CN107311445B - Polarization maintaining optical fiber preform - Google Patents
Polarization maintaining optical fiber preform Download PDFInfo
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- CN107311445B CN107311445B CN201710690032.2A CN201710690032A CN107311445B CN 107311445 B CN107311445 B CN 107311445B CN 201710690032 A CN201710690032 A CN 201710690032A CN 107311445 B CN107311445 B CN 107311445B
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- C—CHEMISTRY; METALLURGY
- 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
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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
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Abstract
The invention relates to a polarization maintaining optical fiber preform rod, which comprises a drawing pre-tapering variable-diameter deformation section, wherein the topmost part of the drawing pre-tapering variable-diameter deformation section is provided with an opening, so that closed heated gas can be released in the process of drawing and turning around, the expansion and bubbling of the head end are prevented, and the drawing technical process of double symmetrical holes is realized. Simultaneously the prefabricated stick includes tail pipe extension flaring wire drawing clamping section, carry out the flaring through the tail end to extending the tail pipe section, can carry out the reducing design to the tail end of extending the tail pipe, thereby realize the clamping function of its wire drawing in-process and the clamping function that hangs among the washing drying process, optimize the circulation handling capacity of each process, ensure hanging, the washing, operating procedure such as wire drawing centre gripping, do not arouse wire drawing effective area's damage and pollution, still need design dull polish heat dissipation section near the tail end of extending the tail pipe section, at the in-process of wire drawing centre gripping, carry out the separation with the high temperature heat in the wire drawing furnace, prevent that chuck part heat conduction is overheated, damage control unit.
Description
Technical Field
The invention relates to a polarization maintaining optical fiber preform rod, and belongs to the technical field of optical fibers.
Background
The polarization maintaining optical fiber is used for transmitting linearly polarized light, is widely applied to various fields of national economy such as aerospace, aviation, navigation, industrial manufacturing technology, communication and the like, and can ensure that the linear polarization direction is unchanged and improve the coherent signal-to-noise ratio in an interference optical fiber sensor based on optical coherent detection so as to realize high-precision measurement of physical quantity; the polarization maintaining fiber is used as a special fiber, is mainly applied to sensors such as fiber current transformers, 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. The stress double refraction polarization maintaining fiber mainly comprises a bow tie type polarization maintaining fiber, a panda type polarization maintaining fiber and an elliptical cladding type polarization maintaining fiber. The panda type polarization maintaining fiber is most widely used, and the structure of the polarization maintaining fiber comprises a fiber core, a stress area and a cladding part, wherein the fiber core is positioned in the central part of the cladding, and two cylindrical stress areas are distributed on two sides of the fiber core, so that the polarization maintaining fiber has linear polarization maintaining performance due to the so-called stress birefringence. In design, the birefringence performance of the polarization maintaining fiber is mainly adjusted by changing the structures and the stress doping of two symmetrical cylindrical stress regions.
In chinese patent 201610412177.1, a method for preparing a polarization maintaining optical fiber is described, wherein a prefabricated mold is used for injecting silica liquid to obtain a quartz half-cut sleeve, and then mixed powder of silica and boron trioxide is injected to form a panda-type polarization maintaining optical fiber preform by polishing and melting; the specific design structure and dimensional parameters of the preform are not described in detail, nor is a shaped preform directly available for drawing. In chinese patent 201610457293.5, a preparation method of panda polarization maintaining optical fiber preform is described, nano-porous silica powder is added into rare earth and co-doped ion inorganic salt solution to form suspension, and no specific molding preform parameters and available drawing preform are provided. In chinese patent 201610599525.0, an oval core panda polarization maintaining fiber and a method for making the same are described, wherein a preform is shaped by flat polishing and stretching, the structural design and parameter design in the radial direction of the preform are not specified in detail yet, and this design has a critical influence on the subsequent fiber stretching. In chinese patent 201310658276.4, a device and a method for manufacturing a polarization maintaining optical fiber preform are described, in which a design device is used to assemble and fix the preform, and an external spraying method is also used to manufacture a panda polarization maintaining optical fiber preform, rather than a prefabricated hole drilling method, to design and manufacture the preform. Chinese patent 201510017430.9 describes a method for manufacturing polarization maintaining optical fiber, but only the structural design of the bow-shaped polarization maintaining optical fiber is described, and a non-circular assembly structure is adopted for splicing, so that a relatively large gap exists. Chinese patent 200410012671.6 describes a method for manufacturing a polarization maintaining optical fiber, mainly describing a method for assembling a panda type polarization maintaining optical fiber preform, adopting a square core design, and hardly keeping a stress structure design at a round and square joint surface; and also does not describe detailed structural design parameters of the preform. Chinese patent 200810197409.1 describes a method for manufacturing a polarization maintaining optical fiber, which mainly describes that the excircle of a panda type polarization maintaining optical fiber perforated preformed rod is trimmed, so that the clearance between a stress rod and a hole can be compensated through the trimming of the excircle, thereby ensuring the out-of-roundness of the cladding of the polarization maintaining optical fiber and simultaneously ensuring that the mechanical strength is not deteriorated; the process of drawing, extending and tapering the preform rod is not described, and a method for solving the optimization of the out-of-roundness of the cladding of the optical fiber cannot be provided from the process design, so that the manufacturing procedures are increased, and the quality control risk is improved.
Disclosure of Invention
The invention aims to overcome the defects and provide a polarization maintaining optical fiber preform, which can meet the design requirement of the structural performance of panda type polarization maintaining optical fibers on one hand, and can carry out complete design of detailed radial structure and size parameters of the preform aiming at a specific optical fiber drawing link so as to optimize the design of an integrally formed preform and finish the realization of drawing optical fiber parameters on the other hand. The finished product of the prefabricated rod can be directly used for producing and drawing panda type polarization maintaining optical fibers, so that the degradation of out-of-roundness of an optical fiber cladding, structural deformation and operation implementation limitation in the drawing process are avoided, the parameter index requirement of the drawn optical fibers is met, and the production yield of the drawn prefabricated rod is improved.
The purpose of the invention is realized by the following steps:
a polarization maintaining optical fiber preform comprises a punching and wiredrawing fiber forming section, an extension tail pipe section, a wiredrawing clamping section of a tail pipe extension flaring, and a wiredrawing pre-tapering and diameter-changing deformation section;
the hole-punching and fiber-drawing section comprises a fiber core and a cladding part, wherein the cladding part is coated on the periphery of the fiber core, and symmetrical double holes are also arranged in the cladding part and are symmetrically arranged relative to the fiber core;
extend the tail pipe section and locate the wire drawing fiber forming section rear portion that punches, extend the tail pipe section and be parallel with the wire drawing fiber forming section that punches, wire drawing centre gripping section is the tail end partly of extending the tail pipe section, and wire drawing centre gripping section is the loudspeaker form, and its outside aperture is greater than inboard bore, the deformation section of tapering reducing is the head end partly of the wire drawing fiber forming section that punches in advance for the wire drawing, and the deformation section is the loudspeaker form, and its outside aperture is less than inboard bore, and the top conical head of deformation section adopts the open design, and its surface is diplopore open face, extends the tail pipe section in addition and still is equipped with dull polish heat dissipation section near tail end department.
The diameter D6 of the top end of the conical deformation area of the deformation section belongs to the field of (1mm, 12mm), the transition length L6 of the conical deformation area of the deformation section belongs to the field of (40mm, 80mm), the conical head at the topmost end of the deformation section adopts an opening design, and the diameter D8 of the opening surface of the symmetrical double holes belongs to the field of (1mm, 5mm).
The diameter D5 epsilon (32mm, 65mm) of the flaring tail end of the wire drawing clamping section.
The length L7 of the frosted heat dissipation section belongs to the group of 10mm and 200mm, and the distance L57 of the center point of the frosted heat dissipation section and the tail end of the tail pipe extending flaring wire drawing clamping section belongs to the group of 200mm and 500mm.
The pipe inner diameter D4E (22mm, 58mm) of the extension tail pipe section, the length L4E (300mm, 800mm), the pipe outer diameter of the extension tail pipe section is consistent with the size of the long rod outer diameter D1 of the prefabricated rod wire-drawing and punching fiber-forming section, and D1E (30mm, 60mm).
The diameter D2 of the fiber core belongs to the field of (1mm, 5mm), the length L1 belongs to the field of (200mm, 600mm), the diameter D3 of the symmetrical double holes belongs to the field of (10mm, 20mm), the inner distance T2 of the symmetrical double holes belongs to the field of (1.5mm, 10mm), and the distance T3 of the outer circle of the fiber drawing section (101) and the outer circle of the symmetrical double holes belongs to the field of (2mm, 5mm).
And the extension tail pipe section is heated by flame or an electric furnace or plasma and is butted with the perforated and wire-drawn fiber forming section, and the extension tail pipe section and the perforated and wire-drawn fiber forming section are fused together to form an integrated forming prefabricated rod structure.
And the wire drawing clamping section heats the tail end through a heat source, and then adopts a mechanical flaring mode to realize tail end flaring and clamp the prefabricated rod for wire drawing.
The head end of the deformation section is heated by a heat source, and the deformation structure of the preformed taper reducing section is formed by adopting a melting and extending method, so that the double-hole wire drawing reducing design is realized.
Compared with the prior art, the invention has the beneficial effects that:
1. the head end of the prefabricated rod punching and wire drawing fiber forming section adopts a preformed cone diameter-reducing processing design, the prefabricated rod to be drawn into the optical fiber is subjected to head end symmetrical double-hole extension preformed cone design processing, so that the diameter-reducing area of the wire drawing prefabricated rod is preformed in shape, the punching and rod inserting wire drawing section of the symmetrical double-hole double-insertion stress rod at the rear end is guided to deform and reduce according to the preformed cone shape design, the cladding out-of-roundness parameter of the wire drawing formed optical fiber is optimized, and the structural shape of the optical fiber with high quality cladding out-of-roundness is achieved under the condition of no shaping;
2. the head end of the prefabricated rod punching and wire drawing fiber forming section adopts a preformed taper and diameter reducing processing design, and the position of the stress rod with double jacks is fixed through the shape proportion design of the diameter reducing deformation, so that the displacement or falling of the stress rod in the wire drawing and turning process is prevented, and the shape design of the polarization maintaining optical fiber is maintained;
3. the head end of the prefabricated rod punching and drawing fiber forming section adopts a preformed cone diameter-reducing processing design, and the opening design of the top end of the diameter-reducing deformation ensures that the whole symmetrical double holes penetrate through the whole prefabricated rod, so that the smoothness of air flow is formed, in the stage of drawing and falling the cone, along with the continuous rise of the temperature of the prefabricated rod in a drawing furnace, an expansion channel of heated gas is opened, the expansion pressure is released, the position fixation of a stress rod of a double-jack by a bubbling explosion cone is prevented, the displacement or the falling of the stress rod in the process of drawing and falling the head is prevented, and the shape design of the polarization-preserving optical fiber is kept;
4. the extension tail pipe section of prefabricated stick uses heat sources such as flame, electric stove, plasma heating with the fiber forming section that punches to dock, ensures the firm of wire drawing operation process, and the tail end of extension tail pipe section has taken the design of flaring, through the size structural design of flaring tail end for whole wire drawing shaping prefabricated stick can compress tightly, hang upside down etc. operation at pickling, alkali wash, dry in-process, and does not harm and pollute the effective wire drawing part of the wire drawing section that punches. In the process of wire drawing, the clamping rod can clamp the flaring end, so that the clamping rod cannot be clamped due to overlarge self weight in the process of wire drawing of the large-size double-hole preform.
5. The design of flaring and heat dissipation dull polish section has been taken to the tail end of prefabricated excellent extension tail pipe section, through the setting of length, distance etc. of heat dissipation dull polish section, can avoid clamping device's heat conduction, prevents that the high temperature in the wire drawing stove from conducting to clamping device on, has avoided electric control device's thermal ageing, has also prevented the thermal ageing of intraductal sealing rubber circle.
6. The fiber-drawing preformed rod described by the invention can completely realize the fiber-drawing process of the whole polarization-maintaining optical fiber, optimize the geometric and mechanical strength performances of the drawn optical fiber, such as cladding non-circularity, screening strength, fiber-drawing breakage rate and the like, and simultaneously ensure the polarization performance of the polarization-maintaining optical fiber.
Drawings
FIG. 1 is a schematic view of the overall structure of a polarization maintaining optical fiber preform according to the present invention.
FIG. 2 is a schematic drawing of the side view of the tail end of a preform rod formed by drawing a polarization maintaining optical fiber according to the present invention.
FIG. 3 is a side view of the end of a preform for a polarization maintaining fiber draw.
Wherein: the drawing structure comprises a hole-punched drawing fiber section 101, a fiber core 102, a symmetrical double hole 103, an extension tail pipe section 104, a drawing clamping section 105, a deformation section 106, a heat dissipation frosted section 107, a double-hole opening surface 108 and a cladding part 109.
Detailed Description
Referring to fig. 1 to 3, the present invention provides a polarization maintaining optical fiber preform, which includes a perforated fiber-drawing segment 101, an extended tail tube segment 104, a tail tube extended flared fiber-drawing clamping segment 105, and a fiber-drawing pre-tapering deformation segment 106.
The punching and drawing fiber forming section 101 is a drawing main body of a panda type polarization maintaining fiber drawing forming preform, the main body section can be drawn into a panda type polarization maintaining fiber, the punching and drawing fiber forming section 101 comprises a fiber core 102 and a cladding part 109, the cladding part 109 is coated on the periphery of the fiber core 102, symmetrical double holes 103 are further arranged in the cladding part 109, the symmetrical double holes 103 are symmetrically arranged relative to the fiber core 102, the fiber core 102 is a doped quartz core layer, double-symmetrical punching is carried out on a polarization maintaining fiber mother rod, a panda type structure is realized, a designed stress rod is inserted into the mother rod, and the structural design of the panda type polarization maintaining fiber stress type fiber can be realized.
The drawing tail pipe section 104 is arranged at the rear part of the punching and drawing fiber forming section 101, the extending tail pipe section 104 is parallel to the punching and drawing fiber forming section 101, the extending tail pipe section 104 is in butt joint with the punching and drawing fiber forming section 101 by using heat sources such as flame, an electric furnace, plasma heating and the like, and is fused together to form an integrated forming prefabricated rod structure, a drawing clamping section 105 of tail pipe extending flaring is a part of the tail end of the extending tail pipe section 104, the drawing clamping section 105 of tail pipe extending flaring is horn-shaped, the outside caliber of the drawing clamping section is larger than the inside caliber, tail end heating is carried out by the heat source, then a mechanical flaring mode is adopted to realize tail end flaring, the function of drawing the prefabricated rod is clamped, the deformation section 106 of the drawing pre-tapering is a part of the head end of the punching and drawing fiber forming section 101, the deformation section 106 of the drawing pre-tapering is horn-shaped, the outside caliber is smaller than the inside caliber, head end heating is carried out by using a melting and extending method to carry out the deformation structure of the drawing pre-tapering section, thereby realizing the design of double-tapering and ensuring that the proportion meets the process requirements, reducing process, reducing the geometric deformation of the drawing fiber prefabricated fiber forming section 106, optimizing the drawing fiber, and the drawing fiber forming section of the drawing fiber, and the double-drawing fiber.
Wherein the design of pre-coning reducing is carried out to the head end of the perforated wiredrawing fiber-forming section 101 in the deformation section 106 of the wiredrawing pre-coning reducing, the pre-design can be carried out to the process of the wiredrawing reducing of the prefabricated rod, the structural deformation degree of the double-symmetrical-hole structure is adjusted, and the deformation of the symmetrical double-hole structure caused by the surface tension in the wiredrawing process is ensured to be controlled. The design of the pre-tapering reducing can effectively realize the installation of the stress rod, the stress rod is blocked at the head end, the displacement of the stress rod in the wire drawing process is prevented, and therefore the realization of wire drawing stress birefringence is ensured. And finally, the topmost part of the deformation section 106 with the tapered diameter is designed to be provided with an opening, so that in the process of wire drawing and turning around, the gas heated by sealing at the head end of the panda type polarization maintaining optical fiber wire drawing forming preform can be released, the expansion bubbling at the head end is prevented, and the wire drawing technology process of the double symmetrical holes is realized.
The tail pipe extension flaring wire drawing clamping section 105 can perform reducing design on the tail end of the extension tail pipe through flaring design on the tail end of the extension tail pipe section 104, so that the clamping function in the wire drawing process of the extension tail pipe and the hanging clamping function in the cleaning and drying process of the extension tail pipe are realized. The circulation handling capacity of each process is optimized, and the damage and pollution to the effective drawing area of the prefabricated rod are avoided in the operation processes of suspension, cleaning, drawing clamping and the like.
In addition, the extension tail pipe section 104 is also provided with a frosted heat dissipation section 107 near the tail end, and the frosted heat dissipation section 107 is used for blocking high-temperature heat in the wire drawing furnace in the wire drawing clamping process, so that the heat conduction of the clamping head part is prevented from being overheated, and the control device is prevented from being damaged.
An extension tail pipe section 104, a tail pipe extension flaring wire drawing clamping section 105, a wire drawing pre-tapering diameter changing deformation section 106 and a frosted heat dissipation section 107 are the co-designed parts of the panda polarization maintaining optical fiber wire drawing forming preform.
The deformation section 106 is prepared by performing preformed conical diameter-reducing processing on the head end of the punching wire-drawing fiber-forming section 101, wherein the diameter D6E of the top end of a conical deformation area of the deformation section 106 is (1mm, 12mm), the transition length L6E of the conical deformation area of the deformation section 106 is (40mm, 80mm), and the conical head at the topmost end of the deformation section 106 adopts an opening design, and the diameter D8E of a symmetrical double-hole opening surface 108 is required to be (1mm, 5mm).
The tail pipe extension flaring spool clamping section 105 is manufactured by flaring the tail end of the extension tail pipe section 104, wherein the tail end diameter D5E (32mm, 65mm) of the flaring of the tail pipe extension flaring spool clamping section 105 is.
The length L7 of the frosted heat dissipation section 107 belongs to the size of 10mm and 200mm, and the distance L57 belongs to the size of the tail end of the tail pipe extending flaring wire-drawing clamping section 105.
The inner diameter D4E (22mm, 58mm) of the extending tail pipe section 104 and the length L4E (300mm, 800mm) of the extending tail pipe section 104 are consistent in size with the outer diameter D1 of the long rod of the prefabricated rod wire-drawing and punching fiber-forming section 101, D1E (30mm, 60mm) of the extending tail pipe section 104 and the hole-drawing and punching fiber-forming section 101 are butted and fused together by using heat sources such as flame, an electric furnace, plasma heating and the like to form an integrated forming prefabricated rod structure.
The diameter D2E of the fiber core 102 of the perforated and drawn fiber section 101 belongs to (1mm, 5mm), the length L1E belongs to (200mm, 600mm), the diameter D3E of the symmetrical double holes 103 belongs to (10mm, 20mm), the inner distance T2E of the double holes of the symmetrical double holes 103 of the prefabricated rod perforated and drawn fiber section 101 belongs to (1.5mm, 10mm), and the distance T3E of the outer circle of the prefabricated rod perforated and drawn fiber section 101 and the outer circle of the holes of the symmetrical double holes 103 belongs to (2mm, 5mm).
The head end of the perforated wiredrawing fiber forming section 101 is pre-tapered and variable in diameter, and the tail end of the perforated wiredrawing fiber forming section 101 is provided with a panda type polarization maintaining optical fiber wiredrawing forming prefabricated rod with a flaring and frosting design, stress rods are filled in the symmetrical double holes 103 of the perforated wiredrawing fiber forming section 101, and the stress type polarization maintaining optical fiber prefabricated rod structure is formed in the completely symmetrical inserting holes according to design requirements. And drawing to obtain the panda type polarization maintaining optical fiber finished product.
Embodiment 1 of the present invention:
the head end is preformed with taper and diameter, and the tail end is provided with flaring and frosting. The method comprises the following steps:
the diameter D6 of the top end of the conical deformation area of the drawing pre-tapering variable-diameter deformation section 106 is 6mm, the transition length L6 of the conical deformation area of the drawing pre-tapering variable-diameter deformation section 106 is 30mm, the topmost conical head of the drawing pre-tapering variable-diameter deformation section 106 is opened, and the diameter D8 of the symmetrical double-hole opening surface 108 is 2mm; the diameter D5 of the tail end of the flaring of the tail pipe extension flaring wire drawing clamping section 105 is 43mm, the length L7 of the frosted heat dissipation section 107 is 120mm, and the distance L57 between the center point of the frosted heat dissipation section 107 and the tail end of the flaring of the tail pipe extension flaring wire drawing clamping section 105 is 300mm; the inner diameter D4 of the pipe of the extending tail pipe section 104 is 36mm, the length L4 is 600mm, the outer diameter of the pipe of the extending tail pipe section 104 is consistent with the outer diameter D1 of the long rod of the prefabricated rod wire-drawing and punching fiber-forming section 101, D1 is 40mm, the wire-drawing and punching fiber-forming section 101 and the extending tail pipe section 104 are butted and fused together by using heat sources such as flame, an electric furnace, plasma heating and the like to form an integrated forming prefabricated rod structure; the diameter D2 of the fiber core 102 of the perforated and drawn fiber section 101 is 2.6mm, the length L1 is 400mm, the diameter D3 of the symmetrical double holes 103 is 13mm, the distance T22 between the inner edges of the symmetrical double holes 103 of the perforated and drawn fiber section 101 of the preform is 4mm, and the distance T31 between the outer edge of the perforated and drawn fiber section 101 of the preform and the outer edge of the symmetrical double holes 103 is 5mm.
By adopting the design structure parameters and the preparation process, the stress type polarization maintaining optical fiber prepared by wire drawing is matched with the symmetrical double insertion of the double stress rods, is a structure of the panda type polarization maintaining optical fiber, and the realized main birefringence performance, the wire drawing fiber breakage rate parameter, the screening strength, the wire drawing fiber length of a single rod and the out-of-roundness parameter of the cladding are as follows:
out-of-roundness of the cladding: 0.9 percent;
effective fiber length of single rod wire drawing: 55km;
screening strength: 100Kpsi;
polarization crosstalk: the working wavelength at 1550nm reaches-30.2 dB/km;
examples 2 to 6 of the present invention:
by adopting the preparation process and the process flow described in the embodiment 1, the structural design of the functional areas such as the head end is changed to perform pre-tapering and diameter changing, and the tail end is subjected to flaring, the panda type polarization maintaining optical fiber drawing forming preform rod of the following 5 embodiments is prepared and drawn into the panda type polarization maintaining optical fiber product, and the design structure and the realized drawing and optical fiber performance parameters are as described in the following table 1:
table 1:
| parameters of optical fiber | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 |
| The diameter D6 (mm) of the top end of the conical deformation area of the drawing pre-tapering variable-diameter deformation section (106) | 15 | 12 | 4 | 16 | 15 |
| Transition length L6 (mm) of conical deformation zone of drawing pre-tapering variable-diameter deformation section (106) | 50 | 40 | 60 | 90 | 60 |
| Diameter D8 (mm) of the symmetrical double-hole opening surface (108) | 4 | 3 | 1 | 7 | 5 |
| Tail pipe extension flaring wire drawing clamping section (105) flaring tail end diameter D5 (mm) | 53 | 59 | 32 | 65 | 62 |
| Length L7 (mm) of frosted radiating section (107) | 220 | 240 | 30 | 260 | 170 |
| The distance L57 (mm) between the center point of the frosted heat dissipation section (107) and the tail end of the flaring of the tail pipe extension flaring wire drawing clamping section (105) | 310 | 380 | 200 | 500 | 400 |
| Drawing and punching fiber forming section (101) long rod external diameter D1 (mm) | 50 | 55 | 30 | 60 | 58 |
| The diameter D2 (mm) of the core (102) of the fiber-forming section (101) for drawing holes | 3.3 | 3.6 | 1 | 5 | 4.1 |
| The length of the long rod of the fiber drawing and punching forming section (101) is L1 (mm) | 436 | 493 | 200 | 600 | 537 |
| Diameter D3 (mm) of the symmetrical double holes (103) | 16 | 18 | 10 | 20 | 19 |
| The edge distance T31 (mm) between the outer circle edge of the perforated wiredrawing fiber-forming section (101) and the outer circle edge of the symmetrical double holes (103) | 5 | 3 | 2 | 5 | 4 |
| Cladding unroundness (%) | 1.1 | 0.8 | 0.9 | 0.7 | 0.8 |
| Effective fiber length (km) of single rod drawn fiber for producing optical fiber | 96 | 112 | 49 | 143 | 131 |
| Preparation of screening Strength (Kpsi) for optical fiber | 120 | 115 | 110 | 130 | 120 |
| Polarization crosstalk of prepared optical fiber (@ 1550nm, dB, 1km) | -30.4 | -30.3 | -31.1 | -31.9 | -31.6 |
Table 1 shows examples 2 to 6, in which five structural designs of pre-tapering and reducing at different head ends and flaring at the tail end are adopted, and the geometric structures of the preforms and the parameters of the regions are different, and 5 preforms are drawn by the same drawing process to form the panda polarization maintaining optical fiber. The results show that the parameter performance of the polarization crosstalk of 1km length at 1550nm wavelength of 5 optical fibers reaches below-30 dB, the drawing length of a single rod with different diameters of the prefabricated rod is changed along with the parameter performance, and the effective output efficiency of the drawing length is higher for the prefabricated rod with large diameter and can reach more than 120 km. The preform rod of the invention realizes the optimization design of the out-of-roundness of the cladding of the optical fiber under the condition of not adopting surface geometric shape shaping, and the out-of-roundness of the cladding of the optical fiber reaches below 1.1 percent; meanwhile, the screening strength of the drawn optical fiber is ensured to be more than 100 Kpsi.
In addition: it should be noted that the above-mentioned embodiment is only a preferred embodiment of the present patent, and any modification or improvement made by those skilled in the art based on the above-mentioned conception is within the protection scope of the present patent.
Claims (9)
1. A polarization maintaining optical fiber preform comprising: the device comprises a punching and wire drawing fiber forming section (101), an extension tail pipe section (104), a wire drawing clamping section (105) of tail pipe extension flaring, and a deformation section (106) of wire drawing pre-tapering diameter changing;
wherein the hole-drilling fiber-drawing segment (101) comprises a fiber core (102) and a cladding part (109), the cladding part (109) is coated on the periphery of the fiber core (102), and a symmetrical double hole (103) is also arranged in the cladding part (109), and the symmetrical double hole (103) is symmetrically arranged relative to the fiber core (102);
extend tail pipe section (104) and locate wire drawing fiber forming section (101) rear portion of punching, extend tail pipe section (104) and wire drawing fiber forming section (101) parallel that punches, wire drawing centre gripping section (105) are the tail end part of extending tail pipe section (104), wire drawing centre gripping section (105) are the loudspeaker form, and its outside bore is greater than inboard bore, the wire drawing is one part of head end of wire drawing fiber forming section (101) of punching in advance to become the deformation section (106) of awl reducing, and deformation section (106) are the loudspeaker form, and its outside bore is less than inboard bore, and the topmost cone head of deformation section (106) adopts the opening design, and its surface is diplopore open face (108), and it still is equipped with dull polish heat dissipation section (107) near tail end department to extend tail pipe section (104) in addition.
2. A polarization maintaining optical fiber preform according to claim 1, wherein: the diameter D6E of the top end of the conical deformation area of the deformation section (106) is (1mm, 12mm), the transition length L6E of the conical deformation area of the deformation section (106) is (40mm, 80mm), the top end conical head of the deformation section (106) adopts an opening design, and the diameter D8E of the symmetrical double-hole opening surface (108) is required to be (1mm, 5mm).
3. A polarization maintaining optical fiber preform as claimed in claim 1, wherein: the tail end diameter D5 epsilon (32mm, 65mm) of the flaring of the wire drawing clamping section (105).
4. A polarization maintaining optical fiber preform as claimed in claim 1, wherein: the length L7 of the frosted heat dissipation section (107) belongs to the field of 10mm and 200mm, and the distance L57 belongs to the field of 200mm and 500mm between the center point of the frosted heat dissipation section (107) and the tail end of the flaring of the tail pipe extension flaring wire-drawing clamping section (105).
5. A polarization maintaining optical fiber preform as claimed in claim 1, wherein: the pipe inner diameter D4E (22mm, 58mm) of the extension tail pipe section (104) is consistent with the pipe outer diameter D1 of the preform wire-drawing and hole-punching fiber-forming section (101), the length L4E (300mm, 800mm) of the extension tail pipe section (104) is consistent with the size D1 of the long rod outer diameter D1 of the preform wire-drawing and hole-punching fiber-forming section (101), and D1E (30mm, 60mm).
6. A polarization maintaining optical fiber preform as claimed in claim 1, wherein: the diameter D2E of the fiber core (102) belongs to (1mm, 5mm), the length L1E belongs to (200mm, 600mm), the diameter D3E of the symmetrical double holes (103) belongs to (10mm, 20mm), the distance T2E inside the double holes of the symmetrical double holes (103) belongs to (1.5mm, 10mm), and the distance T3E of the outer circle of the fiber drawing segment (101) and the outer circle of the holes of the symmetrical double holes (103) belongs to (2mm, 5mm).
7. A polarization maintaining optical fiber preform according to claim 1, wherein: the extension tail pipe section (104) is in butt joint with the perforated wire-drawing fiber-forming section (101) by using flame or electric furnace or plasma heating, and is fused together to form an integrated forming prefabricated rod structure.
8. A polarization maintaining optical fiber preform according to claim 1, wherein: the wire drawing clamping section (105) heats the tail end through a heat source, and then adopts a mechanical flaring mode to realize the functions of flaring the tail end and clamping the preform rod for wire drawing.
9. A polarization maintaining optical fiber preform as claimed in claim 1, wherein: the deformation section (106) is heated at the head end through a heat source, and a melting extension method is adopted to perform deformation structure of the pre-tapering diameter-changing section, so that the double-hole wire drawing diameter-changing design is realized.
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| CN107915399A (en) * | 2017-12-07 | 2018-04-17 | 通鼎互联信息股份有限公司 | A kind of casing prefabricated stick drawn wire device and its manufacture method and application |
| CN111233315A (en) * | 2018-11-28 | 2020-06-05 | 中天科技精密材料有限公司 | Preform extending device and extending method thereof |
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