CN111635126A - Preparation process and preparation device of multi-core single-mode/multi-core few-mode communication optical fiber - Google Patents
Preparation process and preparation device of multi-core single-mode/multi-core few-mode communication optical fiber Download PDFInfo
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Abstract
The invention discloses a preparation process and a preparation device of a multi-core single-mode/multi-core few-mode communication optical fiber, wherein a plurality of fiber cores are arranged at intervals, the fiber cores are parallel, and three adjacent fiber cores form a regular triangle structure; then, first quartz glass rods are tightly filled in gaps among the fiber cores, and all the fiber cores and all the first quartz glass rods are tightly arranged to form a hexagonal stack structure; sleeving a quartz glass sleeve outside the stack structure to obtain an optical fiber perform; performing optical fiber drawing on the optical fiber preform, actively and precisely controlling gas pressure at each position in a stack structure in the optical fiber preform in the optical fiber drawing process, and controlling the diameter and numerical aperture of each fiber core in the stack structure to enable the fiber core to support single mode or few mode, so as to obtain a multi-core single mode or multi-core few mode communication optical fiber; the method has the advantages that all fiber cores in the prepared multi-core single-mode or multi-core few-mode communication optical fiber can be ensured to be parallel to each other, and the meter-scale length can be easily realized.
Description
Technical Field
The invention relates to a preparation technology of optical fibers, in particular to a preparation process and a preparation device of a multi-core single-mode or multi-core few-mode communication optical fiber.
Background
Optical fibers are currently the carrier of global backbone networks. Fiber to the home has been realized in some regions of our country and some developed countries, so to speak, fiber has been the basic carrier in the information era, and with the rapid development of image technology, computing technology, cloud technology, wireless communication technology, and even game entertainment, the requirements for information transmission bandwidth are also continuously increased.
In the existing optical fiber communication technology, wavelength division multiplexing, time division multiplexing, frequency division multiplexing, code division multiplexing, space division multiplexing and other multiplexing technologies are mainly adopted to improve the communication bandwidth. The most advanced research is also on how to improve the communication bandwidth of various multiplexing technologies.
To date, new multiplexing techniques have not been put into practical use, and much of the potential of old multiplexing techniques has been exploited. Among the multiplexing techniques, space division multiplexing is the only one that also promotes space. Space division multiplexing used in the optical fiber communication technology at present is a multiplexing mode that a plurality of pairs of wires or optical fibers share one cable, and a plurality of optical fibers are arranged in one cable, so that the material of an outer sheath is saved, and the use is convenient. Yet another approach is to form the cores of multiple fibers in one fiber without significantly increasing the diameter of the fiber, and such a fiber having multiple cores is called a multicore fiber.
The current mainstream multicore optical fiber in the market is a 7-core optical fiber, the basic structure of the 7-core optical fiber is that 1 fiber core prefabricated rod is arranged in the middle, 6 fiber core prefabricated rods are uniformly arranged around the fiber core prefabricated rod in the middle in a satellite shape, and the 7 fiber core prefabricated rods are composed of a fiber core body with a high refractive index and a cladding layer with a low refractive index. The main preparation process of the multi-core optical fiber is that a fused fiber core prefabricated rod is inserted after a quartz glass rod is punched. The preparation method has the following problems: (1) the formation of the quartz glass is realized by a rapid cooling process of a high-temperature molten mass, the process can cause residual stress in the quartz glass, although the stress release can be realized by a low-temperature annealing mode, the stress release can not be perfectly and uniformly realized for a quartz glass rod, the rayleigh scattering in an amorphous solid is one of the reasons of material intrinsic loss, and the local burst of the quartz glass rod can be possibly caused in the punching process; (2) the drilling of the quartz glass rod is realized by using the drill bit, the overlong drill bit can possibly cause the low-frequency oscillation of the top of the drill bit by taking a fixed end as a central azimuth angle under the high-speed rotation, the conversion of the energy is a very common physical phenomenon, and the drill bit can be gradually deviated in the drilling process, so that all holes cannot be ensured to be parallel to the outer surface of the quartz glass rod; (3) the drilling of the quartz glass rod is realized by using a drill, generally speaking, the length of the drill is limited, so that the prepared multi-core optical fiber preform is limited in length and cannot meet the requirement of mass production of optical fibers, although the skilled worker proposes to simultaneously drill holes from two ends of the quartz glass rod to realize the doubling of the hole length (2 times of the length of the drill), the problem that whether the holes on two sides can be coaxially aligned exists except the problem that the holes are parallel to the outer surface of the quartz glass rod cannot be ensured. In summary, in the case of requiring a plurality of parallel holes, it is very difficult to realize multi-core through such a drilling manner, and the length of the multi-core fiber realized through drilling is only in the order of 10-20 cm at present.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation process and a preparation device of a multi-core single-mode/multi-core few-mode communication optical fiber, which can ensure that all fiber cores in the prepared multi-core single-mode or multi-core few-mode communication optical fiber are parallel to each other and can easily realize the production of an optical fiber perform rod with meter-scale length.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation process of a multi-core single-mode/multi-core few-mode communication optical fiber is characterized by comprising the following steps:
step 1: taking a fiber core as a basic unit, then arranging a plurality of basic units at intervals, enabling all the basic units to be parallel and not intersected, and enabling every two adjacent three basic units to form a regular triangle structure;
step 2: the first quartz glass rods are tightly filled in gaps among all the basic units, so that the basic units are tightly attached to the first quartz glass rods, and all the basic units and all the first quartz glass rods are tightly arranged to form a hexagonal stack structure;
and step 3: sleeving a quartz glass sleeve outside the stack structure, and ensuring that the position of each basic unit and the shape of the stack structure are kept unchanged in the subsequent operation of the stack structure to obtain an optical fiber preform; wherein, the diameter of the circumscribed circle of the stack structure is consistent with the inner diameter of the tube of the quartz glass sleeve;
and 4, step 4: and carrying out optical fiber drawing on the optical fiber preform, actively and precisely controlling gas pressure at each position in a stack structure in the optical fiber preform in the optical fiber drawing process, and controlling the diameter and numerical aperture of each fiber core in the stack structure to enable the fiber core to support a single mode or a few modes, so as to obtain the multi-core single-mode communication fiber or the multi-core few-mode communication fiber, wherein the multi-core single-mode communication fiber or the multi-core few-mode communication fiber comprises a plurality of fiber cores, a filling cladding formed by melting all the first quartz glass rods, and an outer cladding formed by melting the quartz glass sleeve and used for maintaining the structure and the strength.
In said step 2, the diameter of the first quartz glass rod used for filling is identical to the diameter of the basic unit. The diameter of the first quartz glass rod is designed to be consistent with that of the basic unit, so that the obtained stack structure is overall tidy, and the overall stability of the stack structure is ensured.
In the step 3, after the quartz glass sleeve is sleeved outside the stack structure, a second quartz glass rod for supporting is inserted into a gap between the periphery of the stack structure and the inner peripheral wall of the quartz glass sleeve. By inserting a second quartz glass rod to fill the gap between the periphery of the stack structure and the inner circumferential wall of the quartz glass sleeve, the overall stability of the stack structure can be further ensured, ensuring that the position of the basic unit and the shape of the stack structure remain unchanged during subsequent operations.
The diameter of the second quartz glass rod is smaller than that of the first quartz glass rod, and a plurality of second quartz glass rods with different diameters are inserted into the gap between each side of the stack structure and the inner peripheral wall of the quartz glass sleeve so as to minimize the residual gap. The diameter of the second silica glass rod can be calculated from the size of the gap between the periphery of the stack structure and the inner peripheral wall of the silica glass sleeve, and the second silica glass rods are arranged to minimize the gap as much as possible.
In step 2, the number of the basic units in the stack structure is 7, 19, 37, 61 or 91. The number of the basic units in a stack structure is not limited, and can be determined according to practical situations under the condition that the physical separation between the basic units is allowed on the premise that the diameters of the basic units are fixed.
In the step 1, the fiber core is composed of a fiber core body with a high refractive index and a cladding with a low refractive index, the fiber core body is a germanium-doped fiber core, and the cladding is a fluorine-doped cladding. The germanium-doped fiber core is combined with the fluorine-doped cladding, so that the effective numerical aperture of the fiber core in the prepared multi-core single-mode or multi-core few-mode communication fiber can be improved to be 0.3 or more, the difference of the effective refractive indexes of the fiber cores in the prepared multi-core single-mode or multi-core few-mode communication fiber can be improved, and the coupling among the fiber cores can be effectively inhibited.
In the step 4, the diameter and the numerical aperture of each fiber core in the stack structure are controlled to limit the support mode of each fiber core in the obtained multi-core single-mode communication fiber to 1; the diameter and the numerical aperture of each fiber core in the stack structure are controlled to limit the number of the support modes of each fiber core in the obtained multi-core few-mode communication fiber to 2-10, the effective refractive index difference is required to exist between different support modes of each fiber core, and the multiplexing can be carried out between the different support modes of each fiber core in a mode division multiplexing mode. Coupling among fiber cores in the prepared multi-core few-mode communication optical fiber can be effectively inhibited by improving the effective refractive index difference among different support modes of each fiber core.
A device for preparing a multi-core single-mode/multi-core few-mode communication optical fiber is characterized by comprising a microstructure optical fiber stack system for forming a hexagonal stack structure, a multi-channel active pneumatic control unit capable of actively and precisely controlling gas pressure at each position in the stack structure in an optical fiber preform rod in the optical fiber drawing process so as to effectively modulate the space among fiber cores, the size of the fiber cores and the air duty ratio, and an optical fiber drawing tower system for drawing the optical fiber of the optical fiber preform rod and controlling the diameter and the numerical aperture of each fiber core in the stack structure in the optical fiber drawing process so that the fiber cores support a single mode or a few modes.
The optical fiber drawing tower system comprises a preform feeding device, a high-temperature furnace, 1-5 coating and solidifying devices, an optical fiber steering guide wheel, a main traction system with a main optical fiber traction wheel capable of adjusting drawing speed and diameter of a bare optical fiber, a dancing wheel and a finished optical fiber take-up device with a take-up reel, wherein the preform feeding device provides the optical fiber preform to the high-temperature furnace, the high-temperature furnace fuses the optical fiber preform into filaments to form the bare optical fiber, the coating and solidifying device coats a high polymer material on the surface of the bare optical fiber and solidifies the optical fiber to form an optical fiber with a coating layer, the optical fiber with the coating layer enters the main traction system after passing through the optical fiber steering guide wheel, and the main optical fiber traction wheel in the main traction system changes the diameter of the optical fiber with the coating layer to obtain a multi-core single-mode communication optical fiber or a multi-core few-mode communication optical fiber, and the multi-core single-mode communication optical fiber or the multi-core few-mode communication optical fiber passes through the dancing wheel and then is collected by a take-up reel in the finished product optical fiber take-up device.
The coating and curing device comprises an applicator for coating the surface of the bare fiber with the polymer material and a curing furnace for curing the polymer material coated on the surface of the bare fiber.
Compared with the prior art, the invention has the advantages that:
according to the invention, a plurality of fiber cores and a first quartz glass rod are directly arranged into a stack structure, a quartz glass sleeve is sleeved outside the stack structure, and then a multi-core single-mode or multi-core few-mode communication fiber can be prepared through fiber drawing, and the mode has the following advantages: 1) the problem of local bursting of the quartz glass rod caused by the punching process is avoided; 2) the problem of non-parallel fiber cores caused by non-parallel holes formed by punching is avoided, and the parallelism of all the fiber cores in the stack structure is very high; 3) because the punching process does not exist, only a stack structure is needed to be formed, and the optical fiber preform can easily realize the meter-scale length; 4) the distance between fiber cores and the size of the fiber cores can be adjusted; 5) coupling between fiber cores can be effectively inhibited by improving the physical separation distance between the fiber cores; 6) the optical fiber can easily realize a plurality of cores, such as 7 cores, 19 cores, 37 cores, 61 cores or 91 cores, so that the data capacity of the prepared multi-core single-mode or multi-core few-mode communication optical fiber is multiplied.
Drawings
FIG. 1a is a schematic cross-sectional view of an optical fiber preform (7 core) prepared by the preparation process of the present invention;
FIG. 1b is a schematic cross-sectional structure view of a multi-core single-mode or multi-core few-mode communication fiber (7-core) prepared by the preparation process of the present invention;
FIG. 2a is a schematic cross-sectional view of an optical fiber preform (19 core) prepared by the preparation process of the present invention;
FIG. 2b is a schematic cross-sectional structure view of a multi-core single-mode or multi-core few-mode communication fiber (19-core) prepared by the preparation process of the present invention;
FIG. 3 is a cross-sectional microscopic morphology of a multi-core few-mode communication optical fiber (37 cores) prepared by the preparation process of the present invention;
FIG. 4 is a schematic diagram showing the structure of an optical fiber drawing tower system in the manufacturing apparatus of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The first embodiment is as follows:
the preparation process of the multi-core single-mode/multi-core few-mode communication optical fiber provided by the embodiment comprises the following steps of:
step 1: a fiber core is used as a basic unit, then a plurality of basic units are arranged at intervals, all the basic units are parallel but not intersected, and every two adjacent three basic units form a regular triangle structure.
The core is composed of a core body with a high refractive index and a cladding with a low refractive index, wherein the core body is a germanium-doped core, and the cladding is a fluorine-doped cladding. The germanium-doped fiber core is combined with the fluorine-doped cladding, so that the effective numerical aperture of the fiber core in the prepared multi-core single-mode or multi-core few-mode communication fiber can be improved to be 0.3 or more, the difference of the effective refractive indexes of the fiber cores in the prepared multi-core single-mode or multi-core few-mode communication fiber can be improved, and the coupling among the fiber cores can be effectively inhibited.
Step 2: and tightly filling the first quartz glass rods in the gaps among all the basic units, so that the basic units are tightly attached to the first quartz glass rods, and forming a hexagonal stack structure by tightly arranging all the basic units and all the first quartz glass rods.
The diameter of the first quartz glass rod used for filling corresponds to the diameter of the base unit. The diameter of the first quartz glass rod is designed to be consistent with that of the basic unit, so that the obtained stack structure is overall tidy, and the overall stability of the stack structure is ensured.
Here, the number of the basic units in the stack structure is 7, 19, 37, 61 or 91, the number of the basic units in a stack structure is not limited, and the number of the basic units can be determined according to actual conditions under the condition that the diameters of the basic units are fixed and the physical separation between the basic units is allowed.
And step 3: sleeving a quartz glass sleeve outside the stack structure, and ensuring that the position of each basic unit and the shape of the stack structure are kept unchanged in the subsequent operation of the stack structure to obtain an optical fiber preform; wherein, the diameter of the circumscribed circle of stack structure is unanimous with quartz glass sheathed tube pipe diameter for the fibre core that is located stack structure angle and quartz glass sheathed tube pipe wall butt, and then make stack structure can not rock in quartz glass sleeve.
After the quartz glass sleeve is sleeved outside the stack structure, a second quartz glass rod for supporting is inserted into a gap between the periphery of the stack structure and the inner peripheral wall of the quartz glass sleeve. By inserting a second quartz glass rod to fill the gap between the periphery of the stack structure and the inner circumferential wall of the quartz glass sleeve, the overall stability of the stack structure can be further ensured, ensuring that the position of the basic unit and the shape of the stack structure remain unchanged during subsequent operations.
Here, the diameter of the second quartz glass rod is smaller than that of the first quartz glass rod, and a plurality of second quartz glass rods of different diameters are inserted into the gap between each side of the stack structure and the inner circumferential wall of the quartz glass sleeve to minimize the remaining gap. The diameter of the second silica glass rod can be calculated from the size of the gap between the periphery of the stack structure and the inner peripheral wall of the silica glass sleeve, and the second silica glass rods are arranged to minimize the gap as much as possible.
FIG. 1a shows a schematic cross-sectional structure of a 7-core optical fiber preform, and FIG. 2a shows a schematic cross-sectional structure of a 19-core optical fiber preform. In fig. 1a and 2a, 41 is a core body, 42 is a cladding, 43 is a first silica glass rod, 44 is a second silica glass rod, and 45 is a silica glass sleeve.
And 4, step 4: and carrying out optical fiber drawing on the optical fiber preform, actively and precisely controlling gas pressure at each position in a stack structure in the optical fiber preform in the optical fiber drawing process, and controlling the diameter and numerical aperture of each fiber core in the stack structure to enable the fiber core to support a single mode or a few modes, so as to obtain the multi-core single-mode communication fiber or the multi-core few-mode communication fiber, wherein the multi-core single-mode communication fiber or the multi-core few-mode communication fiber comprises a plurality of fiber cores, a filling cladding formed by fusing all first quartz glass rods and all second quartz glass rods, and an outer cladding formed by fusing quartz glass sleeves and used for maintaining structure and strength.
Controlling the diameter and numerical aperture of each fiber core in the stack structure to limit the support mode of each fiber core in the obtained multi-core single-mode communication optical fiber to 1; the diameter and the numerical aperture of each fiber core in the stack structure are controlled to limit the number of the support modes of each fiber core in the obtained multi-core few-mode communication fiber to 2-10, the effective refractive index difference is required to exist between different support modes of each fiber core, and the multiplexing can be carried out between the different support modes of each fiber core in a mode division multiplexing mode. Coupling among fiber cores in the prepared multi-core few-mode communication optical fiber can be effectively inhibited by improving the effective refractive index difference among different support modes of each fiber core.
Fig. 1b shows a schematic cross-sectional structure diagram of the prepared 7-core single-mode or few-mode communication optical fiber, and fig. 2b shows a schematic cross-sectional structure diagram of the prepared 19-core single-mode or few-mode communication optical fiber. In fig. 1b and 2b, 51 is the core body of the core in the prepared multi-core single-mode or multi-core few-mode communication fiber, 52 is the cladding of the core in the prepared multi-core single-mode or multi-core few-mode communication fiber, 53 is the filling cladding, and 54 is the outer cladding.
Fig. 3 shows the cross-sectional microscopic morphology of the prepared 37-core few-mode communication optical fiber, wherein light-color spot-shaped areas in fig. 3 are a plurality of core bodies, and dark-color areas are low-refractive-index claddings.
Example two:
the embodiment provides a preparation apparatus for implementing a preparation process of a multicore single-mode/multicore few-mode communication optical fiber according to the embodiment, as shown in fig. 4, the apparatus includes a microstructure optical fiber stack system (not shown in the figure) for forming a hexagonal stack structure, a multichannel active air control unit 1 capable of actively and precisely controlling air pressure at each position in the stack structure in an optical fiber preform rod during an optical fiber drawing process to effectively modulate a space between fiber cores, a size of the fiber cores, and an air duty ratio, and an optical fiber drawing tower system 2 for performing optical fiber drawing on the optical fiber preform rod and controlling a diameter and a numerical aperture of each fiber core in the stack structure during the optical fiber drawing process to enable the fiber cores to support a single mode or a few modes.
In this embodiment, the optical fiber drawing tower system 2 comprises a preform feeding device 21, a high temperature furnace 22, 1-5 coating and solidifying devices 23, an optical fiber turning and guiding wheel 24, a main traction system 25 having a main optical fiber traction wheel 251 capable of adjusting the drawing speed and adjusting the diameter of a bare optical fiber, a dancing wheel 26, and a finished optical fiber take-up device 27 having a take-up reel 271, wherein the preform feeding device 21 provides the optical fiber preform 31 to the high temperature furnace 22, the high temperature furnace 22 melts the optical fiber preform 31 into a filament to form a bare optical fiber 32, the coating and solidifying device 23 coats a polymer material on the surface of the bare optical fiber 32 and solidifies the optical fiber 33 having a coating layer, the optical fiber 33 having the coating layer enters the main traction system 25 through the optical fiber turning and guiding wheel 24, the main optical fiber traction wheel 251 in the main traction system 25 changes the diameter of the optical fiber 33 having the coating layer to obtain a multi-core or single-mode or few-mode, the multi-core single-mode or multi-core few-mode communication optical fiber 34 passes through the dancing wheel 26 and is collected by a take-up reel 271 in the finished optical fiber take-up device 27.
In the present embodiment, 2 coating and curing devices 23 are used, and each coating and curing device 23 includes an applicator 231 for coating a polymer material on the surface of the bare fiber 32 and a curing oven 232 for curing the polymer material coated on the surface of the bare fiber 32.
The above-described microstructured optical fiber stack system can be realized by a conventional technique, and any system capable of arranging all the basic cells and all the first silica glass rods in a hexagonal stack structure can be used; the multichannel active pneumatic control unit 1 adopts the prior art, and the value of the gas pressure at each position in the stack structure in the optical fiber preform rod 31 controlled by the multichannel active pneumatic control unit 1 is determined according to the space between fiber cores, the size of the fiber cores and the like required by the multi-core few-mode communication optical fiber to be prepared; the preform feeding device 21 employs an existing feeding apparatus; the high temperature furnace 22, the applicator 231, the curing furnace 232, the optical fiber steering guide wheel 24 and the dancing wheel 26 all adopt the prior art; the operating temperature of the high temperature furnace 22, the curing temperature of the curing furnace 232 and other required process parameters are adjusted or adjusted as appropriate according to the process parameters used in the conventional optical fiber drawing.
Claims (10)
1. A preparation process of a multi-core single-mode/multi-core few-mode communication optical fiber is characterized by comprising the following steps:
step 1: taking a fiber core as a basic unit, then arranging a plurality of basic units at intervals, enabling all the basic units to be parallel and not intersected, and enabling every two adjacent three basic units to form a regular triangle structure;
step 2: the first quartz glass rods are tightly filled in gaps among all the basic units, so that the basic units are tightly attached to the first quartz glass rods, and all the basic units and all the first quartz glass rods are tightly arranged to form a hexagonal stack structure;
and step 3: sleeving a quartz glass sleeve outside the stack structure, and ensuring that the position of each basic unit and the shape of the stack structure are kept unchanged in the subsequent operation of the stack structure to obtain an optical fiber preform; wherein, the diameter of the circumscribed circle of the stack structure is consistent with the pipe diameter of the quartz glass sleeve;
and 4, step 4: and carrying out optical fiber drawing on the optical fiber preform, actively and precisely controlling gas pressure at each position in a stack structure in the optical fiber preform in the optical fiber drawing process, and controlling the diameter and numerical aperture of each fiber core in the stack structure to enable the fiber core to support a single mode or a few modes so as to obtain the multi-core single-mode communication fiber or the multi-core few-mode communication fiber, wherein the multi-core single-mode communication fiber or the multi-core few-mode communication fiber comprises a plurality of fiber cores, a filling cladding formed by melting all the first quartz glass rods, and an outer cladding formed by melting the quartz glass sleeve and used for maintaining the structure and the strength.
2. The process according to claim 1, wherein the diameter of the first silica glass rod used for filling in step 2 is the same as the diameter of the basic unit.
3. The process according to claim 1 or 2, wherein in step 3, after the quartz glass sleeve is sleeved outside the stack structure, a second quartz glass rod for supporting is inserted into a gap between the periphery of the stack structure and the inner peripheral wall of the quartz glass sleeve.
4. The process according to claim 3, wherein the diameter of the second silica glass rod is smaller than that of the first silica glass rod, and a plurality of second silica glass rods with different diameters are inserted into the gap between each side of the stack structure and the inner peripheral wall of the silica glass sleeve to minimize the residual gap.
5. The process according to claim 1, wherein in step 2, the number of the basic units in the stack structure is 7, 19, 37, 61 or 91.
6. The process according to claim 1, wherein in step 1, the core is composed of a core body with a high refractive index and a cladding with a low refractive index, the core body is a germanium-doped core, and the cladding is a fluorine-doped cladding.
7. The process according to claim 6, wherein in step 4, the diameter and numerical aperture of each core in the stack structure are controlled to limit the supported mode of each core in the obtained multicore single-mode communication fiber to 1; the diameter and the numerical aperture of each fiber core in the stack structure are controlled to limit the number of the support modes of each fiber core in the obtained multi-core few-mode communication fiber to 2-10, the effective refractive index difference is required to exist between different support modes of each fiber core, and the multiplexing can be carried out between the different support modes of each fiber core in a mode division multiplexing mode.
8. A device for preparing a multi-core single-mode/multi-core few-mode communication optical fiber is characterized by comprising a microstructure optical fiber stack system for forming a hexagonal stack structure, a multi-channel active pneumatic control unit capable of actively and precisely controlling gas pressure at each position in the stack structure in an optical fiber preform rod in the optical fiber drawing process so as to effectively modulate the space among fiber cores, the size of the fiber cores and the air duty ratio, and an optical fiber drawing tower system for drawing the optical fiber of the optical fiber preform rod and controlling the diameter and the numerical aperture of each fiber core in the stack structure in the optical fiber drawing process so that the fiber cores support a single mode or a few modes.
9. The apparatus as claimed in claim 8, wherein the optical fiber drawing tower system comprises a preform feeding device, a high temperature furnace, 1-5 coating/curing devices, an optical fiber turning/guiding wheel, a main drawing system with a main fiber drawing wheel capable of adjusting drawing speed and bare fiber diameter, a dancing wheel, and a finished fiber take-up device with a take-up reel, wherein the preform feeding device provides the optical fiber preform to the high temperature furnace, the high temperature furnace fuses the optical fiber preform into a bare fiber, the coating/curing device coats a polymer material on the surface of the bare fiber and cures the fiber to form an optical fiber with a coating layer, and the optical fiber with the coating layer enters the main drawing system after passing through the optical fiber turning/guiding wheel, and the main optical fiber traction wheel in the main traction system changes the diameter of the optical fiber with the coating layer to obtain the multi-core single-mode communication optical fiber or the multi-core few-mode communication optical fiber, and the multi-core single-mode communication optical fiber or the multi-core few-mode communication optical fiber is collected by a take-up reel in the finished optical fiber take-up device after passing through the dancing wheel.
10. The apparatus according to claim 9, wherein the coating and curing device comprises an applicator for coating a polymer material on the surface of the bare fiber and a curing oven for curing the polymer material coated on the surface of the bare fiber.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112346170A (en) * | 2020-09-21 | 2021-02-09 | 燕山大学 | Double-groove surrounding type multi-core few-mode optical fiber based on space division-mode division multiplexing technology |
| CN112979155A (en) * | 2021-01-14 | 2021-06-18 | 艾菲博(宁波)光电科技有限责任公司 | Eccentric optical fiber stack preparation method and device |
| CN113149422A (en) * | 2021-01-14 | 2021-07-23 | 艾菲博(宁波)光电科技有限责任公司 | Method and device for preparing high-duty-ratio multi-core microstructure communication optical fiber |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003081656A (en) * | 2001-09-10 | 2003-03-19 | Mitsubishi Cable Ind Ltd | Method of manufacturing photonic crystal fiber |
| US6598428B1 (en) * | 2000-09-11 | 2003-07-29 | Schott Fiber Optics, Inc. | Multi-component all glass photonic band-gap fiber |
| US20110141555A1 (en) * | 2007-09-26 | 2011-06-16 | Imra America, Inc. | Auto-cladded large-core optical fibers |
| CN103936277A (en) * | 2014-03-20 | 2014-07-23 | 富通集团有限公司 | Multi-core optical fiber manufacturing method |
| WO2015077021A1 (en) * | 2013-11-22 | 2015-05-28 | Imra America, Inc | Polarizing and polarization maintaining leakage channel fibers |
| WO2017197957A1 (en) * | 2016-05-17 | 2017-11-23 | 烽火通信科技股份有限公司 | Ultrafine polarization-maintaining optical fiber for use in fiber optic gyroscope and manufacturing method for optical fiber |
| CN207760229U (en) * | 2017-12-25 | 2018-08-24 | 北京玻璃研究院 | A kind of photon crystal optical fiber preformed rod structure |
| CN110300906A (en) * | 2017-06-16 | 2019-10-01 | 直观外科手术操作公司 | Optical fiber with integrated absorbing material |
| EP3562064A1 (en) * | 2018-04-27 | 2019-10-30 | Institut Mines-Telecom | Methods and devices for the determination of core dependent loss in multi-core fiber transmission systems |
| JP2020019680A (en) * | 2018-08-01 | 2020-02-06 | 株式会社フジクラ | Method for manufacturing multicore fiber preform and method for manufacturing multicore fiber |
| CN110927863A (en) * | 2019-12-10 | 2020-03-27 | 东北大学 | Multi-core few-mode micro-structure optical fiber used in space division-mode division multiplexing field |
-
2020
- 2020-04-21 CN CN202010316453.0A patent/CN111635126A/en not_active Withdrawn
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6598428B1 (en) * | 2000-09-11 | 2003-07-29 | Schott Fiber Optics, Inc. | Multi-component all glass photonic band-gap fiber |
| JP2003081656A (en) * | 2001-09-10 | 2003-03-19 | Mitsubishi Cable Ind Ltd | Method of manufacturing photonic crystal fiber |
| US20110141555A1 (en) * | 2007-09-26 | 2011-06-16 | Imra America, Inc. | Auto-cladded large-core optical fibers |
| WO2015077021A1 (en) * | 2013-11-22 | 2015-05-28 | Imra America, Inc | Polarizing and polarization maintaining leakage channel fibers |
| CN103936277A (en) * | 2014-03-20 | 2014-07-23 | 富通集团有限公司 | Multi-core optical fiber manufacturing method |
| WO2017197957A1 (en) * | 2016-05-17 | 2017-11-23 | 烽火通信科技股份有限公司 | Ultrafine polarization-maintaining optical fiber for use in fiber optic gyroscope and manufacturing method for optical fiber |
| CN110300906A (en) * | 2017-06-16 | 2019-10-01 | 直观外科手术操作公司 | Optical fiber with integrated absorbing material |
| CN207760229U (en) * | 2017-12-25 | 2018-08-24 | 北京玻璃研究院 | A kind of photon crystal optical fiber preformed rod structure |
| EP3562064A1 (en) * | 2018-04-27 | 2019-10-30 | Institut Mines-Telecom | Methods and devices for the determination of core dependent loss in multi-core fiber transmission systems |
| JP2020019680A (en) * | 2018-08-01 | 2020-02-06 | 株式会社フジクラ | Method for manufacturing multicore fiber preform and method for manufacturing multicore fiber |
| CN110927863A (en) * | 2019-12-10 | 2020-03-27 | 东北大学 | Multi-core few-mode micro-structure optical fiber used in space division-mode division multiplexing field |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112346170A (en) * | 2020-09-21 | 2021-02-09 | 燕山大学 | Double-groove surrounding type multi-core few-mode optical fiber based on space division-mode division multiplexing technology |
| CN112346170B (en) * | 2020-09-21 | 2022-03-25 | 燕山大学 | Double-groove surrounding type multi-core few-mode optical fiber based on space division-mode division multiplexing technology |
| CN112979155A (en) * | 2021-01-14 | 2021-06-18 | 艾菲博(宁波)光电科技有限责任公司 | Eccentric optical fiber stack preparation method and device |
| CN113149422A (en) * | 2021-01-14 | 2021-07-23 | 艾菲博(宁波)光电科技有限责任公司 | Method and device for preparing high-duty-ratio multi-core microstructure communication optical fiber |
| CN113979631A (en) * | 2021-10-12 | 2022-01-28 | 桂林电子科技大学 | Preparation method of large-size multi-core optical fiber preform based on perfect combination of special-shaped sleeves |
| CN113979631B (en) * | 2021-10-12 | 2023-10-03 | 桂林电子科技大学 | Preparation method of large-size multi-core optical fiber preform based on perfect combination of special-shaped sleeves |
| CN115047566A (en) * | 2022-06-28 | 2022-09-13 | 东北大学 | Method for preparing space division multiplexing/demultiplexing device for multi-core optical fiber |
| CN115959824A (en) * | 2022-12-22 | 2023-04-14 | 长飞光纤光缆股份有限公司 | Glass fiber preparation equipment and method and quartz image transmission optical fiber preparation method |
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