Optical fiber and preparation method thereof
阅读说明：本技术 一种光纤及其制备方法 (Optical fiber and preparation method thereof ) 是由 覃施敏 吴桐 于 2021-09-28 设计创作，主要内容包括：本申请涉及光纤技术领域,具体涉及一种光纤及其制备方法。从内到外,所述光纤包括纤芯、包层和涂覆层,其特征在于,所述纤芯的直径不高于5微米,所述涂覆层的外直径不高于70微米；所述包层采用锗掺杂的硅层；所述涂覆层采用含有紫外光固化涂料的硅橡胶。本申请提供的光纤,在同样大小的管道内,可增大光纤数,显著提高信号传输效率,在降低单芯光纤直径的同时提高抗弯曲性能和耐磨性。(The application relates to the technical field of optical fibers, in particular to an optical fiber and a preparation method thereof. From inside to outside, the optical fiber comprises a fiber core, a cladding and a coating layer, and is characterized in that the diameter of the fiber core is not higher than 5 microns, and the outer diameter of the coating layer is not higher than 70 microns; the cladding layer is a germanium-doped silicon layer; the coating layer is made of silicon rubber containing ultraviolet curing coating. The application provides an optic fibre, in the pipeline of equidimension, can increase the optic fibre number, show improvement signal transmission efficiency, improve bending resistance and wearability when reducing single core fiber diameter.)
1. An optical fiber comprising, from the inside out, a core, a cladding and a coating, characterized in that the core has a diameter not higher than 5 microns and the coating has an outer diameter not higher than 70 microns; the cladding layer is a germanium-doped silicon layer; the coating layer is made of silicon rubber; the silicon rubber is methyl vinyl phenyl silicon rubber with the atomic ratio of phenyl to silicon of 5-10 mol%.
2. An optical fiber according to claim 1, wherein the surface of said silicone rubber contains a uv curable coating.
3. The optical fiber of claim 2, wherein the uv curable coating is prepared from epoxy acrylate, urethane acrylate, hydroxy acrylate resin, photoinitiator, auxiliary agent, and solvent; the mass ratio of the epoxy acrylate to the urethane acrylate to the hydroxyl acrylate resin to the photoinitiator to the auxiliary agent to the solvent is 1: (1.5-2.5): (2.5-3.5): (0.06-0.08): (0.003-0.004): (5-8).
4. An optical fiber according to claim 3, wherein said urethane acrylate is a mixture of a hexafunctional aliphatic urethane acrylate and an aliphatic urethane acrylate containing NCO groups; the mass ratio of the hexafunctional aliphatic polyurethane acrylate to the aliphatic polyurethane acrylate containing NCO groups is (5-7): 1.
5. an optical fiber according to claim 3, wherein said epoxy acrylate is bisphenol A epoxy acrylate.
6. A method of manufacturing an optical fiber according to any of claims 1 to 5, comprising the steps of:
depositing silicon by adopting a first blowtorch to form a fiber core;
depositing silicon and germanium on the surface of the fiber core by adopting a second torch to form a cladding;
placing the fiber preform in chlorine gas for dehydroxylation treatment, then performing an annealing process, and performing sintering treatment to obtain an optical fiber preform;
and carrying out wire drawing treatment, secondary heating annealing treatment, cooling, coating silicon rubber, ultraviolet curing treatment and take-up on the optical fiber preform to obtain the optical fiber.
7. The method as claimed in claim 6, wherein the flame temperature of the first torch is 800-.
8. The method of claim 6, wherein SiCl is introduced into the second torch4Gas, GeCl4Gas, oxygen, hydrogen, argon; the SiCl4Gas, GeCl4The flow rates of the gas, the oxygen, the hydrogen and the argon are respectively 8-12mL/min, 10-20 muL/min, 60mL/min, 6mL/min and 150 mL/min.
9. The method as claimed in claim 6, wherein the drawing temperature of the drawing process is 2200 ℃ and 2300 ℃, and the drawing speed is 4000 ℃ and 5000 m/min.
Technical Field
The application relates to the technical field of optical fibers, in particular to an optical fiber and a preparation method thereof.
Background
An optical fiber, referred to as an optical fiber for short, is a light conduction means for conducting light by total reflection of light in a fiber made of glass or plastic. Compared with the electric conduction at the electric wire, the light conduction loss at the optical fiber is low and the frequency band is wide. Optical fibers are widely used as signal transmission media for long distances.
At present, the outer diameter of an optical fiber for communication is generally between 125 micrometers and 140 micrometers, the inner diameter of the optical fiber is 9 micrometers, the volume of the optical fiber is large, the number of single-core optical fibers placed in a pipeline is small, and the transmission speed is slow. When the size of the optical fiber is reduced, especially when the inner diameter of the optical fiber is reduced to 5 micrometers or less, the fragility and poor bending resistance of the optical fiber are aggravated, the optical fiber is easy to break when bent at a small angle, and signal loss and transmission interruption are easily caused.
In view of the above-mentioned related arts, the applicant believes that it is necessary to develop a method for manufacturing an optical fiber that can reduce the diameter of a single core optical fiber and improve bending resistance.
Disclosure of Invention
The application provides an optical fiber and a preparation method thereof, aiming at reducing the diameter of a single-core optical fiber and improving the bending resistance of the optical fiber.
In a first aspect, the present application provides an optical fiber, which is implemented by using the following technical scheme:
an optical fiber comprising, from inside to outside, a core, a cladding and a coating, the core having a diameter no greater than 5 microns and the coating having an outer diameter no greater than 70 microns; the cladding layer is a germanium-doped silicon layer; the coating layer is made of silicon rubber; the silicon rubber is methyl vinyl phenyl silicon rubber with the atomic ratio of phenyl to silicon of 5-10 mol%.
Through adopting above-mentioned technical scheme, this application adopts the fibre core that the diameter is not higher than 5 microns, the optical fiber of the coating that the external diameter is not higher than 70 microns, in the pipeline of the same size, can increase the optic fibre number, is showing and is improving signal transmission efficiency, is equipped with germanium-doped silicon layer and methyl vinyl phenyl silicon rubber's effect outside the fibre core simultaneously, can realize improving anti bending property when reducing single core optical fiber diameter. The applicant guesses that the germanium-doped silicon layer can improve the refractive index of the optical fiber and reduce the loss of the optical fiber during bending probably due to high germanium carrier concentration and high electron hole mobility; silicon and oxygen atoms in the silicon rubber alternately form a main chain, so that the silicon rubber has excellent elasticity and weather resistance and can improve the bending resistance of the optical fiber. In addition, methyl vinyl phenyl silicone rubber with the atomic ratio of phenyl to silicon of 5-10mol% is adopted, the regularity is low, the acting force among polymer molecules is changed by introducing a certain amount of phenyl, the hardness of a coating layer is improved, and the protection of silicone rubber to a cladding layer is favorably improved.
Preferably, the surface of the silicone rubber contains a uv curable coating.
By adopting the technical scheme, the applicant finds that the coating layer is easy to abrade in the subsequent coupling process by adopting the methylvinyl phenyl silicone rubber with the silicon atomic ratio of 5-10mol% as the coating layer in research. And the ultraviolet curing coating is coated on the surface of the methyl vinyl phenyl silicone rubber, so that the wear resistance can be improved, and the bending resistance of a coating layer to an optical fiber can be improved.
Preferably, the raw materials for preparing the ultraviolet curing coating comprise epoxy acrylate, polyurethane acrylate, hydroxyl acrylate resin, a photoinitiator, an auxiliary agent and a solvent; the mass ratio of the epoxy acrylate to the urethane acrylate to the hydroxyl acrylate resin to the photoinitiator to the auxiliary agent to the solvent is 1: (1.5-2.5): (2.5-3.5): (0.06-0.08): (0.003-0.004): (5-8).
By adopting the technical scheme, the acrylic resin coating prepared from the epoxy acrylate, the urethane acrylate and the hydroxyl acrylate resin is adopted, the methyl vinyl phenyl silicone rubber is protected, and the wear resistance and the adhesive force of the coating layer are improved. Particularly, the tensile strength of the ultraviolet curing coating can be adjusted by controlling the mass ratio of the epoxy acrylate, the urethane acrylate and the hydroxyl acrylate resin, and the bending resistance of the optical fiber is improved, the applicant believes that the reason may be that hydrogen bond interaction exists among the epoxy acrylate, the urethane acrylate and the hydroxyl acrylate resin, and the mass ratio of the epoxy acrylate, the urethane acrylate and the hydroxyl acrylate resin is 1: (1.5-2.5): (2.5-3.5), the cross-linking density of the acrylic resin coating and the adhesive force to the methyl vinyl phenyl silicone rubber are improved.
Preferably, the urethane acrylate is a mixture of a hexafunctional aliphatic urethane acrylate and an aliphatic urethane acrylate containing NCO groups; the mass ratio of the hexafunctional aliphatic polyurethane acrylate to the aliphatic polyurethane acrylate containing NCO groups is (5-7): 1.
by adopting the technical scheme, the application adopts the combined action of the hexafunctional aliphatic urethane acrylate and the aliphatic urethane acrylate containing NCO groups, is favorable for further improving the adhesive force of the p-methyl vinyl phenyl silicone rubber, greatly accelerates the curing speed, improves the wear resistance of the coating layer, and further improves the bending resistance of the optical fiber. By controlling the contents of the hexafunctional aliphatic urethane acrylate and the aliphatic urethane acrylate containing NCO groups, the viscosity of the urethane acrylate can be adjusted, the ultraviolet curing coating and the methyl vinyl phenyl silicone rubber can form a hybrid and crosslinking system, the mechanical strength of the optical fiber is improved, the optical performance of a coating layer can be improved, the influence of the external temperature on the refractive index of the coating layer is reduced, and the transmission efficiency of the optical fiber is improved.
Preferably, the epoxy acrylate is bisphenol a epoxy acrylate.
Through adopting above-mentioned technical scheme, this application adopts bisphenol A epoxy acrylate, has not only improved the mechanical strength of optic fibre, can also improve adhesive force and the wearability of coating layer.
In a second aspect, the present application provides a method for manufacturing an optical fiber, which adopts the following technical scheme:
a method of making an optical fiber comprising the steps of:
depositing silicon by adopting a first blowtorch to form a fiber core;
depositing silicon and germanium on the surface of the fiber core by adopting a second torch to form a cladding;
placing the fiber preform in chlorine gas for dehydroxylation treatment, then performing an annealing process, and performing sintering treatment to obtain an optical fiber preform;
and carrying out wire drawing treatment, secondary heating annealing treatment, cooling, coating silicon rubber, ultraviolet curing treatment and take-up on the optical fiber preform to obtain the optical fiber.
By adopting the technical scheme, the fiber core and the cladding are prepared by VAD (vapor deposition) technology through continuous deposition, the germanium-doped silicon layer can be uniformly coated on the surface of the fiber core, the light leakage in the fiber core is reduced, and the loss of the optical fiber during bending can be reduced; the internal stress between the fiber core and the cladding is reduced by adopting dehydroxylation treatment in chlorine, so that the loss of light transmitted in the optical fiber is reduced; the optical fiber preform is subjected to wire drawing treatment, so that the optical fiber with a fixed inner diameter size can be realized, the density distribution uniformity of the optical fiber can be realized by adopting secondary heating annealing treatment, and the optical fiber can be protected by coating silicon rubber.
Preferably, the flame temperature of the first torch is 800-.
By adopting the technical scheme, the flame temperature of the first blast lamp is controlled to be 800-900 ℃, the prepared fiber core can realize the diameter not higher than 5 microns, and certain toughness is kept.
Preferably, SiCl is introduced into the second blast lamp4Gas, GeCl4Gas, oxygen, hydrogen, argon; the SiCl4Gas, GeCl4The flow rates of the gas, the oxygen, the hydrogen and the argon are respectively 8-12mL/min, 10-20 muL/min, 60mL/min, 6mL/min and 150 mL/min.
By adopting the technical scheme, the application controls SiCl in the second blast lamp4Gas, GeCl4The germanium doping amount in the cladding is adjusted by the flow of the gas, the oxidation-reduction reaction is easy to occur when the germanium doping amount is large, and the refractive index of the optical fiber is difficult to increase when the germanium doping amount is small.
Preferably, the drawing temperature of the drawing treatment is 2200-.
Through adopting above-mentioned technical scheme, this application carries out the wire drawing processing to above-mentioned optical fiber perform, improves the internal diameter of optic fibre and the bending resistance of optic fibre through control wire drawing temperature, wire drawing speed, and wire drawing temperature is too high and wire drawing speed can reduce the bending resistance of optic fibre too fast, and wire drawing temperature is low excessively and wire drawing speed all can not obtain the optic fibre that the internal diameter is little too slowly.
In summary, the present application has the following beneficial effects:
1. the application provides the optical fiber with the fiber core with the diameter not higher than 5 microns and the coating layer with the outer diameter not higher than 70 microns, the number of the optical fibers can be increased in a pipeline with the same size, the signal transmission efficiency is obviously improved, and the bending resistance is improved while the diameter of a single-core optical fiber is reduced;
2. according to the preparation method, the ultraviolet curing coating is coated on the surface of the methyl vinyl phenyl silicone rubber, so that the wear resistance can be improved, the bending resistance of a coating layer to an optical fiber can also be improved, and the crosslinking density of the acrylic resin coating and the adhesive force to the methyl vinyl phenyl silicone rubber are improved by the epoxy acrylate, the polyurethane acrylate and the hydroxyl acrylate resin;
3. according to the preparation method, the hexafunctional aliphatic urethane acrylate and the aliphatic urethane acrylate containing NCO groups are adopted, and the mass ratio of the hexafunctional aliphatic urethane acrylate to the aliphatic urethane acrylate containing NCO groups is controlled, so that the mechanical strength of the optical fiber is improved, the optical performance of a coating layer can be improved, the influence of the external temperature on the refractive index of the coating layer is reduced, and the transmission efficiency of the optical fiber is improved;
4. the fiber core and the cladding are prepared by adopting a torch gas-phase axial deposition method, the germanium-doped silicon layer can be uniformly coated on the surface of the fiber core, the light leakage in the fiber core is reduced, and the loss of the optical fiber during bending can be reduced; the internal stress between the fiber core and the cladding is reduced by adopting dehydroxylation treatment in chlorine, so that the loss of light transmitted in the optical fiber is reduced;
5. the application controls SiCl in the second blast lamp4Gas, GeCl4The flow rate of the gas is 8-12mL/min and 10-20 muL/min, so that the proper germanium doping amount is obtained, and the refractive index of the optical fiber is improved; the inner diameter of the optical fiber and the bending resistance of the optical fiber are improved by controlling the drawing temperature and the drawing speed.
Detailed Description
The present application is described in further detail below with reference to preparation examples and examples.
Preparation example
Preparation examples 1 to 7
The following description will be made by taking preparation example 1 as an example, wherein the photoinitiator is (2,4, 6-trimethylbenzoyl) diphenylphosphine oxide with CAS number of 75980-60-8; the solvent is a mixture of diacetone alcohol (CAS number is 123-42-2), n-butyl acetate and propyl acetate, and the mass ratio of the diacetone alcohol to the n-butyl acetate to the propyl acetate is 1:2: 2; the hexafunctional aliphatic polyurethane acrylate is of a brand GN8601 and is purchased from Hunan Youny chemical technology Co., Ltd; the hydroxyl acrylate resin is FX-965, and is purchased from Nantong Fangxin chemical Co., Ltd; the epoxy acrylate is bisphenol A epoxy acrylate with the trade name of FX-8002-80 and purchased from the company Fangxin resin science and technology, Inc.; the auxiliary agent is a mixture of Silok 355 organic silicon leveling agent and YWA-defoaming agent, the mass ratio of the Silok 355 organic silicon leveling agent to the YWA-defoaming agent is 2:1, the Silok 355 organic silicon leveling agent is purchased from Shandong Mole chemical engineering Co., Ltd, and the YWA-defoaming agent is purchased from Shandong Yiwei Anhua chemical engineering Co., Ltd; the aliphatic urethane acrylate containing NCO groups has the trade name Laromer LR9000 and is purchased from Pasteur Germany;
the methyl vinyl phenyl silicone rubber has a ratio of phenyl groups to silicon atoms of 5mol%, and is purchased from Zhejiang Bayu science and technology Limited;
preparation example 1 provides a method for preparing a silicone rubber containing an ultraviolet-curable coating, which comprises the following steps:
(1) mixing 0.06g of photoinitiator and 2g of solvent, and uniformly stirring;
(2) adding 1.25g of hexafunctional aliphatic polyurethane acrylate, 2.5g of hydroxyl acrylate resin and 1g of epoxy acrylate, and uniformly mixing;
(3) adding 0.003g of auxiliary agent, stirring uniformly, and then adding 3g of solvent;
(4) adding 0.25g of aliphatic polyurethane acrylate containing NCO groups before coating the surface of the ultraviolet curing coating on the surface of the methyl vinyl phenyl silicone rubber to obtain an ultraviolet curing coating;
(5) and (3) coating an ultraviolet curing coating on the surface of 20g of methyl vinyl phenyl silicone rubber to obtain the silicone rubber containing the ultraviolet curing coating.
As shown in table 1, the silicone rubbers containing uv curable coatings of preparation examples 1 to 6 were different only in the quality of the raw materials for their preparation.
TABLE 1
Preparation example 1
Preparation example 2
Preparation example 3
Preparation example 4
Preparation example 5
Preparation example 6
Preparation example 7
Photoinitiator
0.06g
0.08g
0.07g
0.07g
0.07g
0.07g
0.07g
Step (1) solvent
2g
3g
2.5g
2.5g
2.5g
2.5g
2.5g
Hexafunctional aliphatic urethane acrylates
1.25g
2.2g
1.7g
0g
1.7g
1.7g
1.7g
Hydroxy acrylate resin
2.5g
3.5g
3g
3g
3g
0g
3g
Epoxy acrylate
1g
1g
1g
1g
1g
1g
0g
Auxiliary agent
0.003g
0.004g
0.003g
0.003g
0.003g
0.003g
0.003g
Step (3) solvent
3g
5g
4g
4g
4g
4g
4g
Aliphatic urethane acrylates containing NCO groups
0.25g
0.3g
0.3g
0.3g
0g
0.3g
0.3g
Methyl vinyl phenyl silicone rubber
20g
20g
20g
20g
20g
20g
20g
Preparation examples 8 to 11, the same as preparation example 3, were different only in the preparation raw materials of the silicone rubber containing the uv curable coating:
preparation example 8, except that: the epoxy acrylate was replaced with tripropylene glycol diacrylate and the CAS number is 42978-66-5.
Preparation example 9, except that: bisphenol A epoxy acrylate was replaced with glycidyl methacrylate, CAS number 106-91-2, purchased from JI south Hui Sichuan chemical Co.
Preparation example 10, except that: the methyl vinyl phenyl silicone rubber has a phenyl to silicon atom ratio of 10mol%, and is available from Zhejiang BoYu science and technology Ltd.
Preparation example 11, except that: the methyl vinyl phenyl silicone rubber has a phenyl to silicon atom ratio of 15mol%, and is available from Zhejiang BoYu science and technology Ltd.
Examples
Examples 1 to 11
The following description will be given by taking example 1 as an example.
The method of making an optical fiber provided in example 1 includes the steps of:
s1: adopting a first blowtorch with the flame temperature of 800 ℃, and continuously depositing by VAD technology to obtain a fiber core; SiCl is introduced into the first blast lamp4Gas, oxygen, hydrogen, argon; the SiCl4The flow rates of the gas, the oxygen, the hydrogen and the argon are respectively 2.8mL/min, 35mL/min, 4mL/min and 200 mL/min;
s2: adopting a second blowtorch with the flame temperature of 1100 ℃, and continuously depositing on the surface of the fiber core by VAD technology to obtain a cladding; SiCl is introduced into the second blast lamp4Gas, GeCl4Gas, oxygen, hydrogen, argon; the SiCl4Gas, GeCl4The flow rates of the gas, the oxygen, the hydrogen and the argon are respectively 8mL/min, 10 mu L/min, 60mL/min, 6mL/min and 150 mL/min;
s3: placing the cladding in chlorine, carrying out dehydroxylation treatment at 1150 ℃, then carrying out annealing process, and sintering treatment to obtain an optical fiber preform; the temperature of the annealing process is 950 ℃ and the time is 5 h;
s4: drawing the optical fiber preform at 2200 ℃ at a speed of 4000 m/min; and (3) placing the fiber preform subjected to wire drawing treatment in a resistance furnace, carrying out secondary heating annealing treatment at 1300 ℃, cooling, coating the silicone rubber containing the ultraviolet curing coating material in the preparation example 1, carrying out curing treatment by adopting an ultraviolet source of 380nm under the power of 250W, and taking up to obtain the optical fiber.
As shown in table 1, the optical fibers of examples 1 to 11 were prepared by methods different only in the silicone rubber containing the uv curable coating material, example 1 corresponding to preparation example 1, example 2 corresponding to preparation example 2, and examples 3 to 11 corresponding to preparation examples 3 to 11, respectively.
Examples 12 to 17
Examples 12-17, which are the same as example 3, differ only in the parameters of the process for the preparation of the optical fiber, see table 2.
TABLE 2
Example 3
Example 12
Example 13
Example 14
Example 15
Example 16
Example 17
Flame temperature of the first torch
800℃
900℃
900℃
900℃
900℃
900℃
700℃
Introducing SiCl into the first blast lamp4Flow of gas
2.8mL/min
2.8mL/min
2.8mL/min
2.8mL/min
2.8mL/min
2.8mL/min
5mL/min
Introducing SiCl into the second blast lamp4Flow of gas
8mL/min
12mL/min
12mL/min
12mL/min
12mL/min
12mL/min
12mL/min
GeCl is introduced into the second blast lamp4Flow of gas
10μL/min
20μL/min
15μL/min
20μL/min
20μL/min
0μL/min
15μL/min
Flame temperature of the second torch
1100℃
1100℃
1100℃
1100℃
1100℃
1100℃
1100℃
Temperature of wire drawing
2200℃
2300℃
2300℃
2000℃
2500℃
2300℃
2300℃
Wire drawing speed
4000m/min
5000m/min
4500m/min
2000m/min
7000m/min
4500m/min
4500m/min
Comparative example
Comparative examples 1 to 2
Comparative examples 1 to 2, the same as example 1, except that the silicone rubber containing the uv curable coating of the preparation example was not used.
Comparative example 1, except that: and directly coating methyl vinyl phenyl silicone rubber with 5mol% of phenyl and silicon atom ratio after cooling.
Comparative example 2, except that: and directly coating the ultraviolet curing coating after cooling.
Performance test
The following performance tests were performed on the silicone rubbers containing the uv curable coating provided in preparation examples 1 to 11 of the present application;
1. adhesion force: the adhesion of the silicone rubber containing the UV-curable coating described in preparation examples 1-11 was tested by the method of GB/T9286-1998, and the test results are shown in Table 3, with 0-5 being the best, and 5 being the worst.
2. Wear resistance: the silicone rubbers containing the UV-curable coating described in preparation examples 1 to 11 were tested for abrasion resistance by the ISO 7784 rotating friction rubber wheel method under a load of 175g, and the average number of grinding revolutions required to abrade a 1 μm thick coating was recorded, and the test results are shown in Table 3.
3. Hardness: the hardness of the silicone rubber containing the ultraviolet curing coating described in preparation examples 1-11 was determined by the GB/T6739-.
TABLE 3
Adhesion force
Wear resistance
Hardness of
Preparation example 1
1
420
3H
Preparation example 2
0
480
3H
Preparation example 3
0
478
3H
Preparation example 4
4
340
2H
Preparation example 5
2
380
H
Preparation example 6
3
318
2H
Preparation example 7
3
287
2H
Preparation example 8
2
350
H
Preparation example 9
2
320
H
Preparation example 10
2
465
4H
Preparation example 11
3
420
5H
The present application is described in detail below with reference to the test data provided in table 3.
From the preparation examples 1 to 7, the content of the raw materials for preparing the ultraviolet curing coating has a large influence on the adhesion, wear resistance and hardness of the silicone rubber containing the ultraviolet curing coating, and the hexafunctional aliphatic urethane acrylate, the aliphatic urethane acrylate containing NCO groups, the hydroxy acrylate resin and the epoxy acrylate act together to remarkably improve the adhesion, wear resistance and hardness.
From the preparation examples 3 and 8-9, the bisphenol A epoxy acrylate can obviously improve the wear resistance and hardness of the silicone rubber containing the ultraviolet curing coating.
From preparation examples 3 and 10 to 11 of the present application, it is known that the methyl vinyl phenyl silicone rubber has an excessively large ratio of phenyl groups to silicon atoms, which increases the hardness, but reduces the adhesion of the silicone rubber containing the ultraviolet curable coating.
The following performance tests were carried out with respect to the optical fibers provided in examples 1 to 17 of the present application and comparative examples 1 to 2;
4. inner diameter of optical fiber: the fibers of examples 1-17 and comparative examples 1-2 were tested for inside diameter using a DWY-1 electron micrometer gauge, wherein an inside diameter of less than 4 micrometers is designated a, an inside diameter of 4-4.5 micrometers and not equal to 4.5 micrometers is designated B, an inside diameter of 4.5-5 micrometers is designated C, and an inside diameter greater than 5 micrometers is designated D, and the results are shown in table 4.
5. Outer diameter of the optical fiber: the optical fibers of examples 1-17 and comparative examples 1-2 were tested for outside diameter using a DWY-1 electron micrometer gauge, wherein an outside diameter of less than 60 micrometers is designated a, an outside diameter of 60-65 micrometers and not equal to 65 micrometers is designated B, an outside diameter of 65-70 micrometers is designated C, and an outside diameter greater than 70 micrometers is designated D, and the results are shown in table 4.
6. Bending loss: the performance of the optical fibers described in examples 1-17 and comparative examples 1-2 was tested using a PK2400 fiber characteristics analyzer for the bend loss induced at a wavelength of 1310nm for 1 turn of the optical fiber, wherein a bend loss of less than 0.04dB was designated as A, a bend loss of 0.04-0.06dB and not equal to 0.06dB was designated as B, a bend loss of 0.06-0.08dB and not equal to 0.08dB was designated as C, a bend loss of 0.08-0.1dB and not equal to 0.1dB was designated as D, a bend loss of more than 0.1dB was designated as E, and the test results are shown in Table 4.
TABLE 4
Inner diameter
Outside diameter
Bending loss
Example 1
B
B
B
Example 2
B
B
A
Example 3
B
A
A
Example 4
B
C
C
Example 5
B
C
C
Example 6
B
C
B
Example 7
B
C
B
Example 8
B
C
B
Example 9
B
C
B
Example 10
B
B
A
Example 11
C
C
B
Example 12
B
B
A
Example 13
B
B
A
Example 14
D
C
B
Example 15
A
A
E
Example 16
B
B
D
Example 17
D
C
C
Comparative example1
C
B
E
Comparative example 2
C
B
E
The optical fiber of the present application is described in detail below with reference to the test data provided in table 4.
It is understood from examples 1 to 11 of the present application that the optical fiber obtained in preparation example 3 has a small inner diameter and outer diameter and is excellent in bending resistance.
It is known from examples 3 and 12 to 17 of the present application that in the process for producing an optical fiber, each parameter has a large influence on the inner diameter, the outer diameter, and the bending loss of the optical fiber, and among them, the optical fibers corresponding to examples 12 and 13 have a small diameter and excellent bending resistance.
It can be seen from example 1 and comparative examples 1 to 2 of the present application that the bending resistance of the optical fiber can be significantly improved by using the silicone rubber containing the uv curable coating.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：光纤的加工工艺