Novel highly germanium-doped -type light-sensitive optical fibre and method for making same

An optical fiber, highly doped technology, applied in the direction of cladding fiber, optical waveguide light guide, glass manufacturing equipment, etc., can solve the influence of fiber grating sensor network signal, increase the core refractive index of the fiber, reduce the fiber mode field diameter, etc. problem, to achieve the effect of excellent sensing elements, avoid excessive attenuation, and avoid high attenuation

Active Publication Date: 2010-10-20
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some deficiencies in the design of such a sensor network structure: Fiber Bragg gratings are widely used in distributed sensor networks, so there are a large number of fusion points of photosensitive optical fibers and transmission fibers, and these fusion points will be As the environment changes, it will affect the signal of the fiber grating sensor network. At the same time, the attenuation of the signal formed by these fusion points should also enter the level that needs to be considered.
However, increasing the doping amount of germanium will increase the defects in the fiber, and at the same time, due to the increase of Rayleigh scattering in the fiber, the attenuation of the fiber will increase; it will also increase the refractive index of the core layer of the fiber, resulting in an increase in the NA value of the fiber. , thereby reducing the mode field diameter of the working wavelength of the fiber, which will have a great impact on the coupling characteristics of the fiber during use and increase the attenuation at the coupling

Method used

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  • Novel highly germanium-doped -type light-sensitive optical fibre and method for making same
  • Novel highly germanium-doped -type light-sensitive optical fibre and method for making same
  • Novel highly germanium-doped -type light-sensitive optical fibre and method for making same

Examples

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Effect test

Embodiment 1

[0036] Example 1: (0.25)

[0037] In this example, using figure 1 The refractive index profile of the high-doped germanium-doped photosensitive fiber is used to set the PCVD process of the optical fiber. First, the cladding is deposited, and then the core is deposited; the core is inserted into the cladding for melting and shrinking to obtain a preform; The preform is drawn to obtain an optical fiber; the core layer is doped with 46% germanium element, and the germanium element is doped by adding germanium tetrachloride and oxygen to the core layer of the optical fiber to react; during the deposition process of the core layer Passed a lot of O 2 , and control the oxygen-silicon ratio to 3.0; the deposition rate of the core layer is 0.5g / min; in the process of melting and shrinking, control the shrinkage aperture to 2mm; when drawing, control the drawing temperature to 2000°C, and finally obtain a photosensitive optical fiber with a cut-off The wavelength is in the range of 1...

Embodiment 2

[0038] Example 2: (0.28)

[0039] In this example, using figure 1 The refractive index profile of the high-doped germanium-doped photosensitive fiber is used to set the PCVD process of the optical fiber. First, the cladding is deposited, and then the core is deposited; the core is inserted into the cladding for melting and shrinking to obtain a preform; The preform is drawn to obtain an optical fiber; the core layer is doped with 50% germanium element, and the germanium element is doped by adding germanium tetrachloride and oxygen to the core layer of the optical fiber for reaction; during the deposition process of the core layer Passed a lot of O 2 , and control the oxygen-silicon ratio to 4.5; the deposition rate of the core layer is 1g / min; during the melting and shrinking process, control the shrinkage aperture to 7mm; when drawing, control the drawing temperature to 2100°C, and finally obtain a photosensitive optical fiber. The doping of germanium leads to the increase ...

Embodiment 3

[0040] Example 3: (0.31)

[0041] In this example, using figure 1 The refractive index profile of the high-doped germanium-doped photosensitive fiber is used to set the PCVD process of the optical fiber. First, the cladding is deposited, and then the core is deposited; the core is inserted into the cladding for melting and shrinking to obtain a preform; The preform is drawn to obtain an optical fiber; the core layer is doped with 54% germanium element, and the germanium element is doped by adding germanium tetrachloride and oxygen to the core layer of the optical fiber to react; during the deposition process of the core layer Passed a lot of O 2 , and control the oxygen-silicon ratio to 4.0; the deposition rate of the core layer is 0.8g / min; in the process of melting and shrinking, control the shrinkage aperture to 4mm; when drawing, control the drawing temperature to 2050°C, and finally obtain a photosensitive optical fiber. The doping of germanium leads to the increase of ...

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Abstract

The invention relates to a novel Ge-heavily-doped photosensitive fiber, which is doped with 46% to 54% Ge element in the core layer of an optical fiber with an NA value of 0.25 to 0.31. The Ge-heavily-doped photosensitive fiber has large mode field diameter and small attenuation, and can satisfy the requirement for signal transmission and sensing, so that a fiber grating can be directly etched ona certain section of an optical fiber segment and the rest section serves as the optical fiber for transmitting signal. The invention has a significant characteristic that the photosensitive fiber has very high photosensitive performance, and the fiber grating can be directly etched in the core of the optical fiber without hydrogen loading treatment, etc. The invention can save a great amount of processing program and time and can provide excellent sensing element for an optical fiber sensor system.

Description

technical field [0001] The method invention relates to a kind of optical fiber-photosensitive optical fiber in the field of optical fiber communication and optical fiber sensing, in particular a novel high germanium-doped photosensitive optical fiber. The optical fiber can be used in the 1310nm or 1550nm window, the grating is written in the core layer of the optical fiber, and the sensing performance of the grating is used. Background technique [0002] In 1978, K.O.Hill and others at the Canadian Communication Research Center detected the photosensitivity of optical fibers. In the experiment, when they injected a beam of argon ion laser into the germanium-doped fiber, they found that the laser output power was greatly reduced. This is because the two beams of light transmitted oppositely in the optical fiber interfere to form a periodic standing wave pattern, which induces a periodic refractive index distribution in the optical fiber, that is, the formation of a Bragg gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B1/00C03B37/01
Inventor 涂峰罗杰韩庆荣
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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