CN110746109A - Preparation method of polarization maintaining optical fiber - Google Patents
Preparation method of polarization maintaining optical fiber Download PDFInfo
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- CN110746109A CN110746109A CN201910908148.8A CN201910908148A CN110746109A CN 110746109 A CN110746109 A CN 110746109A CN 201910908148 A CN201910908148 A CN 201910908148A CN 110746109 A CN110746109 A CN 110746109A
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
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- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01853—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01861—Means for changing or stabilising the diameter or form of tubes or rods
- C03B37/01869—Collapsing
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02709—Polarisation maintaining fibres, e.g. PM, PANDA, bi-refringent optical fibres
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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
- C03C13/045—Silica-containing oxide glass compositions
- C03C13/046—Multicomponent glass compositions
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/14—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with boron and fluorine
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/20—Doped silica-based glasses doped with non-metals other than boron or fluorine
- C03B2201/28—Doped silica-based glasses doped with non-metals other than boron or fluorine doped with phosphorus
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/12—Non-circular or non-elliptical cross-section, e.g. planar core
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
- C03B2203/302—Non-circular core cross-sections
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/32—Eccentric core or cladding
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Abstract
A method for preparing a polarization maintaining optical fiber specifically comprises the following steps: 1) manufacturing a polarization maintaining rod, wherein the polarization maintaining rod sequentially comprises a fiber core, an inner cladding, a stress layer, an outer cladding and a base tube layer from inside to outside; 2) manufacturing a sleeve rod outside the polarization maintaining rod to obtain a finished product optical rod; 3) and drawing the finished optical rod into an optical fiber. According to the preparation method of the polarization maintaining optical fiber, the diameter of the whole finished optical rod is increased through the arrangement of the two layers of the sleeve and the base tube, so that the wire drawing length is increased, and the birefringence effect can be ensured due to the arrangement of the stress layer. And the comprehensive properties of the optical fiber such as temperature adaptability, bending resistance, mechanical strength and the like are ensured.
Description
Technical Field
The invention relates to a preparation method of a polarization maintaining optical fiber.
Background
Polarization maintaining fiber is also called polarization maintaining fiber, and is one of special optical fibers. It has wide application in the field of wavelength division multiplexing communication systems and optical fiber sensors. Particularly in the field of optical fiber sensors, the optical fiber sensor is a core sensing element component of military sensors such as an optical fiber gyroscope, an optical fiber hydrophone, an optical integrated device and the like.
There are four types of polarization maintaining optical fibers that are commercially available internationally, depending on their cross-sectional structure, namely: panda type, bow tie type (straight type), oval jacket type, and oval core type. The first three types are stress-induced and the latter type are shape-determining.
The stress-induced polarization-maintaining rod is generally manufactured by doping or placing some substance with a high expansion coefficient, such as boron, aluminum, germanium, etc., around the core, and by using a special treatment means, the doped or placed region becomes a non-circularly symmetric stress action region.
Since the expansion coefficient of boron is greater than that of silicon and even greater than that of germanium, the stress action zone can generate tensile stress on the core layer and the inner cladding layer in the cooling process after the boron is doped and the rod is collapsed and the cooling process of the fiber after drawing. Since the stress-acting region is anisotropic, the core layer is subjected to different stresses along different radial directions of the optical fiber, resulting in different refractive indices of the core layer in different radial directions, which is a so-called birefringence phenomenon. When light propagates through such an optical fiber, the propagation speed in each direction is also different, and a corresponding fast axis and a corresponding slow axis are formed.
Linearly polarized light is injected into one axis of the core layer of the polarization maintaining optical fiber, and the polarization state of the linearly polarized light can be basically maintained after a transmission distance. The fast and slow axes generally coincide with the long and short axes of the stress application zone. The parameter characterizing the polarization maintaining performance is the polarization crosstalk or extinction ratio. The smaller the polarization crosstalk (generally a negative number), the larger the absolute value of the polarization crosstalk, the better the performance of the fiber in polarization maintenance.
Because the transmission of optical energy in the optical fiber is not limited to the core layer, a part of optical power is transmitted in the inner cladding layer adjacent to the core layer, and the attenuation of boron in the working wavelength (1200nm-1600nm) interval of the quartz optical fiber is very large, the inner cladding layer is generally introduced into several stress-induced polarization-maintaining optical fibers, so that the attenuation of the optical fiber can be greatly reduced, and the attenuation level of the optical fiber can reach the applicable level lower than 2.0 dB/km.
In order to meet the use requirements of sensors such as fiber optic gyroscopes, the general panda-type and bow-tie-type polarization-maintaining optical fibers have the stress action area accounting for more than 10% of the cross-sectional area of the optical fiber, and the proportion of some products even exceeds 15%. The stress action area is often doped with expensive substances such as boron, and the stress action area is too large, so that the manufacturing cost is obviously increased, and the manufacturing difficulty is increased. In addition, the excessive area of the stress action zone causes problems in the use properties of the polarization maintaining optical fiber, such as environmental temperature adaptability, bending resistance, mechanical strength, etc., and the comprehensive properties of the polarization maintaining optical fiber are not good.
Stress rods in stress action areas of the panda-type polarization maintaining rods are independently manufactured, the size of the stress rods is determined according to design requirements, and the wire drawing length of a single rod can be about 50-80 KM. For example, Chinese patent No. CN1329754C, entitled "I" -shaped polarization maintaining optical fiber and its production method, discloses a "I" -shaped polarization maintaining optical fiber and its production method, the outer diameter of the polarization maintaining rod produced by the method is 16-18mm, the effective length of the drawable fiber is about 15KM, the consistency of the optical fiber can not be effectively ensured due to the short effective length, which is the disadvantage of other one-time forming polarization maintaining rods. The one-time forming polarization-maintaining rod has the defects that the stress area cannot be increased due to the larger area CAS of the base pipe and the difficult deformation, and the core diameter design is limited, so that the effective length of wire drawing is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a polarization maintaining optical fiber which improves the drawing length of the optical fiber under the condition of ensuring the double refraction performance of the optical fiber.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for preparing a polarization maintaining optical fiber is characterized by comprising the following steps: the method specifically comprises the following steps:
1) manufacturing a polarization maintaining rod, wherein the polarization maintaining rod sequentially comprises a fiber core, an inner cladding, a stress layer, an outer cladding and a base tube layer from inside to outside;
2) manufacturing a sleeve rod outside the polarization maintaining rod to obtain a finished product optical rod;
3) and drawing the finished optical rod into an optical fiber.
Preferably, the manufacturing of the polarization maintaining rod in the step 1) specifically includes:
1.1 base pipe pretreatment;
1.2 carrying out deposition of each layer in the base pipe;
1.3, carrying out forward collapse and reverse collapse on the base pipe to enable the stress layer to be extruded and deformed, and manufacturing a solid polarization-maintaining rod;
and 1.4, polishing the polarization maintaining rod to prepare the polarization maintaining rod.
Preferably, the manufacturing of the sleeve outside the polarization maintaining rod in the step 2) is performed to manufacture a finished optical rod, which specifically comprises:
2.1 connecting a polarization maintaining rod to the first handle and pickling the cleaning surface;
2.2 connecting the sleeve with a second handle, and cleaning the inner surface and the outer surface by acid washing;
2.3 fixing and straightening the first end of the polarization maintaining rod;
2.4 fixing and straightening the second end of the sleeve;
2.5 inserting the polarization-maintaining rod into the sleeve, and sealing the cone at the end face;
2.6, pumping negative pressure between the sleeve and the polarization maintaining rod;
2.7, the sleeve and the polarization-maintaining rod are collapsed into a solid rod body;
2.8 polishing, and polishing the solid rod body into a finished product optical rod.
Preferably, in step 1.2, the specific deposition process sequentially includes outer cladding deposition, stress layer deposition, inner cladding deposition and core deposition.
Preferably, after the stress layer deposition step and before the inner cladding layer deposition step, a directional etching step is further performed, so that the stress layer is not completely etched through.
Preferably, the directional etching step is that the base pipe is fixed, corrosive gas containing fluorine is introduced into the base pipe, and the base pipe is etched by moving back and forth along the axial direction of the base pipe with fire.
Preferably, in step 1.3, the number of times of forward collapsing is 4-6, and after forward collapsing, the reverse collapsing is performed.
Preferably, in the above steps 2.6 and 2.7, the range of the negative pressure is 50mbar to 200mbar, and the moving speed of the collapsed lamp head is 5mm/min to 10 mm/min.
Compared with the prior art, the preparation method of the polarization-maintaining optical fiber has the advantages that the preparation method comprises the steps of separately manufacturing the core rod and the sleeve, combining the core rod and the sleeve into a whole after separately manufacturing, ensuring the effect of stress deflection by the stress zone of the core rod, enabling the birefringence effect to meet the requirement, and increasing the overall diameter through the sleeve, thereby greatly increasing the drawing length of the optical fiber.
Drawings
FIG. 1 is a schematic diagram of a process for preparing a polarization maintaining optical fiber according to the present invention.
FIG. 2 is a schematic cross-sectional view of a polarization maintaining optical fiber prepared by the preparation method of the present invention.
FIG. 3 is a schematic diagram of a sleeve and a polarization maintaining rod.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawing, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 2, the optical fiber prepared by the preparation method of the embodiment of the present invention specifically includes a central fiber core 1, an inner cladding 2 surrounding the fiber core 1, and a stress layer 3 disposed outside the inner cladding 2, where the stress layer 3 is a straight-line shape, i.e., a rectangle, and the width of the stress layer 3 is smaller than the diameter of the inner cladding 2, the length of the stress layer 3 is greater than the diameter of the inner cladding 2, an outer cladding 4 matched with the overall shape of the stress layer and the inner cladding is disposed on the outer sides of the stress region and the inner cladding, the outer side of the outer cladding 4 is a base tube layer 5, the outer shape of the base tube layer 5 is circular, and an annular sleeve layer 6 is disposed on the outer side of. The base tube layer 5 is made of silicon dioxide, the outer cladding layer 4 is made of silicon dioxide doped with phosphorus and fluorine, the stress layer is made of silicon dioxide doped with germanium, boron and the like, the inner cladding layer is made of silicon dioxide doped with germanium and fluorine, and the fiber core is made of silicon dioxide doped with germanium.
As shown in fig. 1, a flow chart of a process for manufacturing a polarization maintaining optical fiber according to an embodiment of the present invention is roughly divided into three major parts, a first part is a process for manufacturing a polarization maintaining rod, a second part is a process for manufacturing a rod sleeve outside the polarization maintaining rod to manufacture a finished optical rod, and a third part is a process for drawing the finished optical rod to form an optical fiber.
Wherein the first part, the preparation of polarization maintaining rod specifically includes:
1.1, pretreating a base pipe, for example, in the embodiment, the base pipe is selected to have an outer diameter phi of 30mm, an inner diameter phi of 26mm, and a cross-sectional area (cas) of 175mm2(ii) a The pretreatment of the substrate tube is to preheat the substrate tube and effectively eliminate impurities and bubbles on the inner wall of the substrate tube.
1.2, depositing each layer in the substrate tube, wherein in the embodiment of the invention, as shown in FIG. 1, the specific deposition procedures are outer cladding deposition, stress layer deposition, inner cladding deposition and fiber core deposition in sequence. After the deposition process of the stress layer is finished, directional etching is carried out, so that the stress layer on the inner side of the base tube at the heated position is gradually etched, the stress layer at the position is not completely etched, a certain thickness is reserved in a stress action area at the position, and the stress layer deposited in the base tube is not completely separated. Wherein, the directional etching is to make the base pipe not rotate, and the base pipe is internally communicated with corrosive gas containing fluorine; one fire head or two fire heads burning oppositely on two sides outside the base pipe move back and forth along the axial direction of the base pipe.
Specifically, this etching process uses the oxyhydrogen metal lamp holder that sets up at the parent tube both ends symmetry, adjusts the 1/4 that the sculpture facula size is the parent tube diameter through adjusting oxyhydrogen flow and translation rate. The heat source is generated by etching the lamp holder, and SF is introduced into the tube6And carrying out corrosion reaction on the inner wall of the tube, and gradually etching the stress layer until the stress layer is completely separated into two parts. ByThe etching of the lamp caps on both sides cannot be completely consistent, and in order to ensure the symmetry of the etching, the etching is divided into a plurality of times, the lamp caps are turned over by 180 degrees every time, and the other side of the base tube is etched.
And 1.3, carrying out forward collapse and reverse collapse on the base pipe, and extruding and deforming a stress area by changing collapse pressure and collapse speed so as to manufacture a solid linear polarization maintaining rod. Specifically, the forward collapse speed is 10mm/min-20mm/min, and H2The flow rate is 140-200s/m, the times are 4-6, the reverse collapse speed is 4-10 mm/min, H2The flow rate is 150s/m-200s/m, and the times are 1.
Wherein, the positive collapse is realized by adjusting the collapse pressure within the range of 0.5to 0.1tor and the collapse speed within the range of 20 to 5mm/min, the tube diameter is reduced to 18.0 to 18.2mm in the first collapse, 16.5 to 16.7mm in the second collapse and 15.6 to 15.9mm in the third collapse. If the pipe diameter of the third time is larger, the number of collapse times is increased for 1-2 times, the last time is controlled to be 15.6-15.9 mm, and finally, a solid rod is formed by one time of reverse collapse, so that the stress area is extruded and deformed to form a solid linear polarization-maintaining rod.
And 1.4, polishing the polarization maintaining rod to obtain a quartz transparent linear polarization maintaining rod 10.
And in the second part, sleeve rod manufacture of the sleeve is carried out outside the polarization maintaining optical rod to manufacture a finished optical rod, and the method specifically comprises the following steps:
2.1 connecting the polarizing rod to the first handle 7 and pickling the cleaned surface. Specifically, the materials are soaked in HF acid with the concentration of 20% for 3 hours and then are washed clean by deionized water.
2.2, connecting the sleeve with a second handle 8, and cleaning the inner surface and the outer surface by acid washing; specifically, the acid is washed in a tube washing machine with 40% HF concentration.
And 2.3, fixing the first end of the polarization maintaining rod and straightening the polarization maintaining rod. Specifically, a first end handle 7 of the polarization maintaining rod is clamped on a fixed end chuck of a sleeve lathe and is straightened, and after straightening, a run-out value is controlled within a range of 0.1 mm.
2.4, the second end of the sleeve pipe far away from the polarization maintaining rod is fixed and aligned, specifically, the second end of the sleeve pipe far away from the polarization maintaining rod is clamped on a movable end clamping disc of a sleeve pipe lathe and fixed, and is aligned, and the runout of the sleeve pipe after being aligned is controlled within a 0.1mm range, so that the sleeve pipe and the polarization maintaining rod are concentrically and coaxially arranged.
2.5, inserting the polarization maintaining rod into the sleeve, and tapering the end face. Specifically, the movable end is moved to enable the optical rod to be inserted into the sleeve until the outer end face of the sleeve is located at the joint of the optical rod and the first handle, and the sleeve is sealed to be tapered, so that the end face of the sleeve and the optical rod are fused together and the sleeve is prepared for vacuumizing.
And 2.6, vacuumizing, namely vacuumizing between the polarization maintaining rod and the sleeve, wherein the range of the negative pressure is 50mbar-200mbar, and preferably, vacuumizing is 100 mbar.
2.7, collapsing to form a solid rod body, wherein the moving speed of the lamp head is 5mm/min-10mm/min and H is H within the range of negative pressure value of 50-200mbar2The flow rate is 140m/s-180 m/s.
And 2.8, polishing the solid rod body to form a finished product optical rod.
Third, drawing
3.1, the finished optical rod is thinned into a quartz optical fiber, for example, the quartz optical fiber can be thinned into 80 um.
And 3.2, coating a protective coating, such as an acrylic ester coating, on the outer surface of the optical fiber.
And 3.3, carrying out ultraviolet curing treatment to obtain the 80um straight polarization maintaining optical fiber.
In the above embodiment, the base pipe has a cross-sectional area of 100mm2-200mm2The cross-sectional area of the sleeve is 250mm2-300mm2. Moreover, as can be understood by those skilled in the art, the preparation method can be used for manufacturing not only the linear polarization maintaining fiber, but also the elliptical polarization maintaining fiber and the panda-type polarization maintaining fiber.
In the above embodiments, the main specifications of the polarization maintaining fiber are shown in the following table.
According to the preparation method of the polarization maintaining optical fiber, the diameter of the whole finished optical rod is increased through the arrangement of the two layers of the sleeve and the base tube, so that the wire drawing length is increased, and the birefringence effect can be ensured due to the arrangement of the stress layer. And the comprehensive properties of the optical fiber such as temperature adaptability, bending resistance, mechanical strength and the like are ensured.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for preparing a polarization maintaining optical fiber is characterized by comprising the following steps: the method specifically comprises the following steps:
1) manufacturing a polarization maintaining rod, wherein the polarization maintaining rod sequentially comprises a fiber core (1), an inner cladding (2), a stress layer (3), an outer cladding (4) and a base tube layer (5) from inside to outside;
2) manufacturing a sleeve rod outside the polarization maintaining rod to obtain a finished product optical rod;
3) and drawing the finished optical rod into an optical fiber.
2. The method of making a polarization maintaining optical fiber of claim 1, wherein: the manufacturing of the polarization maintaining rod in the step 1) specifically comprises the following steps:
1.1 base pipe pretreatment;
1.2 carrying out deposition of each layer in the base pipe;
1.3, carrying out forward collapse and reverse collapse on the base pipe to enable the stress layer to be extruded and deformed, and manufacturing a solid polarization-maintaining rod;
and 1.4, polishing the polarization maintaining rod to prepare the polarization maintaining rod.
3. The method of making a polarization maintaining optical fiber of claim 1, wherein: in the step 2), sleeve rod manufacturing is performed outside the polarization maintaining rod to manufacture a finished product optical rod, which specifically comprises:
2.1 connecting a polarization maintaining rod to the first handle and pickling the cleaning surface;
2.2 connecting the sleeve with a second handle, and cleaning the inner surface and the outer surface by acid washing;
2.3 fixing and straightening the first end of the polarization maintaining rod;
2.4 fixing and straightening the second end of the sleeve;
2.5 inserting the polarization-maintaining rod into the sleeve, and sealing the cone at the end face;
2.6, pumping negative pressure between the sleeve and the polarization maintaining rod;
2.7, the sleeve and the polarization-maintaining rod are collapsed into a solid rod body;
2.8 polishing, and polishing the solid rod body into a finished product optical rod.
4. The method of claim 2, wherein: in the step 1.2, the specific deposition process sequentially comprises outer cladding deposition, stress layer deposition, inner cladding deposition and fiber core deposition.
5. The method of claim 4, wherein: after the stress layer deposition process and before the inner cladding deposition process, the method also comprises a directional etching step so that the stress layer is not completely etched through.
6. The method of claim 4, wherein: the directional etching step is that the base pipe is fixed, corrosive gas containing fluorine is introduced into the base pipe, and the base pipe is etched by fire moving back and forth along the axial direction of the base pipe.
7. The method of claim 2, wherein: in the step 1.3, the number of times of forward collapse is 4-6, and after forward collapse, the reverse collapse is performed.
8. The method of claim 2, wherein: in the above steps 2.6 and 2.7, the range of the negative pressure is 50mbar-200mbar, and the moving speed of the collapsed lamp head is 5mm/min-10 mm/min.
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| CN (1) | CN110746109A (en) |
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| CN111620558A (en) * | 2020-04-22 | 2020-09-04 | 无锡法尔胜光电科技有限公司 | Method for manufacturing elliptical core polarization maintaining optical fiber |
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