A small-core graded-index optical fiber

A technology of graded refractive index and relative refractive index difference, applied in the field of optical communication, can solve the problem that multi-mode fiber cannot adapt to high-speed network, long-distance transmission, expensive transmitting and receiving system, etc., and achieves suitable for mass production, bandwidth performance Effects of optimization, bandwidth-wavelength sensitivity reduction

Active Publication Date: 2020-09-22
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing multimode fiber cannot adapt to high-speed and long-distance transmission in the network, while single-mode fiber can meet high-speed and long-distance transmission but requires expensive transmitting and receiving systems

Method used

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  • A small-core graded-index optical fiber
  • A small-core graded-index optical fiber
  • A small-core graded-index optical fiber

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Embodiment Construction

[0035] Specific examples will be given below to further illustrate the present invention.

[0036] The optical fiber includes a core layer and a cladding layer, the refractive index profile of the core layer is parabolic, the distribution index α is 1.9 to 2.1, the radius of the core layer is R1, and the maximum relative refractive index difference Δ1max at the center of the core layer is 0.7% to 1.7%; The cladding is sequentially an inner cladding, a sunken cladding and an outer cladding from the inside to the outside, the radius of the inner cladding is R2, the relative refractive index difference of the inner cladding is Δ2, and the radius of the sunken cladding is R3, The relative refractive index difference is Δ3; the outer cladding layer is a pure silica glass layer, and the radius of the outer cladding layer is 62.5 μm.

[0037] According to the present invention, a group of prefabricated rods were prepared and drawn, and double-coated. The structure and main performanc...

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Abstract

The invention relates to an optical fiber with a small core diameter and a gradually changing refractive index. The optical fiber comprises a core layer and a coating layer, the coating layer comprises an inner coating layer, a sinking coating layer and an outer coating layer in sequence from the inside to the outside. The optical fiber is characterized in that a refractive index section of the core layer is in a parabola shape, the distribution index alpha is 1.9-2.1, the radius R1 of the core layer is 10-21 [mu]m, the central maximum relative refractive index difference delta1max of the corelayer is 0.7%-1.7%, the inner coating layer is a pure silicon dioxide layer or an F-doped silicon dioxide glass layer, the single-side width (R2-R1) is 0.5-5 [mu]m, the relative refractive index difference delta2 is -0.4% to 0%, the single-side width (R3-R2) of the sinking coating layer is 2-10 [mu]m, the relative refractive index difference delta3 is -0.8% to -0.2%, and the outer coating layer is a pure silicon dioxide glass layer. The optical fiber can be compatible with conventional OM3 / OM4 multi-mode optical fibers, the wavelength division multicomplexing technology in a wavelength rangeof 850-950 nm can be supported, the MFD of the fundamental mode LP01 of the optical fiber is matched with the single-mode optical fiber and can be compatible with the single-mode optical fiber, and single-mode transmission of 1310 nm and 1550 nm can be supported.

Description

technical field [0001] The invention relates to a small-core-diameter graded-refractive-index optical fiber, which belongs to the technical field of optical communication. Background technique [0002] Multimode fiber and VCSEL Multimode transceivers, singlemode fiber and singlemode transceivers can all be used in data centers. Among them, in emerging ultra-large data centers, the utilization rate of single-mode transmission systems is higher to meet the data center's demand for longer transmission distances. Benefiting from the lower cost and power consumption of VCSEL optical modules, the multimode transmission system still dominates the transmission within 100m. Due to intermodal dispersion, the multimode fiber has a smaller bandwidth-distance product. As data centers continue to increase their bandwidth and transmission distance requirements, the application of multimode will be further limited. [0003] Compared with single-mode transceivers, the power consumption an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/028G02B6/036
CPCG02B6/0288G02B6/036
Inventor 肖武丰王润涵黄荣王海鹰张安林杨笛王铁军
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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