WO2022210911A1 - 融着接続装置及びコア位置特定方法 - Google Patents
融着接続装置及びコア位置特定方法 Download PDFInfo
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- WO2022210911A1 WO2022210911A1 PCT/JP2022/016087 JP2022016087W WO2022210911A1 WO 2022210911 A1 WO2022210911 A1 WO 2022210911A1 JP 2022016087 W JP2022016087 W JP 2022016087W WO 2022210911 A1 WO2022210911 A1 WO 2022210911A1
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- 238000007526 fusion splicing Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 136
- 230000004927 fusion Effects 0.000 claims description 24
- 230000002159 abnormal effect Effects 0.000 claims description 18
- 230000005856 abnormality Effects 0.000 claims description 7
- 230000004807 localization Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 238000005253 cladding Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000002019 doping agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000904 thermoluminescence Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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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
- G02B6/2555—Alignment or adjustment devices for aligning prior to splicing
-
- 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
-
- 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
- G02B6/2553—Splicing machines, e.g. optical fibre fusion splicer
Definitions
- the present disclosure relates to a fusion splicer and core location method.
- This application claims priority based on Japanese Application No. 2021-061019 dated March 31, 2021, and incorporates all the descriptions described in the Japanese Application.
- Patent Document 1 describes a method for identifying the type of optical fiber in a fusion splicer.
- a fusion splicer includes a pair of discharge electrodes for fusion splicing a pair of optical fibers together, an imaging element for imaging the pair of optical fibers, and image processing for performing image processing on the pair of optical fibers imaged by the imaging element. and
- the imaging device acquires an image of the optical fiber heated by the discharge and an image of the optical fiber not heated.
- the image processing unit identifies the type of optical fiber by performing image processing on the image of the optical fiber in a heated state and the image of the optical fiber in an unheated state.
- Patent Document 2 describes specifying the eccentricity of the core of an optical fiber in a method for coupling optical waveguides.
- heating the optical waveguide excites the core and emits visible light from the core.
- the position of the core is identified from the intensity distribution of the emitted visible light.
- the illumination unit illuminates the optical waveguide, and the clad position is specified by measuring the intensity distribution of the light with which the optical waveguide is illuminated.
- the eccentricity of the core in the optical fiber is specified from the specified core position and clad position.
- Patent Document 3 describes a fusion splicing device that heats a pair of optical fibers by electric discharge. Fusion splicers capture images of thermoluminescence produced from the core and cladding of an optical fiber heated by an electrical discharge.
- the core dopant concentration is higher than the cladding dopant concentration. Therefore, the acquired luminance waveform of thermoluminescence has a peak at the core portion. This peak has a high correlation with the MFD (Mode Field Diameter) of the optical fiber.
- the MFD of the optical fiber is obtained from the luminance waveform by using the fact that the peak of the luminance waveform has a high correlation with the MFD.
- a fusion splicing device is a fusion splicing device that fusion splices a pair of optical fibers to each other by electric discharge.
- the fusion splicer includes a discharge electrode that generates a discharge, a microscope that acquires luminance information from the optical fiber heated by the discharge, and distribution information that indicates the relationship between the position in the radial direction of the optical fiber and the luminance information. and a core position specifying unit for specifying the position of the core of the optical fiber from the distribution information.
- the microscope acquires luminance information multiple times with a time lag.
- the distribution information acquisition unit acquires distribution information from each of the plurality of pieces of luminance information.
- the core position specifying unit performs weighting such that the weight of the distribution information based on the brightness information acquired earlier among the plurality of distribution information is greater than or equal to the weight of the distribution information based on the brightness information acquired later, and performs the weighting of the optical fiber. Locate the core.
- a core position specifying method is a core position specifying method for specifying the position of each core of a pair of optical fibers when the pair of optical fibers are fusion-spliced to each other by electric discharge.
- the core position identification method includes the steps of generating a discharge, obtaining luminance information from the optical fiber heated by the discharge, and obtaining distribution information indicating the relationship between the position in the radial direction of the optical fiber and the luminance information. and identifying the position of the core of the optical fiber from the distribution information.
- the luminance information is obtained multiple times with a time difference.
- distribution information distribution information is acquired from each of the plurality of pieces of luminance information.
- weighting is performed such that the weight of the distribution information based on the previously obtained brightness information among the plurality of pieces of distribution information is greater than or equal to the weight of the distribution information based on the subsequently obtained brightness information. Locate the core of the optical fiber.
- FIG. 1 is a diagram for explaining an outline of a fusion splicing device according to one embodiment.
- FIG. 2 is a diagram showing an optical system for observing optical fibers in the fusion splicer of FIG.
- FIG. 3 is a diagram schematically showing the positional relationship between the light source and microscope in the optical system of FIG. 2 and the optical fiber.
- FIG. 4 is a luminance waveform showing the relationship between the radial position of the optical fiber and the luminance obtained from the luminance image.
- FIG. 5 is a diagram schematically showing a configuration relating to discharge to an optical fiber, observation of the optical fiber, and acquisition of distribution information.
- FIG. 1 is a diagram for explaining an outline of a fusion splicing device according to one embodiment.
- FIG. 2 is a diagram showing an optical system for observing optical fibers in the fusion splicer of FIG.
- FIG. 3 is a diagram schematically showing the positional relationship between the light source and microscope in the optical system of FIG. 2 and the optical
- FIG. 6 is a graph schematically showing the relationship (distribution information) between the radial position of the optical fiber and the luminance of the luminance image of the optical fiber due to light emission.
- FIG. 7 is a flowchart illustrating example steps of a core localization method according to one embodiment.
- the resolution of the microscope is not sufficient, it may not be possible to accurately identify the position of the core from the image of the optical fiber.
- the position of the peak cannot be obtained appropriately in the luminance waveform.
- An object of the present disclosure is to provide a fusion splicing device and a core position specifying method that can specify the position of the core of an optical fiber with high accuracy.
- a fusion splicing device is a fusion splicing device that fusion splices a pair of optical fibers to each other by electric discharge.
- the fusion splicer includes a discharge electrode that generates a discharge, a microscope that acquires luminance information generated from the optical fiber heated by the discharge, and distribution information that indicates the relationship between the position in the radial direction of the optical fiber and the luminance information. and a core position specifying unit for specifying the position of the core of the optical fiber from the distribution information.
- the microscope acquires luminance information multiple times with a time lag.
- the distribution information acquisition unit acquires distribution information from each of the plurality of pieces of luminance information.
- the core position specifying unit performs weighting such that the weight of the distribution information based on the brightness information acquired first among the plurality of distribution information is greater than or equal to the weight of the distribution information based on the brightness information acquired later, and performs the weighting of the optical fiber. Locate the core.
- the microscope includes an observation lens group and an imaging device.
- a core position specifying method is a core position specifying method for specifying the position of each core of a pair of optical fibers when the pair of optical fibers are fusion-spliced to each other by electrical discharge.
- the core position identification method includes the steps of generating a discharge, obtaining luminance information of light emitted from the optical fiber heated by the discharge, and a distribution showing the relationship between the position in the radial direction of the optical fiber and the luminance information. Obtaining information; and identifying the position of the core of the optical fiber from the distribution information.
- the luminance information is obtained multiple times with a time difference.
- distribution information distribution information is acquired from each of the plurality of pieces of luminance information.
- weighting is performed such that the weight of the distribution information based on the previously obtained brightness information among the plurality of pieces of distribution information is greater than or equal to the weight of the distribution information based on the subsequently obtained brightness information. Locate the core of the optical fiber.
- a pair of optical fibers are heated by electrical discharge.
- the core emits more light than the cladding.
- the core position is identified using the property of the core to emit light more intensely.
- a plurality of pieces of distribution information indicating the relationship between the position in the radial direction of the optical fiber and the luminance information of the emitted light are acquired, and the position of the core is specified from the plurality of pieces of distribution information. Therefore, by using a plurality of pieces of distribution information, variations in the positions of the identified cores can be suppressed, so that the accuracy of the positions of the identified cores can be improved.
- Distribution information based on luminance information of the optical fiber due to light emission changes with the lapse of time.
- a high luminance portion occurs in the portion corresponding to the core in the luminance distribution due to strong light emission from the core.
- the peak of this luminance distribution becomes broader as time passes, it becomes more difficult to specify the exact position of the core from the distribution information as time passes.
- the peak in the distribution information that has not been discharged for a long time is not broad, the accurate position of the core can be identified from the distribution information.
- a plurality of pieces of distribution information are weighted so that the weight of the distribution information based on the luminance information obtained earlier is greater than or equal to the weight of the distribution information based on the luminance information obtained later, thereby specifying the position of the core.
- the position of the core can be specified by increasing the weight of the distribution information that is not broad, so that the accuracy of the position of the specified core can be improved.
- the core position specifying unit may perform weighting so that the weight of the distribution information based on the luminance information obtained earlier among the plurality of pieces of distribution information is higher than the weight of the distribution information based on the luminance information obtained later. In this case, weighting is performed so that the weight of the distribution information based on earlier luminance information whose peak is not broad is greater than the weight of the distribution information based on later luminance information. Therefore, it is possible to further improve the positional accuracy of the core to be specified.
- the microscope acquires luminance information n times with a time lag (n is a natural number of 3 or more), the distribution information acquisition unit acquires distribution information from each of the n pieces of luminance information, and the core position specifying unit acquires n - Weighting may be performed so that the weight of the distribution information based on the brightness information acquired for the first time is greater than the weight of the distribution information based on the brightness information acquired for the nth time.
- the weight of the distribution information based on the luminance information acquired last n-th time which is one before the last, is weighted more than the weight of the distribution information based on the luminance information acquired last n-th time, and the core position identify.
- the weight of the distribution information based on the luminance information acquired at the (n-1)th time is made heavier than the distribution information based on the luminance information acquired at the nth time with a broader peak, and the position of the core is specified. , the accuracy of the position of the identified core can be further improved.
- the core position specifying unit determines whether or not there is an abnormality in each of the plurality of distribution information, eliminates the distribution information determined to be abnormal before specifying the position of the core, and eliminates the distribution information determined to be abnormal.
- the positions of the cores may be specified by using the later multiple pieces of distribution information as the new multiple pieces of distribution information. In this case, the abnormal distribution information is not weighted, and the abnormal distribution information is eliminated before weighting. Then, the position of the core is specified by using the distribution information after the removal as a new plurality of pieces of distribution information. Therefore, by excluding abnormal distribution information, it is possible to further improve the accuracy of the position of the identified core.
- FIG. 1 is a diagram for explaining an overview of a fusion splicer.
- the fusion splicer 1 is a fusion splicer for fusion splicing a pair of optical fibers F to each other.
- a fusion splicer 1 includes a V-groove clamp 2 having a V-groove 2b, a covering clamp 3, a pair of discharge electrodes 4, a V-groove driving section 9 for driving the V-groove clamp 2, and a control section 10.
- the control unit 10 has a distribution information acquisition unit 7 and a core position specifying unit 8 .
- the V-groove clamp 2 and the coating clamp 3 are parts that support the optical fiber F to be fusion-spliced.
- An optical fiber F to be connected is positioned in the V-groove 2 b of the V-groove clamp 2 .
- a V-groove clamp 2 supports a portion of the bare fiber from which the coating has been removed from the optical fiber F to expose the glass portion.
- a coating clamp 3 holds the coated portion of the optical fiber F.
- a pair of discharge electrodes 4 are arranged so as to face each other along a direction crossing (for example, perpendicular to) the direction in which the optical fiber F extends.
- Optical fibers F are aligned in each of the plurality of V-grooves 2b.
- the V-groove drive section 9 and the control section 10 align the pair of optical fibers F so that the pair of optical fibers F are aligned on a straight line.
- a discharge is generated between the discharge electrodes 4, and the ends of the pair of optical fibers F are heated and fusion-spliced.
- the control unit 10 controls the discharge current or the discharge time of the discharge electrode 4 so that the fusion splicing is performed under the fusion splicing conditions suitable for the type of the optical fiber F.
- the fusion splicer 1 includes an image observing mechanism 11 for observing the optical fiber F placed in the V groove 2b of the V groove clamp 2.
- FIG. 2 shows the configuration of the image observation mechanism 11.
- the image observing mechanism 11 has, for example, a light source 12 and a microscope 13 .
- the light source 12 includes a first light source 12b and a second light source 12c.
- the microscope 13 includes a first microscope 13b and a second microscope 13c.
- the first light source 12b and the first microscope 13b are arranged along the X direction with the optical fiber F interposed therebetween.
- the second light source 12c and the second microscope 13c are arranged along the Y direction intersecting the X direction while sandwiching the optical fiber F therebetween.
- the angle between the X direction and the Y direction is, for example, 60° or more and 120° or less.
- the first light source 12b emits light to the optical fiber F along the X direction.
- the second light source 12c emits light to the optical fiber F along the Y direction.
- the first microscope 13b observes the core F1 and the clad F2 of the optical fiber F by receiving light emitted along the X direction from the first light source 12b.
- the second microscope 13c observes the core F1 and clad F2 of the optical fiber F by receiving light emitted along the Y direction from the second light source 12c.
- the configurations and functions of the first light source 12b and the second light source 12c are, for example, the same.
- the configurations and functions of the first microscope 13b and the second microscope 13c are, for example, identical to each other. Therefore, hereinafter, the first light source 12b and the second light source 12c will be collectively described as the light source 12 unless it is necessary to identify them.
- the first microscope 13b and the second microscope 13c will be collectively referred to as a microscope 13 for explanation.
- FIG. 3 is a diagram schematically showing the positional relationship among the light source 12, optical fiber F and microscope 13.
- the light source 12 is, for example, a light emitting element such as a light emitting diode.
- the light source 12 emits light H that is red light.
- the microscope 13 observes the optical fiber F by receiving the light H emitted from the light source 12 to the optical fiber F placed on the V-groove 2b.
- the microscope 13 has, for example, an observation lens and a camera.
- the camera is a CCD camera (Charge-Coupled Device Camera), a CMOS camera (Complementary MetalOxide Semiconductor Camera), or the like.
- CCD camera Charge-Coupled Device Camera
- CMOS camera Complementary MetalOxide Semiconductor Camera
- the position of the microscope 13 is fixed in the fusion splicing device 1, and the position of the microscope 13 remains unchanged.
- Observation results by the microscope 13 are acquired as images, for example.
- An image of the optical fiber F acquired by the microscope 13 is transmitted to the control unit 10 as image data.
- the V-groove drive section 9 is driven based on a control signal input from the control section 10, for example.
- the V-groove driving section 9 moves the V-groove 2b.
- the control unit 10 for example, a CPU (central processing unit) configured by one or a plurality of integrated circuits (ICs) is used.
- the control unit 10 acquires an image of the optical fiber F from the microscope 13, and the image of the optical fiber F is stored in the control unit 10, for example.
- the control unit 10 includes a core position specifying unit 8 that acquires the center position of the core F1 of the optical fiber F from the image data of the optical fiber F that has been acquired.
- the control section 10 may output a control signal to the V-groove driving section 9 using the acquired result to control the V-groove driving section 9 .
- the control unit 10 acquires the luminance waveform of the optical fiber F from the acquired image data of the optical fiber F.
- FIG. 4 shows exemplary luminance waveforms D1 and D2 showing the relationship between the radial position of the optical fiber F and the luminance of the image.
- the core F1 portion is displayed with high brightness and the clad F2 portion is displayed with low brightness.
- the luminance decreases at the clad F2 of the optical fiber F and increases when reaching the core F1 of the optical fiber F.
- FIG. A peak D12 with high brightness appears in the brightness waveforms D1 and D2 near the center between a pair of valleys D11 with low brightness.
- the control unit 10 may acquire the outer diameter of the optical fiber F using the luminance waveforms D1 and D2. For example, the control unit 10 may extract the bright portion corresponding to the peak portion D12 as the portion corresponding to the core, and acquire the width of the bright portion.
- the luminance waveform D1 of which the resolution of the microscope 13 is high the waveform at the crest D12 can be acquired with high accuracy, so the position of the core F1 can be specified with high accuracy.
- the accuracy of the waveform at the ridges D12 may be low, so there is a possibility that the position of the core F1 cannot be identified with high accuracy.
- FIG. 5 is a diagram schematically showing the configuration of the fusion splicing device 1 for specifying the position of the core F1.
- the core F1 of the optical fiber F emits more light than the clad F2 due to the influence of the dopant.
- the microscope 13 acquires an image of light emission from the core F1 and acquires an image of light emission from the optical fiber F.
- the distribution information acquisition unit 7 acquires, as distribution information, a waveform representing the distribution of light emission from the photographed image of the light emission of the optical fiber F acquired by the microscope 13 .
- the “photographed image of light emission (image of light emission)” corresponds to an example of “luminance information”
- the “waveform (indicating the distribution of light emission)” corresponds to an example of “distribution information”.
- the microscope 13 captures the optical fiber F emitting light multiple times with a time lag
- the distribution information acquiring unit 7 acquires the waveform multiple times with a time lag.
- FIG. 6 is a graph schematically showing distribution information indicating the relationship between the position in the radial direction of the optical fiber F and luminance information.
- Distribution information B3 obtained at time t3, distribution information B4 obtained at time t4 after time t3, and distribution information B5 obtained at time t5 after time t4 are shown.
- the number of pieces of distribution information to be acquired does not have to be 5, and may be 2, 3, 4, or 6 or more.
- the time from time t1 to time t2, the time from time t2 to time t3, the time from time t3 to time t4, and the time from time t4 to time t5 are, for example, the same.
- all of the distribution information B1, B2, B3, B4, and B5 have a peak K near the center of the optical fiber F where the core F1 is presumed to exist.
- the peak K gradually becomes broader as time elapses from discharge. Specifically, although a clear peak K is obtained at time t1 immediately after discharge, the peak K gradually becomes smoother as time passes from time t2 to time t3. Then, after the time t3, the waveform does not change so much, and the peak K becomes broad.
- the peak K becomes broader with the passage of time. Therefore, it is possible to specify the position of the core F1 by placing importance on the distribution information obtained at an earlier timing. desirable.
- the core position specifying unit 8 specifies the position of the core F1 of the optical fiber F from the distribution information B1 to B5 acquired by the distribution information acquiring unit 7, for example.
- the core position specifying unit 8 weights the distribution information B1 obtained earlier among the distribution information B1 to B5 so that the weight of the distribution information B1 obtained later is greater than or equal to the weight of the distribution information B2 obtained later, thereby determining the core F1 of the optical fiber F. Locate.
- the core position specifying unit 8 determines that the weight of the distribution information B1 is greater than or equal to the weight of the distribution information B2, the weight of the distribution information B2 is greater than or equal to the weight of the distribution information B3, and the weight of the distribution information B3 is greater than or equal to the weight of the distribution information B4. Moreover, weighting is performed so that the weight of the distribution information B4 is greater than or equal to the weight of the distribution information B5.
- the position of the optical fiber F at the peak K of the distribution information B1 (the position estimated to be the core) is X1
- the position of the optical fiber F at the peak K of the distribution information B2 is X2
- the optical fiber F at the peak K of the distribution information B3 is X3
- the position of the optical fiber F at the peak K of the distribution information B4 is X4
- the position of the optical fiber F at the peak K of the distribution information B5 is X5.
- the core position specifying unit 8 determines whether there is an abnormality in the distribution information B1 to B5.
- the core position specifying unit 8 eliminates distribution information determined to be abnormal before weighting, which will be described later.
- the core position specifying unit 8 compares each of the positions X1 to X5 of the distribution information B1 to B5 with a constant value. Then, the core position specifying unit 8 excludes the distribution information B1 to B5 when the difference between each of the positions X1 to X5 and the constant value is equal to or greater than the threshold.
- a case in which none of the distribution information B1 to B5 is excluded will be exemplified below.
- the core position specifying unit 8 sets the weight (weighting coefficient) to the distribution information B1 to W1, the weight to the distribution information B2 to W2 which is less than or equal to W1, the weight to the distribution information B3 to W3 which is less than or equal to W2, and the weight to the distribution information B4.
- W4, which is less than or equal to W3, and W5, which is less than or equal to W4, is the weight of the distribution information B5, the position Z of the core F1 is specified using the following equation (1).
- the sum of W1 to W5 is one.
- the weighting coefficient for the distribution information Bi (i is a natural number) determined to be abnormal Wi may be set to 0.
- the distribution information Bi determined to be abnormal may be excluded (it may not be included in the calculation) before the positions X1 to X5 are obtained from the distribution information B1 to B5, respectively.
- the positions X1 to X5 are used in determining whether or not there is an abnormality. However, by determining whether or not there is an abnormality based on other criteria and using the determination result, it is possible to eliminate abnormal distribution information before obtaining the positions X1 to X5.
- luminance information X (t, m, n) at a certain time t and a specific position (m, n) (m, n are relative coordinates indicating position information) is first subjected to weighting processing, and the expression ( A weighted average value XS may be obtained as in 2).
- XS(m,n) X(1,m,n) ⁇ W1+X(2,m,n) ⁇ W2+ X(3,m,n) ⁇ W3+X(4,m,n) ⁇ W4+ X(5,m,n) ⁇ W5
- the position Z of the core F1 may be specified using XS(m, n) obtained in this manner.
- FIG. 7 illustrates example steps of a core localization method according to an embodiment.
- a pair of optical fibers F are arranged in the V-groove 2b of the V-groove clamp 2 (step S1).
- the optical fiber F is supported by the V-groove clamp 2 and the coating clamp 3 .
- the optical fibers F are positioned in the V grooves 2b so that the tips of the pair of optical fibers F face each other.
- the light source 12 stops emitting the light H (step S2). That is, the light source 12 is stopped in order to eliminate the influence of the light H from the light source 12 .
- the discharge electrode 4 discharges the optical fiber F (step S3).
- the optical fiber F is heated by the discharge and emits light, and the microscope 13 acquires a luminance image (luminance information) of the emitted light.
- the distribution information acquisition unit 7 acquires the above-described distribution information from the luminance information (step S4).
- step S5 it is determined whether or not the distribution information acquisition unit 7 has acquired X pieces of distribution information (X is a natural number of 2 or more) (step S5). Then, when it is determined that X pieces of distribution information have been acquired, the process proceeds to step S6. On the other hand, if it is determined that X pieces of distribution information have not been acquired, the process returns to step S4, and acquisition of luminance information by the microscope 13 and acquisition of distribution information by the distribution information acquisition unit 7 are executed again.
- X is a natural number of 2 or more
- the core position specifying unit 8 specifies the provisional position of the core F1 from each of the distribution information B1 to B5. As a specific example, the core position specifying unit 8 acquires the positions X1 to X5 of the peak K shown in FIG. 6 as the provisional positions of the core F1.
- the core position specifying unit 8 determines whether or not there is an abnormality in each of the distribution information B1 to B5 acquired by the distribution information acquisition unit 7, and eliminates the distribution information determined to be abnormal (step S7). Then, the core position specifying unit 8 weights each of the pieces of distribution information B1 to B5 that are not determined to be abnormal (step S8). As a specific example, the core position specifying unit 8 assigns a weight W1 to the distribution information B1, a weight W2 to the distribution information B2, a weight W3 to the distribution information B3, a weight W4 to the distribution information B4, and a weight W4 to the distribution information B5. Determine the weight W5.
- the respective weights are determined such that the weight W1 is greater than or equal to the weight W2, the weight W2 is greater than or equal to the weight W3, the weight W3 is greater than or equal to the weight W4, and the weight W4 is greater than or equal to the weight W5.
- the core position specifying unit 8 specifies the position of the core F1 of the optical fiber F using the weights W1 to W5 (step S9).
- the core position specifying unit 8 specifies the position Z of the core F1 according to the formula (1) described above.
- the pair of optical fibers F are heated by electric discharge.
- the core F1 emits more light than the clad F2.
- the position of the core F1 is specified using the property that the core F1 emits more intense light.
- Distribution information B1 to B5 indicating the relationship between the position in the radial direction of the optical fiber F and luminance information (for example, the luminance of the image of light emission) is acquired, and the position of the core F1 is specified from the distribution information B1 to B5. Therefore, by using the distribution information B1 to B5, which are a plurality of pieces of distribution information, it is possible to suppress variations in the core F1 to be identified, thereby increasing the accuracy of the position of the core F1 to be identified.
- the distribution information based on the luminance information of the optical fiber F due to light emission changes over time.
- the peak K is generated in the portion of the core F1 due to the strong light emission of the core F1. Since the peak K of the distribution information B1 to B5 becomes broader as time passes, it becomes more difficult to specify the exact position of the core F1 as time passes.
- the peak K of the distribution information B1 which has not been discharged for a long time, is not broad, so the accurate position of the core F1 can be specified from the distribution information B1.
- the distribution information B1 to B5 are weighted so that, for example, the weight W1 of the distribution information B1 based on the luminance information obtained earlier is equal to or greater than the weight W2 of the distribution information B2 based on the luminance information obtained later. to identify the position of the core F1.
- the position of the core F1 can be specified by increasing the weight W1 of the distribution information B1 that is not broad, so the accuracy of the position of the core F1 to be specified can be improved.
- the microscope 13 may acquire the luminance information n times with a time lag (n is a natural number of 3 or more), and the distribution information acquisition unit 7 may acquire the distribution information from each of the n pieces of luminance information.
- the core position specifying unit 8 may perform weighting such that the weight of the distribution information based on the luminance information acquired for the n-1th time is greater than the weight of the distribution information based on the luminance information acquired for the nth time.
- the microscope 13 acquires the luminance information of the optical fiber F five times (for example, images are taken five times) with a time difference, and the distribution information acquisition unit 7 acquires the distribution information based on each of the five pieces of luminance information.
- B1 to B5 may be obtained.
- the core position specifying unit 8 performs weighting so that the weight W4 of the distribution information B4 based on the luminance information obtained the fourth time is greater than the weight W5 of the distribution information B5 based on the luminance information obtained the fifth time. you can go
- the weight of the distribution information based on the n-th acquired brightness information which is one before the last, is weighted higher than the weight of the distribution information based on the last acquired brightness information for the n-th time, and the core F1 Identify the location of Therefore, the weight of the distribution information based on the luminance information acquired at the (n-1)th time is weighted more than the distribution information based on the luminance information acquired at the nth time in which the peak K is broad, and the position of the core F1 is specified. Therefore, the accuracy of the position of the identified core F1 can be improved.
- the core position specifying unit 8 performs weighting such that the weight W1 of the distribution information B1 based on the luminance information obtained for the first time is greater than the weight W2 of the distribution information B2 based on the luminance information obtained the second time. you can go In this case also, the same effect as described above can be obtained.
- the core position specifying unit 8 may perform weighting such that the weight of the distribution information based on the brightness information acquired earlier among the distribution information B1 to B5 is higher than the weight of the distribution information based on the brightness information acquired later. good.
- the weight W1 may be greater than the weight W2
- the weight W2 may be greater than the weight W3
- the weight W3 may be greater than the weight W4
- the weight W4 may be greater than the weight W5.
- the weighting is performed so that the weight of the distribution information based on the previous luminance information where the peak K is not broad is greater than the weight of the distribution information based on the subsequent luminance information, whereby the positional accuracy of the core F1 to be specified can be further enhanced.
- the core position specifying unit 8 determines the presence or absence of an abnormality for each of the distribution information B1 to B5, eliminates the distribution information determined to be abnormal before weighting, and removes the distribution information determined to be abnormal.
- the distribution information B1 to B5 may be used as a new plurality of distribution information B1 to B5 to identify the position of the core F1. In this case, the abnormal distribution information is not weighted, and the abnormal distribution information is eliminated before weighting. Then, the position of the core F1 is specified by using the distribution information B1 to B5 after the exclusion as a new plurality of distribution information B1 to B5. Therefore, by excluding abnormal distribution information, it is possible to further improve the accuracy of the position of the core F1 to be specified.
- the position of the microscope 13 is fixed in the fusion splicing device 1, and the position of the microscope 13 remains unchanged. Even when the microscope 13 is fixed in this way, the microscope 13 acquires luminance information multiple times with a time lag, and the weight W1 of the distribution information B1 based on the previously acquired luminance information is acquired later.
- the core position specifying unit 8 performs weighting so that the weight W2 of the distribution information B2 based on the obtained luminance information is greater than or equal to W2. Therefore, the position of the core F1 can be specified with high accuracy. That is, even when the microscope 13 is fixed or the resolution of the microscope 13 is low, the position of the core F1 can be specified with high accuracy.
- the weight W1 of the distribution information B1 acquired for the first time is greater than or equal to the weight W2 of the distribution information B2, the weight W2 of the distribution information B2 is greater than or equal to the weight W3 of the distribution information B3, and the weight W3 of the distribution information B3 is
- the core position specifying unit 8 that performs weighting so that the weight W4 of the distribution information B4 is greater than or equal to the weight W4 of the distribution information B4 and the weight W4 of the distribution information B4 is greater than or equal to the weight W5 of the distribution information B5 has been described.
- the core locator may use different weighting factors depending on the time since discharge.
- the core position specifying unit assigns a weight r1 to the distribution information obtained from the discharge start time v0 to the time v1, and assigns a weight r2 to the distribution information obtained from the time v1 to the time v2.
- the weight for the distribution information obtained after the time v2 is r3, and the weight r1 may be set to be greater than or equal to the weight r2, and the weight r2 may be set to be greater than or equal to the weight r3.
- distribution information based on luminance information in which a long time has not passed since discharge can be preferentially used to specify the position of the core.
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Abstract
Description
本出願は、2021年3月31日の日本出願第2021-061019号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。
最初に本開示の実施形態を列記して説明する。一実施形態に係る融着接続装置は、一対の光ファイバ同士を放電によって互いに融着接続する融着接続装置である。融着接続装置は、放電を発生させる放電電極と、放電を受けて加熱された光ファイバから生じる輝度情報を取得する顕微鏡と、光ファイバの径方向における位置と輝度情報との関係を示す分布情報を取得する分布情報取得部と、分布情報から光ファイバのコアの位置を特定するコア位置特定部と、を備える。顕微鏡は、時間差をおいて輝度情報を複数回取得する。分布情報取得部は、複数の輝度情報のそれぞれから分布情報を取得する。コア位置特定部は、複数の分布情報のうち先に取得された輝度情報に基づく分布情報の重みが後に取得された輝度情報に基づく分布情報の重み以上となるように重み付けを行って光ファイバのコアの位置を特定する。ここで、顕微鏡は、観察用レンズ群と撮像素子を備えている。
本開示の実施形態に係る融着接続装置及びコア位置特定方法の具体例について図面を参照しながら説明する。図面の説明において同一又は相当する要素には同一の符号を付し、重複する説明を適宜省略する。図面は、理解の容易化のため、一部を簡略化又は誇張して描いている場合があり、寸法比率等は図面に記載のものに限定されない。
Z=(X1)×W1+(X2)×W2+(X3)×W3+
(X4)×W4+(X5)×W5・・・(1)
以上、コア位置特定部8による分布情報の重み付けとコアF1の位置特定の例について説明した。しかしながら、分布情報の重み付け、及びコアF1の位置特定の方法は、上記の例に限られず、適宜変更可能である。
XS(m,n)=X(1,m,n)×W1+X(2,m,n)×W2+
X(3,m,n)×W3+X(4,m,n)×W4+
X(5,m,n)×W5 ・・・(2)
このようにして求めたXS(m,n)を用いてコアF1の位置Zが特定されてもよい。
2…V溝クランプ
2b…V溝
3…被覆クランプ
4…放電電極
7…分布情報取得部
8…コア位置特定部
9…V溝駆動部
10…制御部
11…画像観察機構
12…光源
12b…第1光源
12c…第2光源
13…顕微鏡
13b…第1顕微鏡
13c…第2顕微鏡
B1~B5…分布情報
D1,D2…輝度波形
D11…谷部
D12…山部
F…光ファイバ
F1…コア
F2…クラッド
H…光
K…ピーク
Claims (5)
- 一対の光ファイバ同士を放電によって互いに融着接続する融着接続装置であって、
放電を発生させる放電電極と、
前記放電を受けて加熱された光ファイバからの輝度情報を取得する顕微鏡と、
前記光ファイバの径方向における位置と前記輝度情報との関係を示す分布情報を取得する分布情報取得部と、
前記分布情報から前記光ファイバのコアの位置を特定するコア位置特定部と、
を備え、
前記顕微鏡は、時間差をおいて前記輝度情報を複数回取得し、
前記分布情報取得部は、複数の前記輝度情報のそれぞれから前記分布情報を取得し、
前記コア位置特定部は、複数の前記分布情報のうち先に取得された前記輝度情報に基づく分布情報の重みが後に取得された前記輝度情報に基づく分布情報の重み以上となるように重み付けを行って前記光ファイバのコアの位置を特定する、
融着接続装置。 - 前記コア位置特定部は、複数の前記分布情報のうち先に取得された前記輝度情報に基づく分布情報の重みが後に取得された前記輝度情報に基づく分布情報の重みより重くなるように重み付けを行う、
請求項1に記載の融着接続装置。 - 前記顕微鏡は、時間差をおいて前記輝度情報をn回取得し(nは3以上の自然数)、
前記分布情報取得部は、n個の前記輝度情報のそれぞれから前記分布情報を取得し、
前記コア位置特定部は、n-1回目に取得された前記輝度情報に基づく分布情報の重みがn回目に取得された前記輝度情報に基づく分布情報の重みより重くなるように重み付けを行う、
請求項1又は2に記載の融着接続装置。 - 前記コア位置特定部は、複数の前記分布情報のそれぞれに対して異常の有無を判定し、異常と判定した前記分布情報を、前記コアの位置を特定する前に排除し、前記異常と判定した分布情報を排除した後の複数の前記分布情報を、新たな複数の前記分布情報として前記コアの位置を特定する、
請求項1から請求項3のいずれか一項に記載の融着接続装置。 - 一対の光ファイバ同士を放電によって互いに融着接続するときに前記一対の光ファイバのそれぞれのコアの位置を特定するコア位置特定方法であって、
放電を発生させる工程と、
前記放電を受けて加熱された光ファイバからの輝度情報を取得する工程と、
前記光ファイバの径方向における位置と前記輝度情報との関係を示す分布情報を取得する工程と、
前記分布情報から前記光ファイバのコアの位置を特定する工程と、
を備え、
前記輝度情報を取得する工程では、時間差をおいて前記輝度情報を複数回取得し、
前記分布情報を取得する工程では、複数の前記輝度情報のそれぞれから前記分布情報を取得し、
前記コアの位置を特定する工程では、複数の前記分布情報のうち先に取得された前記輝度情報に基づく分布情報の重みが後に取得された前記輝度情報に基づく分布情報の重み以上となるように重み付けを行って前記光ファイバのコアの位置を特定する、
コア位置特定方法。
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EP22781121.3A EP4318065A4 (en) | 2021-03-31 | 2022-03-30 | FUSION SPLICE AND CORE POSITION SPECIFICATION PROCEDURE |
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