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Mode-field resizing in optical fibers

A technology of optical fiber and mode field area, applied in the coupling of optical waveguide, optics, light guide, etc., can solve the problems of increased signal or pump loss and reduced manufacturing yield

Inactive Publication Date: 2008-11-05
FURAKAWA ELECTRIC NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this sizer adds an additional splice, which can lead to increased signal or pump losses, signal reflections, coupling to higher order modes, and lower manufacturing yields

Method used

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  • Mode-field resizing in optical fibers
  • Mode-field resizing in optical fibers
  • Mode-field resizing in optical fibers

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Embodiment Construction

[0026] Mode Field Resizer - Generic

[0027] Before discussing the present invention in detail, turning first to FIG. 3, there is shown an apparatus, subsystem or system 30 comprising a first usage device 32 and a second usage device 34 coupled to each other by a fiber optic link.

[0028]The use devices 32, 34 may include numerous optical and / or optoelectronic devices, such as light sources, light receivers, or both. Typical light sources are activators or laser-amplifier combinations. Typical lasers are fiber lasers or semiconductor lasers. Of course, other types of lasers or laser-amplifier combinations are also suitable. On the other hand, a typical optical receiver is a length of optical fiber, an optical amplifier, an optical multiplexer, an optical circulator, a grating, a large number of optical components, an optical isolator, an optical detector, an optical receiver, and so on. As an illustration, when one of the devices is used comprising a light source, the ot...

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PUM

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Abstract

An all-fiber mode-field resizer comprises a first optical fiber configured to propagate signal light in a predetermined transverse mode along a longitudinal axis from a first input / output (I / O) port to a second I / O port. The first fiber is configured to have a first effective mode-field area and a first core V-parameter proximate the first I / O port and to have a second effective mode-field area and a second core V-parameter proximate the second I / O port. The second mode-field area is greater than the first mode-field area, and the second V-parameter is less than the first V-parameter. In one embodiment, the second V-parameter is less than approximately 1.3, and preferably less than 1.0. In another embodiment, the first V-parameter is greater than approximately 1.8. In yet another embodiment, our mode-field resizer is incorporated into a tapered fiber bundle.

Description

technical field [0001] The invention relates to the adjustment of the mode field size in optical fibers, and in particular to high-power devices that need to match the mode field sizes of different optical fibers to each other. Background technique [0002] Recently, high power fiber lasers and amplifiers have received a lot of attention. These devices typically use double-clad fibers (DCFs), and such fibers have the refractive index profile illustrated in FIG. 1 . The DCF includes a core region 12 that may be doped with a gain-generating species such as a rare earth element, an inner cladding 14 for confining signal light in the core region, and an outer cladding 16, which may be a low-index polymer material or low refractive index glass. The inner cladding 14 also acts as a core for the multimode pump light confined by the outer cladding 16 . When pump light is injected into the inner cladding 14, it can be absorbed in the core region 12, and the signal light can be amp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/27H01S3/094G02B6/26
CPCH01S3/06754G02B6/14G02B6/2856
Inventor D·J·迪乔瓦尼C·海德雷A·D·亚布隆
Owner FURAKAWA ELECTRIC NORTH AMERICA INC