CN210376754U - Structure for preventing optical fiber welding spot from overheating - Google Patents
Structure for preventing optical fiber welding spot from overheating Download PDFInfo
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- CN210376754U CN210376754U CN201921754017.0U CN201921754017U CN210376754U CN 210376754 U CN210376754 U CN 210376754U CN 201921754017 U CN201921754017 U CN 201921754017U CN 210376754 U CN210376754 U CN 210376754U
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Abstract
The structure for preventing the optical fiber welding spot from overheating comprises the optical fiber welding spot and a bare fiber, wherein coating layers are stripped on two sides or one side of the bare fiber, the cladding of the bare fiber is provided with at least one layer, and the surface of each layer is provided with a textured structure. The utility model discloses a handle cladding structure around the optic fibre solder joint and make cladding stray light leak out fiber waveguide, effectively weakened the optic fibre that arouses because of factors such as coupling loss and generated heat, solved the overheated problem of solder joint. The utility model has the characteristics of simple structure, the integration of being convenient for can bear threshold value power height.
Description
Technical Field
The utility model relates to a fiber laser or fiber amplifier field specifically indicate a prevent overheated structure of optic fibre solder joint.
Background
The high-power laser has the characteristics of high energy, good beam quality, high conversion efficiency, low thermal effect and the like, and is widely applied to the fields of laser processing, medical care, military weapons, precision measurement and the like. With the rapid development of various application fields, new challenges are also provided for laser technology.
In the process of rapid development of high-power fiber lasers, the improvement of the light guide power of a single optical fiber also puts higher requirements on the fusion welding process among the optical fibers. In the process of welding optical fibers, the change of boundary conditions at the notch of the coating layer causes light waves to leak in a small area, and the heat effect caused by loss is increased along with the continuous increase of laser power. This loss becomes a factor in the problem of heating of the solder joints of high power fiber lasers. The optical fiber coating layer is generally composed of organic polymers such as acrylate or fluorine-doped acrylate, and is the lowest melting point part of the whole optical fiber. The coating may burn out when the temperature exceeds 130 c. In order to ensure that the optical fiber laser can work stably for a long time, the temperature of a coating layer is usually less than 80 ℃, especially the coating layer near a welding point, and light waves leak out of a cladding layer due to sudden change of a waveguide structure, so that local high temperature is easily caused and the coating layer is burnt. The optical fiber welding spot is commonly existed in the optical fiber laser and key devices, so the process for preventing the welding spot from overheating has important application value in the field of high-power lasers, and is one of the restriction factors for realizing higher-power laser output.
The following structures and methods are commonly used to prevent solder joints from overheating:
coating welding spots and cooling with water: the method can be used for welding spots of active and passive optical fibers and welding spots for transmitting signal light in a fiber core.
Suspension of welding spots: when the pumping light was transmitted at the covering, the optical fiber solder joint should not coat, changes the pumping light of constraint covering behind the coating for the solder joint is changeed and is generated heat, consequently, clean and unsettled with the solder joint, can effectively reduce the heat effect problem that the solder joint generated heat and brought.
The method has high requirement on environment cleanliness and is suitable for treating slightly-heated welding spots. For the welding spot with higher temperature, the treatment effect of the method is not ideal.
CN106094111A discloses a method for processing a fusion spliced optical fiber, which comprises: coating first coating glue with refractive index larger than that of cladding layers of the first optical fiber and the second optical fiber on the surface of the first original optical fiber section and the surface of the second original optical fiber section respectively; and coating a second coating adhesive with the refractive index smaller than the refractive index of the cladding of the first optical fiber and the second optical fiber on the surfaces of the first bare fiber section, the fusion point and the second bare fiber section. According to the method, the refractive index glue is coated on the cladding of the optical fiber, so that cladding light at the welding point is guided out of the optical fiber waveguide, the thermal deposition effect at the welding point is reduced, and the power load capacity of the welding point is improved. However, in the optical fiber fusion point processed by the method, since the cladding light at the fusion point leaks to the coating glue, the temperature of the coating glue is too high, and the coating glue wraps the optical fiber, so that the problem that the welding point is overheated under high power still cannot be avoided.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough and defect of prior art, provide a prevent the overheated structure of optic fibre solder joint, can effectively solve the overheated problem of solder joint.
The utility model provides an optic fibre solder joint structure is used for weakening because waveguide structure sudden change leads to the mode field to mismatch the heat effect that arouses the loss to produce, prevents that solder joint optic fibre from being overheated. The bare fiber cladding with the coating layer stripped from two sides or one side of the optical fiber welding spot is subjected to layered texturing treatment, so that stray light of the cladding layer is leaked out of the optical fiber waveguide, and the optical fiber heating caused by coupling loss and other factors is weakened. The cladding of the bare fiber on two sides or one side of the optical fiber welding spot is provided with at least one layer, and the surface of each layer is provided with a textured structure. If the cladding of the bare fiber has a plurality of layers, the plurality of layers are distributed in a stepped manner as a whole. And selecting proper layering depth and length according to different types of optical fiber welding spots. When the cladding is processed properly, all stray light of the cladding leaks out of the optical fiber waveguide, and the problem of heating of welding spots is greatly improved, so that the emergence of a higher-power laser is promoted.
The layering depth of the bare fiber cladding is related to the selected processing method and processing time. According to different types of input and output optical fibers of welding spots, methods such as chemical corrosion, physical texturing and the like can be selected to destroy bare fiber cladding, so that cladding light leaks out of the optical fiber waveguide, and the problem of optical fiber heating caused by coupling loss and other factors is solved. The depth and length of each layer of the bare fiber cladding determine the light transmission performance and the bearing power of the welding spot. If the layering depth of the bare fiber cladding is too deep, effective transmission light can leak out of the optical fiber, so that the transmittance of a welding spot is influenced, and the light transmission performance is reduced. If the depth of each layer of the bare fiber cladding is too shallow, invalid light (transmission light with low coupling efficiency due to mode field mismatch) may not leak out of the optical fiber, so that a nearby coating layer generates heat, and the coating layer is more easily burned out with the increase of power, thereby hindering the development of a high-power laser.
In addition, the length of each layer of the bare fiber cladding affects the amount of light leakage. When the depth of each layer of the bare fiber cladding is proper, the length of each layer of the bare fiber cladding determines the optical and mechanical properties of the welding spot.
Temperature Q of each layered optical fiber welding spot outgoing end of bare fiber claddingoutAnd filtering out the power PdumpThe following relation is satisfied:
Qout＝a/Pdump(1)
where a represents the filtering out coefficient.
Hairing length L and filtering power P of each layer of bare fiber claddingdumpThe following relation is satisfied:
Pdump＝Pc*e-aL(2)
wherein P iscRepresenting the total power transmitted in the cladding and a the filtering out coefficient.
From the two formulas (1) and (2), on one hand, the longer the length of each layer of the bare fiber cladding, the more the ineffective light leakage, and the less the solder joint is heated, so that the solder joint can bear the light transmission with higher power. On the other hand, the lengths of all the layers of the bare fiber cladding are too long, welding spots are easy to break, and the mechanical performance cannot be effectively guaranteed. Therefore, the depth and length of the delamination should be selected appropriately for different fiber solder joints.
In structural design, if a non-layered bare fiber cladding structure is adopted around an optical fiber welding spot, in order to leak more cladding light, the depth of the bare fiber cladding is designed to be large, so that the optical fiber is easy to break, and the reliability of the structure is greatly reduced. The utility model discloses a naked fine covering of layering for the invalid light of covering leaks out fiber waveguide and does not influence the transmission of effective light in the waveguide. The layered structure can filter cladding light to the maximum extent, and can retain the toughness of the optical fiber, thereby ensuring the reliability of the structure. The structure of the utility model is suitable for single cladding and double cladding optical fiber solder joint of all wavelengths.
Prevent overheated structure of optic fibre solder joint includes: the optical fiber welding spot comprises an optical fiber welding spot and bare fibers with coating layers stripped on two sides or one side of the optical fiber welding spot, wherein the cladding of the bare fibers is provided with at least one layer, and the surface of each layer is provided with a textured structure.
Preferably, the cladding of the bare fiber has a plurality of layers, and the plurality of layers are distributed in a stepped manner as a whole.
Preferably, the depth of each segment is 5-95% of the outermost cladding radius of the optical fiber.
Further, the depth of each layer accounts for 10% -80% of the radius of the outermost cladding layer of the optical fiber.
Further, the depth of each layer accounts for 10% -70% of the radius of the outermost cladding layer of the optical fiber.
Further, the depth of each layer accounts for 10% -35% of the radius of the outermost cladding layer of the optical fiber.
Preferably, the depth of each layer on any side of the optical fiber welding spot is reduced from the welding spot to the direction far away from the welding spot.
Preferably, the depth of the same corresponding layer of each layer at two sides of the optical fiber welding spot accounts for the same percentage of the radius of the outermost cladding of the optical fiber at the corresponding side.
Preferably, the length L and filtering power P of each layer aredumpThe following relation is satisfied:
Pdump＝Pc*e-aL
wherein P iscRepresenting the total power transmitted in the cladding and a the filtering out coefficient.
Preferably, the lengths of the same corresponding layers on both sides of the optical fiber welding spot are equal.
Preferably, the shape of the notch of the textured structure on the surface of each layered layer is any one or any combination of a sharp corner, a square or a parabola.
Preferably, the structure for preventing the optical fiber solder joint from being overheated further comprises a black box for packaging.
The utility model discloses a prevent overheated structure manufacturing method of optic fibre solder joint, including following step:
1) stripping the optical fiber coating layer near the welding spot, and cleaning the bare fiber;
2) carrying out layered texturing treatment on the bare fiber cladding;
3) and cleaning the processed welding spot and the surrounding bare fiber cladding.
Preferably, the layered texturing treatment mode is a plurality of layered texturing, and the plurality of layers are integrally distributed in a stepped manner.
Preferably, the layered texturing treatment mode is single-layer texturing.
Preferably, the substance for washing is alcohol.
Preferably, the layered texturing processing method is any one of chemical etching, physical texturing or laser etching.
The welding spot types suitable for the structure of the utility model include but are not limited to tapered fiber welding spots, reducing fusion welding spots, reducing core welding spots (the same diameter different NA welding spots are similar to the welding spots), and the like.
The utility model discloses the beneficial technological effect of structure as follows:
(1) the structure is simple, the heating of the welding spot is obviously reduced after the structure of the utility model is adopted, and the requirement degree on the use environment is not high after the packaging;
(2) the fiber laser is convenient to integrate in a fiber laser or a laser amplifier, and the volume is small;
(3) the method has the characteristics of low loss and high bearable threshold power.
Drawings
FIG. 1 is a schematic structural diagram of a tapered optical fiber solder joint for preventing overheating.
In the figure: 1 is two optical fiber welding spots; 21 is the fiber core at the left side of the welding spot; 22 is the left fiber cladding of the welding spot; 23 is a welding spot left side optical fiber coating layer; 31 is the fiber core at the right side of the welding spot; 32 is the fiber cladding on the right side of the welding spot; 33 is a fiber coating layer on the right side of the welding spot; 411 is layer 1, d of the bare fiber cladding on the left side of the solder joint1To its depth, L1Is its length; 421 is a lamination layer 1 ', d ' of bare fiber cladding on the right side of the welding point '1Is the depth, L'1Is its length; 412 is layer 2, d of the bare fiber cladding on the left side of the solder joint2To its depth, L2Is its length; 422 is a lamination 2 ', d ' of bare fiber cladding on the right side of the welding spot '2Is the depth, L'2Is its length; 413 delamination 3, d of the left bare fiber cladding of the solder joint3To its depth, L3Is its length; 423 is a layer 3 'of bare fiber cladding to the right of the solder joint, where d'3Is the depth, L'3Is its length; and 5, a packaging box body.
Fig. 2 is a schematic structural diagram of preventing overheating of the welding spot of the NA welding with different diameters.
In the figure: 1 is two optical fiber welding spots; 21 is the fiber core at the left side of the welding spot; 22 is the left fiber cladding of the welding spot; 23 is a welding spot left side optical fiber coating layer; 31 is the fiber core at the right side of the welding spot; 32 is the inner cladding of the optical fiber at the right side of the welding spot; 33 is the right side optical fiber outer cladding of the welding spot; 34 is a fiber coating layer on the right side of the welding spot; 411 is layer 1, d of the bare fiber cladding on the left side of the solder joint1To its depth, L1Is its length; 421 is a lamination layer 1 ', d ' of bare fiber cladding on the right side of the welding point '1Is the depth, L'1Is its length; 412 is the delamination of the left bare fiber cladding of the solder joint2，d2To its depth, L2Is its length; 422 is a lamination 2 ', d ' of bare fiber cladding on the right side of the welding spot '2Is the depth, L'2Is its length; and 5, a packaging box body.
Fig. 3 is a schematic structural diagram for preventing overheating of the welding spot of the different-core diameter welding.
In the figure: 1 is two optical fiber welding spots; 21 is the fiber core at the left side of the welding spot; 22 is the left fiber cladding of the welding spot; 23 is a welding spot left side optical fiber coating layer; 31 is the fiber core at the right side of the welding spot; 32 is the fiber cladding on the right side of the welding spot; 33 is a fiber coating layer on the right side of the welding spot; 4 is the layer 1, d of the bare fiber cladding on the left side of the welding spot1To its depth, L1Is its length; and 5, a packaging box body.
Fig. 1-3 are schematic structural diagrams of the structure of the present invention cut along the plane (i.e. the meridian plane) of the central axis of the optical fiber.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the scope of the present invention should not be limited thereto.
The utility model provides a prevent overheated structure of optic fibre solder joint specifically includes that optic fibre solder joint and both sides or one side have peeled the naked fine of coating, naked fine covering has at least one layering, and the surface of each layering has the texturing structure.
The utility model discloses a naked fine covering can have a plurality of layering, and each layering is cascaded distribution because of the different covering degree of depth that the texturing process was got rid of. Taking FIG. 1 as an example, 411 is a layer 1 of bare fiber cladding on the left side of the solder joint, which is removed by texturing to a depth d1I.e., the depth of the surface 411 from the surface of the untreated cladding, is also the depth of layer 1. 421 is the layer 1' of the bare fiber cladding on the right side of the welding spot, which is the first segment layer with the corresponding side nearest to the welding spot with the layer 1 of the bare fiber cladding on the left side of the welding spot, and the two layers are the same corresponding layer. The depth of the cladding layer removed by the texturing treatment is d'1I.e., the depth of the surface on which 421 is located from the surface of the untreated cladding, is also the depth of the delamination 1'. Layer 412 is layer 2 of bare fiber cladding on the left side of the solder joint, which has been removed to a depth of cladding by texturingDegree d2I.e., the depth of the plane 412 from the surface of the untreated cladding, is also the depth of layer 2. 422 is the layering 2' of the bare fiber cladding on the right side of the welding spot, and the layering 2 of the bare fiber cladding on the left side of the welding spot are both second-stage layering with the corresponding side closer to the welding spot, and the two are the same corresponding layer. 422 the depth of the cladding removed by texturing is d'2I.e., the depth of the plane 422 from the surface of the untreated cladding, is also the depth of the delamination 2'. 413, layer 3 of the bare fiber cladding on the left side of the solder joint, which is removed by texturing to a depth d3I.e. the depth of the face 413 from the surface of the untreated cladding, is also the depth of the delamination 3. 423 is a layer 3' of the bare fiber cladding on the right side of the welding spot, which is the third layer with the corresponding side farthest from the welding spot with the layer 3 of the bare fiber cladding on the left side of the welding spot, and the two layers are the same corresponding layer. 423 d 'as the depth of the cladding removed by texturing'3I.e. the depth of the surface 423 from the surface of the untreated envelope, is also the depth of the delamination 2'. In the above description, d1>d2>d3，d′1>d′2>d′3That is, the whole of a plurality of layers is in step-shaped distribution, and the depth of each layer is reduced from the welding point to the direction far away from the welding point.
The depth of each layer of the bare fiber cladding of the utility model accounts for 5% -95% of the radius of the outermost cladding of the optical fiber. The depth of the same corresponding layer of each layer at two sides of the optical fiber welding spot can be equal to the percentage of the radius of the outermost cladding of the optical fiber at the corresponding side. Taking FIG. 1 as an example, d1D 'as a percentage of the radius of the outermost cladding of the left-side fiber'1The percentage of the outermost cladding radius of the right fiber is equal; d2D 'as a percentage of the radius of the outermost cladding of the left-side fiber'2The percentage of the outermost cladding radius of the right fiber is equal; d3D 'as a percentage of the radius of the outermost cladding of the left-side fiber'3The percentage of the outermost cladding radius of the right fiber is equal.
The utility model discloses the same length that corresponds the layer in the optic fibre solder joint both sides of structure can be equal. Length L and filtering power P of each layerdumpThe following relation is satisfied:
Pdump＝Pc*e-aL
wherein P iscRepresenting the total power transmitted in the cladding and a the filtering out coefficient.
Taking FIG. 1 as an example, the length of the layer 1 of the bare fiber cladding on the left side of the solder joint is L1L ' is the length of the layer 1 ' of the bare fiber cladding on the right side of the solder joint '1. The length of the layer 2 of the bare fiber cladding on the left side of the welding spot is L2L ' length of layer 2 ' of bare fiber cladding on the right side of solder joint '2. The length of the layer 3 of the bare fiber cladding on the left side of the welding spot is L3The length of the layer 3 'of the bare fiber cladding on the right side of the solder joint is L'3. Wherein L is1＝L′1，L2＝L′2，L3＝L′3。
The cladding of the bare fiber of the present invention may also have a layer. Taking FIG. 3 as an example, 4 is the layer 1 of bare fiber cladding on the left side of the solder joint, and the depth of the cladding removed by texturing is d1The structure has only one layer of textured structure.
The gap shape of the texturing structure on the surface of each layer of the utility model can be any one or any combination of sharp angle, square or parabola shape, and also can be other irregular shapes.
The structure manufacturing method of the utility model comprises the following steps:
1) stripping the optical fiber coating layer near the welding spot, and cleaning the bare fiber;
2) carrying out layered texturing treatment on the bare fiber cladding;
3) and cleaning the processed welding spot and the surrounding bare fiber cladding.
In step 1), the utility model discloses the mode that the structure stripped the coating is for stripping along the whole circle of optic fibre column surface.
In the step 2), the bare fiber layered texturing treatment mode can be multi-layered texturing or single-layer texturing. If the texture is formed by a plurality of layers, the plurality of layers are integrally distributed in a step shape. The texturing operation of each layer is carried out along the whole circle of the cylindrical surface of the bare fiber cladding. The stepped layering and texturing treatment method of the bare fiber cladding includes but is not limited to chemical corrosion, physical texturing, laser etching and the like.
Be suitable for the utility model discloses the solder joint kind of structure includes but not limited to the biconical taper optic fibre solder joint, reducing fusion splice solder joint, reducing core footpath solder joint (with the different NA solder joint of footpath and this type solder joint similarity) etc..
Example 1: tapered optical fiber welding spot
As shown in fig. 1:
diameter of fiber core/cladding on left side of welding spot: 30/250 μm, NA: 0.06/0.46.
Diameter of fiber core/cladding on right side of welding spot: 50/400 μm before tapering, NA: 0.12/0.46; the cladding after tapering is about 300 μm.
And ultrasonically cleaning the optical fiber welding spot 1, introducing 200W pulse laser, and testing the temperature of the outlet end of the welding spot to be 68.7 ℃. And (3) peeling off a circle of optical fiber coating layers 23 and 33 with the length of 5cm on the left and the right of the welding point 1, wiping the left bare fiber cladding layer 22 and the right bare fiber cladding layer 32 by alcohol, and placing the left bare fiber cladding layer and the right bare fiber cladding layer in the corrosion strip. Uniformly coating corrosion paste/liquid on the whole circle of the cladding position corresponding to the layering 1(411) of the bare fiber cladding on the left side of the welding spot for texturing treatment; similarly, uniformly coating the corrosion paste/liquid on the whole circle of the cladding position corresponding to the layering 1' (421) of the bare fiber cladding on the right side of the welding spot for texturing; and standing for 60 minutes, and then washing away the corrosion paste/liquid by using clear water. Uniformly coating corrosion paste/liquid on the whole circle of the cladding position corresponding to the layering 2(412) of the bare fiber cladding on the left side of the welding spot for texturing treatment; similarly, uniformly coating the corrosion paste/liquid on the whole circle of the cladding position corresponding to the layering 2' (422) of the bare fiber cladding on the right side of the welding spot for texturing; and (4) standing for 30 minutes, and then washing away the corrosion paste/liquid by using clear water. Uniformly coating corrosion paste/liquid on the cladding position corresponding to the layering 3(413) of the bare fiber cladding on the left side of the welding spot for texturing; similarly, uniformly coating the corrosion paste/liquid on the whole circle of the cladding position corresponding to the layering 3' (423) of the bare fiber cladding on the right side of the welding spot for texturing; and (4) standing for 10 minutes, and then washing away the corrosion paste/liquid by using clear water. And finally, cleaning the welding spot and the bare fiber cladding layers on the two sides of the welding spot by using alcohol. The 3 groups of the textured layers are integrally distributed in a step shape. Depth d of layer 1 of bare fiber cladding on left side of welding spot130% of the left bare fiber cladding radius (125 μm); likewise, the bare fiber cladding on the right side of the solder jointDepth d 'of layer No. 1'1Accounting for 30 percent of the radius (200 mu m) of the cladding of the bare fiber before right-side tapering. Depth d of layer 2 of bare fiber cladding on left side of welding spot220% of the left bare fiber cladding radius (125 μm); likewise, depth d ' of segment 2 ' of bare fiber cladding to the right of the solder joint '2Accounting for 20 percent of the radius (200 mu m) of the cladding of the bare fiber before right-side tapering. Depth d of layer 3 of bare fiber cladding on left side of solder joint310% of the radius (125 μm) of the left bare fiber cladding; likewise, depth d ' of delamination 3 ' of the bare fiber cladding to the right of the solder joint '3Accounting for 10 percent of the radius (200 mu m) of the cladding of the bare fiber before right-side tapering. Length L of layer 1 of bare fiber cladding on left side of welding spot1Is 5 mm; likewise, length L ' of segment 1 ' of bare fiber cladding on the right side of the solder joint '1Is 5 mm. Length L of layer 2 of bare fiber cladding on left side of welding spot2Is 10 mm; likewise, length L ' of segment 2 ' of bare fiber cladding on the right side of the solder joint '2Is 10 mm. Length L of layer 3 of bare fiber cladding on left side of welding spot3Is 25 mm; likewise, the length L ' of segment 3 ' of the bare fiber cladding on the right side of the solder joint '3Is 25 mm. The shape of the textured structure notch on the surface of each layered layer of the bare fiber cladding is an acute-angled irregular structure. In the figure, 21 is the fiber core on the left side of the solder joint, and 31 is the fiber core on the right side of the solder joint. And (3) testing the temperature of the welding spot after cladding treatment, and passing 200W pulse laser to test that the temperature of the welding spot outlet end is 34 ℃. Therefore, the structure can obviously improve the heating problem of the welding spots. The treated welding spots are packaged by a black box body 5, so that the influence of the leaked light on the surrounding environment is avoided.
Example 2: different diameter and different NA welding spot
As shown in fig. 2:
diameter of fiber core/cladding on left side of welding spot: 50/400 μm, NA: 0.12/0.46.
Diameter of fiber core/inner cladding/outer cladding on right side of welding spot: 100/120/360 μm, NA: 0.22.
and (3) supplying 150W pulse laser to the welding spot, and testing the temperature of the outlet end of the welding spot to be 61 ℃. A4 cm long circle of optical fiber coating layers 23 and 34 on the left and right sides of the welding point 1 are stripped, and the left bare fiber cladding layer 22 and the right bare fiber cladding layer 33 are wiped clean by alcohol. Using a cutting knife to coat the bare fiber at the left side of the welding spot22, a circle of cladding corresponding to the layer 1(411) is subjected to physical texturing treatment; similarly, a cutting blade is used to physically roughen a ring of cladding corresponding to layer 1' (421) of the bare fiber cladding 33 on the right side of the bond. Depth d of layer 1 of bare fiber cladding on left side of welding spot125% of the left bare fiber cladding radius (200 μm); likewise, the depth d ' of the layer 1 ' of the bare fiber outer cladding on the right side of the solder joint '1Accounting for 25% of the right bare fiber outer cladding radius (180 μm). Using a cutting knife to perform surface roughening treatment on the circle of cladding 22 of the layering 2(412) of the bare fiber cladding on the left side of the welding spot; similarly, a cutting blade is used to surface roughen the one turn outer cladding 33 of the delamination 2' (422) of the bare fiber cladding on the left side of the weld. Depth d of layer 2 of bare fiber cladding on left side of welding spot215% of the radius (200 μm) of the left bare fiber cladding; likewise, the depth d ' of the layer 2 ' of the bare fiber outer cladding on the right side of the solder joint '215% of the right bare fiber outer cladding radius (180 μm). Length L of layer 1 of bare fiber cladding on left side of welding spot1Is 10 mm; likewise, the length L ' of the segment 1 ' of the bare fiber outer cladding on the right side of the solder joint '1Is 10 mm. Length L of layer 2 of bare fiber cladding on left side of welding spot2Is 20 mm; likewise, the length L ' of the segment 2 ' of the bare fiber outer cladding on the right side of the solder joint '2Is 20 mm. And finally, cleaning the welding spot and the two side claddings by using alcohol. The two groups of the textured layering are integrally distributed in a step shape. The shape of the textured structure notch on the surface of each layered layer of the bare fiber cladding is a square structure. In the figure, 21 is the fiber core at the left side of the welding point, 31 is the fiber core at the right side of the welding point, and 32 is the inner cladding of the fiber at the right side of the welding point. And (3) testing the temperature of the welding spot after cladding treatment, and passing 150W pulse laser to test that the temperature of the welding spot outlet end is 32 ℃. Therefore, the structure can obviously improve the heating problem of the welding spots. The treated welding spots are packaged by a black box body 5, so that the influence of the leaked light on the surrounding environment is avoided.
Example 3: different core diameter welding spot
As shown in fig. 3:
diameter of fiber core/cladding on left side of welding spot: 25/250 μm, NA: 0.46.
diameter of fiber core/cladding on right side of welding spot: 30/250 μm, NA: 0.46.
and (3) introducing 500W pulse laser to the welding spot, and testing the temperature of the outlet end of the welding spot to be 55 ℃. Stripping a circle of optical fiber coating layer 23 with the length of 1cm at the left end of a welding spot 1, wiping the left bare fiber cladding layer 22 clean by alcohol, etching the circle of cladding layer 22 corresponding to the layering 1(4) of the left bare fiber cladding layer of the welding spot by using laser, and processing the depth d of the layering 1 of the left bare fiber cladding layer of the welding spot1Accounting for 60% of the left fiber cladding radius (125 μm). This example did not have any texturing of the fiber to the right of the solder joint. Here, the length L of segment 1 of the bare fiber cladding on the left side of the solder joint1Is 8 mm. The shape of the gap of the textured structure on the surface of the split layer of the bare fiber cladding on the left side of the welding spot is a parabolic regular structure. And finally, cleaning the welding spot and the cladding optical fibers on two sides by using alcohol. In the figure, 21 is a fiber core on the left side of the welding point, 31 is a fiber core on the right side of the welding point, 32 is a fiber cladding on the right side of the welding point, and 33 is a fiber coating on the right side of the welding point. And (3) testing the temperature of the welding spot after cladding treatment, and similarly, applying 500W pulse laser to test that the temperature of the outlet end of the welding spot is 27 ℃. Therefore, the structure can obviously improve the heating problem of the welding spots. The treated welding spots are packaged by a black box body 5, so that the influence of the leaked light on the surrounding environment is avoided. The structure of the overheated welding spot with the same diameter and different NA is similar to the structure of FIG. 3, and the optical fiber cladding at one end with the small core diameter (small NA) is processed asymmetrically, so that the light transmitted from one end with the large core diameter (large NA) leaks out from the bare fiber cladding with the small core diameter (small NA), and the optical fiber is prevented from heating. It is noted here that the number of layers of the bare fiber cladding layer of 1 can also solve the problem of solder overheating for solder joints with insignificant heat generation.
It should be noted that the terms "left" and "right" herein merely represent directions, and are only used as examples and do not limit the present invention. The length, time and depth of the layering treatment of the bare fiber cladding are not limited by the above conditions.
Claims (8)
1. A structure for preventing overheating of a solder joint of an optical fiber, comprising: the optical fiber welding spot comprises an optical fiber welding spot and a bare fiber with coating layers stripped on two sides or one side of the optical fiber welding spot, and is characterized in that a cladding of the bare fiber is provided with at least one layer, and the surface of each layer is provided with a textured structure.
2. The structure for preventing the overheating of the welding point of the optical fiber according to claim 1, wherein the cladding of the bare fiber has a plurality of layers, and the plurality of layers are distributed in a stepwise manner as a whole.
3. The structure for preventing overheating of a solder joint of an optical fiber according to claim 1, wherein the depth of each segment is 5% to 95% of the radius of the outermost cladding layer of the optical fiber.
4. The structure for preventing overheating of an optical fiber solder joint according to claim 1, wherein the depth of each of the layers on either side of the optical fiber solder joint decreases in the order from the solder joint to a direction away from the solder joint.
5. The structure for preventing the overheating of the optical fiber welding spot according to claim 1, wherein the depth of the same corresponding layer in each of the two side layers of the optical fiber welding spot is equal to the percentage of the radius of the outermost cladding layer of the optical fiber at the corresponding side.
6. The structure for preventing optical fiber solder joint from overheating according to claim 1, wherein the length L and the filtering power P of each layer aredumpThe following relation is satisfied:
Pdump＝Pc*e-aL
wherein P iscRepresenting the total power transmitted in the cladding and a the filtering out coefficient.
7. The structure for preventing overheating of an optical fiber solder joint according to claim 1, wherein the lengths of the same corresponding layers on both sides of the optical fiber solder joint are equal.
8. The structure for preventing the overheating of the welding point of the optical fiber according to claim 1, wherein the shape of the notch of the texturing on the surface of each layered surface is any one or any combination of a sharp corner, a square or a parabola.
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| CN110596812A (en) * | 2019-10-18 | 2019-12-20 | 上海飞博激光科技有限公司 | Structure for preventing optical fiber welding spot from overheating and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110596812A (en) * | 2019-10-18 | 2019-12-20 | 上海飞博激光科技有限公司 | Structure for preventing optical fiber welding spot from overheating and manufacturing method thereof |
| CN110596812B (en) * | 2019-10-18 | 2024-03-12 | 上海飞博激光科技股份有限公司 | Structure for preventing overheating of optical fiber welding spots and manufacturing method thereof |
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