JP3691361B2 - Optical element module assembling apparatus and optical axis adjusting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical element module assembling apparatus used in the process of assembling an optical communication element module composed of a semiconductor laser (hereinafter abbreviated as LD), a lens, and an optical fiber, and in particular, adjusting the optical axis of the optical fiber. The present invention relates to an optical element module assembling apparatus and an optical axis adjusting method.
[0002]
[Prior art]
In a communication optical element module configured to condense light emitted from an LD with a lens and enter an optical fiber, alignment of components constituting the module is performed in order to obtain good optical coupling, so-called optical axis adjustment is performed. assemble.
[0003]
The optical element module has a configuration using two lenses, a first lens for entering the light emitted from the LD and a second lens for collecting the light emitted from the first lens and entering the optical fiber. is there. The optical element module using two lenses has a feature that the tolerance of the lens axis deviation is loose and the manufacturability is good. In addition, since there is a characteristic that loss due to optical coupling can be reduced, this configuration is frequently used in optical element modules that require high performance even though the number of lenses is two and the number of parts is large.
[0004]
In the production of the optical element module, it is necessary to align the optical axis of the second lens with the position of the optical fiber with high accuracy, that is, optical axis adjustment. As a conventional optical axis adjustment method, a method of performing optical axis adjustment while observing the optical output from the end of the optical fiber using an optical output measuring device and searching for a position where the optical output is maximized is performed. However, the conventional method requires a great amount of adjustment time, and requires a method for adjusting the optical axis at high speed.
[0005]
For example, in Japanese Patent Laid-Open No. 8-297229, a CCD camera is used to measure two light fluxes of an LD, calculate a deviation amount between a position where light should be focused and a position where light is currently focused, and drive an XYZ stage. Although a method of adjusting the optical axis at a position where light should be condensed has been proposed in a very short time, it is difficult to adjust the optical axis of the optical fiber because it has a CCD camera above the optical axis. Since it is an optical axis adjustment device for an optical element module that does not use a lens, it is difficult to apply it to manufacture of an optical element module that uses a second lens.
[0006]
In Japanese Patent Laid-Open No. 9-43456, an infrared imaging tube camera is used to image the position of the laser spot of the optical element module, the optical fiber held by the fiber chuck is moved on the XY stage, and the optical fiber end is moved to the laser spot. In the optical element module for fixing the optical fiber by laser welding or the like, if the infrared imaging tube camera is arranged on the upper part of the optical axis, the entire apparatus becomes large and the laser welding emission optical part becomes larger. It is difficult to arrange and the structure for retracting the infrared image pickup tube camera by a Z stage or the like has a problem that it takes a long time to retract, which hinders the speeding up of the optical axis adjustment.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide an optical device module assembling apparatus, particularly a structure of an optical fiber optical axis adjusting unit and an optical axis adjusting method for shortening the optical axis adjusting time in the manufacturing of the optical device module.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in an apparatus for manufacturing an optical element module that is assembled by adjusting an optical axis of an LD, an optical fiber, and a lens, an optical axis adjustment unit of the optical fiber that adjusts the optical axis of the optical fiber and the lens is provided. An imaging means for obtaining an image output of the output beam of the lens in the vicinity of the LD and the optical axis of the lens at a position away from the optical axis while changing the position of the image, and an image obtained by the imaging means A processing device for calculating position data from the positioning means, positioning means for positioning the optical fiber using the position data, and a light output measuring device for measuring the output of the optical fiber when adjusting the positioning means.
[0009]
In a particularly preferred embodiment of the present invention, a fiber bundle that transmits an optical image to the imaging means, a moving mechanism that moves one end of the fiber bundle near the optical axis of the lens and stops at an arbitrary position, and the fiber bundle The optical system and camera which image the optical image image transmitted to the other end of this are provided.
[0010]
Further, in the optical fiber optical axis adjusting method of the present invention, in the optical device module assembling apparatus of the present invention, the LD is set in a light emitting state, the lens is set at a specified position, and the light beam emitted from the lens The laser beam image in the vicinity of the convergence position is focused on the imaging optical system at a position away from the vicinity of the convergence position, and the data at the beam convergence position is measured. The gripping device for the optical fiber to be slid is moved to a predetermined position.
[0011]
According to the apparatus and method of the present invention, the optical axis of a lens and an optical fiber can be adjusted in the assembly manufacturing of an optical element module using a lens by a mechanism capable of measuring the optical axis of the optical element module from a remote position in a space-saving manner. After this, it becomes possible to install a laser welding fixing device for welding the lens portion and the optical fiber portion in the vicinity of the optical fiber, and it is possible to shorten the moving time of the laser welding fixing device and the like, and further optical axis adjustment and optical element Module assembly can be speeded up.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of an optical device module assembly apparatus according to the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is a perspective view of an optical device module assembling apparatus according to an embodiment of the present invention. FIG. 2 is a side view showing a main configuration of the optical device module assembling apparatus. Before describing an embodiment of the present invention, the structure and optical coupling state of an optical element module assembled by the assembly apparatus of the present invention will be described with reference to FIG.
[0014]
As shown in FIG. 3A, the optical element module is assembled by a package 16 having a laser diode (LD) 10, an isolator module 17, and a holder 19 that holds an input end of the optical fiber 14. Inside the package 16 are provided a stem 15 on which the LD 10 is mounted, and a first lens 11 which is built in a cylindrical lens holder 18 and converts divergent light from the LD 10 into parallel light. The isolator module 17 includes an isolator 12 and a second lens 13 for converging parallel light.
[0015]
The lens holder 18 is connected and fixed at the stem 15 and the lens holder mounting surface after optical axis alignment. The stem 15 to which the lens holder 18 is connected and fixed is mounted on the package 16, and the package 16 is sealed. After the package 16 is sealed, the isolator module 17 and the optical fiber 14 in which the second lens 13 and the isolator 12 become one component are optically adjusted and laser-welded and fixed.
[0016]
FIG. 3B shows only the optical system of FIG. 3A extracted, and divergent light emitted from the LD 10 becomes parallel light through the first lens 11, passes through the isolator 12, The light is converged by the two lenses 13 and enters the optical fiber 14. The isolator 12 has a function of removing return light from the second lens 13 and the optical fiber 14.
[0017]
The optical axis adjustment in the two-lens optical element module includes the following two contents.
[0018]
(1) The laser light emitted from the first lens 11 is substantially parallel light, and its optical axis is parallel to the outer shape of the stem 15. This is because the isolator module 17 is fixed to the package 16 in which the stem 15 is stored, so that the parallelism of the laser beam with respect to the package 16 appears.
(2) When the isolator module 17 and the optical fiber 14 are assembled, the amount of light incident on the optical fiber 14 is maximized.
The optical axis adjusting unit and method of the optical fiber of the optical device module assembling apparatus of the present invention are intended for the contents of the above (2).
[0019]
The optical device module assembling apparatus shown in FIG. 1 includes an operation panel 1 on which an operator operates, a YAG laser welding emission optical unit 2 for welding and fixing an optical fiber 14, and an optical image of a light beam from the optical device module. An infrared imaging tube camera 3 for remote detection imaging at a position away from the axis, a YAG laser oscillator 4 for outputting a YAG laser to the YAG laser welding emission optical unit 2, and a fiber bundle for detecting a light beam from the optical element module The optical axis adjustment stage 6 for adjusting the optical axis of the fiber bundle positioning mechanism 5 and the package 16 for positioning the optical axis to the position where the amount of light incident on the isolator module 17 and the optical fiber 14 is maximized. Isolator adjustment stage 7 that positions and adjusts the isolator module 17 when performing the optical axis adjustment And an optical fiber adjusting stage 8 for positioning adjusting the optical fiber 14 in that. 1 does not show the package 16, the isolator module 17, the optical fiber 14, and the optical fiber holder 19 that constitute the optical element module.
[0020]
As shown in FIG. 2, the main configuration of the optical device module assembling apparatus is emitted from the fiber bundle 20 and the package 16 for detecting the convergence position of the convergent light emitted from the second lens in the isolator module 17. A fiber bundle vertical movement unit 35, a fiber bundle XY movement unit 34, which can be moved in the vertical and XY (plane perpendicular to the paper) direction by fixing the photodetector 50 for detecting the total light amount by the fiber bundle positioning mechanism unit 5; An image of the light beam incident on the fiber bundle 20 is taken at the other end of the fiber bundle 20 and the infrared imaging tube camera 3 for displaying an image for confirming the convergence position of the light beam, and the amount of light incident on the optical fiber 14 is maximum. Optical axis adjustment that can move the package fixing mechanism 32 that holds and fixes the package 16 containing the LD 10 in the XYθ direction in order to adjust the optical axis to the position An optical axis adjustment stage 6 having an XYθ moving unit 31 and an isolator capable of moving in the vertical and XY directions while holding the isolator module 17 with an isolator holding mechanism 39 in order to position and adjust the isolator module 17 when performing optical axis adjustment. The isolator adjusting stage 7 having the vertical moving unit 38 and the isolator XY moving unit 37, the fiber holder 19 and the fiber holder holding mechanism 42 for holding the optical fiber 14 for adjusting the positioning of the optical fiber 14, and the optical fiber holding mechanism 44 have the same center. Optical fiber adjustment stage 8 and optical fiber comprising a fiber holder up-and-down moving unit 41 and an optical fiber up-and-down moving unit 43 that can be moved in the XY direction. Power to detect 14 outputs The over data 33 is composed of a base 30 on.
[0021]
Above the optical axis adjustment stage 6, the isolator module 17, the optical fiber 14, the fiber holder 19, and the package 16 are vertically moved and moved up and down to move the YAG laser welding emission optical unit up and down. A camera imaging detection adjustment control unit 48 that arranges a plurality of YAG laser welding emission optical units 2 that can be welded and fixed with a YAG laser at an optimum position by the moving unit 45, the YAG laser welding emission optical unit front / rear movement unit 46, and operates them in an optimum operation. The power detection adjustment control unit 47 and the overall control unit 49 are configured.
[0022]
FIG. 4 is a process flow diagram of the overall operation of the optical fiber assembling apparatus shown in FIG. 1 and the optical axis adjusting method according to the present invention.
First, the package 16, the isolator module 17, and the optical fiber 14 are manually supplied to the assembly apparatus (S200). Next, when the automatic start switch on the operation panel 1 is turned on (S201), the package 16, the isolator module 17, and the light set on the optical axis adjustment stage 6, the isolator adjustment stage 7, and the optical fiber adjustment stage 5, respectively. The fiber 14 is automatically conveyed and is initially positioned at a preset position (S202).
[0023]
Next, the mounting height of the isolator module 17 is measured in order to correct the YAG laser welding height (S203), and the welding surfaces of the package 16 and the isolator module 17 are aligned (S204). After completion of the surface alignment, the optical axis adjustment stage 6 is rotated by θ to align the polarization planes of the package 16 and the isolator module 17 (S205). Next, image detection of the light beam by the fiber bundle 20 is performed to correct in the XYZ directions. Then, the coordinate data is corrected (S206).
[0024]
Next, in order to correct the YAG laser welding height, the mounting height of the optical fiber 14 is measured (S207), and the optical fiber is positioned to the position of the XYZ coordinates (on the optical axis) recognized by the image detection ( S208). Next, the optical fiber 14 is adjusted in the XYZ directions and the package 16 is adjusted in the XY directions, and the adjustment is repeated until the position where the optical output is maximized (S209).
[0025]
After completion of the optical axis adjustment, the isolator module 17 and the package 16 are fixed by welding with a YAG laser (S210). Next, the welded surfaces of the isolator module 17 and the fiber holder 19 are aligned (S211), and then the optical fiber 14 is adjusted in the XYZ directions, and the adjustment is repeated until the position where the optical output is maximized (S212). After completion of the optical axis adjustment, the optical fiber 14 and the fiber holder 19 are welded and fixed with a YAG laser (S213). Next, the welding surfaces of the isolator module 17 and the fiber holder 19 are aligned again (S214), and then the fiber 14 is adjusted in the XY direction, and the adjustment is repeated until the position where the optical output is maximized (S215). After completion of the optical axis adjustment, the fiber holder 19 and the isolator module 17 are fixed by welding with a YAG laser (S216). The optical element module 21 completed through the above steps is transported to the take-out place by the optical axis adjustment stage 6 (S217), and the completed product is manually removed (S218), thereby completing a series of assembly operations of the optical element module.
[0026]
The optical fiber optical axis adjusting method in a series of assembly of the optical element module will be specifically described below.
FIG. 5A is a diagram for explaining a surface matching operation for completely bringing a part where the isolator module 17 and the package 16 are fixed by welding into close contact with each other. In FIG. 5A, by driving the isolator adjustment stage 7 (not shown), the lower end of the isolator module 17 is lowered to a position where it contacts the upper end of the package 16, and the isolator adjustment stage 7 is further driven from that position. As a result, the isolator module 17 is lowered in the Z direction and the lower end surface of the isolator module 17 is pressed against the upper end surface of the package 16, so that the angle of the optical axis adjustment stage 6 changes slightly, and the lower end surface of the isolator module 17 The upper end surface of the package 16 is in a completely parallel state, and the surface aligning operation of the isolator module 17 and the package 16 is completed.
[0027]
FIG. 5B is a diagram for explaining the polarization plane matching operation of the package 16 and the isolator module 17. After the surface alignment operation is finished, as shown in FIG. 5B, the fiber bundle positioning mechanism 5 (not shown) is driven, and the light detector 50 is moved immediately above the isolator module 17, and the package 16 Is energized to emit laser light from the upper end of the package 16. The laser beam emitted from the package 16 passes through the isolator module 17 and then enters the photodetector 50. Next, the optical axis adjustment stage 6 is rotated in the θ direction, and the optical axis adjustment stage 6 is stopped at a position where the laser output incident on the photodetector 50 is maximized.
[0028]
FIG. 5C is a diagram for explaining a light beam image detection operation by the fiber bundle 20. In FIG. 5C, the fiber bundle positioning mechanism (not shown) is driven to position the fiber bundle 20 directly above the isolator module 17. Next, while photographing the other end of the fiber bundle 20 with the infrared imaging tube camera 3 (not shown), the fiber bundle positioning mechanism 5 (not shown) is driven in the X and Y directions so that the laser beam is centered in the fiber bundle 20. The fiber bundle 20 is stopped at the position where it enters the beam. While lowering the fiber bundle 20 from this position in the Z direction, the movement of the fiber bundle 20 is stopped at a position where the area of the image of the laser light imaged by the infrared imaging tube camera is minimized. Since the area of the image of the laser beam is minimized when the end face of the fiber bundle 20 is located at the position where the laser beam emitted from the isolator module 17 converges, by obtaining the position where the detection area is minimized, Position data where the laser beam converges can be obtained.
[0029]
FIG. 6A is a diagram for explaining an optical axis adjustment operation for adjusting the positional relationship between the package 16 and the isolator module 17 to an optimum one. As shown in FIG. 6A, the optical fiber adjustment stage 8 (not shown) is driven to move the optical fiber 14 and the fiber holder 19 directly above the isolator module 17. At this time, the tip of the optical fiber 14 is positioned using the data of the position where the laser beam obtained in FIG. From this state, while finely moving the optical fiber 14 in the XYZ directions, the position where the light output measured by the light output measuring device 33 (not shown) connected to the other end of the optical fiber 14 is maximized is obtained. The optical fiber 14 is stopped at the position. Next, the optical axis adjustment stage 6 is slightly moved in the XY directions, and the positional relationship between the package 16 and the isolator module 17 is changed to finely adjust the incident angle when the laser light is incident on the optical fiber 14. The light output is measured by the output measuring device 33, and the package 16 is stopped at the position where the light output is maximized.
[0030]
Next, as shown in FIG. 6B, a YAG laser welding / emission optical unit positioning mechanism (not shown) is driven to lower the three YAG laser welding / emission optical units 2, and the package 16 and isolator module 17 The joint surface is fixed by welding at three points. Thereafter, the isolator gripping mechanism 39 is opened, and multi-point welding of the joint surfaces of the package 16 and the isolator module 17 is performed while rotating the optical axis adjustment stage 6 in the θ direction. After the welding is completed, an isolator adjustment stage (not shown) is driven to retract the isolator gripping mechanism 39 in the right direction.
[0031]
Next, as shown in FIG. 6C, a surface matching operation is performed to bring a lower surface of the fiber holder 19 and an upper surface of the isolator module 17 into close contact with each other. In FIG. 6C, by driving an optical fiber adjustment stage (not shown), the optical fiber 14 and the fiber holder 19 are lowered in the Z direction, and the lower end surface of the fiber holder 19 becomes the upper end surface of the isolator module 17. By pressing, the angle of the optical axis adjustment stage 6 changes minutely, the lower end surface of the fiber holder 19 and the upper end surface of the isolator module 17 become completely parallel, and the surface alignment operation of the fiber holder 19 and the isolator module 17 is performed. Complete.
[0032]
After completion of the surface alignment, as shown in FIG. 7A, the optical fiber adjustment stage (not shown) is moved again in the XYZ directions, and the optical fiber 14 is measured by the light output measuring device 33 (not shown). The optical fiber 14 is positioned at a position where the light output is maximized.
[0033]
Next, as shown in FIG. 7B, the YAG laser welding / emission optical unit positioning mechanisms 45 and 46 (not shown) are driven to move the three YAG laser welding / emission optical units 2, and the optical fiber 14 and The fiber holder 19 is fixed by welding.
Thereafter, the fiber holder 19 and the isolator module 17 are aligned again in the above procedure, and then the fiber holder 19 is finely moved in the XY directions so that the optical output is maximized as shown in FIG. The fiber holder 19 is positioned.
[0034]
Next, the fiber holder 19 and the isolator module 17 are fixed by welding.
[0035]
As shown in FIG. 8B, the YAG laser welding / emission optical unit positioning mechanisms 45 and 46 (not shown) are driven to move the YAG laser welding / emission optical unit 2 at three locations, and the fiber holder 19 and the isolator module. 17 joint surfaces are fixed by welding at three points. Next, the fiber holder gripping mechanism 42 and the optical fiber gripping mechanism 44 are opened, and multi-point welding of the joint surfaces of the fiber holder 19 and the isolator module 17 is performed while rotating the optical axis adjustment stage 6 in the θ direction.
The optical element module 21 is completed by the above procedure.
[0036]
FIG. 9 shows an assembly position adjusting unit for the second lens 13 and the optical fiber 14 in still another embodiment of the optical device module assembling apparatus according to the present invention. In this embodiment, a light receiving plate for visualizing the focused laser beam is used instead of the fiber bundle which is a means for obtaining the image of the light beam at a remote place in the embodiment shown in FIG. . The other optical fiber adjustment stage, optical axis adjustment stage, and the like are the same as those shown in FIG. In FIG. 11, 90 is an alternative light source having the same wavelength as that of the LD 10, 91 is a light receiving plate for visualizing the laser light collected by the second lens 13, and 92 is a collection of laser light visualized by the light receiving plate 91. It is a camera that recognizes the light state, and includes a motor 93 that moves the position of the light receiving plate 91 according to the condensing state of the laser light recognized by the camera 92 and a control device 94 that controls the motor 93.
[0037]
The divergent light of the alternative light source 90 is visualized by the light receiving plate 91 via the second lens 13 and has a minimum spot diameter at the focal position. Therefore, the spot diameter on the surface of the light receiving plate 91 is recognized by the camera 92 and the minimum spot diameter is obtained. By detecting the position position data (hereinafter referred to as WD) by moving the light receiving plate 91 in the front-rear direction with respect to the laser beam by the motor 93, it is possible to grasp in advance the focal position variation unique to the second lens 13. To do. In the position adjustment between the second lens 13 and the optical fiber 14, by setting the interval between the second lens 13 and the optical fiber 14 to WD, the focal position variation inherent to the second lens 13 can be absorbed. Position adjustment time can be shortened.
[0038]
【The invention's effect】
As described above, according to the present invention, in the assembly of an optical element module including an LD including a package, a converging lens, and an optical fiber, the convergence position of the laser beam by the converging lens is determined from the optical axis of the optical element module. Since an optical image is taken at a distant position and the subsequent optical axis alignment is performed using the position data, the optical axis adjustment of the optical fiber can be performed with high accuracy and in a short time.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of an optical device module assembling apparatus according to the present invention.
FIG. 2 is a side view showing the main configuration of FIG.
FIG. 3 is a diagram illustrating the structure of an optical element module applied to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating assembly of an optical element module according to the embodiment of FIG.
FIG. 5 is a diagram illustrating a process of an embodiment of an optical fiber optical axis adjustment method according to the present invention.
FIG. 6 is a diagram illustrating a process of an embodiment of an optical fiber optical axis adjusting method according to the present invention.
FIG. 7 is a diagram illustrating a process of an embodiment of an optical fiber optical axis adjustment method according to the present invention.
FIG. 8 is a diagram illustrating a process of an embodiment of an optical fiber optical axis adjustment method according to the present invention.
FIG. 9 is a diagram showing a configuration of a part of still another embodiment of the optical device module assembling apparatus according to the present invention.
[Explanation of symbols]
1 …… Operation panel, 2 …… YAG laser welding optical section,
3 ... Infrared tube camera, 4 ... YAG laser oscillator,
5 ... Fiber bundle positioning mechanism, 6 ... Optical axis adjustment stage,
7 …… Isolator adjustment stage, 8 …… Optical fiber adjustment stage,
10 …… Laser diode (LD), 11 …… First lens,
12 ... Isolator, 13 ... Second lens, 14 ... Optical fiber,
15 ... stem, 16 ... package, 18 ... lens holder,
19 ... Fiber holder, 20 ... Fiber bundle, 21 ... Optical element module,
30 …… Base, 31 …… Optical axis adjustment XYθ moving part, 32 …… Package fixing mechanism,
33 …… Power meter, 34 …… Fiber bundle XY moving part,
35 …… Fiber bundle vertical movement part, 36 …… Fiber bundle gripping mechanism,
37 …… Isolator XY moving part, 38 …… Isolator vertical moving part,
39 …… Isolator gripping mechanism,
40 …… Optical fiber, fiber holder XY moving portion 41 …… second lens up / down moving portion, 42 …… fiber holder gripping mechanism,
43: Optical fiber vertical movement part, 44: Optical fiber gripping mechanism,
45..YAG laser welding emission optical part vertical movement part,
46 …… YAG laser welding emission optics back and forth moving part,
47 …… Power detection adjustment control unit, 48 …… Camera imaging detection adjustment control unit,
49... Overall control unit 50... Light detector 90. Alternative light source
91 …… Light receiving plate, 92 …… Camera, 93 …… Motor, 94 …… Control device

Claims (5)

A package including a first lens and a laser diode (hereinafter abbreviated as LD) and an optical fiber;
An isolator module including a second lens and an isolator ;
An optical element module comprising the optical element module comprising :
The laser beam from the LD is parallel to the package, and the surface is aligned by pressing the lower end surface of the isolator module against the upper end surface of the package.
Optical axis adjustment of the optical fiber for optical axis adjustment between the optical fiber and the second lens, the image output of the output beam of the second lens in the vicinity of the optical axis of the LD and the second lens Imaging means that obtains the image at a position away from the optical axis while changing the position of the image, a processing device that calculates position data from the image obtained by the imaging means, and positioning of the optical fiber using the position data. An apparatus for assembling an optical element module, comprising: positioning means for performing and optical output measuring equipment for measuring the output of the optical fiber when adjusting the output of the positioning means. 2. The optical device module assembling apparatus according to claim 1, wherein said imaging means moves a fiber bundle for transmitting an optical image and one end of said fiber bundle in the vicinity of the optical axis of said second lens and stops at an arbitrary position. An assembly device for an optical element module, comprising: a moving mechanism; and an image display device that captures an image transmitted to the other end of the fiber bundle. 2. The optical element module assembling apparatus according to claim 1, wherein the imaging means visualizes a laser beam condensed by the second lens, an imaging means for imaging an image of the light receiving board, and the imaging means. And a control device that moves the position of the light receiving plate in conjunction with the optical device module. A package including a first lens and a laser diode (hereinafter abbreviated as LD) and an optical fiber;
An isolator module including a second lens and an isolator ;
In a method of assembling and manufacturing an optical element module comprising :
The laser beam from the LD is parallel to the package, and the surface is aligned by pressing the lower end surface of the isolator module against the upper end surface of the package.
The LD is in a light emitting state, and the image of the light beam is observed at a position away from the image position while changing the position of the image of the light beam emitted from the lens,
Detect position data when the light beam converges,
An optical fiber optical axis adjustment method comprising the step of controlling the position of an optical fiber gripping device for assembling the optical lens and optical fiber using the position data 5. The method of adjusting an optical axis of an optical fiber according to claim 4, wherein the step of observing the image of the light beam at a position away from the image position while changing the position of the image of the light beam emitted from the second lens. An optical fiber optical axis adjustment method, wherein one end of a fiber bundle is moved in the vicinity of a position where the light beam converges, and an image of the light beam is observed at the other end of the optical fiber bundle.

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