CN101833129A - Smelting embedded hollow multi-core polarization-preserving fiber and preparation method thereof - Google Patents
Smelting embedded hollow multi-core polarization-preserving fiber and preparation method thereof Download PDFInfo
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- CN101833129A CN101833129A CN 201010159137 CN201010159137A CN101833129A CN 101833129 A CN101833129 A CN 101833129A CN 201010159137 CN201010159137 CN 201010159137 CN 201010159137 A CN201010159137 A CN 201010159137A CN 101833129 A CN101833129 A CN 101833129A
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Abstract
The invention provides a smelting embedded hollow multi-core polarization-preserving fiber and a preparation method thereof. The preparation method comprises the following steps of: preparing a fiber with a certain core/cladding ratio by adopting the known MCVD process, wherein the refractive index of the core of the fiber is greater than that of the cladding, and the refractive index of the cladding is the same as that of an outer quartz tube; sintering the fiber onto the inner wall of the quartz tube by using oxyhydrogen flames along the axial direction of the quartz tube so as to form a precast bar; and performing wire drawing at normal wiredrawing temperature by using a fiber drawing tower to make the fiber elliptic or similar elliptic and attached to the inner wall of a capillary tube. The smelting embedded hollow multi-core polarization-preserving fiber is characterized in that: the cross-section structure comprises the cladding, the elliptical core and a capillary pore respectively from the outside to the inside; the elliptic core is smelted and embedded onto the inner wall of the quartz capillary tube; and one side close to the inner wall of the capillary tube forms a thick quartz cladding, and the other side is exposed in the air in the capillary pore to form a thin quartz cladding, wherein the refractive index of the elliptic core is greater than that of the quartz cladding. The fiber prepared by the method has the advantages of high strength, simple preparation process and low cost.
Description
Technical field
The invention belongs to the optical fiber technology field, relate to a kind of multi-core polarization-preserving fiber, relate in particular to a kind of melting embedded hollow multi-core polarization-preserving fiber and preparation method thereof.
Background technology
Polarization maintaining optical fibre claims polarization-maintaining fiber again, is a kind of of special optical fiber.It has a wide range of applications in the communication system and the Fibre Optical Sensor field of wavelength-division multiplex.Especially in the Fibre Optical Sensor field, it is the core sensing component of military sensors such as optical fibre gyro, fibre optic hydrophone, optical integrated device.Because optical fibre gyro and fibre optic hydrophone etc. can be used for military inertial navigation and sonar, belong to high-new technology products, and polarization maintaining optical fibre are its core components, thereby polarization maintaining optical fibre is listed in the inventory that I am embargoed by western developed country always.
In common communications optical fiber, because its circular symmetry structure, the linear polarization light of incident is through after the transmission of certain distance, because coupling, the energy exchange of different polarization pattern, can become ellipse or circularly polarized light and can't the retention wire polarization state.And when a linearly polarized light is coupled into polarization maintaining optical fibre, if the polarization principal axis of the polarization direction of linearly polarized light and polarization maintaining optical fibre overlaps, then linearly polarized light can be in transmission course the retention wire polarization direction until leaving polarization maintaining optical fibre.The polarization maintaining optical fibre product comprises how much birefringences and stress birefrin polarization maintaining optical fibre.How much birefringent examples are oval core polarization maintaining optical fibres, and the fibre core of this optical fiber is disciform, utilize the asymmetry of this geometry to produce birefringence effect.The polarization maintaining optical fibre of stress birefrin mainly contains panda type, knot type, oval jacket type.The characteristics of this type optical fiber are to introduce the stressed zone extruding fibre core with high expansion coefficient to produce birefringence effect in the covering of optical fiber.
Present common silica fibre generally all passes through preparation prefabricated rods earlier, again prefabricated rods is carried out wire drawing and makes.Polarization maintaining optical fibre is no exception.Process the method for oval core polarization maintaining optical fibre, generally include these steps: axial along prefabricated rods, the grinding of prefabricated rods both sides is smooth, perhaps at prefabricated rods two side hole, fluting, adopt the prefabricated rods parcel after tiretube process will be repaired then, carry out drawing optical fibers again.
Summary of the invention
The object of the present invention is to provide a kind of intensity height, the melting embedded widely hollow multi-core polarization-preserving fiber of application.The present invention also aims to provide the preparation method of the melting embedded hollow multi-core polarization-preserving fiber that a kind of technology is simple, cost is low
The object of the present invention is achieved like this:
The cross-sectional structure of melting embedded hollow multi-core polarization-preserving fiber of the present invention is respectively covering 1, oval core 2 and pore 3 from outside to inside; Oval core is molten to be embedded on the inwall of quartz capillary, constitutes thick quartzy covering 1-1 near capillary tube inner wall one side, and opposite side is exposed in the air of pore, constitutes thin quartzy covering 1-2, and wherein the refractive index of oval core is greater than the refractive index of quartzy covering; Fiber optic hub has the pore structure.
Fibre core is ellipse or class elliptical shape.
Molten being embedded on the quartz capillary inwall of an oval core part constitutes thick quartzy covering 1-1 near capillary tube inner wall one side, plays fixing and supporting ellipse core simultaneously.
The opposite side of oval core is exposed in the air of quartz wool pore, constitutes thin quartzy covering 1-2.
Thin quartzy cladding thickness is 3 microns, utilizes the field effect of dying of the formal little slender bamboo of thin quartzy covering, and the various materials of carrying can be used for making various novel optical fiber devices and novel full Fibre Optical Sensor in pore.
Have multicore structure, can be used for making various high sensitivity full optical fiber interferometers.
Oval core refractive index is greater than quartzy covering.
The preparation method of melting embedded hollow multi-core polarization-preserving fiber of the present invention is: adopt known MCVD technology preparation to have the optical fiber 5 of certain core bag ratio, the sandwich layer refractive index of optical fiber is greater than covering, and covering is identical with the refractive index of outer quartz ampoule 4, utilizes oxyhydrogen flame that optical fiber axially is sintered in inside pipe wall to form prefabricated rods along quartz ampoule then; Utilize fiber drawing tower then, carry out wire drawing under the condition of normal wire-drawing temperature, prefabricated rods is subjected to capillary effect under high-temperature condition, impels optical fiber to become ellipse or the class elliptical shape is attached on the capillary tube inner wall, reaches the effect of molten embedding.
Utilize oxyhydrogen flame that optical fiber axially is sintered in inside pipe wall along quartz ampoule to be: keep the quartz ampoule level with the method that forms prefabricated rods, from a collection of optical fiber for preparing, select one, be positioned on the inwall of quartz ampoule, wherein optical fiber one end slightly extends outward a part, and the central shaft of optical fiber is to parallel to the maintenance nature with the central shaft of quartz ampoule at this moment; Utilize oxyhydrogen flame that outward extending fiber section is heated again, the optical fiber of fusion is subjected to capillary effect and condenses into quartz ball, and adheres to quartz ampoule 4 mouth of pipe places, and can realize that optical fiber hangs on the inwall of quartz ampoule this moment; Utilize the method on the quartz ampoule inwall, to hang other optical fiber one by one.
Melting embedded hollow multi-core polarization-preserving fiber cross-sectional structure of the present invention is respectively quartzy covering 1, oval core 2 and pore 3 from outside to inside.Oval core is molten to be embedded on the inwall of quartz capillary, constitutes thick quartzy covering near capillary tube inner wall one side, and opposite side is exposed in the air in the pore, constitutes thin quartzy covering, and wherein the refractive index of oval core is greater than the refractive index of quartzy covering; Fiber optic hub has the pore structure.The major advantage of the melting embedded hollow multi-core polarization-preserving fiber of this special construction is that it not only has the characteristics of common oval core polarization maintaining optical fibre, and has multicore structure, can be used to make various high sensitivity full optical fiber interferometers; In addition, melting embedded hollow multi-core polarization-preserving fiber also has thin quartzy covering and center pore structure, when the center pore carries various material, utilize the field effect of dying of the formal little slender bamboo of thin quartzy covering, can be used to make various novel optical fiber devices and novel full Fibre Optical Sensor.
The preparation method of melting embedded hollow multi-core polarization-preserving fiber, its technical characterictic is: adopt known MCVD technology preparation to have the large core fiber of certain core bag ratio, its center core layer refractive index is greater than covering, and covering is identical with the refractive index of outer quartz ampoule, utilize oxyhydrogen flame that large core fiber axially is sintered in inside pipe wall to form prefabricated rods along quartz ampoule again, utilize fiber drawing tower then, under the condition of normal optical fiber wire-drawing temperature, carry out drawing optical fibers.Because prefabricated rods is subjected to capillary effect under high-temperature condition, impel large core fiber to become ellipse or the class elliptical shape is attached on the capillary tube inner wall, reach the effect of molten embedding.
Melting embedded hollow multi-core polarization-preserving fiber preparation method of the present invention and known oval core polarization maintaining optical fibre preparation method are (referring to JP 6-285838A, CN 1376935A, WO 9748648A, WO 9740408A) relatively, do not need to carry out quartzy cold processing techniques such as the grinding of prefabricated rods side, fluting, perforate, only needs the large core fiber for preparing is sintered on the quartz ampoule inwall and get final product, so the intensity of gained optical fiber significantly improves, and preparation technology simply, low cost and other advantages.
Substantial effect of the present invention is:
1. melting embedded hollow multi-core polarization-preserving fiber not only has the characteristics of common oval core polarization maintaining optical fibre, and has multicore structure, can be used for making various high sensitivity full optical fiber interferometers;
2. melting embedded hollow multi-core polarization-preserving fiber has thin quartzy covering and center pore structure, when the center pore carries various material, utilizes the field effect of dying of the formal little slender bamboo of thin quartzy covering, can be used to make various novel optical fiber devices and novel full Fibre Optical Sensor;
3. melting embedded hollow multi-core polarization-preserving fiber preparation method need not to carry out quartzy cold processing techniques such as the grinding of prefabricated rods side, fluting, perforate, only the large core fiber for preparing need be sintered on the quartz ampoule inwall and get final product, therefore the intensity of gained optical fiber significantly improves, and preparation technology is simple, low cost and other advantages.
Description of drawings
Fig. 1-a is a kind of melting embedded hollow twin-core polarization maintaining optical fibre end view;
Fig. 1-b is a kind of melting embedded hollow twin-core polarization-preserving fiber preform end view;
Fig. 2-a is a kind of melting embedded hollow three core polarization maintaining optical fibre end view;
Fig. 2-b is a kind of melting embedded hollow three core polarization-preserving fiber preform end view;
Fig. 3-a is a kind of melting embedded hollow four-core polarization maintaining optical fibre end view;
Fig. 3-b is a kind of melting embedded hollow four-core polarization-preserving fiber preform end view;
Fig. 4 is a kind of melting embedded hollow multi-core polarization-preserving fiber prefabricated rods sintering synoptic diagram;
Fig. 5-a and Fig. 5 b are melting embedded hollow twin-core, three core polarization maintaining optical fibres end view drawings in kind.
Embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
Shown in Fig. 1-a, a kind of melting embedded hollow twin-core polarization maintaining optical fibre.It is respectively quartzy covering 1, oval core 2 and pore 3 from outside to inside.Its architectural feature is: two molten being embedded on the inwall of quartz capillary of oval core symmetry, and wherein two long axis of ellipse are identical separately respectively with short-axis direction; Constitute thick quartzy covering 1-1 near capillary tube inner wall one side, opposite side is exposed in the air of pore, constitutes thin quartzy covering 1-2; The refractive index of oval core 2 is greater than the refractive index of quartzy covering 1; Fiber optic hub has the pore structure.
A kind of preparation method of melting embedded hollow twin-core polarization maintaining optical fibre comprises following concrete steps:
(1) adopt known MCVD technology preparation to have the large core fiber prefabricated rods of 1: 2 core bag ratio, its center core layer refractive index is greater than covering, and adopting known drawing optical fibers technology that the large core fiber prefabricated rods is drawn into external diameter then is 600um large core fiber 5;
(2) prepare an external diameter 10mm/ internal diameter 8mm quartz ampoule 4, its its refractive index is identical with large core fiber 4 cladding indexs, utilize oxyhydrogen flame 6 successively large core fiber 5 to be sintered in inside pipe wall to form prefabricated rods along quartz ampoule 4 axial symmetries then, as Fig. 1-b, its concrete sintering method is as shown in Figure 4: keep quartz ampoule 4 levels, large core fiber 5 is positioned on the inwall of quartz ampoule, wherein optical fiber one end slightly extends outward a part, and the central shaft of optical fiber is to parallel to the maintenance nature with the central shaft of quartz ampoule at this moment; Utilize 6 pairs of outward extending fiber sections of oxyhydrogen flame to heat again, the large core fiber 5 of fusion is subjected to capillary effect can condense into quartz ball, and adheres to quartz ampoule mouth of pipe place, and can realize that optical fiber hangs on the inwall of quartz ampoule 4 this moment;
(3) utilize fiber drawing tower, under the condition of normal optical fiber wire-drawing temperature, carry out drawing optical fibers.Because prefabricated rods is subjected to capillary effect under high-temperature condition, impel large core fiber to become ellipse or the class elliptical shape is attached on the capillary tube inner wall, reach the effect of molten embedding.
By above preparation method, we make melting embedded hollow twin-core, three core polarization maintaining optical fibres in the laboratory, and its end face in kind as shown in Figure 5.
Shown in Fig. 2-a, a kind of melting embedded hollow three core polarization maintaining optical fibres.Example 2 with the main difference of example 1 is: in melting embedded hollow three core polarization maintaining optical fibre inside, three fiber cores become equilateral triangle to arrange, and major axis (minor axis) direction of the major axis of each ellipse core (minor axis) direction and an adjacent ellipse core is 60 and spends angles.
The preparation method of present embodiment is identical with embodiment 1.
Shown in Fig. 3-a, a kind of melting embedded hollow four-core polarization maintaining optical fibre.Example 2 with the main difference of example 1 is: in melting embedded hollow four-core polarization maintaining optical fibre inside, four fiber cores become square to arrange, and the major axis of a pair of ellipse core (minor axis) direction is vertical mutually with another major axis to two ellipse cores (minor axis) direction.
The preparation method of present embodiment is identical with embodiment 1.
Claims (4)
1. melting embedded hollow multi-core polarization-preserving fiber, it is characterized in that: cross-sectional structure is respectively covering (1), oval core (2) and pore (3) from outside to inside; Oval core is molten to be embedded on the inwall of quartz capillary, constitutes thick quartzy covering (1-1) near capillary tube inner wall one side, and opposite side is exposed in the air of pore, constitutes thin quartzy covering (1-2), and wherein the refractive index of oval core is greater than the refractive index of quartzy covering.
2. melting embedded hollow multi-core polarization-preserving fiber according to claim 1 is characterized in that: thin quartzy cladding thickness is 3 microns.
3. the preparation method of a melting embedded hollow multi-core polarization-preserving fiber, it is characterized in that: adopt known MCVD technology preparation to have the optical fiber (5) of certain core bag ratio, the sandwich layer refractive index of optical fiber is greater than covering, and covering is identical with the refractive index of outer quartz ampoule 4, utilizes oxyhydrogen flame that optical fiber axially is sintered in inside pipe wall to form prefabricated rods along quartz ampoule then; Utilize fiber drawing tower then, carry out wire drawing under the condition of normal wire-drawing temperature, prefabricated rods is subjected to capillary effect under high-temperature condition, impels optical fiber to become ellipse or the class elliptical shape is attached on the capillary tube inner wall, reaches the effect of molten embedding.
4. the preparation method of melting embedded hollow multi-core polarization-preserving fiber according to claim 3, it is characterized in that describedly utilizing oxyhydrogen flame that optical fiber axially is sintered in inside pipe wall along quartz ampoule to be: keep the quartz ampoule level with the method that forms prefabricated rods, from a collection of optical fiber for preparing, select one, be positioned on the inwall of quartz ampoule, wherein optical fiber one end slightly extends outward a part, and the central shaft of optical fiber is to parallel to the maintenance nature with the central shaft of quartz ampoule at this moment; Utilize oxyhydrogen flame that outward extending fiber section is heated again, the optical fiber of fusion is subjected to capillary effect and condenses into quartz ball, and adheres to quartz ampoule 4 mouth of pipe places, and can realize that optical fiber hangs on the inwall of quartz ampoule this moment; Utilize the method on the quartz ampoule inwall, to hang other optical fiber one by one.
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| CN2010101591373A CN101833129B (en) | 2010-04-29 | 2010-04-29 | Smelting embedded hollow multi-core polarization-preserving fiber and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842418A (en) * | 2017-04-18 | 2017-06-13 | 中国电子科技集团公司第四十六研究所 | A kind of hollow polarization keeps photonic crystal fiber |
| CN108191224A (en) * | 2017-12-29 | 2018-06-22 | 武汉长盈通光电技术有限公司 | A kind of multi-core optical fiber preparation method based on glass tube |
| CN113121103A (en) * | 2019-12-31 | 2021-07-16 | 武汉光谷长盈通计量有限公司 | Method for manufacturing hollow internally-suspended high-refractive-index multi-core optical fiber |
| CN113126199A (en) * | 2019-12-31 | 2021-07-16 | 武汉光谷长盈通计量有限公司 | Hollow inner suspension core optical fiber and manufacturing method thereof |
| CN113548797A (en) * | 2021-07-02 | 2021-10-26 | 哈尔滨工程大学 | Preparation method of elliptical core optical fiber |
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| JPH0243510A (en) * | 1988-08-04 | 1990-02-14 | Nikko Kapura:Kk | Production of polarization maintaining coupler |
| WO1997048648A1 (en) * | 1996-06-17 | 1997-12-24 | Corning Incorporated | Method of making polarization retaining fiber |
| CN1224851C (en) * | 2002-11-14 | 2005-10-26 | 江苏法尔胜光子有限公司 | Structure and manufacturing method of elliptical jacket type premade stick and light bias fiber |
| CN201096918Y (en) * | 2007-09-13 | 2008-08-06 | 珠海保税区光联通讯技术有限公司 | Polarization optical branch bundle/merged bundle device |
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2010
- 2010-04-29 CN CN2010101591373A patent/CN101833129B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0243510A (en) * | 1988-08-04 | 1990-02-14 | Nikko Kapura:Kk | Production of polarization maintaining coupler |
| WO1997048648A1 (en) * | 1996-06-17 | 1997-12-24 | Corning Incorporated | Method of making polarization retaining fiber |
| CN1224851C (en) * | 2002-11-14 | 2005-10-26 | 江苏法尔胜光子有限公司 | Structure and manufacturing method of elliptical jacket type premade stick and light bias fiber |
| CN201096918Y (en) * | 2007-09-13 | 2008-08-06 | 珠海保税区光联通讯技术有限公司 | Polarization optical branch bundle/merged bundle device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842418A (en) * | 2017-04-18 | 2017-06-13 | 中国电子科技集团公司第四十六研究所 | A kind of hollow polarization keeps photonic crystal fiber |
| CN106842418B (en) * | 2017-04-18 | 2019-12-03 | 中国电子科技集团公司第四十六研究所 | A kind of hollow polarization holding photonic crystal fiber |
| CN108191224A (en) * | 2017-12-29 | 2018-06-22 | 武汉长盈通光电技术有限公司 | A kind of multi-core optical fiber preparation method based on glass tube |
| CN113121103A (en) * | 2019-12-31 | 2021-07-16 | 武汉光谷长盈通计量有限公司 | Method for manufacturing hollow internally-suspended high-refractive-index multi-core optical fiber |
| CN113126199A (en) * | 2019-12-31 | 2021-07-16 | 武汉光谷长盈通计量有限公司 | Hollow inner suspension core optical fiber and manufacturing method thereof |
| CN113126199B (en) * | 2019-12-31 | 2023-06-27 | 武汉光谷长盈通计量有限公司 | Hollow inner suspension core optical fiber and manufacturing method thereof |
| CN113548797A (en) * | 2021-07-02 | 2021-10-26 | 哈尔滨工程大学 | Preparation method of elliptical core optical fiber |
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