CN112305664A - Multipurpose polarization maintaining optical fiber and preparation method thereof - Google Patents
Multipurpose polarization maintaining optical fiber and preparation method thereof Download PDFInfo
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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
- G02B6/024—Optical fibres with cladding with or without a coating with polarisation maintaining properties
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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
- G02B6/036—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
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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
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
Abstract
The invention relates to a multipurpose polarization maintaining optical fiber and a preparation method thereof, belonging to the technical field of polarization maintaining optical fibers. The cross section structure of the optical fiber sequentially comprises a core layer (1), an inner cladding layer (2), an outer cladding layer (3) and a coating layer from inside to outside, wherein the core layer (1) is made of germanium-doped quartz glass and has a diameter D1Refractive index n1(ii) a The inner cladding (2) is made of phosphorus-doped quartz glass with a diameter D2Refractive index n2(ii) a The outer cladding (3) is made of phosphorus-doped quartz glass with a diameter D3Refractive index n3(ii) a Two stress regions (4) with a diameter of D are arranged in the inner cladding (2)4Respectively boron-and fluorine-doped quartz glass with refractive index n4The two stress regions (4) are symmetrically arranged on two sides of the core layer (1); the refractive index difference n between the core layer (1) and the inner cladding layer (2)1‑n20.005-0.020; the refractive index difference n between the inner cladding (2) and the stress region (4)2‑n40.008 to 0.015. The optical fiber can be suitable for manufacturing collar of optical fiber deviceThe grinding and tapering process of the domain can also be suitable for the ring winding process in the field of fiber optic gyroscope manufacture.
Description
Technical Field
The invention relates to a polarization maintaining optical fiber, in particular to a panda type polarization maintaining optical fiber and a preparation method thereof.
Background
The polarization maintaining fiber, namely the polarization maintaining fiber, is used for transmitting linearly polarized light, and when linearly polarized light is coupled into the polarization maintaining fiber, if the polarization direction of the linearly polarized light is superposed with the polarization main shaft of the polarization maintaining fiber, the linearly polarized light can maintain the linear polarization direction until leaving the polarization maintaining fiber in the transmission process, namely the birefringence phenomenon of the polarization maintaining fiber. The birefringence phenomenon of the optical fiber is caused by a plurality of reasons, birefringence is introduced by geometric and stress nonuniformity, and the stress birefringence polarization-maintaining optical fiber mainly comprises a bow-tie type polarization-maintaining optical fiber, a panda type polarization-maintaining optical fiber, an elliptical cladding type polarization-maintaining optical fiber and the like.
The polarization maintaining optical fiber is widely applied to various fields of national economy such as aerospace, aviation, navigation, industrial manufacturing technology, communication and the like, and in an interference optical fiber sensor based on optical coherent detection, the polarization maintaining optical fiber can ensure that the linear polarization direction is unchanged, and the coherent signal-to-noise ratio is improved, so that high-precision measurement of physical quantity is realized. The polarization maintaining fiber is used as a special fiber, is mainly applied to sensors such as fiber optic gyroscopes and fiber optic hydrophones and fiber optic communication systems such as DWDM and EDFA, and is a special fiber type with wide application value.
According to the application characteristics of the polarization maintaining optical fiber, the polarization maintaining optical fiber is mainly applied to two blocks: the first is the fiber-optic gyroscope system, and the second is the polarization-maintaining fiber device. Optical fibers also vary depending on the application in which they are used. When applied to a fiber optic gyroscope system, the related fiber high birefringence fiber is mainly characterized by the large effective area of a stress area and the high-concentration doping of boron elements, so as to ensure the high polarization crosstalk after the fiber is wound. Correspondingly, when the method is applied to a polarization maintaining optical fiber device, the process involves mechanical grinding of the end face of the optical fiber, so that certain requirements are placed on the size of a stress region of the polarization maintaining optical fiber and the concentration of boron element, the large effective area of the stress region and the high-concentration doping of B element can cause the cross section cracking phenomenon of the stress region and a cladding in the grinding process, because the high-concentration B doping can obviously reduce the relative refractive index of the stress region, but also can cause the thermal expansion coefficient of the stress region to be greatly increased compared with the cladding, and cracking is easily caused at an interface in the grinding process, so that the optical fiber applicable to an optical fiber gyro system cannot be applicable to the processing of the optical fiber device.
At present, the polarization maintaining optical fiber for the domestic optical fiber gyroscope basically realizes domestic autonomy, the polarization maintaining optical fiber for the device has relatively small market capacity due to the process reasons, and the polarization maintaining optical fiber for the domestic optical fiber device mainly depends on imported optical fiber.
Chinese patent CN103145349A discloses a method for manufacturing a low-stress polarization maintaining fiber for coupling, which mainly uses a processing method of stripping the bare fiber part from the end of the original polarization maintaining fiber, and uses a platform construction and adhesive coating to reduce the extinction ratio deterioration caused by the stress on the polarization maintaining fiber when the adhesive is in high and low temperature states. The invention realizes low stress of the optical fiber by improving the post-processing mode of the polarization maintaining optical fiber, and does not relate to the change of the optical fiber.
Chinese patent CN106291807A discloses a cracking-proof panda-type polarization maintaining optical fiber, which is characterized in that a refractive index gradual transition layer is arranged at the edge of a stress layer, so that the stress at the edge of the stress layer is decomposed and slowly released, cracking of the edge of the end face of the optical fiber grinding stress layer is avoided, and the service performance of the polarization maintaining optical fiber is optimized. The original polarization maintaining optical fiber is optimized from the design angle of a stress area of the polarization maintaining optical fiber, the wear resistance of the optical fiber is improved, but the birefringence performance of the optical fiber is influenced by arranging the refractive index gradual change transition layer, so that the precision requirement of the winding ring is influenced, and the performance of the optical fiber gyroscope is sacrificed.
Disclosure of Invention
The invention aims to design a polarization maintaining optical fiber, in particular to a panda type polarization maintaining optical fiber, which can be adapted to grinding and tapering processes on the premise of not sacrificing the double refraction performance, so that the optical fiber can be applied to the fields of optical fiber gyroscopes and optical fiber devices.
The research of the invention mainly comprises:
(1) by properly reducing the thermal expansion coefficient of the stress area of the optical fiber, the internal stress is reduced, and the risk of end face cracking of the optical fiber during grinding caused by overlarge internal stress in the stress area is reduced.
(2) The viscosity of the inner cladding and the outer cladding is reduced by doping phosphorus in the inner cladding and the outer cladding, so that the softening temperature of the inner cladding and the outer cladding of the optical fiber is reduced, and the optical fiber tapering process is suitable for implementation. Furthermore, the doping proportion of P in the inner cladding and the outer cladding is researched and controlled, so that the tapering experience is improved, the grinding effect is ensured, and the requirements of tapering and grinding processes in the application field of optical fiber devices are met.
(3) When the outer cladding layer P is doped, a gradual doping design is used, the quartz viscosity near the stress region is mainly reduced, the viscosity difference of the interface between the inner cladding layer where the stress region is located and the outer cladding layer is reduced, the adaptability of the stress region and the quartz cladding layer is enhanced, and the risk of edge cracking of the stress region during optical fiber grinding can be further reduced.
The invention adopts the following specific technical scheme: a multi-purpose polarization maintaining optical fiber comprises a core layer, an inner cladding layer, an outer cladding layer and a coating layer from inside to outside in sequence,
the core layer isGermanium-doped quartz glass with diameter D1Doping mol percent of germanium is 3-8 mol percent, and refractive index n is11.46 to 1.48;
the inner cladding (2) is made of phosphorus-doped quartz glass with the diameter of D2Refractive index of n21.4565-1.4570;
the outer cladding layer (3) is made of phosphorus-doped quartz glass with the diameter D3Refractive index n31.4565-1.4570;
two stress regions (4) with a diameter of D are arranged in the inner cladding (2)4Respectively, of boron-and fluorine-doped quartz glass, refractive index n4The stress areas are 1.34-1.48, and the two stress areas (4) are symmetrically arranged on two sides of the core layer (1);
the difference n between the refractive indices of the core layer (1) and the inner cladding (2)1-n2＝0.005～0.020；
The difference n between the refractive indices of the inner cladding (2) and the stress region (4)2-n4＝0.008～0.015。
As one embodiment of the present application: the boron doping mole percentage of the stress region (4) is 20-35 mol.%, the fluorine doping mole percentage is 0.5-2 mol.%, and the fluorine and boron doping mole ratio is within the range of 0.025, 0.05; the stress region (4) has a coefficient of thermal expansion of 1.5 x 10-5～5*10-5。
As one embodiment of the present application: the phosphorus doping molar concentration of the inner cladding (2) is 0.1-0.8 mol.%, and the softening temperature of the inner cladding (2) is 1500-1600 ℃; the phosphorus doping molar concentration of the outer cladding layer (3) is 0.2-1.6 mol.%, and the softening temperature of the outer cladding layer (3) is 1600-1700 ℃. The phosphorus doping molar concentration ratio epsilon (1, 2) of the inner cladding (2) and the outer cladding (3).
As one embodiment of the present application: the phosphorus doping of the inner cladding (2) is uniform doping, the phosphorus doping molar concentration of the outer cladding (3) is in a gradual change type along the radius direction, and the doping molar concentration is gradually reduced from inside to outside by taking the boundary with the inner cladding (2) as an initial point.
As one embodiment of the present application: the coating layer comprises an inner coating layer (5) and an outer coating layer (6), the modulus of the inner coating layer (5) is 0.5 MPa-50 MPa, and the modulus of the outer coating layer (6) is 500 MPa-1200 MPa.
As one embodiment of the present application: diameter D of the core layer (1)1Is 4-6 μm, the diameter D of the inner cladding (2)220-120 μm, the diameter D of the outer cladding (3)360-125 μm, the diameter D of the stress region (4)412 to 50 μm.
The polarization maintaining optical fiber has the following characteristics:
(1) ge is doped in the design of the core layer, P is doped in the design of the inner cladding, and the difference value of the refractive indexes of the core layer and the inner cladding is kept between 0.005 and 0.020 by controlling the doping proportion, so that the refractive performance is ensured, and the optical fiber has good propagation performance. Under the premise, after the inner cladding is doped with P, the softening temperature of the inner cladding is reduced from 1750 ℃ to about 1550 ℃, namely, the viscosity of the inner cladding is reduced, so that the optical fiber can be matched with the tapering process of an optical fiber device.
(2) The stress region is designed to be B, F codoped, B and F both have the effect of reducing refractive index, but the thermal expansion coefficients of the B and the F are different, the thermal expansion coefficient of the F is obviously lower than that of the B, and the SF is controlled6And BCl3The doping proportion of the stress area can be adjusted, the difference between the refractive indexes of the stress area and the cladding is in the range of 0.008-0.015, and meanwhile, the thermal expansion coefficient of the stress area can be randomly adjusted to reduce the internal stress of the stress area, so that the risk of cracking of the end face of the optical fiber during grinding caused by the overlarge internal stress of the stress area of the optical fiber is reduced, and the optical fiber can be matched with the grinding process of an optical fiber device.
(3) P is doped in the design of the outer cladding layer, the softening temperature of the outer cladding layer can be reduced, the viscosity of the outer cladding layer is reduced, the gradual change type P doping concentration is optimized, the tapering operability of the inner cladding layer and the outer cladding layer can be improved, the quartz viscosity near a stress region can be reduced, the viscosity difference between the stress region and the near viscosity is reduced, the adaptability of the stress region and the outer cladding layer is enhanced, and the risk of edge cracking of the stress region during optical fiber grinding can be further reduced.
The preparation method of the multipurpose polarization maintaining optical fiber comprises the following steps
(1) Preparing a core rod: preparing a germanium-doped quartz preform;
(2) preparing an inner cladding layer and an outer cladding layer: the forming of the inner phosphorus-doped quartz cladding layer and the outer phosphorus-doped quartz cladding layer is completed in sequence outside the core part;
(3) preparing a stress bar: preparing a fluorine-boron co-doped quartz preform;
(4) assembling a stress rod: drilling two through holes in the inner cladding of the prefabricated rod prepared in the step (2), respectively plugging two stress rods prepared in the step (3) into the through holes, wherein the two stress rods are symmetrically arranged relative to the core rod;
(5) drawing the prefabricated rod into a quartz optical fiber;
(6) and coating and curing the quartz optical fiber to form a coating layer.
Specifically, the step (1) adopts a mode of vapor deposition in a tube to carry out in-tube deposition of the germanium-doped quartz material, uses lathe oxyhydrogen flame as a heating source, and introduces SiCl into the tube4And GeCl4Silicon dioxide and germanium dioxide particles generated by reaction in the tube are deposited on the inner wall of the tube by utilizing the thermophoresis principle and are vitrified at the same time, and the tube is collapsed into a solid core rod after the deposition is finished.
Specifically, the step (2) adopts an external vapor deposition mode, and SiCl is sprayed by an oxyhydrogen flame burner4、POCl3Spraying raw material steam onto the rotating core rod, reacting in oxyhydrogen flame to generate submicron-grade phosphorus-containing quartz particles, depositing on the surface of the core rod to form the inner and outer claddings of the core rod, and controlling POCl in the deposition process3And SiCl4To adjust the doping concentration of phosphorus to prepare an inner cladding and an outer cladding on the outer layer of the core rod.
Specifically, the step (3) adopts a mode of vapor deposition in a tube to carry out in-tube deposition of the fluorine-doped and boron-doped quartz material, and uses a lathe oxyhydrogen flame as a heating source to introduce SF into the tube6、BCl3、SiCl4Reacting in the tube to generate silicon dioxide particles containing boron and fluorine, depositing on the inner wall of the tube and vitrifying at the same time, and collapsing into a solid core rod after the deposition is finished, wherein the solid core rod is a stress rod; both fluorine and boron can reduce the refractive index of the stress region, the thermal expansion coefficient of fluorine is smaller than that of boron, and the ratio of fluorine to boron is adjustedFor example, to balance the refractive index and the coefficient of thermal expansion of the stress rods.
Compared with the prior art, the invention has the advantages that:
1. the polarization-maintaining optical fiber can be suitable for the grinding and tapering processes in the field of manufacturing optical fiber devices and the winding process in the field of manufacturing optical fiber gyroscopes, and realizes multiple purposes.
2. According to the polarization maintaining optical fiber, the doping ratio of fluorine and boron in the stress region is optimized, the thermal expansion coefficient of the stress region can be adjusted and optimized under the condition that the refractive index of the polarization maintaining optical fiber is not changed, and the process requirements of different application devices can be met.
3. According to the polarization maintaining optical fiber, by means of the inner and outer cladding segmented phosphorus-doped design, on the premise that the optical propagation condition of the optical fiber is not influenced, the viscosity of a silicon layer of the optical fiber can be effectively reduced, the melting temperature is reduced, and the operability of the tapering treatment process of the optical fiber is improved.
Drawings
FIG. 1 is a schematic cross-sectional view of a polarization maintaining optical fiber according to the present invention;
FIG. 2 is a schematic cross-sectional view of the refractive index of a polarization maintaining fiber according to the present invention;
in the figure, a core layer 1, an inner cladding layer 2, an outer cladding layer 3, a stress region 4, an inner coating layer 5 and an outer coating layer 6.
Detailed Description
The present invention will be described in further detail below with reference to the attached drawings, which are illustrative and are not to be construed as limiting the invention. The description of the embodiments is made with reference to the accompanying drawings and should not be construed as limiting the scope of the invention.
As shown in FIG. 1, the cross-sectional structure of the polarization maintaining fiber in the embodiment of the invention comprises a core layer 1, an inner cladding layer 2, an outer cladding layer 3 and a coating layer from inside to outside in sequence, wherein the core layer 1 is germanium-doped quartz glass and has a diameter D1Refractive index n1(ii) a The inner cladding 2 is made of phosphorus-doped quartz glass with a diameter D2Refractive index n2(ii) a The outer cladding 3 is made of phosphorus-doped quartz glass with a diameter D3Refractive index n3(ii) a Two stress regions 4 with a diameter D are arranged in the inner cladding 24Respectively boron-and fluorine-doped quartz glass with refractive index n4The two stress regions 4 are symmetrically arranged on two sides of the core layer 1; refractive index difference n between core layer 1 and inner cladding layer 21-n20.005-0.020; the difference n between the refractive indices of the inner cladding 2 and the stress region 42-n4＝0.008～0.015。
Table 1 shows a parameter comparison between example 4 and comparative examples 1 to 3 obtained based on the above-described cross-sectional structure
TABLE 1
The polarization maintaining optical fiber of the embodiment increases POCl3 reaction doping in the deposition process of inner cladding SiO2, reduces the softening temperature of a silicon layer from 1750 ℃ to about 1550 ℃, can effectively improve the deposition efficiency of the silicon layer, and can also improve the applicability of a user in the optical fiber tapering process.
In the polarization maintaining optical fiber of the embodiment, the stress layer is doped with fluorine and boron, B and F both have the refractive index reduced, but the thermal expansion coefficients are different, the difference value of the refractive indexes of the stress region and the cladding is controlled to be 0.008-0.015 by controlling the doping proportion of SF6 and BCl3, the thermal expansion coefficient of the stress region can be correspondingly optimized, the internal stress is reduced, and the risk of end surface explosion caused by overlarge internal stress of the stress region of the optical fiber during grinding is reduced.
As an implementation mode, the production process of the polarization maintaining optical fiber adopts the following steps:
step one, core rod preparation: the method mainly uses a mode of vapor deposition in the tube to carry out in-tube deposition of silicon germanium materials, uses lathe oxyhydrogen flame as a heating source, leads in high-purity silicon tetrachloride and germanium tetrachloride with different proportions at the front end to react to generate silicon dioxide and germanium dioxide particles, deposits the silicon dioxide and the germanium dioxide particles on the inner wall of a base tube by using a thermophoresis principle and simultaneously carries out vitrification, and after the deposition is finished, the silicon dioxide and the germanium dioxide particles are collapsed into a solid core rod.
Step two, preparing an inner cladding layer and an outer cladding layer: mainly adopts an external vapor deposition mode, the flame is sprayed to the core rod by an oxyhydrogen flame torch, meanwhile, raw material steam such as SiCl4, POCl3 and the like is introduced into the torch, the raw material steam reacts in the oxyhydrogen flame, and the generated phosphorus-containing quartz particles with submicron sizes are deposited on the surface of the core rod to form an inner cladding and an outer cladding of the core rod. In the step, the phosphorus doping ratio of the inner cladding is more than or equal to that of the outer cladding, the POCl3 and SiCl4 are accurately controlled in flow under the premise of not influencing the optical guide condition of the optical fiber, the specific flow can be adjusted according to the specific process requirements, the typical concentration values of the POCl3 and the SiCl4 during the deposition of the inner cladding are about 1:3, and the typical phosphorus doping ratio of the inner cladding and the outer cladding is about 3: 2. It is noted that the inner cladding dimension needs to cover the stress region portion when deposited, as shown in fig. 1. The design aims at ensuring that the stress region is in the inner cladding region with relatively low softening temperature, and the risk of explosion during the edge grinding of the stress region can be reduced.
Step three, preparing a stress rod: the method mainly adopts a mode of vapor deposition in a tube to carry out in-tube deposition of fluorine, boron and silicon materials, uses lathe oxyhydrogen flame as a heating source, leads high-purity SF6, BCl3 and SiCl4 with different proportions at the front end to react to generate silicon dioxide particles containing boron and phosphorus, deposits on the inner wall of a base tube and simultaneously carries out vitrification, and collapses into a solid core rod after the deposition is finished. In the step, the main purpose of fluorine and boron is to reduce the refractive index, because the refractive indexes of the two raw materials are similar, the thermal expansion coefficient of boron is larger than that of fluorine, the refractive index and the thermal expansion coefficient of the stress rod are controlled by adjusting and optimizing the proportion of fluorine and boron, and the abrasion resistance of the final optical fiber stress region is ensured. In the process of fluorine-boron co-doping, in order to avoid the situation that the thermal expansion coefficient of a stress region is too low due to too large fluorine doping amount, the flow rate of the stress region needs to be accurately controlled according to the process requirement, and the typical control value of the concentration ratio of fluorine and boron can be about 1: 30.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (10)
1. A multi-purpose polarization maintaining optical fiber, comprising: the core layer (1), the inner cladding layer (2), the outer cladding layer (3) and the coating layer are arranged from inside to outside in sequence,
the core layer (1) is made of germanium-doped quartz glass with the diameter of D1Doping mol percent of germanium is 3-8 mol percent, and refractive index n is11.46 to 1.48;
the inner cladding (2) is made of phosphorus-doped quartz glass with the diameter of D2Refractive index n21.4565-1.4570;
the outer cladding layer (3) is made of phosphorus-doped quartz glass with the diameter D3Refractive index n31.4565-1.4570;
two stress regions (4) with a diameter of D are arranged in the inner cladding (2)4Respectively boron-and fluorine-doped quartz glass with refractive index n4The stress areas are 1.34-1.48, and the two stress areas (4) are symmetrically arranged on two sides of the core layer (1);
the difference n between the refractive indices of the core layer (1) and the inner cladding (2)1-n2＝0.005～0.020；
The difference n between the refractive indices of the inner cladding (2) and the stress region (4)2-n4＝0.008～0.015。
2. The multi-purpose polarization-maintaining fiber of claim 1, wherein: the boron doping mole percentage of the stress region (4) is 20-35 mol.%, the fluorine doping mole percentage is 0.5-2 mol.%, and the fluorine and boron doping mole ratio is within the range of 0.025, 0.05;
the stress zone (4) has a coefficient of thermal expansion of 1.5 x 10-5～5×10-5。
3. The multi-purpose polarization-maintaining fiber of claim 2, wherein:
the phosphorus doping molar concentration of the inner cladding (2) is 0.1-0.8 mol.%, and the softening temperature of the inner cladding (2) is 1500-1600 ℃;
the phosphorus doping molar concentration of the outer cladding layer (3) is 0.2-1.6 mol.%, and the softening temperature of the outer cladding layer (3) is 1600-1700 ℃;
the phosphorus doping molar concentration ratio epsilon (1, 2) of the inner cladding (2) and the outer cladding (3).
4. The multi-purpose polarization-maintaining fiber of claim 3, wherein:
the phosphorus doping of the inner cladding (2) is uniform doping, the phosphorus doping molar concentration of the outer cladding (3) is in a gradual change type along the radius direction, and the doping molar concentration is gradually reduced from inside to outside by taking the boundary with the inner cladding (2) as an initial point.
5. The multi-purpose polarization-maintaining fiber of claim 1, wherein: the coating layer comprises an inner coating layer (5) and an outer coating layer (6), the modulus of the inner coating layer (5) is 0.5 MPa-50 MPa, and the modulus of the outer coating layer (6) is 500 MPa-1200 MPa.
6. The multi-purpose polarization-maintaining fiber of claim 1, wherein:
diameter D of the core layer (1)1Is 4-6 μm, the diameter D of the inner cladding (2)220-120 μm, the diameter D of the outer cladding (3)360-125 μm, the diameter D of the stress region (4)412 to 50 μm.
7. A method of making the multipurpose polarization maintaining optical fiber of any one of claims 1 to 6, wherein: comprises the following steps
(1) Preparing a core rod: preparing a germanium-doped quartz preform;
(2) preparing an inner cladding layer and an outer cladding layer: the forming of the inner phosphorus-doped quartz cladding layer and the outer phosphorus-doped quartz cladding layer is completed in sequence outside the core part;
(3) preparing a stress bar: preparing a fluorine-boron co-doped quartz preform;
(4) assembling a stress rod: drilling two through holes in the inner cladding of the prefabricated rod prepared in the step (2), respectively plugging two stress rods prepared in the step (3) into the through holes, wherein the two stress rods are symmetrically arranged relative to the core rod;
(5) drawing the prefabricated rod into a quartz optical fiber;
(5) and coating and curing the quartz optical fiber to form a coating layer.
8. The method of claim 7, wherein:
step (1) adopts a mode of vapor deposition in a tube to carry out in-tube deposition of germanium-doped quartz material, uses lathe oxyhydrogen flame as a heating source, and introduces SiCl into the tube4And GeCl4Silicon dioxide and germanium dioxide particles generated by reaction in the tube are deposited on the inner wall of the tube by utilizing the thermophoresis principle and are vitrified at the same time, and the tube is collapsed into a solid core rod after the deposition is finished.
9. The method of claim 7, wherein:
step (2) adopting an external vapor deposition mode to carry out SiCl reaction by an oxyhydrogen flame torch4、POCl3Spraying raw material steam onto the rotating core rod, reacting in oxyhydrogen flame to generate submicron-grade phosphorus-containing quartz particles, depositing on the surface of the core rod to form the inner and outer claddings of the core rod, and controlling POCl in the deposition process3And SiCl4To adjust the doping concentration of phosphorus to prepare an inner cladding and an outer cladding on the outer layer of the core rod.
10. The method of claim 7, wherein:
step (3) adopting a mode of vapor deposition in the tube to carry out in-tube deposition of the fluorine-doped and boron-doped quartz material, utilizing lathe oxyhydrogen flame as a heating source, and introducing SF into the tube6、BCl3、SiCl4Reacting in the tube to generate silicon dioxide particles containing boron and fluorine, depositing on the inner wall of the tube and vitrifying at the same time, and collapsing into a solid core rod after the deposition is finished, wherein the solid core rod is a stress rod; the refractive index of the stress region can be reduced by fluorine and boron, the thermal expansion coefficient of fluorine is smaller than that of boron, and the refractive index and the thermal expansion coefficient of the stress rod are balanced by adjusting the proportion of fluorine to boron.
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| CN114751638A (en) * | 2022-06-13 | 2022-07-15 | 武汉长进激光技术有限公司 | Panda type elliptical core few-mode erbium-doped optical fiber and preparation method thereof |
| CN115417591A (en) * | 2022-09-14 | 2022-12-02 | 武汉长盈通光电技术股份有限公司 | Method for preparing polarization maintaining optical fiber stress rod by FCVD |
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| CN113213768A (en) * | 2021-04-07 | 2021-08-06 | 华南理工大学 | Glass for fiber core and application |
| CN113866867A (en) * | 2021-09-02 | 2021-12-31 | 烽火通信科技股份有限公司 | Dispersion compensation optical fiber and preparation method thereof |
| CN114751638A (en) * | 2022-06-13 | 2022-07-15 | 武汉长进激光技术有限公司 | Panda type elliptical core few-mode erbium-doped optical fiber and preparation method thereof |
| CN115417591A (en) * | 2022-09-14 | 2022-12-02 | 武汉长盈通光电技术股份有限公司 | Method for preparing polarization maintaining optical fiber stress rod by FCVD |
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Effective date of registration: 20211108 Address after: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Applicant after: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Address before: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Applicant before: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Applicant before: WUXI FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Applicant before: FASTEN GROUP Co.,Ltd. |