Dispersion shift optical fiber

一种色散位移光纤、芯体的技术，应用在包层光纤、多层芯/包层的光纤、光学等方向，能够解决芯体截面面积色散斜率降低等问题

Inactive Publication Date: 2005-06-08
FUJIKURA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, in the dispersion-shifted fiber proposed in the past, it is difficult to simultaneously expand the effective core cross-sectional area and reduce the dispersion slope under the condition of using a single mode or ensuring that the bending loss is below 100dB / m.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0067] figure 1 Showing the shape of the refractive index distribution of the dispersion-shifted optical fiber of this embodiment, on the outer periphery of the central central core 1, a peripheral core 2 having a higher refractive index than the central core 1 is provided to form a double-layer core 5 . In addition, on the outer periphery of this core 5 , a cladding 6 having a refractive index smaller than that of the above-mentioned peripheral core 2 is provided. That is, the refractive index distribution shape of the three-layer structure including the cladding layer 6 is constituted.

[0068] In this dispersion-shifted optical fiber, for example, the central core 1 is formed of silica glass doped with fluorine having the function of lowering the refractive index, or silica glass doped with germanium having the function of raising the refractive index, or pure silica glass, and the peripheral cores 2 is made of quartz glass doped with germanium, and the cladding 6 is mad...

no. 2 Embodiment

[0111] The refractive index distribution shape of the dispersion-shifted optical fiber of the present embodiment and figure 1 Same as shown.

[0112] For the dispersion-shifted optical fiber of this embodiment, the effective core cross-sectional area is 45-70 μm in the above-mentioned use band 2 Within the range, the wavelength dispersion value is in the range of -6~+6ps / km / nm, and the dispersion slope is in the range of 0.05~0.08ps / km / nm 2 In the range of , the bending loss is below 100dB / m, and it has substantially a cut-off wavelength for single-mode transmission.

[0113] In this embodiment, if the effective core cross-sectional area is less than 45 μm 2 , the suppression of nonlinear effects is not sufficient. When the effective core cross-sectional area exceeds 70μm 2 , and the dispersion slope is less than 0.08ps / km / nm 2 , it is difficult to manufacture.

[0114] In addition, in this embodiment, if the dispersion slope of the used band exceeds 0.08ps / km / nm 2 , f...

no. 3 Embodiment

[0125] The dispersion-shifted optical fiber of this embodiment is characterized in that in the used wavelength band, the effective core cross-sectional area is 45-120 μm 2 , the dispersion slope is 0.03~0.10+ps / km / nm 2In the range of , the bending loss is below 100dB / m, the absolute value of the wavelength dispersion value is in the range of 0.5-8ps / km / nm, and substantially forms the cut-off wavelength of pure mode transmission.

[0126] image 3 An example of a double-sealed ring-type refractive index distribution shape of the dispersion-shifted optical fiber of this embodiment is shown. The refractive index distribution shape is composed of a core 5 and a cladding 6 provided on the outer periphery of the core 5. The body 5 is provided with a peripheral core (first ring portion) 2' having a higher refractive index than the cladding 6 on the outer periphery of the central core 1 whose refractive index is lower than that of the cladding 6. ' on the outer periphery of the seco...

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Abstract

The present invention provides a dispersion-shifted optical fiber, which is formed by a core and a cladding provided on its outer periphery, the core includes a central core; a peripheral core, the peripheral core is arranged on the outer periphery of the central core, and its refractive higher than that of the central core, the cladding has a refractive index profile whose refractive index is smaller than that of the peripheral core, and by properly setting the structural parameters, it is substantially a single mode, and the bending loss is below 100dB / m condition, in addition, the effective core cross-sectional area can be sufficiently increased, and the dispersion slope can be reduced.

Description

[0001] This case is a divisional case of the parent case (00801834.0). technical field [0002] The present invention relates to a dispersion-shifted optical fiber designed in such a way that the wavelength dispersion value in the 1.55 μm region where the Rayleigh loss of the quartz-based optical fiber is the smallest is substantially zero, and the present invention particularly relates to a large effective core cross-sectional area, and has Types of smaller dispersion slopes. Background technique [0003] In the past, in long-distance systems such as optical amplification relay transmission systems using optical fiber amplifiers, it was important to reduce nonlinear optical effects in order to suppress deterioration of transmission characteristics. [0004] The magnitude of the nonlinear effect is shown by n2 / Aeff. Here, n2 represents the nonlinear refractive index of the fiber, and Aeff represents the effective core cross-sectional area of ​​the fiber. Therefore, in orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036
CPCG02B6/02019G02B6/02238G02B6/03611G02B6/03633G02B6/03644G02B6/0365G02B6/03666
Inventor 松尾昌一郎谷川庄二
Owner FUJIKURA LTD
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