CN116520480A - Groove auxiliary type microbending-resistant single-mode optical fiber - Google Patents
Groove auxiliary type microbending-resistant single-mode optical fiber Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims description 104
- 239000010410 layer Substances 0.000 claims abstract description 110
- 238000005253 cladding Methods 0.000 claims abstract description 43
- 239000012792 core layer Substances 0.000 claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 11
- 239000011737 fluorine Substances 0.000 claims abstract description 11
- 239000011247 coating layer Substances 0.000 claims description 48
- 230000007704 transition Effects 0.000 claims description 29
- 235000012239 silicon dioxide Nutrition 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 abstract description 35
- 230000003287 optical effect Effects 0.000 description 13
- 238000009826 distribution Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000000151 deposition Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- 229910003910 SiCl4 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/023—Microstructured optical fibre having different index layers arranged around the core for guiding light by reflection, i.e. 1D crystal, e.g. omniguide
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/041—Non-oxide glass compositions
- C03C13/042—Fluoride glass compositions
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
- G02B6/03627—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - +
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
The invention discloses a groove auxiliary type microbending-resistant single-mode fiber which comprises an outer cladding made of quartz glass, fluorine doped layers distributed inside and outside the outer cladding, and a core layer wrapped by the fluorine doped layers.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a groove auxiliary type microbending-resistant single-mode optical fiber.
Background
The safe and reliable underwater communication technology is an essential foundation for marine equipment application, and the optical fiber communication has the characteristics of long transmission distance, high transmission rate, high reliability and the like, can realize underwater remote high-speed communication in all sea areas, and is widely applied to the fields of underwater vehicles and the like. The remote high-capacity data transmission of the underwater vehicle can be realized by adopting the micro optical cable which is subjected to reinforcement and protection treatment, and the micro optical cable is generally composed of an optical fiber, a reinforcing layer and an outer protective layer, and the diameter of the micro optical cable is about 1 mm. In a complex deep sea environment, the micro optical cable generates random microbending under the radial compression action of deep sea pressure, the axis of the optical fiber is deformed in a micron level, part of optical power leaks from a core layer to a cladding layer, the transmission loss of a common single-mode optical fiber can be greatly increased, and when the optical fiber loss exceeds a certain value, signal transmission is terminated. The optical power leakage due to the microbending of the optical fiber will have a serious impact on the stability of the underwater communication.
At present, the G.652 optical fiber with the widest application range often cannot meet the optical fiber loss control requirement of an underwater vehicle, so that an optical fiber with a relatively small mode field diameter and a certain microbending resistance is generally adopted as a micro optical cable. There are two ways to improve the microbending resistance of the optical fiber generally, one is to optimize the coating layer of the optical fiber, the inner coating layer generally adopts a material with a lower young's modulus, which has a buffer effect on external force, and the outer coating layer adopts a material with a higher young's modulus, which has a mechanical protection effect on the optical fiber. And secondly, the waveguide structure of the quartz glass part of the optical fiber is optimized, for example, a groove auxiliary structure is adopted, the refractive index difference of the optical fiber is increased by adding a groove layer in the cladding of the optical fiber, so that the microbending resistance of the optical fiber is improved, and the method is widely applied to G.657 series bending insensitive optical fibers. In patent CN 107272111A, a low temperature bending resistant insensitive single mode fiber is described, the fiber structure includes a core layer, an inner cladding layer, a groove layer and an outer cladding layer, the core layer and the inner cladding layer are made of quartz glass co-doped with germanium and fluorine, so that the microbending resistance of the fiber can be improved, and the attenuation characteristic and stability of the fiber under the low temperature condition are improved, but the preparation process of the fiber has a certain difficulty.
From the foregoing, it can be seen that in order to further reduce the transmission loss of the optical fiber during underwater operation, it is necessary to develop a single-mode optical fiber with more excellent microbending resistance.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above and/or problems occurring in the prior art.
Therefore, the invention aims to overcome the defects in the prior art and provide a groove auxiliary type microbending-resistant single-mode optical fiber.
In order to solve the technical problems, the invention provides the following technical scheme: 1. a groove-assisted microbending-resistant single-mode optical fiber, characterized in that: the fluorine-doped core comprises an outer cladding made of quartz glass, wherein the outer cladding wraps fluorine-doped layers which are distributed inside and outside the two layers, and the fluorine-doped layers wrap the core layer.
As a preferable scheme of the trench-assisted microbending-resistant single-mode optical fiber, the present invention comprises: the wrapped fluorine-doped layer is divided into an inner layer and an outer layer, the transition layer is arranged in the wrapped fluorine-doped layer, the fluorine-doped layer which is arranged outside the wrapped transition layer is a groove layer, and the fluorine doping rate of the groove layer is larger than that of the transition layer.
As a preferable scheme of the trench-assisted microbending-resistant single-mode optical fiber, the present invention comprises: the core layer is a germanium-doped core layer.
As a preferable scheme of the trench-assisted microbending-resistant single-mode optical fiber, the present invention comprises: the resin coating layer wraps the outer wrapping layer outside the outer wrapping layer, and the resin coating layer comprises an inner coating layer and an outer coating layer.
As a preferable scheme of the trench-assisted microbending-resistant single-mode optical fiber, the present invention comprises: the Young's modulus of the inner coating layer is smaller than that of the outer coating layer.
As a preferable scheme of the trench-assisted microbending-resistant single-mode optical fiber, the present invention comprises: the radius r2 of the inner coating layer is between 90 and 95 mu m, the Young modulus is less than 3MPa, the radius r3 of the outer coating layer is between 120 and 125 mu m, and the Young modulus is between 800 and 1500 MPa.
As a preferable scheme of the trench-assisted microbending-resistant single-mode optical fiber, the present invention comprises: the radius of the core layer is between 3.6 and 3.8 mu m, and the maximum relative refractive index difference delta a is between 0.8 and 1.5 percent;
the width of the groove layer is between 3 and 6 mu m, and the relative refractive index difference delta b is between-0.5% and-0.35%;
the width of the transition layer is between 5 and 8 mu m, and the relative refractive index difference delta c is between-0.3% and-0.15%;
the outer cladding is pure silica with a radius of 62.5 μm and a refractive index of silica glass.
As a preferable scheme of the trench-assisted microbending-resistant single-mode optical fiber, the present invention comprises: the radius of the core layer is 3 μm for the trench layer width b and the relative refractive index difference Δb is-0.45%.
As a preferable scheme of the trench-assisted microbending-resistant single-mode optical fiber, the present invention comprises: the transition layer width c was 5.5 μm and the relative refractive index difference deltac was-0.3%.
The invention has the beneficial effects that:
1. the core layer has the characteristics of small core diameter and large refractive index difference, can effectively bind an optical signal in the fiber core for propagation, and can effectively prevent the optical signal in the fiber core from leaking to the cladding layer under the condition of microbending of the optical fiber, so that the microbending resistance of the optical fiber is greatly improved;
2. the groove layer and the transition layer of the optical fiber are doped with fluorine, and better microbending performance is realized by reasonably configuring the widths and the depths of the groove layer and the transition layer;
3. the thickness and Young modulus of the inner coating layer and the outer coating layer with lower Young modulus and the outer coating layer with higher Young modulus are reasonably arranged, so that the mechanical strength of the optical fiber is enhanced, and the deformation of the glass part of the optical fiber under the action of external force is reduced;
4. the optical fiber can keep excellent microbending performance and lower attenuation level in a severe use environment, meets the requirements of underwater optical communication, and has the characteristics of simple structure and easy preparation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic cross-sectional view of a glass portion of an optical fiber produced in examples 2, 4, and 5 of the present invention. Wherein: 1-core layer, 2-groove layer, 3-transition layer and 4-outer cladding layer;
FIG. 2 is a schematic view showing refractive index distribution of the optical fiber glass portions produced in examples 2, 4 and 5 of the present invention.
Wherein: a radius of the a-core, a relative refractive index difference between the a-core and the outer cladding, a width of the b-trench, a relative refractive index difference between the a-trench and the outer cladding, a width of the c-transition, a relative refractive index difference between the a-transition and the outer cladding;
FIG. 3 is a schematic cross-sectional view of the whole optical fiber produced in examples 2, 4, 5 of the present invention. Wherein r1 is the radius of the glass part of the optical fiber, r2 is the radius of the inner coating layer, and r3 is the radius of the outer coating layer;
FIG. 4 is a schematic representation of the refractive index profile of commercial fibers SMF-28e, G.657A1, G.657A2 and G.657B3;
FIG. 5 shows microbending loss test results of commercial fibers SMF-28e, G.657A1, G.657A2, G.657B3 and fibers of the present invention under a weight of 1-6 kg;
FIG. 6 is a refractive index profile of an optical fiber prepared in example 2 of the present invention;
FIG. 7 is the maximum deformation of the axis of the optical fiber under the action of a weight of 1 to 6kg for a common single mode fiber and the optical fiber prepared in example 2;
FIG. 8 is a pattern field distribution diagram of a common single mode fiber under the action of a 6kg weight;
FIG. 9 is a pattern field distribution diagram of the optical fiber prepared in example 2 under the action of a weight of 6 kg;
FIG. 10 shows microbending loss of an example fiber under different trench layer and transition layer configuration parameters;
FIG. 11 is a physical view of the optical fiber produced in example 2;
FIG. 12 is a cross-sectional view of an optical fiber obtained by amplifying the optical fiber obtained in example 2 under a microscope by 50 times.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
In this embodiment, as shown in fig. 1, the trench auxiliary structure effectively binds light in the fiber core, and has a good effect of binding light in the case of microbending, and the final product prepared in this embodiment and the following embodiments has excellent microbending resistance.
As shown in fig. 1, the trench-assisted microbending resistant single mode fiber includes the following distribution from inside to outside: the core layer (1), the groove layer (2), the transition layer (3) and the outer cladding layer (4). A coating layer (5) wrapping the outer wrapping layer (4) is arranged outside the outer wrapping layer (4), wherein the coating layer (5) comprises an inner coating layer (5-1) and an outer coating layer (5-2), and the Young modulus of the inner coating layer (5-1) is smaller than that of the outer coating layer (5-2).
Further describing the structure of the trench-assisted microbending-resistant single-mode fiber with reference to fig. 2, the layer close to the axis is the fiber core layer, the trench layer (2) is close to the core layer (1), the transition layer (3) is close to the trench layer (2), and the outermost layer is the outer cladding layer (4). The method is characterized in that the radius of the core layer (1) is between 3.6 and 3.8 mu m, and the maximum relative refractive index difference delta a is between 0.8 and 1.5 percent; the width of the groove layer (2) is 3-6 mu m, and the relative refractive index difference delta b is-0.5% -0.35%; the width of the transition layer (3) is between 5 and 8 mu m, and the relative refractive index difference delta c is between-0.3% and-0.15%; the outer cladding (4) is pure silicon dioxide. The optical fiber core layer (1) is a germanium-doped silica glass layer, and the groove layer (2) and the transition layer (3) are fluorine-doped silica glass layers. The relative index difference is the index difference of the portions of the fiber relative to the outer cladding of pure silica.
The size of each layer of the groove auxiliary type microbending-resistant single-mode optical fiber is as follows: referring to FIG. 3, FIG. 3 is a schematic cross-sectional view of the entire optical fiber of the present invention, wherein r1 is the radius of the silica glass portion of the optical fiber, i.e., the outer cladding (4), r2 is the radius of the inner coating layer (5-1), and r3 is the radius of the outer coating layer (5-2). It is characterized in that the radius r1 of the outer cladding layer (4) is 62.5 mu m, the radius r2 of the inner coating layer (5-1) is between 90 and 95 mu m, the Young modulus is less than 3MPa, the radius r3 of the outer coating layer (5-2) is between 120 and 125 mu m, and the Young modulus is between 800 and 1500 MPa.
Example 2
The present embodiment is used to illustrate the preparation process and method of the trench-assisted microbending-resistant single-mode optical fiber:
the optical fibers were prepared using a Modified Chemical Vapor Deposition (MCVD). A high purity fused silica tube was selected as the base tube, the diameter of the tube being 18 mm and the wall thickness being 1.2 mm. First, a fluorine doped layer was deposited using O2, freon and SiCl4 as starting reactants, and the concentration of fluorine doped was controlled by varying the flow rate of Freon to form a transition layer and a trench layer having a lower refractive index. Then use O 2 、GeCl 4 And SiCl 4 And depositing a germanium-doped layer to form a core layer with a higher refractive index. The deposition temperature is 1650 ℃ or so, and after deposition, the optical fiber preform is sintered into a transparent optical fiber preform. Finally, the preform is arranged on a drawing tower, drawing is completed at a high temperature of about 1850 ℃, and two resin coating layers with different hardness are respectively coated outside the bare optical fiber in the drawing process. The physical and cross-sectional views of the optical fiber are shown in fig. 11 and 12, respectively.
The outer cladding (4) of the microbending-resistant single-mode fiber is made of pure fiber quartz glass, and the outer side of the interface of the outer cladding comprises two resin coating layers: the inner coating layer (5-1) and the outer coating layer (5-2) are sequentially a core layer (1), a groove layer (2), a transition layer (3) and an outer cladding layer (4) from inside to outside, and the core layer (1), the groove layer (2), the transition layer (3) and the outer cladding layer (4) are made of quartz glass. The actual refractive index profile of the example fiber is shown in FIG. 6, with a core radius a of 3.7 μm and a relative refractive index difference Δa of 1.47%; the trench layer width b is 3 μm, and the relative refractive index difference Δb is-0.45%; the transition layer width c is 5.5 μm, and the relative refractive index difference deltac is-0.3%; the outer cladding is pure silicon dioxide, and the radius r1 is 62.5 mu m; the radius r2 of the inner coating layer is 90 mu m, and the Young modulus is 1.1MPa; the radius r3 of the outer coating layer was 122.5. Mu.m, and the Young's modulus was 900MPa.
Microbending additional loss test method referring to method C metal mesh plate method in IEC 62221-2012, the length of the test optical fiber is 3m, 20 mesh metal mesh is adopted, and the contact length of the optical fiber and the metal mesh is 300mm. In the test process, weights with the mass of 1kg are sequentially placed on the flat plate to slightly bend the optical fiber, weights with the mass of 6kg are placed in total, and the test wavelength is 1550nm.
Example 3
Microbending losses of the optical fibers prepared in example 2 were tested separately from the normal single mode optical fiber (SMF-28 e) and the three bend insensitive single mode optical fibers (G.657A1, G.657A2, G.657B3). FIG. 4 is a schematic view of refractive index distribution of SMF-28e, G.657A1, G.657A2 and G.657B3 optical fibers, and Table 1 shows structural parameters of the four optical fibers, it can be seen that SMF-28e, G.657A1 and G.657A2 are double-clad optical fibers, the cladding is a fluorine-doped groove layer and an outer cladding layer in sequence from inside to outside, the G.657B3 is a three-clad optical fiber, and the cladding is a light fluorine-doped inner cladding layer, a deep fluorine-doped groove layer and an outer cladding layer in sequence from inside to outside. The specific structural parameters of the optical fibers are shown in table 1.
TABLE 1 structural parameters of commercial fibers SMF-28e, G.657A1, G.657A2 and G.657B3
TABLE 1
| Structural parameters | SMF-28e | G.657A1 | G.657A2 | G.657B3 |
| Δ a (％) | 0.42 | 0.47 | 0.5 | 0.55 |
| Δ b (％) | -0.007 | -0.085 | -0.1 | -0.03 |
| Δ c (％) | 0 | 0 | 0 | -0.68 |
| a(μm) | 4.5 | 4.1 | 4.1 | 4 |
| b(μm) | 11 | 13 | 13.5 | 5 |
| c(μm) | 0 | 0 | 0 | 6 |
Fig. 5 shows microbending loss test results, and it can be seen that the microbending loss of the five optical fibers all showed an approximately linear increasing trend with increasing weight mass, wherein the increase of the microbending loss of SMF-28e is greatest, and then g.657a1, g.657a2, g.657b3 and the example optical fibers respectively. Under the same weight mass, the microbending losses of SMF-28e, G.657A1, G.657A2, G3657B3 and the example optical fiber are sequentially reduced, for example, when the weight mass is 6kg, the microbending losses of the five optical fibers are 1.306dB/m, 0.425dB/m, 0.2096dB/m, 0.15dB/m and 0.0052dB/m respectively. It can be seen that the embodiment optical fiber has the advantages of low microbending loss and low microbending sensitivity.
The reason why the optical fiber produced in example 2 was able to reduce microbending loss is presumed to be: simulation analysis is carried out from two aspects of optical fiber deformation and mode field distribution respectively. Under the combined action of the metal net and the weight, the optical fiber is subjected to uneven pressure on the side surface, the axis of the optical fiber is periodically deformed in a micron level, and the maximum deformation exists at the contact position of the metal net and the optical fiber. Fig. 7 is a graph of simulation results of maximum deformation of the common single-mode fiber and the embodiment optical fiber at the axis, wherein the deformation of the common single-mode fiber and the embodiment optical fiber is in a linear increasing trend along with the increase of weight mass, and the maximum deformation of the embodiment optical fiber is reduced by about 58% compared with the common single-mode fiber under the action of the same weight mass, because the embodiment optical fiber adopts the microbending-resistant coating material, the Young modulus of the inner coating layer is lower, the buffer effect is realized on external force, and the deformation of the optical fiber caused by external force is reduced. Fig. 8 and fig. 9 are respectively mode field distributions of a common single-mode fiber and an embodiment fiber under the action of a weight of 6kg, and due to micro deformation of the fiber, part of optical power in a fiber core of the common single-mode fiber leaks into a cladding, while the embodiment fiber can well bind light in the fiber core, so that the leakage of the optical power is reduced, and the microbending performance is improved. In addition, we calculate the microbending loss of the optical fiber under different structural parameters of the groove layer and the transition layer, as shown in fig. 10, the microbending loss of the optical fiber decreases with the increase of the width of the inner groove, then tends to a stable value, the microbending loss gradually increases with the increase of the refractive index difference of the inner groove, and the expansion of the groove volume can obviously improve the microbending performance of the optical fiber, but because of the limitation of fluorine doping technology, it is difficult to prepare wide and deep grooves, so that one transition layer is added to further reduce the microbending loss of the optical fiber and reduce the preparation difficulty.
Example 4
The present embodiment is different from embodiment 2 in that the fluorine doping ratio of the trench layer and the transition layer is different. The outer cladding (4) of the microbending-resistant single-mode fiber is made of pure fiber quartz glass, and the outer side of the interface of the outer cladding comprises two resin coating layers: the inner coating layer (5-1) and the outer coating layer (5-2) are sequentially a core layer (1), a groove layer (2), a transition layer (3) and an outer cladding layer (4) from inside to outside, and the core layer (1), the groove layer (2), the transition layer (3) and the outer cladding layer (4) are made of quartz glass. The radius a of the optical fiber core layer of the embodiment is 3.7 mu m, and the relative refractive index difference delta a is 1.47%; the trench layer width b is 3 μm, and the relative refractive index difference Δb is-0.33%; the transition layer width c is 5.5 μm, and the relative refractive index difference deltac is-0.16%; the outer cladding is pure silicon dioxide, and the radius r1 is 62.5 mu m; the radius r2 of the inner coating layer is 90 mu m, and the Young modulus is 1.1MPa; the radius r3 of the outer coating layer was 122.5. Mu.m, and the Young's modulus was 900MPa. When the weight mass was 6kg, the microbending loss of the optical fiber was 0.031dB/m.
Example 5
The present embodiment is different from embodiment 2 in that the fluorine doping ratio of the trench layer and the transition layer is different. The radius a of the optical fiber core layer of the embodiment is 3.7 mu m, and the relative refractive index difference delta a is 1.47%; the trench layer width b is 3 μm, and the relative refractive index difference Δb is-0.26%; the transition layer width c is 5.5 μm and the relative refractive index difference deltac is-0.19%; the outer cladding is pure silicon dioxide, and the radius r1 is 62.5 mu m; the radius r2 of the inner coating layer is 90 mu m, and the Young modulus is 1.1MPa; the radius r3 of the outer coating layer was 122.5. Mu.m, and the Young's modulus was 900MPa. When the weight mass is 6kg, the microbending loss of the optical fiber is 0.076dB/m.
The optical fibers prepared according to example 2 and examples 4 and 5 have the advantages of excellent microbending resistance, and the optical fibers prepared based on the multilayer structure of my invention have the advantages and the technical effects of not having the intention of the conventional technical solutions in the field, and the corresponding parameters used in example 2 have the advantages of excellent microbending resistance.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (9)
1. A groove-assisted microbending-resistant single-mode optical fiber, characterized in that: the fluorine-doped core comprises an outer cladding made of quartz glass, wherein the outer cladding wraps fluorine-doped layers which are distributed inside and outside the two layers, and the fluorine-doped layers wrap the core layer.
2. The groove-assisted microbending resistant single mode optical fiber of claim 1, wherein: the wrapped fluorine-doped layer is divided into an inner layer and an outer layer, the transition layer is arranged in the wrapped fluorine-doped layer, the fluorine-doped layer which is arranged outside the wrapped transition layer is a groove layer, and the fluorine doping rate of the groove layer is larger than that of the transition layer.
3. The groove-assisted microbending resistant single mode optical fiber of claim 1, wherein: the core layer is a germanium-doped core layer.
4. The groove-assisted microbending resistant single mode optical fiber of claim 1, wherein: the resin coating layer wraps the outer wrapping layer outside the outer wrapping layer, and the resin coating layer comprises an inner coating layer and an outer coating layer.
5. The groove-assisted microbending resistant single mode optical fiber of claim 4 wherein: the Young's modulus of the inner coating layer is smaller than that of the outer coating layer.
6. The groove-assisted microbending resistant single mode optical fiber of claim 4 or 5, wherein: the radius r2 of the inner coating layer is between 90 and 95 mu m, the Young modulus is less than 3MPa, the radius r3 of the outer coating layer is between 120 and 125 mu m, and the Young modulus is between 800 and 1500 MPa.
7. The groove-assisted microbending resistant single mode optical fiber of claim 2, wherein: the radius of the core layer is between 3.6 and 3.8 mu m, and the maximum relative refractive index difference delta a is between 0.8 and 1.5 percent;
the width of the groove layer is between 3 and 6 mu m, and the relative refractive index difference delta b is between-0.5% and-0.35%;
the width of the transition layer is between 5 and 8 mu m, and the relative refractive index difference delta c is between-0.3% and-0.15%;
the outer cladding is pure silicon dioxide, the radius of the outer cladding is 62.5 mu m, and the refractive index of the outer cladding is that of silicon dioxide glass.
8. The groove-assisted microbending resistant single mode optical fiber of claim 2 or 7, wherein: the radius of the core layer is 3 mu m of the width b of the groove layer, and the relative refractive index difference delta b is-0.45%.
9. The groove-assisted microbending resistant single mode optical fiber of claim 2 or 7, wherein: the transition layer width c is 5.5 μm and the relative refractive index difference deltac is-0.3%.
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| CN202310289320.2A CN116520480A (en) | 2023-03-22 | 2023-03-22 | Groove auxiliary type microbending-resistant single-mode optical fiber |
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| CN202310289320.2A CN116520480A (en) | 2023-03-22 | 2023-03-22 | Groove auxiliary type microbending-resistant single-mode optical fiber |
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| CN202310289320.2A Pending CN116520480A (en) | 2023-03-22 | 2023-03-22 | Groove auxiliary type microbending-resistant single-mode optical fiber |
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| CN (1) | CN116520480A (en) |
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