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US 12,586,973 B2Granted
Rare earth doped fiber and fiber optic amplifier
AssigneeNTT, Inc.
InventorsYoko Yamashita, Kazuhide Nakajima, Takashi Matsui
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Abstract
An object of the present disclosure is to allow gain compensation with a simple configuration without adding a new device to the outside. The present disclosure discloses a rare earth doped fiber including a core doped with a rare earth and a cladding region around the core, wherein one or more cavities are provided inside the core, and at least one of the cavities are provided along a longitudinal direction of the rare earth doped fiber.
Claims6
A rare earth doped fiber comprising:
- a core doped with a rare earth;
- and
- a cladding region around the core, wherein
- one or more cavities are provided inside the core, and
- at least one of the cavities is provided along a longitudinal direction of the rare earth doped fiber and the at least one of the cavities has a radius configured to reduces loss difference between modes used in a mode multiplexing.
2 more elements
Dependencies are inferred from the claim text.