser device
AssigneeFujikura Ltd.
InventorMasahiro Kashiwagi
Life of this patent
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Abstract
A bridge fiber includes a core layer 31 and an outer layer 32 which has an index of refraction higher than that of the core layer 31 and covers the outer peripheral surface of the core layer 31. The outer layer 32 is surrounded by a substance such as the atmosphere having an index of refraction lower than an index of refraction n2 of the outer layer 32. An area AR1 of the outer layer 32 at one end face of the bridge fiber is an area that is to be optically coupled to an end face of a core of each of a plurality of pumping light inputting optical fibers, while an area AR2 of the core layer 31 at another end face of the bridge fiber is an area that is to be optically coupled to an end face of a core of an amplification optical fiber 40.
Claims14
A bridge fiber comprising:
- a core layer;
- and
- an outer layer which has an index of refraction higher than an index of refraction of the core layer and covers an outer peripheral surface of the core layer, wherein
- the outer layer is surrounded by a substance having an index of refraction lower than the index of refraction of the outer layer,
- an area of the outer layer at one end face of the bridge fiber is an area that is to be optically coupled to an end face of a core of each of a plurality of pumping light inputting optical fibers, and
- an area of the core layer at another end face of the bridge fiber is an area that is to be optically coupled to an end face of a core of an amplification optical fiber.
A combiner comprising:
- a plurality of pumping light inputting optical fibers;
- and
- a bridge fiber including:
- a core layer;
- and
- an outer layer which has an index of refraction higher than an index of refraction of the core layer and covers an outer peripheral surface of the core layer, wherein
- the outer layer is surrounded by a substance having an index of refraction lower than the index of refraction of the outer layer,
- an area of the outer layer at one end face of the bridge fiber is optically coupled to an end face of each of the plurality of pumping light inputting optical fibers, and
- an area of the core layer at another end face of the bridge fiber is an area that is to be optically coupled to an end face of a core of an amplification optical fiber.
A fiber laser device comprising:
- a plurality of pumping light inputting optical fibers;
- an amplification optical fiber;
- a bridge fiber including:
- a core layer;
- and
- an outer layer which has an index of refraction higher than an index of refraction of the core layer and covers an outer peripheral surface of the core layer;
- and
- a pair of mirrors which is disposed at a predetermined distance from each other in the amplification optical fiber, wherein
- the outer layer is surrounded by a substance having an index of refraction lower than the index of refraction of the outer layer,
- an area of the outer layer at one end face of the bridge fiber is optically coupled to an end face of each of the plurality of pumping light inputting optical fibers, and
- an area of the core layer at another end face of the bridge fiber is optically coupled to an end face of a core of the amplification optical fiber.
Dependencies are inferred from the claim text.