CN115903139B - End face positioning method and device of polarization maintaining fiber fusion splicer - Google Patents
End face positioning method and device of polarization maintaining fiber fusion splicer Download PDFInfo
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Abstract
The application relates to an end face positioning method and an end face positioning device of a polarization maintaining optical fiber fusion splicer, and relates to the technical field of fusion splicers. Comprises the following steps: setting a grid datum line on a display screen for displaying the end face of the optical fiber, wherein the grid datum line comprises a group of vertical datum lines which are vertical, two groups of diagonal datum lines which are mutually vertical and are 45 degrees with the vertical datum lines; step 2: performing angular positioning on the optical fibers to be welded, determining the position of the end face of the optical fibers to be welded by utilizing a grid datum line, and determining whether the central connecting line of two stress areas is parallel to the diagonal datum line according to the tangential quantity or the tangential quantity of the edge of the stress area and the diagonal datum line; step 3: the direction of the optical path of the image pickup device for photographing the optical fibers in the fusion unit is set to be perpendicular to the diagonal reference line, and the fusion quality is judged by observing the image of the optical fibers in the fusion process. The application has the advantages of clear display of the fusion image of the optical fiber, prevention of misjudgment of failure and improvement of production efficiency.
Description
Technical Field
The application relates to the technical field of fusion splicers, in particular to an end face positioning method and an optical fiber end face positioning device of a polarization maintaining optical fiber fusion splicer.
Background
The polarization maintaining optical fiber is used as a special optical fiber, can transmit linearly polarized light and ensures that the linear polarization direction is unchanged. In contrast to conventional fiber structures, the cladding of a polarization maintaining fiber includes, in addition to a core, a stress region symmetrical about the core, and the relative position of the stress region needs to be adjusted in addition to the alignment of the cores during fusion.
An existing polarization maintaining optical fiber fusion splicer refers to an optical fiber fusion splicer and an optical fiber fusion splicing method disclosed in patent publication No. CN106908902A, and comprises optical fiber cutting, wherein after two optical fibers to be fused are respectively fixed through two rotatable optical fiber clamps, the two rotatable optical fiber clamps are sequentially installed together with an optical fiber cutting knife, and the optical fiber cutting knife sequentially cuts the two optical fibers to be fused to form two optical fiber end faces for fusion splicing; angular positioning: the method comprises the steps that a rotatable optical fiber clamp is arranged on an optical fiber end face positioning unit, the optical fiber end face of an optical fiber to be welded is observed through the optical fiber end face positioning unit, meanwhile, axial rotation adjustment is carried out on the optical fiber to be welded through an angular positioning rotating component of the rotatable optical fiber clamp, the structure and the azimuth of the optical fiber end face displayed on a display screen in the adjustment process are observed, and when the required azimuth is reached, locking is carried out, so that angular positioning is completed; fusion welding of optical fibers: two rotatable optical fiber clamps are arranged on an optical fiber welding unit, and the optical fiber end faces of two optical fibers to be welded, which are positioned in an angle direction, are welded together by the optical fiber welding unit.
In the axial rotation adjustment process of the optical fibers to be welded by using the angular positioning rotating component of the rotatable optical fiber clamp, the end faces of the optical fibers are amplified by a microscope and displayed by a display screen, a worker uses grid lines on the display screen to reference, observe and adjust the positions of the end faces of the optical fibers, then the optical fibers subjected to angular positioning are welded by an optical fiber welding unit, meanwhile, a CCD or CMOS camera device in the optical fiber welding unit displays optical fiber images and optical fiber welding results in real time, and the worker judges the welding quality of the optical fiber welding results by a display screen. In the conventional end face positioning process, referring to fig. 8 and 9, the center connecting line of two stress areas of the end face of the optical fiber is generally kept vertical to perform final angular positioning, and the CCD or CMOS in the optical fiber welding unit is located below the left and right sides of the optical fiber to perform photographing obliquely upwards, referring to fig. 10B, at this time, the image before optical fiber welding and the image after optical fiber welding observed on the display screen are blurred or asymmetric, and the image after optical fiber welding shows defects, with break points or discontinuous points, so that erroneous judgment is easily generated, and the production efficiency is affected.
Disclosure of Invention
In order to at least partially solve the technical problems, the application provides an end face positioning method of a polarization maintaining optical fiber fusion splicer and an optical fiber end face positioning device.
In order to improve the definition of an optical fiber fusion image, reduce the misjudgment rate and improve the production efficiency, the end face positioning method of the polarization maintaining optical fiber fusion splicer provided by the application adopts the following technical scheme:
an end face positioning method of a polarization maintaining fiber fusion splicer comprises the following steps:
step 1: setting a grid datum line on a display screen for displaying the end face of the optical fiber, wherein the grid datum line comprises a group of vertical datum lines which are vertical, two groups of diagonal datum lines which are mutually vertical and are 45 degrees with the vertical datum lines;
step 2: performing angular positioning on the optical fibers to be welded, determining the positions of the end faces of the optical fibers to be welded by utilizing the grid datum lines, and finally enabling the central connecting lines of two stress areas of at least one optical fiber to be welded to be parallel to one group of diagonal datum lines;
step 3: the direction of the optical path of an image pickup device for photographing the optical fibers in the fusion unit is set to be perpendicular to one of the diagonal reference lines, and the fusion quality is judged by observing the images of the optical fibers in the fusion process.
Optionally, in the step 2, it is determined whether the two stress area center connecting lines are parallel to the diagonal reference line (332) by referring to the tangency or the tangency quantity of the stress area edges and the diagonal reference line (332).
Optionally, in the step 2, a central connecting line of two stress areas of the two optical fibers to be welded is set to be respectively parallel to two sets of diagonal reference lines.
Optionally, in the step 2, the central connecting lines of the two stress areas of the two optical fibers to be fused are set to be parallel to the same set of diagonal reference lines.
Optionally, in the step 2, a central line of two stress areas of one optical fiber to be welded is set to be parallel to any one set of diagonal reference lines, and a central line of two stress areas of the other optical fiber to be welded is set to be parallel to a vertical reference line.
Optionally, two image capturing devices in the step 3 are provided, and the light path directions of the two image capturing devices are perpendicular to each other and are perpendicular to a set of diagonal reference lines respectively.
In a second aspect, the present application provides an optical fiber end surface positioning device of a polarization maintaining fiber fusion splicer, which adopts the following technical scheme:
the utility model provides a polarization maintaining optical fiber fusion splicer's optic fibre terminal surface positioner, includes microscope, display screen, net datum line, the microscope electricity is connected in the display screen and is shown the image of optic fibre terminal surface in the display screen, net datum line sets up in the display screen, net datum line includes that a set of is vertical perpendicular datum line, two sets of mutually perpendicular and all is 45 with perpendicular datum line diagonal datum line.
In summary, the present application includes at least one of the following beneficial technical effects: the central connecting line of the two stress areas on the end face of the optical fiber to be welded is parallel to the diagonal datum line, so that the image symmetry can be realized when the optical fiber is shot by the camera device in the welding unit, the image of the optical fiber welding is clear and fine, the misjudgment rate is reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the positional relationship of the polarization maintaining fiber fusion splicer structure.
Fig. 2 is a schematic diagram of the grid reference line of the present embodiment.
Fig. 3 is a schematic diagram showing a relationship between the positioning method of the optical fiber end face and the imaging device in the present embodiment.
Fig. 4A is a schematic diagram of the positioning manner of an optical fiber to be spliced in the case of aligning and splicing the slow axis-slow axis (also the fast axis-fast axis) in the present embodiment.
Fig. 4B is a schematic diagram of another positioning method of the optical fibers to be spliced in the case of aligning and splicing the slow axis-slow axis (also the fast axis-fast axis) in the present embodiment.
Fig. 5A is a schematic diagram of the positioning mode of an optical fiber to be spliced in the case of aligning and splicing the slow axis and the fast axis (also the fast axis and the slow axis) in the present embodiment.
FIG. 5B is a schematic diagram showing the positioning of another optical fiber to be spliced in the case of slow-axis-fast-axis (also fast-slow-axis) alignment splicing in the present embodiment.
Fig. 6A is a schematic diagram showing a positioning manner of an optical fiber to be spliced when the slow axis-slow axis 45 ° (also slow axis-fast axis 45 °) is fusion spliced in a dislocation manner in the present embodiment.
Fig. 6B is a schematic diagram of the positioning mode of another optical fiber to be spliced when the slow axis-slow axis 45 ° (also slow axis-fast axis 45 °) is spliced in a dislocation manner in the present embodiment.
Fig. 7A is an image of the optical fibers before fusion-splicing, which is captured by the image capturing device of the present embodiment.
Fig. 7B is a fused fiber image captured by the imaging device of the present embodiment.
Fig. 8 is a schematic diagram showing the relative positional relationship between an optical fiber to be fusion spliced and a grid reference line in an optical fiber positioning method in the prior art.
Fig. 9 is a schematic diagram showing a relationship between a positioning method of an optical fiber and an imaging device in the related art.
Fig. 10A is a prior art image of an optical fiber before fusion splice taken by an imaging device.
Fig. 10B is a fused fiber image captured by an imaging device of the prior art.
In the figure: 1. an optical fiber fusion unit; 2. a rotatable optical fiber clamp; 3. an optical fiber end face positioning device; 31. a microscope; 32. a display screen; 33. grid datum line; 331. perpendicular to the reference line; 332. diagonal fiducial lines; 3321. a positive 45 ° baseline; 3322. a negative 45 ° baseline; 4. welding the display; 5. an image pickup device; 6. stress regions.
Description of the embodiments
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Referring to fig. 1, a polarization maintaining optical fiber fusion splicer includes an optical fiber fusion splicing unit 1 for splicing optical fibers, a rotatable optical fiber clamp 2 for positioning the optical fibers, an optical fiber cutter for cutting the end faces of the optical fibers, and an optical fiber end face positioning device 3 for performing angular positioning on the end faces of the optical fibers.
Referring to fig. 1 and 2, the optical fiber end face positioning device 3 includes a microscope 31, a display screen 32, and a grid reference line 33, the microscope 31 is electrically connected to the display screen 32 and displays an image of the optical fiber end face on the display screen 32, the grid reference line 33 is provided on the display screen 32, and the grid reference line 33 includes a set of vertical reference lines 331 which are vertical, and two sets of diagonal reference lines 332 which are vertical to each other and are each 45 ° to the vertical reference lines 331. Two sets of diagonal fiducial lines 332, one set defined as positive 45 ° fiducial line 3321 and one set defined as negative 45 ° fiducial line 3322.
In the angular positioning process, the rotatable optical fiber clamp 2 with the optical fibers to be welded with the cut end faces is installed at the lens of the microscope 31, the end faces of the optical fibers to be welded are amplified by the microscope 31, and the end face images are displayed on the display screen 32, so that a worker can adjust the relative position relationship between the central connecting lines of the two stress areas 6 of the optical fiber end faces and the grid datum line 33 by rotating the rotatable optical fiber clamp 2, and the angular positioning of the optical fiber end faces is completed, and the rotatable optical fiber clamp 2 can refer to an optical fiber welding machine and an optical fiber welding method disclosed in patent publication No. CN 106908902A.
The optical fiber fusion unit 1 is used for completing fusion of two to-be-fused optical fibers positioned in an angle direction. Before fusion splicing, the optical fibers to be fusion spliced which have undergone angular positioning are transferred into the optical fiber fusion splicing unit 1 by using the rotatable optical fiber clamps 2, and the two rotatable optical fiber clamps 2 are disposed in opposition. Referring to fig. 3, two image pickup devices 5 are disposed in the optical fiber fusion unit 1, the two image pickup devices 5 may be CCDs or CMOS, the two image pickup devices 5 are located at intermediate positions of two optical fibers to be fused, the two image pickup devices 5 are symmetrically disposed with vertical lines perpendicular to central axes of the optical fibers to be fused, photographing optical paths of the two image pickup devices 5 are orthogonally disposed, and a horizontal connecting line between the two image pickup devices 5 is perpendicular to the central axes of the optical fibers to be fused. In the present embodiment, the optical path direction of one image pickup device 5 is perpendicular to the plus 45 ° reference line 3321, and the optical path direction of the other image pickup device 5 is perpendicular to the minus 45 ° reference line 3322.
Returning to fig. 1, the optical fiber fusion unit 1 further includes a fusion display 4, the fusion display 4 is electrically connected with two image capturing devices 5, the two image capturing devices 5 conduct optical fiber images in the fusion process to the fusion display 4, the fusion display 4 displays images before and after fusion of two optical fibers to be fused, and a worker observes and confirms the fusion images, so as to determine whether the fusion quality meets the standard.
The embodiment of the application discloses an end face positioning method of a polarization maintaining optical fiber fusion splicer, which comprises the following steps: step 1: a grid reference line 33 is provided on the display screen 32 for displaying the end face of the optical fiber, and the grid reference line 33 includes a set of vertical reference lines 331 which are vertical, and two sets of diagonal reference lines 332 which are mutually vertical and are each 45 ° to the vertical reference lines 331.
Referring to fig. 4A, two sets of diagonal fiducial lines 332, one set defined as positive 45 ° fiducial line 3321 and one set defined as negative 45 ° fiducial line 3322.
Step 2: the optical fibers to be welded are positioned in an angular direction, the positions of the end faces of the optical fibers to be welded are determined by using the grid reference lines 33, and finally, the central connecting lines of the two stress areas 6 of at least one optical fiber to be welded are parallel to one diagonal reference line 332.
In the angular positioning process, the rotatable optical fiber clamp 2 is used for loading the optical fibers to be welded after cutting the end faces, the rotatable optical fiber clamp 2 is placed at the microscope 31, the end faces of the optical fibers are amplified by the microscope 31 and displayed on the display screen 32, a worker operates the rotatable optical fiber clamp 2 so as to enable the optical fibers to be welded to rotate around the central axis of the optical fibers, the end face positions of the optical fibers to be welded are adjusted through the grid datum lines 33 on the display screen 32, in the embodiment, the central connecting line of two stress areas 6 of at least one optical fiber to be welded is parallel to one group of diagonal datum lines 332, and after the positioning of the end face positions is completed, the positions of the optical fibers to be welded are locked by the rotatable optical fiber clamp 2. In determining whether the center line of the two stress regions 6 is parallel to the diagonal fiducial line 332, it is preferable to determine whether the center line of the two stress regions is parallel to the diagonal fiducial line 332 by referencing the tangency or tangency amount of one of the stress region 6 edges to one of the set of diagonal fiducial lines 332.
Referring to fig. 4A and 4B, in some embodiments, in step 2, the center lines of the two stress regions 6 of the two optical fibers to be fusion spliced are disposed to be respectively parallel to the two sets of diagonal reference lines 332. The center line of the two stress regions 6 of one of the optical fibers to be welded is parallel to the positive 45 ° reference line 3321, and the center line of the two stress regions 6 of the other optical fiber to be welded is parallel to the negative 45 ° reference line 3322. In the art, the center line of the two stress regions 6 of the polarization maintaining fiber is called a slow axis, and the direction orthogonal to the slow axis is called a fast axis, and the above-mentioned slow axis-slow axis (also referred to as a fast axis-fast axis) is aligned and welded.
Referring to fig. 5A and 5B, in some embodiments, the center line of the two stress regions 6 of the two optical fibers to be fusion spliced is set parallel to the same set of diagonal reference lines 332 in step 2. The central lines of the two stress areas 6 of the two optical fibers to be welded are parallel to the positive 45-degree datum line or parallel to the negative 45-degree datum line. The above is a slow axis-fast axis (also fast axis-slow axis) alignment fusion.
Referring to fig. 6A and 6B, in some embodiments, the center line of the two stress regions 6 of one optical fiber to be fusion spliced is set to be parallel to any one set of diagonal reference lines 332, and the center line of the two stress regions 6 of the other optical fiber to be fusion spliced is set to be parallel to the vertical reference line 331 in step 2. The center line of the two stress regions 6 of one of the optical fibers to be welded is parallel to the positive 45 ° reference line or parallel to the negative 45 ° reference line, and the center line of the two stress regions 6 of the other optical fiber to be welded is parallel to the vertical reference line 331. The above is slow axis-slow axis 45 ° (also slow axis-fast axis 45 °) dislocation fusion.
Step 3: referring to fig. 3, the optical path direction of the image pickup device 5 for photographing the optical fibers in the fusion splicing unit is set to be perpendicular to one of the diagonal reference lines 332, and the fusion splicing quality is judged by observing the image of the optical fibers during fusion splicing.
In some embodiments, the image pickup device 5 may be a CCD or CMOS.
In some embodiments, two image capturing devices 5 are provided, and the optical path directions of the two image capturing devices 5 are perpendicular to each other and to the set of diagonal reference lines 332, so that the optical path direction of one image capturing device 5 is perpendicular to the positive 45 ° reference line 3321, and the optical path direction of the other image capturing device 5 is perpendicular to the negative 45 ° reference line 3322. The optical fibers to be welded, which are subjected to angular positioning in the step 2, are transferred into the optical fiber welding unit 1 by using the rotatable optical fiber clamp 2, two image pick-up devices 5 shoot the two optical fibers to be welded, welding images are conducted to the welding display 4, and the optical fiber images before and after welding are displayed by the welding display 4, so that a worker can conveniently judge the welding quality through the images.
Referring to fig. 3, since the center line of the two stress regions 6 of the optical fiber to be fused is set to be parallel to the diagonal reference line 332 during the angular positioning of the optical fiber to be fused. When the slow axis-slow axis or fast axis-fast axis alignment welding is adopted, the light path direction of one image pickup device 5 is collinear with the central connecting line of the two stress areas 6 of the optical fiber to be welded, the light path direction of the other image pickup device 5 is perpendicular to the central connecting line of the two stress areas 6 of the optical fiber to be welded, the CCD1 in FIG. 3 easily positions minus 45 degrees towards the optical fiber, the CCD2 looks at the optical fiber in the direction, and the two stress areas 6 are overlapped in practice. The CCD2 is easy to position the optical fiber which is oriented at 45 degrees, the CCD1 looks at the optical fiber in this orientation, and the two stress areas are actually overlapped, so that the end face structure of the optical fiber to be welded is symmetrical with respect to the optical paths of the two image pickup devices 5, the brightness of the light on both sides of the optical fiber to be welded is consistent when the light passes through the optical fiber to be welded, referring to fig. 7A and 7B, fig. 7A is an image of the optical fiber before welding, which is shot by the end face positioning method of the present embodiment, and fig. 7B is an image of the optical fiber after welding, which is shot by the end face positioning method of the present embodiment, at this time, the shot image is clear and fine when displayed, and the display of the image after welding is more accurate and free from distortion. In the previous positioning method of the optical fiber to be welded, referring to fig. 8, the center line of the two stress areas 6 of the optical fiber to be welded is set to be vertical or horizontal and then transferred into the optical fiber welding unit 1 for welding, at this time, referring to fig. 9, the structure of the end face of the optical fiber to be welded is asymmetric with respect to the optical path direction of the image pickup device 5, so that the brightness of the two sides of the light is different in the process of reaching the image sensor of the image pickup device 5, referring to fig. 10A and 10B, fig. 10A is the optical fiber image before welding, which is captured by the end face positioning method shown in fig. 9, and fig. 10B is the optical fiber image after welding, which is captured by the end face positioning method shown in fig. 9, so that the captured image is easy to generate a breakpoint or a discontinuity, and the problem is caused by the light of the image pickup device 5, but not the problem of the welding quality of the optical fiber itself is easy to cause a problem when the staff observes the image after welding, the problem is generated by the problem of the image judgment of the welding quality, and the problem is caused by the problem of the light of the image pickup device 5, so that the production efficiency is reduced.
The foregoing description of the preferred embodiments of the application is not intended to limit the scope of the application in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (7)
1. The end face positioning method of the polarization maintaining fiber fusion splicer is characterized by comprising the following steps of:
step 1: setting a grid datum line (33) on a display screen (32) for displaying the end face of the optical fiber, wherein the grid datum line (33) comprises a group of vertical datum lines (331) which are vertical, and two groups of diagonal datum lines (332) which are mutually vertical and are 45 degrees with the vertical datum lines (331);
step 2: performing angular positioning on the optical fibers to be welded, determining the positions of the end faces of the optical fibers to be welded by utilizing grid reference lines (33), and finally enabling the central connecting lines of two stress areas (6) of at least one optical fiber to be welded to be parallel to one group of diagonal reference lines (332);
step 3: the direction of the optical path of an imaging device (5) for photographing the optical fibers in the fusion unit is set to be perpendicular to one of the diagonal reference lines (332), and the fusion quality is judged by observing the image of the optical fibers during fusion.
2. The method according to claim 1, wherein in the step 2, it is determined whether the central line of the two stress areas (6) is parallel to the diagonal reference line (332) by referring to the tangential or tangential amount of the edges of the stress areas (6) and the diagonal reference line (332).
3. The method according to claim 1, wherein in the step 2, the central connecting lines of the two stress areas (6) of the two optical fibers to be welded are set to be parallel to the two sets of diagonal reference lines (332), respectively.
4. The method for positioning the end face of a polarization maintaining fiber fusion splicer according to claim 1, wherein in the step 2, the central connecting lines of the two stress areas (6) of the two optical fibers to be fused are set to be parallel to the same set of diagonal reference lines (332).
5. The method according to claim 1, wherein in the step 2, the central line of the two stress areas (6) of one optical fiber to be welded is set to be parallel to any one set of diagonal reference lines (332), and the central line of the two stress areas (6) of the other optical fiber to be welded is set to be parallel to the vertical reference line (331).
6. The method for positioning the end face of the polarization maintaining optical fiber fusion splicer according to claim 1, wherein two image capturing devices (5) in the step 3 are provided, and the optical path directions of the two image capturing devices (5) are perpendicular to each other and are perpendicular to a set of diagonal reference lines (332).
7. The optical fiber end face positioning device of the polarization maintaining optical fiber fusion splicer is characterized by comprising a microscope (31), a display screen (32) and a grid datum line (33), wherein the microscope (31) is electrically connected with the display screen (32) and displays an image of the optical fiber end face on the display screen (32), the grid datum line (33) is arranged on the display screen (32), and the grid datum line (33) comprises a group of vertical datum lines (331) and two groups of diagonal datum lines (332) which are mutually perpendicular and are 45 degrees with the vertical datum lines (331); the central connecting line of two stress areas (6) of at least one optical fiber to be welded is parallel to one diagonal datum line (322), the light path direction of an imaging device (5) for shooting the optical fiber in the welding unit is arranged to be perpendicular to one diagonal datum line (332), and the welding quality is judged by observing the image of the optical fiber in the welding process.
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| CN116931165A (en) * | 2023-07-28 | 2023-10-24 | 江苏光扬光电科技有限公司 | Bowtie type polarization maintaining fiber high-precision counter shaft method based on feature point extraction |
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