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US 6,640,027 B2Granted
Gain flattening tunable filter
AssigneeNovera Optics, Inc.
InventorsByoung Yoon Kim, Benjamin Vakoc
Life of this patent
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Abstract
An optical apparatus includes an optical fiber. A plurality of individual optical fiber deformation structures are positioned adjacent along a length of the optical fiber. Each of an individual optical fiber deformation structure introduces a mechanical or index deformation of a portion of the optical fiber to create perturbation in the optical modes in the fiber and provide a coherent coupling between two modes in the optical fiber.
Claims37
An optical apparatus, comprising:
- an optical fiber with an interaction region;
- a plurality of individual optical fiber deformation structures positioned adjacent to the optical fiber at the interaction region, each individual optical fiber deformation structure configured to introduce a mechanical or index deformation of a portion of the optical fiber and create perturbations in the optical modes in the fiber and provide a coherent coupling between two modes;
- a circulator coupled to the optical fiber;
- and
- a reflector coupled to the optical fiber, wherein the optical fiber perturbation structures are positioned between the circulator and the reflector.
2 more elements
A dual filter, comprising:
- an optical fiber with an intermediate section;
- a first filter including a first plurality of individual optical fiber deformation structures positioned adjacent along a length of the optical fiber, each individual optical fiber deformation structure configured to introduce a mechanical or index deformation of a portion of the optical fiber to create perturbations in the optical modes in the fiber and provide a coherent coupling between two modes;
- a second filter including a second plurality of individual optical fiber deformation structures positioned adjacent along a length of the optical fiber, each individual optical fiber deformation structure configured to introduce a mechanical or index deformation of a portion of the optical fiber to create perturbations in the optical modes in the fiber and provide a
- coherent coupling between two modes, wherein the intermediate section is positioned between the first and second filters;
- and
- a feedback control coupled to the first and second pluralities of individual optical fiber deformation structures, positioned to monitor a signal output received from the apparatus and generate a feedback signal in response to the monitoring of the signal output, the first and second pluralities of individual optical fiber deformation structures producing a selected deformation adjustment of the optical fiber in response to the feedback signal.
3 more elements
An optical apparatus, comprising:
- an optical circulator with at least a first port configured to be coupled to an input fiber, a second port configured to be coupled to an output fiber and a third port configured to be coupled to an optical fiber;
- and
- a fiber deformation structure positioned adjacent along a length of the optical fiber, the fiber deformation structure including a plurality of individual optical fiber deformation structures configured to introduce a mechanical or index deformation of a portion of the optical fiber to create perturbations in the optical modes in the fiber and provide a coherent coupling between two modes of the optical fiber.
An add/drop apparatus, comprising:
- an optical fiber with an interaction region;
- a first mode selective coupler coupled to the optical fiber;
- a second mode selective coupler coupled to the optical fiber;
- and
- a plurality of individual optical fiber deformation structures positioned adjacent to the optical fiber at the interaction region between the first and second mode selective couplers, each individual optical fiber deformation structure configured to introduce a mechanical or index deformation of a portion of the optical fiber and create perturbations in the optical modes in the fiber and provide a coherent coupling between two modes.
2 more elements
Dependencies are inferred from the claim text.