CN210166530U - Linear single polarization optical fiber - Google Patents
Linear single polarization optical fiber Download PDFInfo
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- CN210166530U CN210166530U CN201920844979.9U CN201920844979U CN210166530U CN 210166530 U CN210166530 U CN 210166530U CN 201920844979 U CN201920844979 U CN 201920844979U CN 210166530 U CN210166530 U CN 210166530U
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Abstract
The utility model relates to a "style of calligraphy single polarization optic fibre, optic fibre includes fibre core (1), wraps up inner cladding (2) outside fibre core (1), its characterized in that: the stress-bearing structure is characterized in that stress action areas (3) are symmetrically arranged on two sides of the inner cladding (2) along the axial direction of the inner cladding, the cross section of each stress action area (3) is of a straight-line-shaped structure, the outer cladding (5) wraps the inner cladding (2) and the stress action areas (3), and air holes (4) are formed in the outer cladding (5) along the axial direction of the outer cladding. The utility model relates to a "style of calligraphy single polarization optic fibre, the geometric symmetry that" a "style of calligraphy stress action district that it had improved temperature adaptability, just had improved its uniformity and made things convenient for the manufacturing.
Description
Technical Field
The utility model relates to a single polarization optic fibre especially relates to the single polarization optic fibre of "a" style of calligraphy structure, belongs to optical fiber sensing technical field.
Background
In recent years, with the rapid development of high-power fiber lasers, fiber optic gyroscopes, current sensors, superluminescent light sources, and electro-optical devices, the demand for single polarization fibers having only one polarization guided mode is increasing.
In a single polarization fiber, only one of two orthogonal linear polarization modes can be transmitted, and the other mode is cut off or seriously leaked and attenuated, so that the output light of the single polarization fiber always has only one single polarization mode. Unlike polarization maintaining fibers that support two orthogonal polarization modes, single polarization fibers have many advantages: the high extinction ratio, no polarization mode dispersion, obvious polarization related loss and low polarization mismatch sensitivity can effectively reduce the polarization coupling and polarization mode dispersion of the system.
In the prior art, the following method is adopted to realize the single polarization function in the optical fiber:
① large birefringence is generated by stress induced birefringence effect of doped elliptical core/cladding, and one of the fundamental polarization modes is cut off by doping to form different core cladding refractive index difference;
② discloses a single polarization optical fiber and system and method for making auxiliary air holes in optical fiber to replace doping, such as Chinese patent document CN1809771A, which includes a roughly elliptical fiber core and air holes arranged at two opposite sides of the central fiber core, when the optical fiber is prepared, the inner diameter of the air holes is close to the fiber core, the outer diameter is close to the fiber core/cladding interface, and in the actual operation, the position of the air holes is difficult to be accurately positioned, and further such as Chinese patent CN101809476A, discloses a polarization-maintaining and single polarization optical fiber of boron-fluorine doped stress member, which includes an elliptical fiber core, a cladding and at least one stress member adjacent to the fiber core and located in the cladding, the stress member includes silicon dioxide doped with boron and fluorine, the optical fiber of the utility model adopts the boron-fluorine doped stress member to generate stress birefringence, and the area of the stress member is 10-15 μm.
In summary, the single polarization fiber in the conventional technology is mostly used for the elliptical fiber core fiber, which affects the application range, and has high manufacturing difficulty and poor consistency.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned not enough, provide a "one" style of calligraphy single polarization optic fibre, its "one" style of calligraphy stress action district that has improved temperature adaptability, and the geometric symmetry that has improved its uniformity and made things convenient for the manufacturing.
The purpose of the utility model is realized like this:
the utility model provides a "one" style of calligraphy single polarization optical fiber, optical fiber includes the fibre core, wraps up the inner cladding outside the fibre core, the both sides of inner cladding are provided with stress action district along its axial symmetry, and the cross section in stress action district is "one" font structure, inner cladding and stress action district parcel have the surrounding layer, be provided with the air pocket along its axial in the surrounding layer.
The utility model relates to a "one" style of calligraphy single polarization optic fibre, the air gas pocket is provided with a plurality ofly, and air gas pocket symmetric distribution in the both sides in stress action district, the central axis of a plurality of air gas pockets be located the coplanar and with the stress action district place plane looks vertical of "one" font structure.
The utility model relates to a "style of calligraphy single polarization optic fibre, the air gas pocket is provided with 2 ~ 6.
The utility model relates to a single polarization optical fiber shaped like a Chinese character 'yi', germanium, fluorine and phosphorus are doped in a fiber core; after germanium, fluorine and phosphorus are co-doped, the fiber core has the maximum refractive index delta percent delta 1, and delta 1 is 0.01-0.015;
the inner cladding is made of silicon dioxide doped with fluorine, and the maximum refractive index delta 2 of the inner cladding is between-0.007 and-0.003;
the stress action area is made of boron-doped silicon dioxide, and the maximum refractive index delta 3 of the stress action area is-0.008 to-0.016;
the outer cladding is made of pure silicon dioxide and has a maximum refractive index delta percent delta 4 of 0.
The utility model relates to a single polarization optical fiber in a shape of Chinese character 'yi', the maximum refractive index delta percentage of the fiber core is delta 1; the maximum refractive index delta percent of the inner cladding is delta 2; the maximum refractive index delta percent of the stress action area is delta 3; the maximum refractive index delta percent of the outer cladding is delta 4, and delta 1> delta 4> delta 2> delta 3.
The manufacturing steps of the I-shaped single polarization optical fiber are as follows:
the method comprises the following steps of firstly, pretreating a base pipe, preheating the base pipe, and eliminating impurities and bubbles on the inner wall of the base pipe;
depositing, namely sequentially performing outer cladding layer deposition, stress action region deposition, inner cladding layer deposition and core layer deposition in the base pipe;
step three, preform molding: the base pipe is subjected to forward collapse and reverse collapse to manufacture a solid I-shaped prefabricated rod;
step four, heat preservation, namely performing heat preservation treatment on the I-shaped prefabricated rod;
step five, punching, namely, axially punching the linear prefabricated rod, wherein air holes formed by punching are symmetrically positioned at two sides of the fiber core to prepare a linear single polarization optical fiber prefabricated rod with the air holes;
polishing the outer surface of the linear single polarization optical fiber perform rod with the air holes obtained in the step five;
step seven, drawing wires, namely drawing the polished I-shaped single polarization optical fiber perform rod in the step six into a thin quartz optical fiber; and applying positive pressure to the air holes while drawing;
and step eight, coating, namely coating two layers of acrylic resin optical fiber coatings on the outer surface of the drawn quartz optical fiber.
The utility model relates to a manufacturing approach of "a" style of calligraphy single polarization optic fibre, in step four, the heat preservation temperature is 700 ~ 1000 ℃, and it is long 2 ~ 6 hours to keep warm.
The utility model relates to a manufacturing approach of "a" style of calligraphy single polarization optic fibre, in step seven, the atmospheric pressure size in the leading-in air pore is 10 ~ 40 KPa.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model can keep single polarization state transmission when the signal light is the working wave band by the design of the inner microstructure of the optical fiber; meanwhile, the stress action area of the single-polarization optical fiber is in a straight shape, and the area of the stress action area is small, so that the single-polarization optical fiber has good temperature adaptability; additionally, the utility model provides a pair of "a" style of calligraphy single polarization optic fibre, its process flow is simple, realizes the degree height, just the utility model discloses the geometrical symmetry of optic fibre is good, has good batch uniformity.
Drawings
Fig. 1 is a schematic structural view of a linear single polarization fiber according to the present invention.
Fig. 2 is a schematic view of the refractive index of the linearly single-polarized fiber in the X-X direction of the present invention.
Fig. 3 is a schematic view of the refractive index of the linear single polarization fiber in the Y-Y direction.
Wherein:
a fiber core 1, an inner cladding 2, a stress action zone 3, an air hole 4 and an outer cladding 5.
Detailed Description
Referring to fig. 1 ~ 3, the utility model relates to a "style of calligraphy single polarization optic fibre, optic fibre includes fibre core 1, wraps up in the outer inner cladding 2 of fibre core 1, its characterized in that: stress action areas 3 are symmetrically arranged on two sides of the inner cladding 2 along the axial direction of the inner cladding, the cross section of each stress action area 3 is of a straight-line-shaped structure, an outer cladding 5 wraps the inner cladding 2 and the stress action areas 3, and air holes 4 are formed in the outer cladding 5 along the axial direction of the outer cladding.
Furthermore, a plurality of air holes 4 are arranged, the air holes 4 are symmetrically distributed on two sides of the stress action area 3, and the central axes of the air holes 4 are positioned on the same plane and are vertical to the plane of the stress action area 3 with the structure in the shape of a Chinese character 'yi';
furthermore, 2-6 air holes 4 are arranged;
further, the fiber core 1 is doped with germanium, fluorine and phosphorus;
as shown in fig. 2 and 3, germanium, fluorine, and phosphorus are co-doped to provide a maximum refractive index Δ 1 of the core 1, preferably Δ 1 is between about 0.01 and about 0.015;
the inner cladding 2 is preferably made of fluorine-doped silicon dioxide, wherein the maximum refractive index delta 2 of the inner cladding 2 is preferably between about-0.007 and-0.003;
the stress-inducing region 3 is preferably made of boron-doped silicon dioxide, wherein the maximum refractive index Δ percentage Δ 3 of the stress-inducing region 3 is preferably between about-0.008 and-0.016;
the outer cladding 5 is preferably made of pure silicon dioxide, wherein the maximum refractive index delta percent 4 of the outer cladding 5 is about 0.
Furthermore, the long side length A of the stress action zone 3 belongs to [30 μm, 40 μm ], the short side length B belongs to [10 μm, 15 μm ] is good, the length-width ratio A/B belongs to [2.2, 3.5] is good, and the shortest distance C from the stress action zone 3 of the one-line structure to the center of the fiber core 1 belongs to [5 μm, 10 μm ]; the diameter D of the air hole 4 is larger than 2 μm and 10 μm, and the distance E of the air hole 4 from the fiber core 1 is larger than 4 μm and 12 μm. In this embodiment, the pore diameter is preferably 10 μm and the distance from the core 1 is preferably 10 μm.
Further, the maximum refractive index Δ percentage of the core 1 is Δ 1; the maximum refractive index delta percentage of the inner cladding 2 is delta 2; the maximum refractive index Δ percentage of the stress-affected zone 3 is Δ 3; the maximum refractive index delta percent of the outer cladding 5 is delta 4, and delta 1> delta 4> delta 2> delta 3; wherein Δ 4 is 0, and Δ 3 is greater than or equal to-0.05.
The utility model relates to a "style of calligraphy single polarization optic fibre's theory of operation does: by adjusting the maximum refractive index Δ of the core 1 and the inner cladding 2, the single polarization bandwidth can be shifted to other wavelengths, and by adjusting the aperture of the air hole 4 and the distance between the air hole and the core 1, the single polarization bandwidth can be shifted to other wavelengths. In this embodiment, the single polarization bandwidth extends between 1540-1590 nm, providing a single polarization bandwidth of about 50 nm.
The manufacturing steps of the I-shaped single polarization optical fiber are as follows:
the method comprises the following steps of firstly, pretreating a base pipe, preheating the base pipe, and eliminating impurities and bubbles on the inner wall of the base pipe;
depositing, namely sequentially performing outer cladding layer deposition, stress action region deposition, inner cladding layer deposition and core layer deposition in the base pipe; after the deposition of the stress area is finished, directional etching is carried out, namely the base tube is kept from rotating, and corrosive gas containing fluorine is introduced into the base tube; moving a fire head or two fire heads which are oppositely burnt at two sides outside the base pipe back and forth along the axial direction of the base pipe;
step three, preform molding: the base pipe is subjected to forward collapse and reverse collapse to manufacture a solid I-shaped prefabricated rod;
and step four, heat preservation, namely performing heat preservation treatment on the I-shaped prefabricated rod, wherein the heat preservation temperature is 700-1000 ℃, and the heat preservation time is 2-6 hours.
Step five, punching, namely, axially punching the linear prefabricated rod, wherein air holes formed by punching are symmetrically positioned at two sides of the fiber core to prepare a linear single polarization optical fiber prefabricated rod with the air holes;
polishing the outer surface of the linear single polarization optical fiber perform rod with the air holes obtained in the step five;
step seven, drawing wires, namely drawing the polished I-shaped single polarization optical fiber perform rod in the step six into a thin quartz optical fiber; and applying positive pressure to the air holes while drawing, wherein the pressure is 10-40 KPa;
and step eight, coating, namely coating two layers of acrylic resin optical fiber coatings on the outer surface of the drawn quartz optical fiber.
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 (5)
1. The utility model provides a "style of calligraphy single polarization optical fiber, optical fiber contains fibre core (1), wraps up inner cladding (2) outside fibre core (1), its characterized in that: the stress-bearing structure is characterized in that stress action areas (3) are symmetrically arranged on two sides of the inner cladding (2) along the axial direction of the inner cladding, the cross section of each stress action area (3) is of a straight-line-shaped structure, the outer cladding (5) wraps the inner cladding (2) and the stress action areas (3), and air holes (4) are formed in the outer cladding (5) along the axial direction of the outer cladding.
2. The in-line single polarization fiber of claim 1, wherein: the air holes (4) are arranged in a plurality, the air holes (4) are symmetrically distributed on two sides of the stress action area (3), and the central axes of the air holes (4) are positioned on the same plane and are perpendicular to the plane where the stress action area (3) of the I-shaped structure is positioned.
3. The in-line single polarization fiber of claim 1, wherein: 2-6 air holes (4) are arranged.
4. The in-line single polarization fiber of claim 1, wherein: the fiber core (1) is doped with germanium, fluorine and phosphorus; after germanium, fluorine and phosphorus are co-doped, the fiber core (1) has the maximum refractive index delta percent delta 1, and the delta 1 is 0.01-0.015;
the inner cladding (2) is made of silicon dioxide doped with fluorine, and the maximum refractive index delta 2 of the inner cladding (2) is between-0.007 and-0.003;
the stress action region (3) is made of boron-doped silicon dioxide, and the maximum refractive index delta percent delta 3 of the stress action region (3) is-0.008 to-0.016;
the outer cladding (5) is made of pure silicon dioxide, the maximum refractive index delta percent delta 4 of the outer cladding (5) being 0.
5. The in-line single polarization fiber of claim 1, wherein: the maximum refractive index delta percentage of the fiber core (1) is delta 1; the maximum refractive index delta percentage of the inner cladding (2) is delta 2; the maximum refractive index delta percentage of the stress action region (3) is delta 3; the maximum refractive index delta percent of the outer cladding (5) is delta 4, and delta 1> delta 4> delta 2> delta 3.
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| CN201920844979.9U CN210166530U (en) | 2019-06-05 | 2019-06-05 | Linear single polarization optical fiber |
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| CN201920844979.9U CN210166530U (en) | 2019-06-05 | 2019-06-05 | Linear single polarization optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596151A (en) * | 2020-11-24 | 2021-04-02 | 法尔胜泓昇集团有限公司 | Erbium-doped polarization-maintaining active optical fiber and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596151A (en) * | 2020-11-24 | 2021-04-02 | 法尔胜泓昇集团有限公司 | Erbium-doped polarization-maintaining active optical fiber and preparation method thereof |
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Effective date of registration: 20211117 Address after: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Patentee after: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Address before: 214431 No. 278, Chengjiang Middle Road, Jiangyin City, Wuxi City, Jiangsu Province Patentee before: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Patentee before: WUXI FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Patentee before: FASTEN GROUP Co.,Ltd. |