JP4405943B2 - Optical connector end face processing method, optical fiber cutting device, and optical connector end face processing apparatus - Google Patents

Description

The present invention relates to an optical connector end surface processing method, an optical fiber cutting device, and an optical connector end surface processing device for processing an end surface of an optical connector.

  In manufacturing an optical connector including an optical fiber and a ferrule that accommodates the optical fiber, it is necessary to perform end surface processing such as polishing of the end surface.

FIG. 4 is a diagram for explaining a conventional optical connector end surface polishing process.
First, as shown in FIG. 4A, the optical fiber 101 is fixed in the ferrule 102 mainly by an epoxy-based adhesive and a thermosetting process with its tip protruding from the end face of the ferrule 102. . At this time, a certain amount of adhesive 103 is also applied to the end face of the ferrule 102.

  Next, as shown in FIG. 4B, the protruding portion of the optical fiber 101 is manually opened near the adhesive 103 (b). At this time, the tip of the optical fiber 101 protrudes from the layer of the adhesive 103 by about 0.1 mm due to the nature of work.

  Next, as shown in FIG. 4C, the end face of the optical fiber 101 and the end face of the ferrule 102 are processed to be the same.

In the following description, the steps shown in FIGS. 4A to 4C are referred to as “first step”.
The adhesive 103 applied to the end face in the first step exhibits the following effects.
In this step, a polishing film having a relatively large particle size is usually used in order to realize a large processing amount in a short time. However, at the initial stage of processing, the protruding optical fiber 101 is intensively stressed and the adhesive 103 Fold inside the layer (adhesive layer). However, since the adhesive layer exists, the folded portion does not reach the end face of the ferrule 102, and the folded portion itself can be easily removed by removing the adhesive layer. That is, the adhesive layer functions as a protective material for the optical fiber being processed.

  When the first step is completed, as shown in FIG. 4D, the end surfaces of the optical fiber 101 and the ferrule 102 are processed into a convex spherical shape. In the following description, this process is referred to as “rough machining process” or “second process”.

  Then, a finishing process (third process) is performed to secure the return loss and suppress the drawing of the optical fiber 101.

  The processed optical connector end face is required to have a high accuracy with a radius of curvature of 10 to 25 mm, a deviation between the convex spherical vertex and the center of the optical fiber of 50 μm or less, and an optical fiber pull-in from 0.05 to −0.1 μm. The

  For this reason, in the second step, in order to process into a desired convex spherical surface, for example, with a relatively large ferrule such as the SC type, it is necessary to realize a relatively large scale processing with good reproducibility.

  In the first step, the end face of the optical fiber 101 is almost the same as the end face of the ferrule 102, which is important for obtaining good reproducibility without damaging the polishing film (usually diamond abrasive grains) that is an abrasive. It becomes.

  Further, when the adhesive 103 is applied to the end surface of the ferrule 102, the end surface of the ferrule 102 itself is relatively small with a diameter of about 2 mm, and the shape after the application of the adhesive 103 is symmetrical with respect to the optical fiber 101. It needs to be good, constant, and difficult.

In the above step, an adhesive is used, but there is a method not using this. The details are shown below.
This method is used when it is necessary to avoid the end face application of the adhesive, which is relatively difficult, or when the viscosity is low such as an adhesive other than an epoxy type, for example, a cyanoacrylate type, and can protect an optical fiber. Used when it cannot be applied.

The processing method in this case is shown in FIG.
First, as shown in FIG. 5A, the optical fiber 101 is fixed in the ferrule 102 with an adhesive.

Next, as shown in FIG. 5 (b), the optical fiber 101 is opened near the ferrule 102 and polished as a first step as shown in FIG. 5 (c). In this step, relatively rough abrasive grains such as alumina and SIC are used, and processing is performed in a short time and at a high speed. Further, the optical fiber 101 receives a strong shearing force, and the optical fiber may be bent into the ferrule 102 as indicated by 104 in the figure.

  Next, as shown in FIG. 5D, as the second step, a convex spherical surface is formed with diamond or the like.

  In this step, in order to obtain a mirror surface having no distortion in the next finishing process, it is necessary to completely remove the folded portion generated in the first step with little damage. The processing amount may be about 20 to 50 μm.

  Next, as a third step, a finishing process is performed with silica-based abrasive grains, and mirroring is performed while preventing processing damage.

  In this step, silica-based abrasive grains are generally used in order to keep the level difference between the ferrule 102 and the optical fiber 101 small, but the processing amount is small.

  Although the above-described method of not applying the adhesive does not require an application operation, the amount of processing in the second step increases.

  However, since the application of the adhesive requires skill, the advantage of not requiring the application work is great.

In addition, the cutting after the adhesive fixing is visually performed using a man-made ruby knife or the like from the viewpoint of the convenience of operation and the apparatus cost, and it is difficult to perform the cutting precisely.
JP-A-6-15556 JP-A-6-27330 JP 2004-167675 A

  In view of the above circumstances, an object of the present invention is to provide an optical connector end surface processing method, an optical fiber cutting device, and an optical connector end surface processing device that can perform processing simply and accurately.

The present invention according to claim 1 is an optical connector end face processing method for processing an end face of an optical connector comprising an optical fiber and a ferrule that accommodates the optical fiber, and the ferrule of the optical fiber is accommodated in the ferrule. After the optical fiber and the ferrule are bonded without applying an adhesive to the portion protruding from the end surface of the optical fiber, the protruding portion of the optical fiber is cut so that the optical fiber does not protrude from the ferrule, and then the end surface of the optical fiber and ferrule The first step of removing the bent portion of the optical fiber generated at the time of cutting, and polishing the end surface of the optical fiber, and removing the work-affected layer generated at this time a second step of possess,
The step of cutting the protruding portion of the optical fiber in the first step is such that a part of the end surface of the ferrule is perpendicular to the upper surface of the block-shaped shearing means having a right-angled portion. A portion of the outer peripheral surface of the protruding portion of the optical fiber is brought into contact with the side surface of the shearing means, and the end surface of the ferrule is slid along the upper surface of the shearing means. After cutting the protruding portion of the optical fiber after the cutting by pressing the end face of the ferrule against the upper surface of the shearing means and sliding along the upper surface of the shearing means further have the step of worn the projecting portion of the remaining said fiber is summarized as.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to process the end surface of an optical connector simply and correctly, without depending on a worker's skill.

Hereinafter, an optical connector end surface processing method, an optical fiber cutting device, and an optical connector end surface processing device of the present invention will be described with reference to the drawings.
The following examples are only for the purpose of explaining the present invention and do not limit the scope of the present invention. Accordingly, those skilled in the art can employ various embodiments including each or all of these elements, and these embodiments are also included in the scope of the present invention.
In all the drawings for explaining the embodiments, the same elements are given the same reference numerals, and the repeated explanation thereof is omitted.

  Examples of the present invention will be described below. In this embodiment, a ferrule having a diameter of 2.5 mm or 1.25 mm is targeted. However, the present invention is not limited to this, and can be applied to ferrules having various shapes and diameters.

  In the present invention, the number of steps of the end face processing is reduced from 3 to 2, thereby simplifying the work.

  When the third step that needs to prevent damage in processing and the second step that forms a curved surface on the end face and the removal of the bent portion of the optical fiber are a single step, a damage-free processed surface can be obtained. It becomes very difficult to get. Therefore, in this invention, said 1st process and 2nd process are unified.

  In this case, there is a problem of how to properly remove the folded portion of the optical fiber. Usually, after bonding and opening the optical fiber, the optical fiber protrudes from the end face of the ferrule by about 100 μm. Therefore, it is necessary to make the end face of the optical fiber the same as the end face of the ferrule by the first step (described later) of the present invention. If this is neglected, the optical fiber protruding in the second step (described later) of the present invention may peel off the diamond abrasive layer on the polishing film surface.

  The amount of peeling varies depending on the degree of processing and the like, and cannot be controlled. For this reason, the amount of processing is significantly reduced by the occurrence of peeling. In particular, when the ferrule end face is processed while passing the same portion of the polishing film a plurality of times as in a small polishing machine, peeling of the abrasive layer results in a significant reduction in the processing amount of this process itself.

  In addition, since the amount of separation is not constant as described above, the amount of processing per process varies, so that not only the amount of processing by this step is reduced, but also the amount of processing per time cannot be adjusted.

  The end face of the zirconia ferrule, which is originally difficult to cut, requires a certain amount of time to process even when diamond abrasive grains are used. The prolongation of the machining time and the difficulty of controlling the machining amount are serious problems.

  Therefore, in the present invention, processing is performed without projecting the optical fiber from the ferrule end face at the stage of opening the wall of the optical fiber.

  The difficulty of preventing the optical fiber from projecting when the wall is opened is almost the same as the case of projecting about 100 μm even when the wall is opened using a normal ruby knife.

  However, in such a case, a relatively large fold occurs. The amount of folding is about 10 to 20 μm larger than the case where the optical fiber is projected. For this reason, the processing amount with a diamond film increases.

  However, speeding up of the processing can be realized relatively easily by increasing the driving speed of the polishing plate, and if the method of the present invention is used, the abrasive layer does not peel off and no adhesive is used. End surface processing can be performed simply, quickly and accurately without depending on the skill level of the operator.

Hereinafter, the details of the above method will be described with reference to FIG.
FIG. 1A shows a state where the optical fiber 2 and the ferrule 3 are bonded.

  FIG. 1B shows a state where the optical fiber 2 is cut so as not to protrude from the end face of the ferrule 3, and it can be seen that the optical fiber 2 is folded into the ferrule 3.

  FIG. 1C shows a state in which the end faces of the optical fiber 2 and the ferrule 3 are processed into a convex spherical shape and the folds are removed.

  In addition, the 1st process of this invention points out the process shown to said FIG. 1 (a) to (c).

  FIG. 1 (d) is a diagram showing a state in which the optical fiber 2 is mirror-finished and the process-affected layer is removed, and the process is completed. In addition, the 2nd process of this invention points out this process.

  Further, in the present invention, in order to further improve the convenience of work, when cutting the optical fiber 2 as shown in FIGS. 1A and 1B, the optical fiber cutting as shown in FIG. Device 4 is used.

When cutting the optical fiber 2, as shown in FIG. 2 (a), the upper surface of the block-shaped cutting portion 5 having a portion the right-angle side of the tip of the ferrule 3, the long axis of the ferrule is substantially perpendicular pressed manner, as shown in FIG. 2 (b), is parallel to slide along the top of the cutting unit 5. As a result, a shearing force acts on the optical fiber 2 protruding from the ferrule 3 and is completely cut.

  At this time, since the ferrule 3 is pressed against the upper surface of the cutting portion 5 as described above, the optical fiber 2 is cut without protruding from the ferrule 3.

  Even if the optical fiber 2 slightly protrudes from the end face of the ferrule 3, it is slid on the upper surface of the cutting portion 5 by the above-described sliding operation. For this reason, the protruding portion is worn away, and the optical fiber 2 does not protrude from the end face of the ferrule 3 in the end.

  Further, even if the end surface of the ferrule 3 is damaged at this time, this surface is processed later, so that there is no problem.

  If a material softer than zirconia, which is the material of the ferrule 3, or quartz, which is the material of the optical fiber, is used as the material of the cut portion 5, the end surface of the ferrule 3 is less likely to be scratched and elastic deformation of the cut portion 5 is achieved. Thus, the sliding operation between the end portion of the ferrule 3 and the upper surface of the cutting portion 5 can be performed reliably.

  Furthermore, when sliding, the amount of folding of the optical fiber 2 into the ferrule 3 can also be suppressed.

  The cut optical fiber (cut piece) 2 is collected by a cut piece collection unit 6 provided adjacent to the cut unit 5.

  Note that a cutting function can be imparted to the polishing apparatus without using the apparatus as described above.

The details will be described with reference to FIG.

  In this case, the optical fiber 2 is protruded from the ferrule 3 by about 1 mm in advance, and this optical connector is attached to the holding portion 7.

  The holding unit 7 is attached to the polishing apparatus main body, a processing load is applied to the optical connector 1, the ferrule 3 is brought into contact with the rotating polishing platen 9, and the ferrule 3 is moved relative to the polishing platen 9. However, it is mounted on the polishing apparatus main body so that the distance between the two becomes gradually smaller.

  In realizing the above configuration, in this embodiment, as shown in FIG. 3A, the holding portion 7 and the polishing apparatus body 8 are provided with thread grooves, and the holding portion 7 is pressurized (including rotational movement). As a result, the structure is gradually inserted into the polishing apparatus main body 8.

  Further, as shown in FIG. 3B, the shape of the holding portion 7 is determined so that the rotation center of the holding portion 7 and the center of the ferrule are different. For this reason, the locus of the optical connector 1 (ferrule 3) on the polishing surface plate 9 is as shown in FIG.

  With the above configuration, the optical fiber 2 is processed by the polishing surface plate 9 while taking the locus as described above, so that the optical fiber 2 finally does not protrude from the ferrule 3.

  At this time, the relative speed between the end face of the ferrule 3 and the polishing surface plate 9 is significantly slower than the speed in the actual processing step, and the diamond abrasive layer of the polishing surface plate 9 does not peel off.

  As described above, according to the present invention, it is possible to easily, quickly and accurately perform end face processing without peeling off the abrasive layer and without depending on the degree of training of the operator because no adhesive is used. it can.

It is a figure for demonstrating the end surface processing method of this invention. It is a block diagram of the optical fiber cutting device of this invention. It is a block diagram of the grinding | polishing apparatus of this invention. It is a figure for demonstrating the conventional end surface grinding | polishing process. It is a figure for demonstrating the conventional end surface grinding | polishing process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical connector 2 Optical fiber 3 Ferrule 4 Optical fiber cutting device 5 Cutting part 6 Cut piece collection | recovery part 7 Holding part 8 Polishing apparatus main body 9 Polishing surface plate 101 Optical fiber 102 Ferrule 103 Adhesive

Claims (1)

An optical connector end face processing method for processing an end face of an optical connector comprising an optical fiber and a ferrule that accommodates the optical fiber,
The optical fiber is accommodated in the ferrule, and the protruding portion of the optical fiber is cut after bonding the optical fiber and the ferrule without applying an adhesive to the protruding portion of the optical fiber from the end surface of the ferrule. Then, after the optical fiber does not protrude from the ferrule, the end surfaces of the optical fiber and the ferrule are polished and processed into a convex spherical shape, and the bent portion of the optical fiber generated during the cutting is removed. A first step;
The end face of the optical fiber is mirror-, have a second step of removing the damaged layer produced at this time,
The step of cutting the protruding portion of the optical fiber in the first step is such that a part of the end surface of the ferrule is perpendicular to the upper surface of the block-shaped shearing means having a right-angled portion. A portion of the outer peripheral surface of the protruding portion of the optical fiber is brought into contact with the side surface of the shearing means, and the end surface of the ferrule is slid along the upper surface of the shearing means. Is a process of shearing,
After the step of cutting the protruding portion of the optical fiber, the protrusion of the optical fiber remaining after the cutting is made by pressing the end face of the ferrule against the upper surface of the shearing means and sliding it along the upper surface of the shearing means. the optical connector end face machining method characterized by further have the step of worn parts.

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