CN216248394U - Fully-synthetic low-loss single-mode optical fiber - Google Patents
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Abstract
The utility model discloses a fully-synthetic low-loss single-mode optical fiber which comprises a fiber core layer, a first inner cladding layer, a second inner cladding layer and an outer cladding layer from inside to outside; the fiber core layer is a quartz glass layer doped with germanium element, and the refractive index difference delta n1 of the fiber core layer relative to pure quartz glass is 0.300-0.340%; the first inner cladding and the second inner cladding are quartz glass layers doped with fluorine elements; the refractive index difference Delta n2 of the first inner cladding relative to the pure quartz glass is-0.04% -0.02%; the refractive index difference Delta n3 of the second inner cladding relative to the pure quartz glass is-0.07% -0.04%; the outer cladding is a micro-doped aluminum quartz cladding, and the refractive index difference delta n4 of the outer cladding relative to pure quartz glass satisfies delta n1> delta n4> delta n2> delta n 3. The attenuation coefficient of the optical fiber at 1550nm waveband is less than or equal to 0.180db/km, the purpose of low-loss attenuation is achieved, and the manufacturing cost and the process difficulty are low.
Description
Technical Field
The utility model belongs to the technical field of communication optical fibers, and particularly relates to a fully-synthesized low-loss single-mode optical fiber.
Background
With the rapid development of optical fiber communication technology, the conventional single-mode g.652 optical fiber cannot meet the requirement of trunk transmission with long distance, high speed and large capacity of 400G. The low-attenuation coefficient optical fiber can effectively improve the optical signal-to-noise ratio in the optical fiber communication process, improve the system transmission distance to reduce the relay station arrangement and reduce the operation cost, so that the low-loss single-mode optical fiber becomes a popular research for various large optical fiber enterprises.
Patent CN1692086A discloses that the optical fiber attenuation is reduced by doping the core with alkali metal oxide, but the simple use of alkali metal leads to increased hydrogen loss, which is not favorable for the long-term stable operation of the optical fiber, and the patent does not describe the attenuation level corresponding to the specific embodiment.
The patent CN103472529A discloses a low-loss optical fiber preparation method, the prepared optical fiber section comprises a core layer (pure silicon core micro-doped with fluorine or boron), a core cladding transition layer, a core cladding interface transition layer, a deep-doped fluorine cladding layer, a sheath transition layer, a sheath interface transition layer and a sleeve layer from inside to outside in sequence, and the attenuation coefficient of the manufactured optical fiber at 1550nm waveband can be less than 0.158 db/km; however, the core layer main body is a pure silicon core, the viscosity is high, the cladding layer adopts a deep fluorine-doped design, the viscosity is low, and the viscosity matching imbalance of the optical fiber is easily caused, so that the virtual temperature of the core layer is rapidly increased, and the attenuation loss is easily caused to be large; although the transition layer and the interface transition layer are designed between the core cladding layers to avoid the defect, the section design is complex, and the deposition is carried out by an in-tube method, so that the dehydration is difficult, the process difficulty for preparing the low-loss core rod is high, and the large-scale production is not facilitated.
The patent CN206573738U discloses a method for preparing a low-loss optical fiber, wherein the optical fiber comprises a core layer, an inner cladding layer, an intermediate isolation layer and an outer cladding layer, the attenuation coefficient of the 1550nm waveband of the obtained low-loss optical fiber is less than or equal to 0.185db/km, and the typical value is 0.180db/km, which is superior to that of the conventional G.652 optical fiber; however, the technology uses a high-purity quartz sleeve, so that the economic cost is high.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problems, an object of the present invention is to provide a fully-synthesized low-loss single-mode optical fiber, wherein the attenuation coefficient of the optical fiber in the 1550nm band is less than or equal to 0.180db/km, so as to achieve the purpose of low-loss attenuation, and the optical fiber has low manufacturing cost and low manufacturing process difficulty.
In order to achieve the technical purpose and achieve the technical effect, the utility model is realized by the following technical scheme:
a fully-synthetic low-loss single-mode optical fiber comprises a core layer, a first inner cladding layer, a second inner cladding layer and an outer cladding layer from inside to outside;
the fiber core layer is a germanium element-doped quartz glass layer, the radius R1 of the fiber core layer is 4-5 mu m, and the refractive index difference delta n1 of the fiber core layer relative to pure quartz glass is 0.300% -0.340%;
the first inner cladding and the second inner cladding are both quartz glass layers doped with fluorine elements; the radius R2 of the first inner cladding is 11.5-16.5 mu m, and the refractive index difference delta n2 of the first inner cladding relative to the pure quartz glass is-0.04% -0.02%; the radius R3 of the second inner cladding is 20-25 μm, and the refractive index difference delta n3 of the second inner cladding relative to the pure quartz glass is-0.07% -0.04%;
the outer cladding layer is a micro-doped aluminum-quartz cladding layer, the radius R4 of the outer cladding layer is 62.5 +/-0.5 mu m, and the refractive index difference delta n4 of the outer cladding layer relative to pure quartz glass meets delta n 1-delta n 4-delta n 2-delta n 3.
Furthermore, the core layer, the first inner cladding layer and the second inner cladding layer form a quartz core rod, and the core layer, the first inner cladding layer and the second inner cladding layer are obtained by one-step deposition through a vapor axial deposition method.
Further, the outer cladding layer is prepared by adopting an outer vapor deposition method.
Furthermore, the doping concentration of aluminum in the outer cladding layer is 2-15 ppm.
Further, the optical fiber has an attenuation coefficient at a 1550nm band less than or equal to 0.180 db/km.
The utility model has the beneficial effects that:
the fiber core layer is doped with germanium element, the first inner cladding layer and the second inner cladding layer are doped with fluorine element, the outer cladding layer is doped with aluminum slightly, doped components of all layers are less, and the process preparation difficulty is low; in addition, the outer cladding layer is doped with aluminum element, so that the viscosity of glass can be reduced, the adjustment of a glass network structure is facilitated, stress can be concentrated on the cladding layer in the drawing process, the stress of a core layer is less, the internal defects of the optical fiber are reduced, the relaxation time of the glass structure can be obviously reduced in the annealing process of the optical fiber, and the density of the glass tends to be uniform, so that the virtual temperature of the optical fiber is integrally reduced, and the rayleigh scattering loss of the optical fiber caused by density fluctuation factors is facilitated to be reduced; in addition, the first inner cladding and the second inner cladding are doped with fluorine, so that the refractive index can be effectively reduced, and the first inner cladding and the second inner cladding are subjected to viscosity matching with the core layer and the outer cladding, so that the overall performance is more reliable and is not easily influenced by other external conditions such as temperature and the like;
the utility model adopts the stepped sunken cladding design of the first inner cladding and the second inner cladding, can effectively inhibit the leakage of a fundamental mode, and simultaneously, fluorine doping can effectively concentrate the optical power on the core layer, reduce the loss of the optical fiber and improve the bending resistance;
in addition, the core layer, the first inner cladding layer and the second inner cladding layer in the optical fiber are formed by one-step deposition through a vapor axial deposition method (VAD), compared with the method that a high-cost deep fluorine-doped sleeve is adopted as the inner cladding layer or a method that an in-tube method (PCVD + MCVD) is adopted for deposition in the prior art, the method has the advantages of simple process path, obvious cost advantage and benefit for large-scale production.
Drawings
Fig. 1 is a schematic radial cross-sectional structure diagram of a fully-synthetic low-loss single-mode optical fiber according to an embodiment of the present invention.
Fig. 2 is a refractive index profile structure distribution diagram of a fully-synthetic low-loss single-mode optical fiber according to an embodiment of the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Fig. 1 shows a preferred embodiment of a fully-synthetic low-loss single-mode optical fiber, which comprises, from inside to outside, a core layer 1, a first inner cladding layer 2, a second inner cladding layer 3 and an outer cladding layer 4;
as shown in fig. 2, the core layer 1 is a germanium-doped quartz glass layer and is formed by one-step deposition through a Vapor Axial Deposition (VAD); the radius R1 of the core layer is 4.3 μm, and the refractive index difference Deltan 1 of the core layer relative to pure quartz glass is 0.310%;
as shown in fig. 2, the first inner cladding layer 2 and the second inner cladding layer 3 are both quartz glass layers doped with fluorine; the radius R2 of the first inner cladding is 13.5 μm, and the refractive index difference Deltan 2 of the first inner cladding relative to pure quartz glass is-0.02%; the radius R3 of the second inner cladding is 22.1 μm, and the refractive index difference Deltan 3 of the second inner cladding relative to pure quartz glass is-0.05%;
as shown in fig. 2, the outer cladding 4 is a lightly doped aluminum quartz cladding obtained by Outside Vapor Deposition (OVD) with an aluminum doping concentration of 10 ppm; the radius R4 of the outer cladding is 62.4 μm, and the refractive index difference Deltan 4 of the outer cladding relative to pure quartz glass satisfies Deltan 1> Deltan 4> Deltan 2> Deltan 3.
Aiming at the low-loss optical fiber, PK2200 is used for testing and confirming optical parameters of the optical fiber, OTDR is used for measuring the attenuation of the optical fiber, the optical parameters of the prepared optical fiber, such as cut-off wavelength, mode field diameter and the like, meet the requirements of ITU-T G.652D standard, and the attenuation loss performance is obviously superior to that of a conventional G.652D product; the attenuation coefficient of the low loss optical fiber at 1550nm band is less than or equal to 0.180db/km, with a typical value of 0.175 db/km.
Comparative example
The optical fiber structure of the comparative example includes a core layer, an inner cladding layer, and a pure silica outer cladding layer; specifically, a core layer and an inner cladding layer are deposited by a Vapor Axial Deposition (VAD) method; the core layer is doped with germanium, the radius is 4.4 mu m, and the refractive index difference relative to pure quartz glass is 0.325 percent; the inner cladding is doped with fluorine, the radius is 22.1 mu m, and the refractive index difference relative to the pure quartz glass is-0.05 percent; a pure silica outer cladding was deposited by Outside Vapor Deposition (OVD) with a radius of 62.5 μm and a refractive index difference of 0% with respect to pure quartz glass.
Aiming at the optical fiber, PK2200 is used for testing and confirming optical parameters of the optical fiber, OTDR is used for measuring the attenuation of the optical fiber, and the optical parameters of the prepared optical fiber, such as cut-off wavelength, mode field diameter and the like, all meet the requirements of ITU-T G.652D standard; the above-mentioned optical fiber of the comparative example has an attenuation coefficient of 0.190db/km or less in the 1550nm band, with a typical value of 0.185 db/km.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A fully-synthetic low-loss single-mode optical fiber, comprising: the optical fiber structure comprises a core layer, a first inner cladding layer, a second inner cladding layer and an outer cladding layer from inside to outside;
the fiber core layer is a germanium element-doped quartz glass layer, the radius R1 of the fiber core layer is 4-5 mu m, and the refractive index difference delta n1 of the fiber core layer relative to pure quartz glass is 0.300% -0.340%;
the first inner cladding and the second inner cladding are both quartz glass layers doped with fluorine elements; the radius R2 of the first inner cladding is 11.5-16.5 mu m, and the refractive index difference delta n2 of the first inner cladding relative to the pure quartz glass is-0.04% -0.02%; the radius R3 of the second inner cladding is 20-25 μm, and the refractive index difference delta n3 of the second inner cladding relative to the pure quartz glass is-0.07% -0.04%;
the outer cladding layer is a micro-doped aluminum-quartz cladding layer, the radius R4 of the outer cladding layer is 62.5 +/-0.5 mu m, and the refractive index difference delta n4 of the outer cladding layer relative to pure quartz glass meets delta n 1-delta n 4-delta n 2-delta n 3.
2. The fully synthetic low loss single mode optical fiber of claim 1, wherein: the fiber core layer, the first inner cladding layer and the second inner cladding layer form a quartz core rod, and the fiber core layer, the first inner cladding layer and the second inner cladding layer are obtained through one-step deposition by adopting a vapor axial deposition method.
3. The fully synthetic low loss single mode optical fiber of claim 1, wherein: the outer cladding layer is prepared by an external vapor deposition method.
4. The fully synthetic low loss single mode optical fiber of claim 1, wherein: the attenuation coefficient of the optical fiber at a 1550nm band is less than or equal to 0.180 db/km.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112230331A (en) * | 2020-11-11 | 2021-01-15 | 江苏亨通光导新材料有限公司 | Fully-synthetic low-loss single-mode optical fiber |
| CN115047559A (en) * | 2022-06-15 | 2022-09-13 | 烽火通信科技股份有限公司 | Multiband attenuation flat optical fiber |
| CN115437060A (en) * | 2022-09-05 | 2022-12-06 | 江苏亨通光导新材料有限公司 | Low-loss bending-resistant single-mode optical fiber and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112230331A (en) * | 2020-11-11 | 2021-01-15 | 江苏亨通光导新材料有限公司 | Fully-synthetic low-loss single-mode optical fiber |
| CN115047559A (en) * | 2022-06-15 | 2022-09-13 | 烽火通信科技股份有限公司 | Multiband attenuation flat optical fiber |
| CN115047559B (en) * | 2022-06-15 | 2023-04-21 | 烽火通信科技股份有限公司 | Multiband attenuation flat optical fiber |
| CN115437060A (en) * | 2022-09-05 | 2022-12-06 | 江苏亨通光导新材料有限公司 | Low-loss bending-resistant single-mode optical fiber and preparation method thereof |
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