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Optical fiber

A technology of optical fiber and fiber core, applied in cladding optical fiber, light guide, optics, etc., can solve the problem of signal light deterioration

Inactive Publication Date: 2003-12-31
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, if the dispersion in the 1.55-μm band is substantially 0, four-wave mixing (four-wave mixing), which is a nonlinear optical phenomenon, may occur, so that the signal light is likely to change when received. Bad (see eg OFC'98 by H. Taga et al., PD13)

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no. 1 example

[0034] Figure 1A is a view showing the cross-sectional structure of the optical fiber according to the first embodiment, and Figure 1B yes Figure 1A The refractive index profile of the fiber shown. According to the optical fiber 100 of the first embodiment, comprising a fiber extending along a predetermined axis and having a refractive index n 1 A core region 110 with an outer diameter of 2a (μm), and a cladding region disposed on the periphery of the core region 110 . In order to realize the depressed cladding structure, the cladding region has an inner cladding layer 120 and an outer cladding layer 130. The inner cladding layer is arranged on the periphery of the core region 110 and has a refractive index n 2 (1 ) and an area of ​​the outer diameter 2b, and the outer cladding is disposed on the periphery of the inner cladding 120 and has a refractive index n 3 (1 ,>n 2 ) of an area. Thus, the relative refractive indices of the regions 110, 120, and 130 have a relation...

no. 2 example

[0131] Now, an optical fiber of a second embodiment of the present invention will be described. FIG. 8A is a view showing a cross-sectional structure of an optical fiber according to the second embodiment, and Figure 8B is the refractive index distribution curve of the optical fiber shown in FIG. 8A . The optical fiber 200 according to the second embodiment includes an optical fiber extending along a predetermined axis and having a refractive index n 1 The core area 210 and a set on the periphery of the core area 210 and have a refractive index n 2 (1 ) cladding region 220. Therefore, the corresponding refractive indices of the regions 210, 220 are related by their magnitude n 1 >n 2 . In order to effectively prevent breakage when the assembly is fabricated by the coil winding method, the outer periphery of the optical fiber 200 according to the second embodiment has a carbon coating 230 .

[0132] expressed in Figure 8B The abscissa of the refractive index distributi...

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Abstract

The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 mum in order to compensate for a negative dispersion inherent in an NZ-DSF in the said wavelength band. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, disposed at the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. The relative refractive index difference of the core region with respect to the outer cladding is at least 0.30% but not greater than 0.50%, and the relative refractive index difference of the inner cladding with respect to the outer cladding is at least -0.50% but not greater than -0.02%. Also, the optical fiber has a dispersion greater than 18 ps / nm / km at a wavelength of 1.55 mum, and an effective cross-sectional area Aeff of at least 70 mum2.

Description

technical field [0001] The present invention relates to an optical fiber applicable to a component installed in a part of or on an optical transmission line in an optical transmission system mainly performing WDM communication in the 1.55-μm band. Background technique [0002] The WDM (Wavelength Division Multiplexing) communication system can perform large-capacity, high-speed optical communication by transmitting multiple signal light components in the 1.55-μm band (1.53μm-1.57μm). Since the optical transmission system for this WDM communication preferably has a small dispersion in the 1.55-μm band, so that signal light can be transmitted in a wide band, a kind of zero-dispersion wavelength shifted is used in its optical transmission line. Dispersion-Shifted Fiber (DSF: Dispersion-Shifted Fiber) to the 1.55-μm band. [0003] However, if the dispersion in the 1.55-μm band is substantially 0, four-wave mixing (four-wave mixing), which is a nonlinear optical phenomenon, may ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036G02B6/02
CPCG02B6/03611G02B6/0283G02B6/03627G02B6/02266G02B6/02014
Inventor 加藤考利岡本和弘羽田光臣萩原真二郎渡边守生小林宏平
Owner SUMITOMO ELECTRIC IND LTD