CN114114549B - WDM coupling device of annular multi-core optical fiber and preparation method thereof - Google Patents
WDM coupling device of annular multi-core optical fiber and preparation method thereof Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 108
- 230000008878 coupling Effects 0.000 title claims abstract description 86
- 238000010168 coupling process Methods 0.000 title claims abstract description 86
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 238
- 238000005086 pumping Methods 0.000 claims abstract description 80
- 238000005253 cladding Methods 0.000 claims description 17
- 239000011247 coating layer Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
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- 230000007547 defect Effects 0.000 description 2
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- 238000005498 polishing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/245—Removing protective coverings of light guides before coupling
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
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Abstract
The invention discloses a WDM coupling device of ring-shaped multi-core optical fibers and a preparation method thereof, wherein the device comprises a left sleeve, a right sleeve, a plurality of single-mode optical fibers and a multi-mode optical fiber; the multimode fiber is used as a pumping fiber; a plurality of grooves are uniformly processed around the center of the pump fiber core around the pump fiber core; the right-end fiber cores of the single-mode fibers are respectively inserted into a plurality of grooves of the pumping fibers, the right-end fiber cores of the single-mode fibers and the fiber cores of the multi-core active fibers welded at the right end of the coupling device can be respectively matched one by one, and the right sleeve is sleeved on the right-end fiber cores of the single-mode fibers and the pumping fibers and is heated and collapsed to form the right end of the coupling device; the left end fiber cores of the single-mode fibers are arranged to be matched with the fiber cores of the multi-core passive fibers welded with the left ends of the coupling devices one by one, and the left sleeve is sleeved on the left end fiber cores of the single-mode fibers and is heated and collapsed to form the left ends of the coupling devices. The invention can amplify the signal light passing through the WDM coupling device and improve the coupling efficiency.
Description
Technical Field
The invention relates to the technical field of optical fiber communication and functional devices, in particular to a WDM coupling device of a ring-shaped multi-core optical fiber and a preparation method thereof.
Background
With the increasing maturity of internet technology, there is an increasing demand for data, and conventional Single Mode Fibers (SMFs) for transmitting signals have gradually failed to meet the demand for communication due to relatively small information capacity of transmission caused by small mode channels, large intermode dispersion and the like. The multi-core optical fiber can effectively increase the transmission capacity of a single optical fiber by greatly improving the space utilization rate of the optical fiber, so that the Space Division Multiplexing (SDM) technology of the multi-core optical fiber (MCF) can multiply increase the number of channel transmissions on the basis of the traditional optical fiber, thereby well solving the problem of mass information transmission. However, current SDM techniques suffer from high cost, low pump coupling efficiency, low system integration, and high process complexity. The research of a novel high-efficiency multi-core pumping signal coupling device is very important-!
At present, the preparation technology of the multi-core pumping signal coupling device generally uses lens coupling, tapering coupling and quartz tube side pumping coupling, the prior art has the advantages and disadvantages that the coupling of multi-core pumping signals is realized by a lens coupling mode, the technology firstly uses a dichroic mirror to transmit pumping light, then the pumping light enters a laser cavity through a lens to oscillate back and forth, finally the signal light and the pumping light are separated through the dichroic mirror, the method has the advantages of good tunability, but the disadvantages are obvious that the realization of the transmission of the signal light and the coupling of the pumping light is not realized by the multi-core at the same time, and the loss among optical elements is overlarge, so that the coupling efficiency is low, in order to overcome the problem, the technical staff invents tapering coupling, firstly, the signal optical fibers are arranged among a plurality of pumping optical fibers, and are fixed into a beam in the mode; then melt tapering, make the waist diameter of the cone close to the signal optical fiber, then cut from the waist of the cone vertically, finally, through the accurate adjustment of position, realize the fiber core is butted, the practice proves that this kind of method can reduce the loss of signal light transmission after using, has promoted the coupling efficiency of the light of single wavelength, but with this application of technology, people find that for the little mode optical fiber of multicore, tapering mode can make the signal optical mode distort, further reduce the coupling efficiency of the higher-order mode, and the active optical fiber can be damaged because of the unable emission of heat while working, in order to solve this problem, the side pumping coupling of quartz tube after is improved on the basis of this method, through using the quartz tube to make up the light of multiple pumps, will not break the active optical fiber core, will not influence the mechanical stability of the optic fibre either, but this method is high in manufacturing cost, the process is complicated.
Disclosure of Invention
In view of the above, the present invention provides a WDM coupling device for ring-shaped multi-core optical fibers and a method for manufacturing the same, which can uniformly distribute the energy of the pump light into each core by adjusting the position and the size of the core of the pump optical fiber, so as to not only improve the coupling efficiency, but also realize the energy amplification, solve the problem of low coupling efficiency of the WDM coupling device for single-core optical fibers in the market, and the device is not limited to single-core pumping, can be multi-core pumping, is not limited to four-core pumping, can be any multi-core pumping, and can directly enter the active fiber cladding in the same device as the core size of the signal core is unchanged, thereby avoiding the distortion of the signal in the tapering process.
The invention solves the problems by the following technical means:
In one aspect, the invention provides a WDM coupling device for a ring-shaped multicore fiber, including a left ferrule, a right ferrule, a plurality of single-mode fibers and a multimode fiber; the multimode fiber is used as a pumping fiber and is used for pumping light;
Removing the coating layer and the cladding layer at the right ends of the single-mode optical fiber and the pump optical fiber; a plurality of grooves are uniformly processed around the center of the pumping optical fiber core around the pumping optical fiber core, the number of the grooves is consistent with that of the single-mode optical fibers, and the diameter of each groove is matched with the diameter of the fiber core at the right end of the single-mode optical fibers;
The right-end fiber cores of the single-mode fibers are respectively inserted into the grooves of the pumping fibers one by one, the right-end fiber cores of the single-mode fibers and the fiber cores of the multi-core active fibers welded at the right end of the coupling device can be respectively matched one by one, the right sleeve is sleeved on the right-end fiber cores of the single-mode fibers and the pumping fibers, and the right-end fiber cores of the coupling device are formed by heating and collapsing, so that the pumping light can be conveniently and uniformly dispersed into the active fiber cores of signal light transmission by welding with the subsequent multi-core active fibers, and signal amplification is further realized;
Removing a coating layer and part or all of a cladding layer at the left end of the single-mode optical fiber; the left end fiber cores of the single-mode fibers are arranged to be matched with the fiber cores of the multi-core passive fibers welded with the left ends of the coupling devices one by one, the left sleeve is sleeved on the left end fiber cores of the single-mode fibers, and the left end of the coupling devices is formed by heating and collapsing, so that the multi-core passive fibers can be welded with the multi-core passive fibers conveniently to realize the input of multi-core signals.
Further, the single-mode fiber core diameter is more than 7 μm and less than 10 μm; the interval between the fiber cores of adjacent single-mode fibers is more than 20 mu m and less than 50 mu m; the diameter of the fiber core of the multimode optical fiber is larger than 20 μm and smaller than 100 μm.
On the other hand, the invention provides a preparation method of the WDM coupling device of the annular multi-core optical fiber, which comprises the following steps:
Step 1: selecting a plurality of single-mode fibers and a multimode fiber, wherein the mode fields of the single-mode fibers are consistent, and the multimode fiber is used as a pumping fiber for pumping light; removing the coating layer and part or all of the cladding layer at the left end of the single-mode optical fiber; removing the coating layer and the cladding at the right ends of the single-mode optical fiber and the pump optical fiber;
Step 2: micro-hole processing is carried out on the fiber core at the right end of the pumping optical fiber, a plurality of grooves are uniformly processed around the center of the pumping optical fiber core around the pumping optical fiber core, the number of the grooves is consistent with that of the single-mode optical fibers, and the diameter of each groove is matched with that of the fiber core at the right end of the single-mode optical fibers;
Step 3: the right-end fiber cores of the single-mode fibers are respectively inserted into the grooves of the pumping fibers one by utilizing micro-platform operation, the right-end fiber cores of the single-mode fibers and the fiber cores of the multi-core active fibers welded at the right end of the coupling device can be respectively matched one by one, the right-end fiber cores are sleeved by the right sleeve, and the right end of the coupling device is formed by heating and collapsing, so that the pumping light can be conveniently and uniformly dispersed into the active fiber cores of the signal light transmission by welding with the subsequent multi-core active fibers, and further signal amplification is realized; the left end fiber cores of the single-mode fibers are arranged to be matched with the fiber cores of the multi-core passive fibers welded with the left ends of the coupling devices one by one, the multi-core passive fibers are sleeved by the left sleeves, and the left ends of the coupling devices are formed by heating and collapsing, so that the multi-core passive fibers are welded with the multi-core passive fibers conveniently to realize the input of multi-core signals.
Further, in step 1, the multimode fiber is used as a pump fiber for pumping 980nm pump light.
In the step 1, a wire stripper is used for stripping a coating layer at the left end of the single-mode fiber, and then a hydrofluoric acid solution with the volume fraction of 10-50% is used for corroding part or all of a cladding at the left end of the single-mode fiber; and stripping the coating layers at the right ends of the single-mode fiber and the pump fiber by using a wire stripper, and corroding the cladding layers at the right ends of the single-mode fiber and the pump fiber by using a hydrofluoric acid solution with the volume fraction of 10-50%.
Further, after step 1, the treated optical fibers are ultrasonically cleaned with absolute ethyl alcohol for 5 to 10 minutes, and then the end surfaces of the optical fibers are cleaned with dust-free dipping with absolute ethyl alcohol.
Further, in step 2, the right end of the pump fiber is micro-porous by using the femtosecond laser, and a plurality of grooves are uniformly formed around the center of the pump fiber by using the intense laser around the pump fiber, wherein the diameter of the grooves is 50-70 μm.
In step 3, after the cores at the right ends of the single-mode fibers are respectively inserted into the grooves of the pump fibers one by one, filling low-refractive-index glue in the gaps between the cores at the right ends of the single-mode fibers and the grooves, and irradiating for 10-20 minutes in an ultraviolet light environment to fully solidify the low-refractive-index glue.
Further, in step3, the left sleeve and the right sleeve are tapered capillaries.
Further, after the step 3, polishing the optical fiber bundle and the optical fiber bundle sleeve of the coupling device together, so that the end surfaces of the optical fiber bundle and the optical fiber bundle sleeve are overlapped on the same plane, the end surfaces are flat, free of cracks, impurities and defects, and the end surfaces are cleaned by using dust-free paper dipped with absolute ethyl alcohol.
Compared with the prior art, the invention has the beneficial effects that at least:
1. the invention arranges a plurality of single-mode fiber cores in the pumping fiber, and the crosstalk between the single-mode fiber cores is low, thereby inhibiting the super-mode crosstalk between the single-mode fiber cores.
2. The invention can amplify the signal light passing through the WDM coupling device, and improves the coupling efficiency by changing the size and the position of the fiber core of the pumping fiber.
3. The WDM coupling device has low preparation cost, flexible device manufacturing scheme, is not limited to single-core pumping, can be used for multi-core pumping, is not limited to four-core pumping, and can be used for any multi-core pumping, and the fiber core and the signal core are arranged in the same device, so that the distortion of signals in the tapering process is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a WDM coupling device for a ring-type multi-core optical fiber of the present invention;
Fig. 2 is a flow chart of a method of manufacturing a WDM coupling device for a ring-type multicore fiber of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the following detailed description of the technical solution of the present invention refers to the accompanying drawings and specific embodiments. It should be noted that the described embodiments are only some embodiments of the present invention, and not all embodiments, and that all other embodiments obtained by persons skilled in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
Example 1
As shown in fig. 1, the present invention provides a WDM coupling device for a ring-shaped multi-core optical fiber, which takes a WDM coupling device for a ring-shaped five-core optical fiber as an example, and includes a left ferrule, a right ferrule, four single-mode optical fibers and a multi-mode optical fiber; the multimode fiber is used as a pumping fiber for pumping 980nm pumping light;
removing the coating layer and the cladding layer at the right ends of the single-mode optical fiber and the pump optical fiber; four grooves are uniformly formed around the center of the pumping optical fiber core around the pumping optical fiber core, and the diameter of each groove is matched with the diameter of the fiber core at the right end of the single-mode optical fiber;
The right-end fiber cores of the four single-mode fibers are respectively inserted into the four grooves of the pumping optical fibers one by one, the right-end fiber cores of the four single-mode fibers and the fiber cores of the four-core active optical fibers welded at the right end of the coupling device can be respectively matched one by one, the right sleeve is sleeved on the right-end fiber cores of the four single-mode fibers and the pumping optical fibers, and the right-end fiber cores of the coupling device are formed by heating and collapsing, so that pumping light can be conveniently and uniformly dispersed into the four active fiber cores of signal light transmission by welding with the subsequent four-core active optical fibers, and signal amplification is further realized;
Removing a coating layer and part or all of a cladding layer at the left end of the single-mode optical fiber; the left fiber cores of the four single-mode fibers are arranged to be matched with the fiber cores of the four-core passive fibers welded with the left end of the coupling device one by one, the left sleeve is sleeved on the left fiber cores of the four single-mode fibers, and the left end of the coupling device is formed by heating and collapsing, so that the four-core passive fibers can be welded with the four-core passive fibers conveniently to realize the input of four-core signals.
Specifically, the diameter of the fiber core of the single-mode fiber is more than 7 μm and less than 10 μm; the interval between the fiber cores of adjacent single-mode fibers is more than 20 mu m and less than 50 mu m; the diameter of the fiber core of the multimode optical fiber is larger than 20 μm and smaller than 100 μm.
When a signal enters the WDM coupling device through the four-core passive optical fiber, the front end of the WDM coupling device is four common single-mode optical fibers, so that the signal is not amplified as if the signal passes through the optical fiber normally when passing through the front end of the WDM coupling device, and when the signal passes through the rear end of the WDM coupling device, the rear end is equivalent to an end pump, 980nm pump light can be uniformly distributed into the fiber core of each signal optical fiber, the coupling efficiency is greatly improved, the whole WDM coupling device has the function of amplifying the optical power of the signal, and if the end pump of the traditional spatial light modulation is used, the energy of the pump light is not uniformly distributed into each core, so that the coupling efficiency is fully improved compared with the change of the invention, and the effect is as same as that of single-mode WDM on the market, but the invention is the multi-core WDM coupling device, which can make different structural adjustments on the size of the pump fiber cores, so that the cross talk between adjacent fiber cores can be reduced, and the coupling efficiency is further improved. In addition, the invention does not need to draw the cone, so the distortion of the signal in the process of drawing the cone is avoided.
Example 2
As shown in fig. 2, the present invention provides a method for preparing a WDM coupling device for a ring-type multicore fiber, comprising the steps of: 1. pretreatment of the multi-core optical fiber; 2. femtosecond laser processing of the pumping fiber core; 3. forming a coupling device under the operation of the micro platform; the embodiment takes the preparation of a WDM coupling device of a five-core optical fiber as an example, and the detailed manufacturing method thereof can be carried out according to the following steps:
Step 1: firstly, selecting optical fibers meeting the conditions, such as single-mode optical fibers and multimode optical fibers with the length of 0.5-1 m, wherein four single-mode optical fibers are required to be selected, the mode fields of the single-mode optical fibers are consistent, one multimode optical fiber is selected, and the multimode optical fiber is used as a pumping optical fiber and is used for pumping 980nm pumping light; stripping a coating layer at the left end of the single-mode fiber by using a wire stripper, and corroding part or all of a cladding at the left end of the single-mode fiber by using a hydrofluoric acid solution with the volume fraction of 10-50%; stripping the coating layer at the right ends of the single-mode fiber and the pumping fiber by using a wire stripper, corroding the cladding at the right ends of the single-mode fiber and the pumping fiber by using a hydrofluoric acid solution with the volume fraction of 10-50%, ultrasonically cleaning the treated fiber for 5-10 minutes by using absolute ethyl alcohol after finishing the work, and cleaning the end face of the fiber by using dust-free dipped with the absolute ethyl alcohol;
Step 2: then micro-hole processing is carried out on the fiber core at the right end of the pumping fiber by using femtosecond laser, four grooves are uniformly processed around the center of the pumping fiber core around the pumping fiber core by using strong laser, the diameter of each groove is 50-70 mu m, and the diameter of each groove is matched with the diameter of the fiber core at the right end of the single-mode fiber after corrosion treatment;
step 3: the right-end fiber cores of the four single-mode fibers are respectively inserted into four grooves of the pumping optical fibers one by utilizing micro-platform operation, the right-end fiber cores of the four single-mode fibers and the fiber cores of the four-core active optical fibers welded at the right end of the WDM coupling device can be respectively matched one by one, low-refractive-index glue is filled in gaps between the fiber cores at the right end of the single-mode fibers and the grooves, the low-refractive-index glue is irradiated for 10-20 minutes in an ultraviolet light environment, the low-refractive-index glue is fully solidified, then the right sleeve of the tapered capillary tube is sleeved, and the right end of the coupling device is formed by heating and collapsing, so that pumping light can be conveniently and uniformly dispersed into the four active fiber cores of signal light transmission by welding with the subsequent four-core active optical fibers, and signal amplification is realized; arranging the left fiber cores of four single-mode fibers into four-core passive fibers welded with the left end of the WDM coupling device, wherein the fiber cores can be matched one by one respectively, then sleeving the four passive fibers by using the left sleeve of the conical capillary, and heating and collapsing the four passive fibers to form the left end of the coupling device, so that the four passive fibers can be welded with the four passive fibers to realize the input of four-core signals; and finally, polishing the optical fiber bundle and the optical fiber bundle sleeve of the coupling device together to ensure that the end surfaces of the optical fiber bundle and the optical fiber bundle sleeve are overlapped on the same plane, the end surfaces are smooth, have no cracks, no sundries and no defects, and the end surfaces are cleaned by using dust-free paper dipped with absolute ethyl alcohol.
The invention arranges a plurality of single-mode fiber cores in the pumping fiber, and the crosstalk between the single-mode fiber cores is low, thereby inhibiting the super-mode crosstalk between the single-mode fiber cores.
The invention can amplify the signal light passing through the WDM coupling device, and improves the coupling efficiency by changing the size and the position of the fiber core of the pumping fiber.
The WDM coupling device has low preparation cost, flexible device manufacturing scheme, is not limited to single-core pumping, can be used for multi-core pumping, is not limited to four-core pumping, and can be used for any multi-core pumping, and the fiber core and the signal core are arranged in the same device, so that the distortion of signals in the tapering process is avoided.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The WDM coupling device of the annular multi-core optical fiber is characterized by comprising a left sleeve, a right sleeve, a plurality of single-mode optical fibers and a multi-mode optical fiber; the multimode fiber is used as a pumping fiber and is used for pumping light;
Removing the coating layer and the cladding layer at the right ends of the single-mode optical fiber and the pump optical fiber; a plurality of grooves are uniformly processed around the center of the pumping optical fiber core around the pumping optical fiber core, the number of the grooves is consistent with that of the single-mode optical fibers, and the diameter of each groove is matched with the diameter of the fiber core at the right end of the single-mode optical fibers;
The right-end fiber cores of the single-mode fibers are respectively inserted into the grooves of the pumping fibers one by one, the right-end fiber cores of the single-mode fibers and the fiber cores of the multi-core active fibers welded at the right end of the coupling device can be respectively matched one by one, the right sleeve is sleeved on the right-end fiber cores of the single-mode fibers and the pumping fibers, and the right-end fiber cores of the coupling device are formed by heating and collapsing, so that the pumping light can be conveniently and uniformly dispersed into the active fiber cores of signal light transmission by welding with the subsequent multi-core active fibers, and signal amplification is further realized;
Removing a coating layer and part or all of a cladding layer at the left end of the single-mode optical fiber; the left end fiber cores of the single-mode fibers are arranged to be matched with the fiber cores of the multi-core passive fibers welded with the left ends of the coupling devices one by one, the left sleeve is sleeved on the left end fiber cores of the single-mode fibers, and the left end of the coupling devices is formed by heating and collapsing, so that the multi-core passive fibers can be welded with the multi-core passive fibers conveniently to realize the input of multi-core signals;
The diameter of the fiber core of the single-mode fiber is more than 7 Less than 10/>; The interval between the fiber cores of adjacent single mode fibers is more than 20Less than 50/>; Multimode optical fiber core diameter is greater than 20/>Less than 100/>。
2. The preparation method of the WDM coupling device of the annular multi-core optical fiber is characterized by comprising the following steps:
Step 1: selecting a plurality of single-mode fibers and a multimode fiber, wherein the mode fields of the single-mode fibers are consistent, and the multimode fiber is used as a pumping fiber for pumping light; removing the coating layer and part or all of the cladding layer at the left end of the single-mode optical fiber; removing the coating layer and the cladding at the right ends of the single-mode optical fiber and the pump optical fiber;
Step 2: micro-hole processing is carried out on the fiber core at the right end of the pumping optical fiber, a plurality of grooves are uniformly processed around the center of the pumping optical fiber core around the pumping optical fiber core, the number of the grooves is consistent with that of the single-mode optical fibers, and the diameter of each groove is matched with that of the fiber core at the right end of the single-mode optical fibers;
Step 3: the right-end fiber cores of the single-mode fibers are respectively inserted into the grooves of the pumping fibers one by utilizing micro-platform operation, the right-end fiber cores of the single-mode fibers and the fiber cores of the multi-core active fibers welded at the right end of the coupling device can be respectively matched one by one, the right-end fiber cores are sleeved by the right sleeve, and the right end of the coupling device is formed by heating and collapsing, so that the pumping light can be conveniently and uniformly dispersed into the active fiber cores of the signal light transmission by welding with the subsequent multi-core active fibers, and further signal amplification is realized; the left end fiber cores of the single-mode fibers are arranged to be matched with the fiber cores of the multi-core passive fibers welded with the left ends of the coupling devices one by one, the multi-core passive fibers are sleeved by the left sleeves, and the left ends of the coupling devices are formed by heating and collapsing, so that the multi-core passive fibers are welded with the multi-core passive fibers conveniently to realize the input of multi-core signals.
3. The method of manufacturing a WDM coupling device with a ring-type multicore fiber according to claim 2, wherein in step 1, the multimode fiber is used as a pump fiber for pumping 980nm pump light.
4. The method for manufacturing a WDM coupling device for a ring-type multi-core optical fiber according to claim 2, wherein in step 1, a wire stripper is used to strip a coating layer at the left end of a single-mode optical fiber, and then a hydrofluoric acid solution with a volume fraction of 10-50% is used to corrode part or all of the cladding layer at the left end of the single-mode optical fiber; and stripping the coating layers at the right ends of the single-mode fiber and the pumping fiber by using a wire stripper, and corroding the cladding layers at the right ends of the single-mode fiber and the pumping fiber by using a hydrofluoric acid solution with the volume fraction of 10-50%.
5. The method for manufacturing a WDM coupling device with annular multicore fibers according to claim 2, wherein after step 1, the treated fibers are ultrasonically cleaned with absolute ethanol for 5 to 10 minutes, and then the fiber end faces are cleaned with dust-free dip-in absolute ethanol.
6. The method for manufacturing a WDM coupling device for a ring-type multi-core optical fiber of claim 2, wherein in step 2, the right-end core of the pump optical fiber is micro-porous with a femtosecond laser, and a plurality of grooves are uniformly formed around the center of the pump optical fiber core around the pump optical fiber core with a strong laser, the grooves having a diameter of 50 to 70。
7. The method of manufacturing a WDM coupling device with annular multicore fibers according to claim 2, wherein in step 3, after the right cores of the single-mode fibers are inserted into the grooves of the pump fibers, the gaps between the right cores of the single-mode fibers and the grooves are filled with low refractive index glue, and the low refractive index glue is cured sufficiently by irradiation for 10-20 minutes in the uv light environment.
8. The method of manufacturing a WDM coupling device with annular multicore fibers of claim 2, wherein in step 3, the left and right ferrules are tapered capillaries.
9. The method of manufacturing a WDM coupler for a ring-type multicore fiber according to claim 2, wherein after step 3, the fiber bundle and the fiber bundle ferrule of the coupler are polished together so that the end faces thereof coincide with the same plane, and the end faces are flat, crack-free, impurity-free, and flaw-free, and the end faces are cleaned with a dust-free paper dipped in absolute ethyl alcohol.
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