CN102503116B - Method for manufacturing rotary optical fiber and rotary fiber winding device - Google Patents
Method for manufacturing rotary optical fiber and rotary fiber winding device Download PDFInfo
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- CN102503116B CN102503116B CN201110310614.6A CN201110310614A CN102503116B CN 102503116 B CN102503116 B CN 102503116B CN 201110310614 A CN201110310614 A CN 201110310614A CN 102503116 B CN102503116 B CN 102503116B
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Abstract
The invention discloses a method for manufacturing a rotary optical fiber. The method comprises a step of manufacturing an optical fiber preform and a step of drawing the optical fiber preform, wherein in the step of drawing the optical fiber preform, a lower end of the rotary optical fiber is rotated along an axial direction of the optical fiber under fiber drawing, and rotation formed in the optical fiber is fixed in the cooling process. The rotary fiber winding device for manufacturing the rotary optical fiber comprises a fiber winding disc arranged in a fiber drawing tower and under the drawn optical fiber, wherein the fiber winding disc has a shape of a spool and is used for rotating with a drawn optical fiber as a rotating axis so as to drive the lower end of the optical fiber to rotate and for rotating with a central shaft of the fiber winding disc as a rotating axis so as to wind the optical fiber. By an ultralow double refraction optical fiber product manufactured by the process and equipment, because the rotation is not generated or cured in a drawing furnace, influence of the rotation in a high-temperature melting state on optical and mechanical properties is avoided, the manufactured ultralow double refraction optical fiber has long-term reliability and stability, and the using requirement of a sensing optical fiber in a harsh environment is met.
Description
Technical field
The present invention relates to low birefringent fiber, refer to that particularly a kind of manufacture method of spin fiber and the rotation for the method receive fine device.
Background technology
Since optical fiber is invented, in many technical fields, obtain and use, especially at fiber optic communication field, various fiber products, comprise that multimode optical fibers, single-mode fiber, dispersion compensating fiber etc. are used in a large number.At sensory field, optical fiber also shows the effect of its uniqueness.Sensor fibre technology comprises many aspects, utilize the susceptibility of optical fiber for different physical quantities, there is the Fibre Optical Sensor product of measuring for different physical quantities to be developed, the Fibre Optical Sensors such as such as temperature, humidity, pH value, specific refractory power, stress and circular frequency.
As everyone knows, single-mode fiber can only conduct pattern, i.e. a LP
01pattern.But from the angle analysis of polarization state, LP
01pattern in fact comprises two polarization modes, i.e. LP
01 xand LP
01 ypattern, therefore in fact single-mode fiber transmits two polarization modes, is not real single mode transport.In general telecommunication optical fiber, due to the existence of various asymmetric factors, as the asymmetry of the bending of the non-circular symmetry of fibre core and covering, optical fiber, external stress, the even variation etc. of temperature, all can make the specific refractory power difference of two polarization modes of single-mode fiber, thereby cause LP
01 xand LP
01 ythe transfer rate difference of pattern in optical fiber, produces so-called polarization mode dispersion (PMD:Polarization Mode Dispersion).The refractive index difference of this different polarization pattern in optical fiber, is called as the birefringent phenomenon of optical fiber, LP
01 xand LP
01 ythe refringence of pattern, is called as the double refraction of optical fiber.
According to the double refraction size of optical fiber, optical fiber is divided into high birefringence optical fiber and low birefringent fiber.In general, double refraction is greater than 10
-6optical fiber be considered to high birefringence optical fiber, and double refraction is lower than 10
-6optical fiber be considered to low birefringent fiber.Polarization maintaining optical fibre is the high birefringence optical fiber of a quasi-representative, and its double refraction is generally greater than 10
-5; And single mode telecommunication optical fiber belongs to low birefringent fiber product, its double refraction is generally 10
-8to 10
-6between.In some Application Areas, in coherent communication and sensory field of optic fibre, need ultralow birefringent fiber optic materials, require the double refraction of optical fiber to be less than 10
-9, even reach 10
-10.It is unapproachable that this ultralow double refraction requires for conventional fiber manufacturing process, must take special drawing optical fibers technique or special optical fiber structure design.Current, the method for manufacturing ultra-low birefringence fiber is generally the double refraction that spin fiber prefabricated rods reduces optical fiber in drawing optical fibers; Aspect optical fiber structure, ultra-low birefringence fiber is generally two kinds of structures, i.e. common single-mode fiber structure and keep optical fiber structure in the so-called circular polarization that fibre cladding part includes stress element.For this reason, some optical fiber and manufacturing process thereof are suggested.Granted publication number is that the Chinese patent < < of CN 1036488 keeps the optical fiber of circular polarization state and its preparation method > >, the Chinese patent < < that Granted publication number is CN 1041129 keeps Chinese patent < < practical circular polarization state-maintaining fiber that the optical fiber of circular polarization state and its preparation method > > and Granted publication number are CN 1242280 and manufacture method > > thereof to propose multiple circular polarization and keeps optical fiber structure and its manufacturing process, principal feature comprises: centrifugal stress element in addition in optical fiber, the quantity of stress element can be one, two or more, and by rotate prefabricated rods in the drawing process of optical fiber, centrifugal stress element is rotated around fibre core, guide line polarization mode is transformed into circular polarisation mode and obtains circular polarization maintenance fiber products.
Publication number is the method that during the Chinese patent application < < of CN 1663922 draws, the optical fiber production equipment of the pre-type of spin fiber and method > > have proposed to rotate preform in the process of wire drawing, reduces the double refraction size of optical fiber.By rotating prefabricated rods technique, can make the double refraction of prepared optical fiber be reduced to 10
-8~ 10
-7.
The problem that the circular polarization that above-mentioned patent proposes keeps optical fiber and manufacturing process thereof to exist some to overcome: owing to having used the not stress element of determined number among optical fiber, make manufacturing processed, drawing process and the follow-up fused fiber splice treating processes of preform all more difficult, the manufacture difficulty of especially special-shaped prefabricated rods, easily bursts and scraps.In addition, by rotating preform, reduce the method for fiber birefringence, in actual optical fiber production process, be also difficult to realize.As publication number, be that the patent application document of CN 1663922 is pointed, because being heated to more than 1800 ℃, the part of the prefabricated rods in drawing process in fiber drawing furnace be molten state, the centrifugal force that any spinning movement of prefabricated rods produces all can make its disalignment position and have influence on the quality of optical fiber, facts have proved that the prefabricated rods speed of rotation under wire drawing state must be controlled in below 100r/min, otherwise the high-temperature fusion part of prefabricated rods may be thrown off medullary ray and cause fiber drawing furnace to be scrapped, consider that the swivel distance (swivel is apart from the length that is defined as fiber-optic periodic rotation) of birefringence fiber is in 3mm left and right, therefore by rotating the method for prefabricated rods, drawing speed of optical fiber is only in 0.3m/min left and right, optical fiber that so lower velocity draws is the demand that cannot meet actual use in mechanical property.
Summary of the invention
Technical problem to be solved by this invention is just to provide a kind of manufacture method of spin fiber and receives fine device for the rotation of the method, can according to requirements produce low-birefringence and ultra-low birefringence fiber.
For solving the problems of the technologies described above, the manufacture method of a kind of spin fiber provided by the invention comprises the drawing step of making step and the preform of preform, its special feature is: in the drawing step of described preform, lower end along fiber axis to spin fiber in wire drawing is fixed the rotation forming in optical fiber in process of cooling.
In technique scheme, in the making step of described preform, adopt a kind of deposition method in MCVD, PCVD, OVD and VAD.
In technique scheme, the diameter of described preform is 5 ~ 15mm.
In technique scheme, the speed of rotation of the lower end of described optical fiber is single speed or speed change degree, and the speed of rotation of the lower end of optical fiber is 500 ~ 1000r/min.
In technique scheme, the sense of rotation of the lower end of described optical fiber is clockwise or counter clockwise direction.
In technique scheme, the drawing speed of described preform is at the uniform velocity or speed change degree, and the drawing speed of preform is 1 ~ 50m/min.
Fine device is received in the rotation of a kind of manufacture for spin fiber provided by the invention, comprise the fine dish of the receipts that are arranged under the optical fiber being drawn in wire-drawer-tower, the fine dish of described receipts is I-shaped colyliform, rotates to drive the lower end of optical fiber rotate and rotate to realize take Shou Xian disk center axle as rotating shaft receipts fibre for the optical fiber to be drawn as rotating shaft.
In technique scheme, described two ends of receiving fine dish are arranged on pillar by support, and the lower end of pillar is provided with bearing, for rotation is received to fine device, are arranged on wire-drawer-tower; Described support with pillar for being flexibly connected, so that support can rotate take pillar central shaft as rotating shaft.
In technique scheme, the described diameter of receiving fine dish is 30 ~ 75mm, and width is 10 ~ 50mm.
Beneficial effect of the present invention is:
1) adopting the ultra-low birefringence fiber of Processes and apparatus manufacturing of the present invention is the lower end along fiber axis to spin fiber in wire drawing, to drive the optical fiber under the molten state of top to produce rotation, and in process of cooling, the rotation forming in optical fiber is fixed to made fiber products, due to the generation of rotating and curing not in fiber drawing furnace, so avoided optics on optical fiber of rotation under high temperature fused state and the impact of mechanical property, the ultra-low birefringence fiber of manufacturing has long-term reliability and stability, meet the requirement that sensor fibre is used under severe environment,
2) ultra-low birefringence fiber of manufacturing has the prefabricated rods depositing operation identical with other fiber products and essentially identical drawing process and other identical constructional features except rotation, as: cross-sectional shape, optical fiber material, index distribution etc., the processing of being convenient to manufacturing optical fiber is used, and easily and other fiber products compatibility, be convenient to the integrated application of ultra-low birefringence fiber;
3) swivel of manufacturing optical fiber is apart from reaching 1mm, the swivel distance that is less than spin fiber 3 ~ 10mm left and right that in prior art, spin fiber prefabricated rods technique obtains, therefore the double refraction of the ultra-low birefringence fiber of manufacturing of the present invention can be according to requirements 10
-10to 10
-6between regulate, can be used to optical fibre device and the fibre system of all optical fibre structure completely, the optical fibre device and the fibre system that are compared to conventional composite (generally including optical fiber, crystalline material, Coating Materials etc.), have better properties stability and work reliability;
4) manufacture method of ultra-low birefringence fiber provided by the invention, be compatible with traditional fiber manufacturing process flow completely, have the advantages that continuous and automatic is manufactured, can meet the production of big-length ultra-low birefringence fiber, and can realize the large-scale production demand of this optical fiber;
5) use the big-length ultra-low birefringence fiber of the inventive method and the manufacture of circumgyration stretch tower can meet the user demands to several kilometers of ultra-low birefringence fibers for continuous hundreds of rice such as fiber optic gyro, for development high stability, high-precision optical fiber gyro, have great importance.
Accompanying drawing explanation
Fig. 1 is the structural representation of single-mode fiber.
Fig. 2 is spin fiber structural representation, and its swivel distance is L.
Fig. 3 is the structural representation that an embodiment of fine device is received in rotation.
Fig. 4 is drawing process schematic diagram in the manufacture method of spin fiber of the present invention.
In figure: 1-covering, 2-fibre core, 3-single-mode fiber, 4-spin fiber, 5-rotation, 6-rotation is received fine device (wherein: the fine dish of 6.1-receipts, 6.2-support, 6.3-pillar, 6.4-bearing), 7-wire-drawer-tower, 8-preform, 9-chuck, 10-fiber drawing furnace, 11-optical fiber shaping mechanism.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail.
As shown in Figure 1, general single-mode fiber 3 at least comprises covering 1 and fibre core 2, and covering 1 and fibre core 2 are here round rotational symmetry structure, and covering 1 and fibre core 2 concentric.This single-mode fiber comprises LP
01 xand LP
01 ytwo polarization modes, when optical fiber 3 is owing to existing the asymmetric situations such as structure and stress, LP
01 xand LP
01 ythe specific refractory power of pattern is unequal, its refringence | n
lP01x-n
lP01y| be the double refraction of single-mode fiber 3.
As shown in Figure 2, utilize the spin fiber 4 of manufacture method manufacturing of the present invention still at least comprising the structure of covering 1 and fibre core 2, comprise in addition the coat that covers covering 1 surface, coat is macromolecule resin or elastomeric material.Different from general single mode fiber 3, in this spin fiber 4, be solidified with rotation 5, its swivel apart from L generally at 1 ~ 50mm.Swivel refers to solidify the spacing between two adjacent rotations 5 of spin fiber 4 apart from L.
Fig. 3 has illustrated that the rotation of a kind of manufacture for spin fiber of the present invention receives fine device 6, it comprises the fine dish 6.1 of receipts that is I-shaped colyliform, in order to make whole rotation receive fine device 6, can under the situation of high speed rotating, keep stable and receive finely, require its small volume, quality suitable.Generally speaking, the diameter of the fine dish 6.1 of receipts using is 30 ~ 75mm, and width is 10 ~ 50mm, and uses metallic substance, and good rigidity is indeformable.The two ends of receiving fine dish 6.1 are arranged on pillar 6.3 by support 6.2, the lower end of pillar 6.3 is provided with bearing 6.4, for rotation is received to fine device 6, be arranged on wire-drawer-tower 7, and make the mounted while of bearing 6.4, guarantee to receive fine coil 6.1 be arranged in optical fiber that wire-drawer-tower 7 drawn under.The fine dish 6.1 of above-mentioned receipts can rotate to realize take its central shaft as rotating shaft receive fine, and support 6.2 with pillar 6.3 upper ends for being flexibly connected so that carrying receipts fibre, coil 6.1 support 6.2 and can rotate take pillar 6.3 central shafts as rotating shaft.
Fig. 4 has illustrated that containing Fig. 3 rotates the schematic diagram of receiving the wire-drawer-tower 7 of fine device 6 and be rotated the drawing of optical fiber.This equipment for be the preform 8 of manufacturing with conventional deposition methods such as MCVD, PCVD, OVD and VAD, for obtain lower drawing speed in drawing process, and therefore obtain shorter swivel apart from L, preferably use the preform that diameter is less, as 5 ~ 15mm.Next, preform 8 is placed in to wire-drawer-tower 7, preform 8 upper ends by chuck 9 grip, lower end is placed in fiber drawing furnace 10, its tail end forms conical by hot mastication and under action of gravity, the optical fiber that meets designed size in vertex of a cone position is drawn.When the optical fiber being drawn leaves after process furnace 10 near the rapid cool to room temperature of quilt, then by measurement, annealing, cooling, a series of optical fiber shaping mechanisms 11 such as apply, solidify, be finally rotated and receive fine device 6 and place in receiving on fine dish 6.1.Rotation had both placed optical fiber take its central shaft as rotating shaft to receive fine dish 6.1, also give optical fiber certain drawing tensile force, so that from melting prefabricated rods tapering continuous drawing optical fiber, simultaneously, support 6.2 is together with receiving fine dish 6.1 also around the central shaft of the optical fiber being drawn along clockwise or counterclockwise horizontally rotate, and by this rotation the fiber optic conduction by cooling curing to the vertex of a cone of melting prefabricated rods, and make the vertex of a cone of melting prefabricated rods produce rotation, receiving fine dish 6.1 is 500 ~ 1000r/min around the rotating speed of the optical fiber horizontal rotation being drawn, and can be single speed or speed change degree.The rotation of this vertex of a cone can be brought in the optical fiber of continuous drawing, and is cured in the process of cooling after optical fiber leaves process furnace, produces the ultralow birefringent fiber products that swivel is 1 ~ 50mm apart from L.In addition, require, around the drawing speed of receiving fine dish 6.1 central shafts and rotate the receipts fibre linear velocity causing and equal optical fiber, to be generally 1 ~ 50m/min, and can be at the uniform velocity or speed change degree.By adjustment, receive fine dish 6.1 above-mentioned orthogonal two kinds of speed of rotation, can adjust the swivel of optical fiber apart from L and drawing speed, obtain the ultra-low birefringence fiber product that meets practical application request.
The motion control that fine device 6 is received in rotation is integrated in the Comprehensive Control platform of fiber drawing tower 7, receive fine dish 6.1 horizontally rotate speed, around the speed of rotation of its central shaft etc., all by computer controlled automatic, with the each parameter of matching and optimization to produce the low-refraction fiber products that reaches design requirements.
Select the G.652D single-mode fiber prefabricated rods of type, preform 8 is placed in to fiber drawing tower 7, and use rotation provided by the present invention to receive fine device 6 to draw the ultralow birefringent single mode with revolving property.Table 1 has provided the single-mode fiber that manufacturing obtains when different wire drawing rotation parameters and the double refraction size of testing each optical fiber of gained.
Table one
| Embodiment | Optical fiber prefabricating rod outside diameter (mm) | The drawing speed (m/min/) of preform | Receive fine dish and horizontally rotate speed (r/min) | After drawing, (μ m) for fibre cladding diameter | Fiber spinning pitch L(mm after drawing) | The fiber birefringence that test obtains |
| 1 | 15 | 50 | 1000 | 125 | 50 | ～9.3×10 -7 |
| 2 | 15 | 10 | 800 | 125 | 12.5 | ～5.1×10 -8 |
| 3 | 15 | 1 | 1000 | 125 | 1 | ～6.2×10 -9 |
| 4 | 10 | 50 | 1000 | 125 | 50 | ～8.6×10 -7 |
| 5 | 10 | 10 | 800 | 125 | 12.5 | ～4.7×10 -8 |
| 6 | 10 | 1 | 1000 | 125 | 1 | ～5.0×10 -9 |
| 7 | 5 | 50 | 1000 | 125 | 50 | ～7.9×10 -7 |
| 8 | 5 | 10 | 800 | 125 | 12.5 | ～3.8×10 -8 |
| 9 | 5 | 1 | 1000 | 125 | 1 | ～4.3×10 -9 |
By the test result in table one, can be found, the double refraction of spin fiber 4 can be far smaller than the double refraction size of non-rotating single-mode fiber, and along with the reducing of fiber spinning pitch L, the double refraction of optical fiber is also along with reduction.Select suitable processing parameter, can produce double refraction 10
-10to 10
-6fiber products.Result shows, uses the manufacture method of spin fiber proposed by the invention and rotation to receive fine device, can be according to actual needs, produce the low-birefringence and the ultra-low birefringence fiber that meet Fibre Optical Sensor and fiber optic communication field actual needs.
Core of the present invention is by the lower end along fiber axis to spin fiber in wire drawing; to drive the optical fiber under the molten state of top to produce rotation 5; and in process of cooling, the rotation forming in optical fiber 5 is fixed to make low-birefringence and ultra-low birefringence fiber, so its protection domain is not limited to above-described embodiment.Obviously, those skilled in the art can carry out various changes and distortion and not depart from the scope of the present invention and spirit the present invention, for example: the making step of preform 8 can adopt any conventional deposition method; The preform 8 of making is also not limited to the listed limited several numerical value of embodiment, within the scope of 5 ~ 15mm, is all fine; Receive fine dish 6.1 horizontally rotate speed, around processing parameters such as the speed of rotation of its central shaft, also can regulate according to the optical fiber of required double refraction size etc.If these changes and distortion belong in the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and is out of shape interior.
Claims (5)
1. the manufacture method of a spin fiber, comprise the drawing step of making step and the preform of preform, it is characterized in that: in the drawing step of described preform, lower end along fiber axis to spin fiber in wire drawing is fixed the rotation forming in optical fiber in process of cooling; The diameter of described preform is 5 ~ 15mm; The speed of rotation of the lower end of described optical fiber is single speed or speed change degree, and the speed of rotation of the lower end of optical fiber is 500 ~ 1000r/min; The drawing speed of described preform is at the uniform velocity or speed change degree, and the drawing speed of preform is 1 ~ 50m/min.
2. the manufacture method of a kind of spin fiber according to claim 1, is characterized in that: in the making step of described preform, adopt a kind of deposition method in MCVD, PCVD, OVD and VAD.
3. the manufacture method of a kind of spin fiber according to claim 1 and 2, is characterized in that: the sense of rotation of the lower end of described optical fiber is clockwise or counter clockwise direction.
4. fine device is received in the rotation for the manufacture of spin fiber, it is characterized in that: it comprises the fine dishes of receipts (6.1) that are arranged under the optical fiber being drawn in wire-drawer-tower (7), the fine dishes of described receipts (6.1) are I-shaped colyliform, for the optical fiber to be drawn as rotating shaft rotate to drive the lower end rotation of optical fiber and take receive fine dish (6.1) central shaft as rotating shaft rotate to realize receive fine; It is upper that described two ends of receiving fine dish (6.1) are arranged at pillar (6.3) by support (6.2), and the lower end of pillar (6.3) is provided with bearing (6.4), for rotating the fine devices of receipts (6), is arranged on wire-drawer-tower (7); Described support (6.2) with pillar (6.3) for being flexibly connected, so that support (6.2) can rotate take pillar (6.3) central shaft as rotating shaft.
5. fine device is received in the rotation of the manufacture for spin fiber according to claim 4, it is characterized in that: the described diameter of receiving fine dish (6.1) is 30 ~ 75mm, and width is 10 ~ 50mm.
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|---|---|---|---|
| CN201110310614.6A CN102503116B (en) | 2011-10-14 | 2011-10-14 | Method for manufacturing rotary optical fiber and rotary fiber winding device |
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|---|---|---|---|
| CN201110310614.6A CN102503116B (en) | 2011-10-14 | 2011-10-14 | Method for manufacturing rotary optical fiber and rotary fiber winding device |
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| CN102503116B true CN102503116B (en) | 2014-04-23 |
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| CN105198202B (en) * | 2014-06-12 | 2017-11-21 | 上海亨通光电科技有限公司 | A kind of method for manufacturing spin fiber |
| CN106597601A (en) * | 2015-10-20 | 2017-04-26 | 武汉长盈通光电技术有限公司 | Microstructural low birefringence optical fiber and manufacturing method thereof |
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| CN1209793A (en) * | 1996-01-22 | 1999-03-03 | 康宁股份有限公司 | Optical-fiber of modulated spin for reducing polarisation mode dispersion and process and apparatus for its manufacture |
| CN1599871A (en) * | 2002-08-31 | 2005-03-23 | Lg电线有限公司 | Apparatus for applying spin to optical fiber and optical fiber manufacturing method and apparatus |
| JP2009109915A (en) * | 2007-10-31 | 2009-05-21 | Sumitomo Electric Ind Ltd | Method of winding up optical fiber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109437548A (en) * | 2019-01-02 | 2019-03-08 | 上海康阔光智能技术有限公司 | Spiral high birefringence structure protects elliptical polarization optical fiber manufacturing process |
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| CN102503116A (en) | 2012-06-20 |
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