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Multlmode fiber

A multi-mode optical fiber and optical fiber technology, which is applied in the direction of cladding optical fiber, multi-mode transmission, optical fiber transmission, etc., can solve the problem of perturbation in fast bit rate transmission, etc.

Inactive Publication Date: 2010-09-15
DRAKA COMTEQ BV
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Problems solved by technology

However, this breaking point can cause perturbations in fast bit-rate transmissions

Method used

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Embodiment Construction

[0036]Optical fiber of the present invention is multimode transmission optical fiber, and it has such as figure 1 The refractive index profile shown. The central core of the fiber has a graded index (α) profile extending to the depressed cladding. The core has a standard radius of 25 μm. In the context of the present invention, the "central core" of an optical fiber refers to a region within which most of the energy of the optical signal is confined, i.e. the region has a refractive index n greater than the refractive index n of the outer cladding g , n>n g . Considering the cost factor, the outer cladding layer is usually natural silicon, but it can also be doped silicon.

[0037] Therefore, the depressed cladding includes: a portion continuous with the α profile of the core; and a stepped portion having a constant refractive index smaller than that of the outer cladding. Depressed cladding refers to the radial portion of the fiber whose refractive index is less than tha...

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Abstract

A multimode optical fiber comprises a central core having an alpha profile, a depressed cladding having a portion in continuity with the alpha profile of the central core and a stepped portion, and an outer cladding. The alpha profile is obtained by co-doping at least two dopants. The variation in concentration of each dopant and its derivative in relation to the fiber radius are continuous. A multimode fiber for Ethernet optical system with an improved bandwidth is thus obtained.

Description

technical field [0001] The present invention relates to the field of optical fiber transmission, and more specifically relates to a multimode optical fiber. The multimode fiber is especially used in short-distance transmission systems requiring large bandwidth. Background technique [0002] Traditionally, an optical fiber consists of a fiber core and an optical cladding. The function of the fiber core is to transmit and amplify the optical signal, and the function of the optical cladding is to confine the optical signal in the fiber core. To achieve this, the refractive index n of the core c Must be greater than the refractive index n of the outer cladding g , namely n c >n g . [0003] For short-distance applications and for local networks, multimode fiber is often used. The core diameter of a multimode fiber is typically about 50 μm, compared to about 9 μm for a single-mode fiber. Thus, for a given wavelength, several light modes carrying the same information pr...

Claims

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Application Information

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IPC IPC(8): G02B6/028G02B6/036H04B10/2581
CPCG02B6/03627G02B6/0288
Inventor 丹尼斯·莫林伊夫·卢米内奥皮埃尔·西亚尔劳夫·彼得鲁斯·若阿内斯·阿德理安努斯·凡-兰科威尔德科恩·德-容
Owner DRAKA COMTEQ BV
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