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A step-type ultra-low attenuation common-mode fiber

An ultra-low attenuation, step-type technology, applied in cladding fiber, multi-layer core/cladding fiber, graded index core/cladding fiber, etc., can solve the problem of reducing the core layer and difficult fiber attenuation and other issues, to achieve the effect of ultra-low attenuation performance, excellent bending resistance performance and cost reduction

Active Publication Date: 2020-04-21
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

We noticed that the attenuation level of this design is greater than 0.162dB / km, if it cannot solve the concentration factor increase caused by the co-doping of germanium and fluorine in the core layer and continue to reduce the viscosity of the core layer; and solve the higher viscosity of the outer cladding layer and the auxiliary inner cladding layer Viscosity mismatch, this solution is difficult to continue to reduce the attenuation of the fiber

Method used

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  • A step-type ultra-low attenuation common-mode fiber
  • A step-type ultra-low attenuation common-mode fiber
  • A step-type ultra-low attenuation common-mode fiber

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Embodiment Construction

[0052] The present invention will be described in further detail below in conjunction with embodiment.

[0053] The few-mode optical fiber of the present invention includes a core layer and a cladding layer. The radius of the core layer is r1, and the relative refractive index difference is Δn1. Outer cladding, the radius of the inner cladding is r2, the relative refractive index difference is Δn2, the radius of the sunken inner cladding is r3, the relative refractive index difference is Δn3, the radius of the auxiliary outer cladding is r4, and the relative refractive index difference is Δn4, the outer cladding radius r5 is 62.5 μm, and the outer cladding is a pure silica glass layer.

[0054] According to the technical scheme of the above-mentioned few-mode optical fiber, the parameters of the optical fiber are designed within the specified range, and the mandrel manufacturing process such as the known PCVD process, MCVD process, OVD process or VAD process is manufactured ac...

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Abstract

The invention relates to a step-type ultralow attenuation few-mode fiber. The fiber comprises a core layer and a wrapping layer. The radius r1 of the core layer is 5-8 [mu]m and the relative refractive index difference delta n1 is 0-0.20%. An inner wrapping layer, a sinking inner wrapping layer, an auxiliary outer wrapping layer and an outer wrapping layer successively wrap the core layer from theinterior to the exterior. The radius r2 of the inner wrapping layer is 8.5-14 [mu]m and the relative refractive index difference delta n2 is -0.45 - -0.23%. The radius r3 of the sinking inner wrapping layer is 14.5-30 [mu]m and the relative refractive index difference delta n3 is -0.65 - -0.40%. The radius r4 of the auxiliary outer wrapping layer is 35-50 [mu]m and the relative refractive index difference delta n4 is -0.45 - -0.23%. The outer wrapping layer is a pure silicon dioxide glass layer. According to the invention, the fiber supports two stable transmission modes and has ultralow attenuation in the 1550nm communication wave band; by properly designing the cross section of each fiber core layer of the fiber, the fiber is allowed to have quite low difference modular group time delayand excellent anti-bending performance; and the fiber has quite big effective area.

Description

technical field [0001] The invention relates to a step-type ultra-low attenuation common-mode optical fiber, which is suitable for a mode division multiplexing transmission system of optical fiber communication, and supports two stable transmission modes in the 1550nm communication band. Background technique [0002] Single-mode optical fibers are widely used in optical fiber communication networks due to their advantages such as fast transmission rate, large information carrying capacity, and long transmission distance. In recent years, with the increasing demand for capacity of communication and big data services, the network bandwidth has rapidly expanded, and the capacity of optical transmission networks is gradually approaching the Shannon limit of a single optical fiber: 100Tb / s. Space-division multiplexing and mode-division multiplexing technologies can break the traditional Shannon limit and achieve higher bandwidth transmission, which is the best way to solve the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/028G02B6/036
Inventor 周红燕吴俊王瑞春汪洪海张磊朱继红张名凯
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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