JP5113344B2 - Optical fiber holder and method of using the same - Google Patents

Description

  The present invention relates to an optical fiber core wire fusion splicing method, an optical fiber holder, and a method of using the optical fiber holder, and an optical fiber core wire having a plurality of coating layers mainly having a coating outer diameter larger than φ0.25 mm. The present invention relates to an optical fiber core wire batch fusion splicing method that is effective for fusion splicing a plurality of optical fibers simultaneously, an optical fiber holder, and a method of using the optical fiber holder.

  2. Description of the Related Art Conventionally, an optical fiber holder is used in an optical fiber fusion splicing device that heats and welds both end faces of optical fibers to be connected when the optical fibers are fusion spliced.

  Referring to FIGS. 10A and 10B, a conventional optical fiber holder 101 has a single base 105 for placing, for example, an optical fiber ribbon 103 as a multi-core optical fiber to be fused and connected. In addition, one or a plurality of lids 107 for pressing and fixing the optical fiber ribbon 103 placed on the base 105 are pivotally supported on the base 105 by a support shaft 109. A rubber pad 111 for holding the optical fiber ribbon 103 is provided on the lower surface of the lid 107.

  After the optical fiber tape core 103 is placed on the base 105, the optical fiber tape core 103 is held by the rubber pad 111 and the base 105 by closing the lid 107. Further, a magnet (not shown) is embedded in the base 105, and the lid 107 can be attracted and held by this magnet.

  When connecting the optical fiber strands of the optical fiber ribbon 103 with a multi-fiber optical fiber fusion splicer (not shown), the optical fiber ribbon 103 is first held by the optical fiber holder 101 and then a dedicated coating (not shown) After the coating of the optical fiber ribbon 103 is removed with a removal tool to form a plurality of optical fibers, the bare optical fibers 113 of the optical fibers are exposed.

  Thereafter, each bare optical fiber 113 is cut to a predetermined length by using a cleaver (not shown) for cutting the bare optical fiber 113. After this cutting, the optical fiber holder 101 holding the optical fiber ribbon 103 is set as it is on both sides of the multi-fiber fusion splicer. At this time, it sets so that the front-end | tip of the bare optical fiber 113 of each optical fiber strand of the optical fiber tape core wire 103 hold | maintained at each said optical fiber holder 101 set on both sides may be matched and matched mutually. .

  Furthermore, the multi-core optical fiber fusion splicing device is provided with V-grooves in which the bare optical fibers 113 exposed by removing the coating are aligned and arranged at regular intervals. Accordingly, when the optical fiber holder 101 holding the optical fiber ribbon 103 is set in the multi-fiber fusion splicer, each bare optical fiber 113 is set in each V-groove and aligned and held at a constant interval. It has a structure. Thereafter, the plurality of bare optical fibers 113 are held by the V-groove and the optical fiber clamp, and the ends of the bare optical fibers 113 that are abutted with each other are fusion spliced.

The above-described method is generally widely used when fusion-connecting multi-core optical fibers, for example, as shown in Patent Document 1.
JP 2000-292639 A

  By the way, a conventional multi-core optical fiber, for example, each optical fiber constituting an optical fiber core, is coated with an ultraviolet curable resin on a bare optical fiber having an outer diameter of φ0.125 mm, and the outer diameter is about φ0. It is 25 mm. For this reason, the V-groove pitch of the optical fiber holder in the conventional multi-core optical fiber fusion splicing device is also arranged so as to be φ0.25 mm.

  However, recently, an optical fiber core wire suitable for special applications such as FTTH and having an outer diameter of, for example, φ0.5 mm has been developed.

  When a plurality of these new optical fiber cores are aligned and fused together with a multi-fiber fusion splicer, the optical fiber holder of the conventional multi-fiber fusion splicer cannot be used as it is. There's a problem.

  This is because when a plurality of the new optical fiber cores are fused together by a multi-fiber optical fiber fusion splicing device, the pitch (interval) of the optical fibers exposed at the tip of the optical fiber core group This is because the distance (pitch) between the V grooves of the conventional optical fiber holder is 0.25 mm.

  Therefore, the coating outer diameter of each optical fiber core is individually reduced from φ0.50 mm to φ0.25 mm, and the coating of each optical fiber strand reduced to φ0.25 mm is further removed. It is necessary to extract the exposed bare optical fiber 113 to φ0.125 mm.

  Therefore, the first optical fiber holder 115 used when removing the coating outer diameter of the optical fiber core from a large diameter, for example, from φ0.50 mm to φ0.25 mm, and the coating outer diameter φ0. The second optical fiber holder 101 used when the bare optical fiber 113 exposed by removing the coating from 25 mm is 0.125 mm is required. The two optical fiber holders 101 and 115 have the same structure.

  Each of the optical fiber strands from which the coating has been removed by the first optical fiber holder 115 is individually moved to set a plurality of light beams when set on the second optical fiber holder 101. There is a problem in that it takes time since the stripping of the fiber strand coating needs to be made uniform.

  The present invention has been made to solve the above-described problems.

An optical fiber holder according to the present invention includes a first base portion including a first groove portion on which a plurality of optical fiber core wires having a second coating outer diameter larger than the first coating outer diameter are placed in parallel. And a clamp portion having first and second clamps separately provided adjacent to each other in the longitudinal direction of the first groove portion to clamp the optical fiber core wire placed in the first groove portion. A first clamp having a clamp portion configured such that the first clamp holds the optical fiber core wire relatively weakly, and the second clamp holds the optical fiber core wire relatively strong. An optical fiber holder,
A plurality of optical fiber cores having a second outer sheath diameter, and a second groove portion having a first predetermined width parallel to the plurality of optical fiber core wires; and the plurality of optical fiber core wires communicated with the second groove portion. A third groove portion for collecting the portions removed from the second covering outer diameter to the first covering outer diameter, wherein the width is from the first predetermined width to the first covering outer diameter; A second base portion having a third groove portion that is tapered and reduced to a second predetermined width for accommodating a plurality of optical fiber strands, and the light placed from the second groove portion to the third groove portion. A second optical fiber holder having a third clamp that strongly holds the tip of the fiber strand;
Ri Na provided second optical fiber holder detachably attached to the first optical fiber holder, the upper surface of the first base portion, and a second magnet for attracting said second clamp is provided A third magnet for adsorbing the third clamp is provided on an upper surface of the second base portion; the second magnet and the third magnet include the first optical fiber holder and the first magnet; In order to attract the two optical fiber holders, the magnetic pole holders are configured with different magnetic poles .
In the optical fiber holder according to the present invention, a pair of positioning holes are provided on the attachment / detachment surface of the first base portion, and the attachment / detachment surface of the second base portion is inserted into and removed from the pair of positioning holes. It is preferable that a pair of positioning pins that can be projected.
In the optical fiber holder of the present invention, the third groove portion is provided on the upper surface of the second base portion, and a pair of tapered portions having inclined surfaces are slid toward the center of the third groove portion. Preferably it is formed.

  The optical fiber holder according to the present invention is the optical fiber holder, wherein the second base portion communicates with the third groove portion and extends to the front end of the second base portion with a second predetermined width. It is preferable to provide.

The method of using the optical fiber holder according to the present invention is the method of using the optical fiber holder according to any one of claims 1 to 4, wherein the first optical fiber holder is provided on the first base portion. An optical fiber core wire having a second coating layer having a second coating outer diameter to be connected to a gap formed by covering the first groove portion with a first clamp and composed of the first groove portion and the first clamp. In order to hold the tip of each optical fiber core wire weakly in a state of protruding from the first groove by a predetermined length, and further, a second coating layer having a second coating outer diameter is provided. The optical fiber core wire is strongly held by the second clamp, and the second coating layer at the tip of each optical fiber core wire is removed from the second coating outer diameter until the first coating outer diameter is reached. Exposed to one coating layer,
The second optical fiber holder is attached to the first optical fiber holder, and the second optical fiber holder includes a plurality of second covering outer diameters held by the first optical fiber holder. The tip of the optical fiber core having the second coating layer, the diameter of which is reduced from the second coating outer diameter to the first coating outer diameter, is the second of the first predetermined width provided on the second base portion. The first covering outer diameter portion is set to a second predetermined width by the third groove portion formed in a tapered shape and is placed in the groove portion, and the first covering outer diameter portion is set to the second portion. Each light projecting from the front end of the base portion by a predetermined length, holding each optical fiber placed on the third groove portion strongly by a third clamp, and projecting from the front end of the second base portion To remove the coating layer at the tip of the fiber strand and make it an exposed bare optical fiber Out, and is characterized in cutting the respective bare optical fibers this is lead-out to the same length.

  As will be understood from the means for solving the problems as described above, according to the batch fusion splicing method of the optical fiber core wire of the present invention, from the second coating outer diameter larger than the first coating outer diameter. A plurality of optical fiber cores having the second coating layer, which are exposed to the first coating layer by removing the coating from the second coating outer diameter to the first coating outer diameter; Since the tip portion of the first coating layer is removed and exposed to the exposed bare optical fiber, a plurality of optical fiber strands having the first coating layer having the first coating outer diameter are collectively connected. Using a conventional multi-core optical fiber fusion splicer, a plurality of optical fiber cores having a second coating layer having the second outer diameter can be easily melt-connected.

  According to the optical fiber holder of the present invention, the first optical fiber holder holds the plurality of optical fiber core wires having the second coating outer diameter larger than the first coating outer diameter relatively weakly. Since the clamp and the second clamp that holds the optical fiber core wire relatively strongly are provided, it is weak even if the optical fiber core wires having the second outer sheath diameter are set to the first clamp one by one. Therefore, a plurality of optical fiber cores can be easily and strongly held and fixed simultaneously by the second clamp, and in this fixed state, the second coating layer at the tip of each optical fiber core wire can be The first coating layer can be easily removed by removing from the coating outer diameter of 2 until the first coating outer diameter is reached.

  In addition, the second optical fiber holder is mounted so as to be integrated with the first optical fiber holder, and the first coating of a plurality of optical fiber strands held and fixed to the first optical fiber holder Since the portion of the first coating layer having the outer diameter is gathered by the tapered third groove portion of the second optical fiber holder and is strongly held and fixed by the third clamp, the light having the second outer diameter of the coating Without moving the fiber core wire, the tip of the first coating layer can be easily removed and led to the bare optical fiber as it is.

  Therefore, using a conventional multi-fiber fusion splicer, light having a second coating layer having a second coating outer diameter larger than the first coating outer diameter in one optical fiber holder A plurality of fiber cores can be fusion spliced simultaneously.

  According to the optical fiber holder of the present invention, the first clamp for relatively weakly holding a plurality of optical fiber cores having a second coating outer diameter larger than the first coating outer diameter, and the light Since the second clamp that holds the fiber core wire relatively strongly is provided, even if one optical fiber core wire having the second outer sheath diameter is set to the first clamp one by one, it is held with a weak force. Therefore, a plurality of optical fiber cores can be easily and strongly held and fixed simultaneously by the second clamp, and in this fixed state, the second coating layer at the tip of each optical fiber core wire is made the second coating outer diameter. The first coating layer can be easily removed by removing until the first coating outer diameter is reached.

  Further, according to the optical fiber holder of the present invention, the plurality of optical fiber cores having the second coating layer having the second coating outer diameter larger than the first coating outer diameter is provided by the second coating. Since the portion of the first coating layer reduced in diameter from the outer diameter to the first coating outer diameter is gathered by the tapered third groove portion and is strongly held and fixed by the third clamp, the second coating outer diameter It is possible to easily remove the tip portion of the first coating layer and to expose the bare optical fiber without moving the optical fiber core wire having the optical fiber.

  According to the method of using the optical fiber holder of the present invention, the optical fiber holder is the same as that described in the effect of the optical fiber holder according to the fourth aspect. With the fiber holder, a plurality of optical fiber cores having a second coating layer having a second coating outer diameter larger than the first coating outer diameter can be fused and connected simultaneously.

  According to the method of using the optical fiber holder of the present invention, the light having the second coating outer diameter larger than the first coating outer diameter is the same as described in the effect of the optical fiber holder according to claim 5. An optical fiber having a second coated outer diameter because it includes a first clamp that holds a plurality of fiber cores relatively weakly and a second clamp that holds the optical fiber cores relatively strongly Even if the cores are set to the first clamp one by one, they are held with a weak force. Therefore, a plurality of optical fiber cores can be easily and strongly held and fixed simultaneously with the second clamp. The second coating layer at the tip of the optical fiber core wire can be removed from the second coating outer diameter until the first coating outer diameter is reached, and can be easily exposed to the first coating layer.

  According to the method of using the optical fiber holder of the present invention, it is the same as described in the effect of the optical fiber holder according to the sixth aspect, and the second covering outer diameter larger than the first covering outer diameter. A plurality of optical fiber cores having two coating layers are formed by forming a portion of the first coating layer reduced from the second coating outer diameter to the first coating outer diameter with a tapered third groove portion. Since they are assembled and strongly held and fixed by the third clamp, the tip of the first coating layer can be easily removed without moving the optical fiber core having the second outer diameter. Can be exposed to bare optical fiber exposed.

  Embodiments of the present invention will be described below with reference to the drawings.

  The optical fiber holder according to this embodiment is used in an optical fiber fusion splicing device that heats and welds both end surfaces of bare optical fibers to be connected when connecting optical fiber core wires. ing.

  Referring to FIGS. 9A and 9B, the optical fiber fusion splicing device 1 includes a plurality of pairs of optical fiber cores 3 that are coated and removed, and the ends of the bare optical fibers 5 that are led out are mutually connected. A butt portion 13 having an optical fiber clamp 11 composed of a plurality of butt V grooves 7 and clamps 9 to be positioned for butt, and a plurality of pairs are formed on both sides of the butt portion 13. Optical fiber holders 15 for positioning and gripping the optical fiber core wires 3 are provided on both the left and right sides in FIG.

  In this embodiment, the optical fiber core wire 3 is used, and the distal end side of the optical fiber core wire 3 is exposed with the coating removed, and the bare optical fiber 5 is exposed.

  The abutting portion 13 is a substantially rectangular block, and a horizontal groove 17 is provided in the width direction (vertical direction in FIG. 9A) at the center of the block in FIG. 9A in the left-right direction. ing.

  Further, as shown in FIG. 9 (B), the optical fiber clamp 11 is formed on the block upper surface on both sides of the lateral groove 17 in the front-rear direction [left-right direction in FIG. A plurality of abutting V-grooves 7 provided for positioning the optical fiber and a clamp 9 for pressing and fixing the bare optical fiber 5 placed in each of the abutting V-grooves 7. . The centers of the V grooves 7 facing each other on the upper surface of the blocks on both sides are arranged in a straight line.

  9A of the horizontal groove 17 is provided with a discharge electrode 19 as an optical fiber melting means for fusing and connecting the bare optical fibers 5 which are butted against each other at the butting portion 13. It has been.

  1 and 3 together, the optical fiber holder 15 according to the embodiment of the present invention is a first outer cover that can be attached to the pitch of the V-groove 7 of the optical fiber fusion splicing device 1 described above. For an optical fiber 3A having a first coating layer having a diameter of 0.25 mm, a second coating outer diameter having a plurality of coating layers with a diameter larger than the first coating outer diameter of 0.25 mm. In order to hold a plurality of optical fiber cores 3 having two coating layers, for example, a plurality of optical fiber cores 3 having a second coating outer diameter of φ0.50 mm in this embodiment, the second coating layer A first base portion 21 on which the optical fiber core wire 3 having the first base portion 21 is placed, and a clamp portion comprising a first clamp 23 and a second clamp 25 for pressing the optical fiber strand 3A of the first base portion 21. A first optical fiber holder 29 having 27 It is gills.

  In addition, a plurality of coatings whose outer coating diameter of the optical fiber core wire 3 is removed from φ0.50 mm to the first coating outer diameter φ0.25 mm using the first optical fiber holder 29 described above. A second optical fiber having a second base portion 31 having a structure for collecting the single-core optical fiber strands 3A and a third clamp 33 for pressing the optical fiber strands 3A of the second base portion 31. A holder 35 is provided.

As described above, the optical fiber holder 15 is divided into the first optical fiber holder 29 and the second optical fiber holder 35. In addition, two positioning holes 37 are provided on the right side surface of the first base portion 21 of the first optical fiber holder 29 in FIG. 1, and these two positioning holes 37 can be inserted and removed. One positioning pin 39 projects from the left side surface of the second base portion 31 of the second optical fiber holder 35 in FIG. The second optical fiber holder 35 is detachably attached to the first optical fiber holder 29. FIGS. 2 and 3 show the first optical fiber holder 29 and the second optical fiber holder. A plurality of optical fiber cores 3 having a second coating layer having a second coating outer diameter in a state in which 35 are abutted, and four in this embodiment, the tip portion of the optical fiber core 3 is the second portion. The coating is removed from the coating outer diameter to the first coating outer diameter, and is finally placed on the first base portion 21 of the first optical fiber holder 29 and the second base portion 31 of the second optical fiber holder 35. In this state, the first, second and third clamps 23, 25 and 33 are opened.

  In FIG. 4, the four optical fiber core wires 3 are placed on the first base portion 21 of the first optical fiber holder 29 and the second base portion 31 of the second optical fiber holder 35, and The state which the 2nd and 3rd clamps 23, 25, and 33 were closed is shown.

  The first optical fiber holder 29 and the second optical fiber holder 35 will be described in more detail.

  As the first optical fiber holder 29, the first base portion 21 has a flat bottom surface on which a plurality of optical fiber cores 3 having the second outer sheath diameter are placed in parallel. A groove 41 is provided. Further, on the left side of the first base portion 21 in FIG. 1, a first clamp 23 is attached to the first base portion 21 so as to clamp a plurality of optical fiber cores 3 placed in the first groove portion 41. It can be opened and closed freely. Further, a second clamp 25 is separately provided adjacent to the right side of the first clamp 23 in FIG.

  The second clamp 25 is provided with a rubber pad 43 for pressing the optical fiber core wire 3 placed on the first base portion 21.

  The first clamp 23 is configured to hold the optical fiber core wire 3 relatively weakly, and the second clamp 25 is configured to hold the optical fiber core wire 3 relatively strong.

  For example, FIG. 5A shows a cross section taken along line VA-VA in FIG. 3 in a state where the first clamp 23 is closed, and the first clamp 23 closed on the upper surface of the first base portion 21. A first magnet 45 for attracting and holding is embedded. In this embodiment, the gap G between the flat bottom surface of the first groove portion 41 and the lower surface of the first clamp 23 in a state where the first clamp 23 is closed is about 0.6 mm. The optical fiber core wire 3 having a diameter of φ0.50 mm is held with a weak force. In addition, since the first clamp 23 and the first magnet 45 have an interval of about 0.6 mm as described above, the attractive force of the first magnet 45 against the first clamp 23 becomes weak.

  On the other hand, FIG. 5B shows a cross section taken along the line VB-VB in FIG. 3 in a state where the second clamp 25 is closed, and the second clamp 25 closed on the upper surface of the first base portion 21. A second magnet 47 for adsorbing is embedded. In this embodiment, the width W1 of the first groove portion 41 is such that the four optical fiber cores 3 having the second outer sheath diameter φ0.50 mm are regulated and accommodated in parallel. In the state where the clamp 25 is closed, the four optical fiber cores 3 placed on the flat bottom surface of the first groove portion 41 are pressed and fixed by a strong force through the rubber pad 43 on the lower surface of the second clamp 25. It is the composition which becomes.

  As the second optical fiber holder 35, the second base portion 31 has a first predetermined surface having a flat bottom surface on which a plurality of optical fiber cores 3 having the second outer diameter are placed in parallel. A second groove portion 49 having a width W2 and a plurality of optical fiber cores 3 communicating with the second groove portion 49 and having a plurality of optical fiber cores 3 extending from a second coating outer diameter φ0.50 mm to a first coating outer diameter φ0. A third groove 51 for gathering the portions whose covering has been removed until the thickness becomes 25 mm, and a third groove having a flat bottom surface, the width of which decreases in a tapered manner from the first predetermined width W2 to the second predetermined width W3. A groove 51 and a fourth groove 53 having a flat bottom surface that communicates with the third groove 51 and extends to the front end of the second base portion 31 with the second predetermined width W3, that is, to the right end in FIG. It has been. In addition, said 2nd predetermined width W3 is made into the dimension which controls and accommodates the multiple pieces of optical fiber strand 3A of the 1st coating outer diameter in parallel.

  Further, the second base portion 31 relatively strongly strengthens the optical fiber 3A on which the third clamp 33 is placed from the second groove portion 49 to the fourth groove portion 53 through the third groove portion 51. It can be opened and closed for clamping.

  The third clamp 33 is provided with a rubber pad 55 for pressing the optical fiber 3 </ b> A placed on the second base portion 31.

  For example, FIG. 5C shows a cross section taken along the line VC-VC in FIG. 3, and in this embodiment, the first predetermined width W2 of the second groove portion 49 is the second coating outer diameter φ0. It is formed wider than the parallel dimension of four optical fiber cores 3 of 50 mm.

  FIG. 5D shows a cross section taken along line VD-VD in FIG. 3 with the third clamp 33 closed. The third clamp 33 closed on the upper surface of the second base portion 31. The 3rd magnet 57 for adsorb | sucking is embedded. In this embodiment, the second predetermined width W3 of the fourth groove portion 53 is a dimension that can accommodate the four optical fiber strands 3A having the first coating outer diameter φ0.25 mm in a parallel state. With the clamp 33 closed, four optical fiber strands 3A having a first outer sheath diameter of 0.25 mm placed on the flat bottom surface of the fourth groove portion 53 are rubber pads 55 on the lower surface of the third clamp 33. It is configured to be held down and fixed with a strong force.

  Next, using the optical fiber holder 15 according to this embodiment, for example, the first coating layer having the first coating outer diameter φ0.25 mm and the second coating outer diameter φ0.50 mm are configured by the above configuration. An operation sequence for removing the coating from the four optical fiber cores 3 having the two coating layers with the second coating layer will be described.

  6A, when the first clamp 23 of the first optical fiber holder 29 is closed, as shown in FIG. 5A, the flat bottom surface of the first groove 41 and the first A gap G of about 0.6 mm is generated on the lower surface of the clamp 23. At this time, the second clamp 25 is open. The portions of the four optical fiber cores 3 having the second outer sheath diameter φ0.50 mm are inserted into the first groove 41 from the gap G as indicated by arrows in FIGS. 5 (A) and 6 (A). . Since the first clamp 23 is attracted by the first magnet 45 with a weak force, each optical fiber core wire 3 is lightly pressed by the first clamp 23 and does not open naturally. Therefore, without worrying that the optical fiber core wire 3 inserted into the first groove portion 41 is an optical fiber strand having a diameter larger than the first coated outer diameter φ0.25 mm, a single core is successively formed. The optical fiber core wire 3 can be inserted. In the first groove 41 on the right side in FIG. 6A from the position of the first clamp 23, as shown in FIG. 5B, four optical fiber cores having a second coating outer diameter φ0.50 mm. The wires 3 are brought into contact with each other and stored in parallel.

  Next, when the second clamp 25 is closed as shown in FIG. 6 (B), the second clamp 25 is attracted by the second magnet 47 with a strong force, and therefore shown in FIG. 5 (B). Thus, the four optical fiber core wires 3 placed on the flat bottom surface of the first groove portion 41 are pressed and fixed by a strong force through the rubber pad 43 on the lower surface of the second clamp 25.

  In this fixed state, using a dedicated tool (not shown), the tip of each of the four optical fiber cores 3 protruding rightward in FIG. 6B from the end face of the first optical fiber holder 29 is shown. The second coating layer is removed from the second coating outer diameter φ0.50 mm to the first coating outer diameter φ0.25 mm, so that an optical fiber 3A having the first coating layer is obtained.

  Next, as shown in FIG. 6C, the positioning pins 39 of the second optical fiber holder 35 are positioned with respect to the two positioning holes 37 on the right side surface of the first optical fiber holder 29 described above. By being inserted, the second optical fiber holder 35 is mounted at a predetermined position on the side surface of the first optical fiber holder 29 as shown in FIG.

  At this time, by configuring the second magnet 47 and the third magnet 57 with different magnetic poles, for example, when the second magnet 47 has an N pole, the third magnet 57 is set to an S pole or vice versa. Since the second optical fiber holder 35 is attracted to the first optical fiber holder 29, the second optical fiber holder 35 is in close contact with each other and is not easily separated.

  In the process in which the second optical fiber holder 35 approaches the first optical fiber holder 29 from the state shown in FIG. 6C to the state shown in FIG. 7A as described above, the first coating outer diameter φ0.25 mm. The portions of the four optical fiber strands 3A having the first coating layer are lightly pressed from above by the operator's fingers, and the second groove portion of the second base portion 31 of the second optical fiber holder 35 The second optical fiber holder 35 is moved so that the second optical fiber holder 35 moves into the fourth groove portion 53 having the second predetermined width W3 after being assembled via the third groove portion 51 whose width is reduced from the taper 49 to the second groove portion 51. It is adsorbed by one optical fiber holder 29.

  Next, as shown in FIG. 7B, when the third clamp 33 is closed, the third clamp 33 is attracted by the third magnet 57 with a strong force, so that it is shown in FIG. 5D. In this way, the four optical fiber strands 3A having the first coated outer diameter φ0.25 mm placed on the flat bottom surface of the fourth groove portion 53 are exerted with a strong force through the rubber pad 55 on the lower surface of the third clamp 33. It is pressed and fixed.

  In this fixed state, by using a dedicated tool (not shown), the tip of each of the four optical fiber strands 3A protruding rightward in FIG. 7B from the end face of the second optical fiber holder 35 is used. The first coating layer is removed, and the outer diameter of the first coated outer diameter is 0.25 mm, and the outer diameter of the bare optical fiber 5 is 0.125 mm. The bare optical fiber 5 is cut to a predetermined length by a cleaver (not shown). The

  As described above, the four optical fiber cores 3 are held by the first optical fiber holder 29 and the second optical fiber holder 35, and the bare optical fiber 5 is exposed, as shown in FIG. As shown in FIG. 9A, when the optical fiber fusion splicing device 1 is set at the left and right positions, each bare optical fiber 5 is placed in each butt V groove 7 of the optical fiber clamp 11. It is positioned and fixed with a clamp 9. The bare optical fibers 5 are abutted with each other and are fused and connected together by the discharge electrode 19.

  By performing the above operation, the divided first optical fiber holder 29 and the second optical fiber can be obtained even in the optical fiber core wire 3 having a coating outer diameter larger than φ0.25 mm and having a plurality of coating layers. By using the optical fiber holder 15 composed of the holder 35, it is possible to easily use the multi-fiber optical fiber fusion splicing device 1 that has been used conventionally, and to provide light having a coating outer diameter larger than φ0.25 mm. A plurality of the fiber core wires 3 can be fusion-spliced simultaneously.

  In the above-described embodiment, the first optical fiber holder 29 is used to remove the coating from the second coated outer diameter φ0.50 mm to the first coated outer diameter φ0.25 mm of the four optical fiber strands 3B. The single-core optical fiber 3A having one coating layer is gathered in the tapered third groove portion 51 provided in advance in the second optical fiber holder 35. As another embodiment, As shown in FIG. 8, the tapered third groove portion 51 of the second optical fiber holder 35 has both width taper portions 59 independently formed at the center of the third groove portion 51 by the slide mechanism. It is provided so that it can approach and leave. The other configuration is almost the same.

  In this case, the taper portions 59 having both widths are separated from the center of the third groove portion 51, and the first optical fiber holder 29 and the second optical fiber holder 35 are integrated with each other. The four optical fiber strands 3A having a coating outer diameter of 0.25 mm can be assembled by sliding the taper portion 59 toward the center of the third groove portion 51 by the slide mechanism. The same effect can be obtained.

  From the above, the following effects are obtained.

(1) An optical fiber core wire 3 having a plurality of coating layers laminated with a coating outer diameter larger than φ0.25 mm is obtained by using a conventional multi-core optical fiber fusion splicer 1 to form one optical fiber. A plurality of the optical fiber core wires 3 can be fusion-spliced simultaneously with the holder 15.

(2) An optical fiber core wire 3 having a plurality of coating layers laminated with a coating outer diameter larger than φ0.25 mm is formed by using a conventional multi-core optical fiber fusion splicer 1 to form a plurality of the above-mentioned light beams. When the fiber cores 3 are fusion-spliced at the same time, the plurality of optical fiber cores 3 are removed from a thick diameter to a first coating outer diameter of 0.25 mm, and then the first coating outer diameter is removed. It can lead out to the bare optical fiber 5 of φ0.25 mm to φ0.125 mm. Therefore, a plurality of optical fiber cores 3 having a coating outer diameter larger than φ0.25 mm can be easily fusion-bonded simultaneously.

  That is, as in the prior art, the first optical fiber holder is used to remove the coating of the plurality of optical fiber core wires 3 from a large diameter to a first coating outer diameter φ0.25 mm. Using the optical fiber holder, the optical fiber cores 3 are set in a state where the coating of the optical fiber cores 3 is aligned, and the first optical fiber holder 3 is coated with the bare optical fiber 5 having an outer diameter of 0.25 mm to 0.125 mm. Therefore, it is not necessary to move the plurality of optical fiber strands 3A to the second optical fiber holder.

(3) The first optical fiber holder 29 includes a first clamp 23 that holds the optical fiber core wire 3 relatively weakly, and a second clamp 25 that holds the optical fiber strand 3B relatively strong. Therefore, even if the optical fiber core wires 3 having a coating outer diameter larger than φ0.25 mm are set to the first clamp 23 one by one, they are held with a weak force. At the same time, the second clamp 25 can be easily and strongly held and fixed.

It is a perspective view of the optical fiber holder of embodiment of this invention. It is a perspective view of an optical fiber holder showing the state where the 1st and 2nd optical fiber holders of an embodiment of this invention were integrated, and a plurality of optical fiber strands were stored. FIG. 3 is a plan view of FIG. 2. It is a perspective view of the optical fiber holder of the state which closed the 1st, 2nd, 3rd clamp of FIG. (A) is a sectional view taken along line VA-VA in FIG. 3, (B) is a sectional view taken along line VB-VB in FIG. 3, and (C) is a sectional view taken along line VC-VC in FIG. It is sectional drawing, (D) is sectional drawing of the arrow VD-VD line | wire of FIG. (A) is a perspective view which shows the state when the 1st clamp of a 1st optical fiber holder is closed, (B) is a perspective view which shows the state when the 2nd clamp is closed from the state of (A). (C) is a perspective view showing a state before the second optical fiber holder is attached to the first optical fiber holder from the state of (B). 6A is a perspective view showing a state in which the second optical fiber holder is integrally attached to the first optical fiber holder from the state of FIG. 6C, and FIG. It is a perspective view which shows a state when 3 clamps are closed. It is a top view of the optical fiber holder of other embodiment of this invention. (A) is a whole top view of the optical fiber fusion splicing device concerning this embodiment of the invention, and (B) is a sectional view of an arrow IXB-IXB line of (A). (A) is a longitudinal cross-sectional view of the conventional optical fiber holder in the longitudinal direction, and (B) is a cross-sectional view taken along line XB-XB in (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical fiber fusion splicing device 3 Optical fiber core wire 3A Optical fiber strand 5 Bare optical fiber 7 Butting V groove 9 Clamp 11 Optical fiber clamp 15 Optical fiber holder 19 Discharge electrode 21 1st base part 23 1st clamp 25 Second clamp 27 Clamp portion 29 First optical fiber holder 31 Second base portion 33 Third clamp 35 Second optical fiber holder 37 Positioning hole 39 Positioning pin 41 First groove 45 First magnet 47 Second Magnet 49 Second groove 51 Third groove 53 Fourth groove 57 Third magnet 59 Tapered part W1 First predetermined width W2 Second predetermined width

Claims (5)

A first base portion including a first groove portion on which a plurality of optical fiber core wires having a second outer sheath diameter larger than the first outer sheath diameter are placed in parallel; and the first groove portion A clamp part comprising first and second clamps separately provided adjacent to each other in the longitudinal direction of the first groove part to clamp the optical fiber core to be placed, wherein the first clamp is A first optical fiber holder having a clamp portion configured to hold the optical fiber core wire relatively weakly and the second clamp to hold the optical fiber core wire relatively strongly;
A plurality of optical fiber cores having a second outer sheath diameter, and a second groove portion having a first predetermined width parallel to the plurality of optical fiber core wires; and the plurality of optical fiber core wires communicated with the second groove portion. A third groove portion for collecting the portions removed from the second covering outer diameter to the first covering outer diameter, wherein the width is from the first predetermined width to the first covering outer diameter; A second base portion having a third groove portion that is tapered and reduced to a second predetermined width for accommodating a plurality of optical fiber strands, and the light placed from the second groove portion to the third groove portion. A second optical fiber holder having a third clamp that strongly holds the tip of the fiber strand;
Ri Na provided second optical fiber holder detachably attached to the first optical fiber holder,
A second magnet for attracting the second clamp is provided on the upper surface of the first base portion, and a third magnet for attracting the third clamp is provided on the upper surface of the second base portion. An optical fiber holder, wherein the second magnet and the third magnet are configured with different magnetic poles for attracting the first optical fiber holder and the second optical fiber holder. . A pair of positioning holes are provided on the attachment / detachment surface of the first base portion, and a pair of positioning pins that can be inserted into and removed from the pair of positioning holes are provided on the attachment / detachment surface of the second base portion. The optical fiber holder according to claim 1, wherein the optical fiber holder is protruded. The third groove portion is provided on the upper surface of the second base portion, and is formed by sliding a pair of tapered portions having inclined surfaces toward the center of the third groove portion. The optical fiber holder according to claim 1 or 2 . The second base portion, said third communication with the groove, and claim 1, characterized in that it comprises fourth grooves extending in a second predetermined width to the front end of the second base portion, 2 or 3. The optical fiber holder according to 3 . The method of using the optical fiber holder according to any one of claims 1 to 4, wherein the first optical fiber holder covers the first groove portion provided in the first base portion with the first clamp, An optical fiber core having a second coating layer having a second coating outer diameter to be connected is sequentially inserted into a gap formed by the first groove and the first clamp, and each optical fiber core is inserted. The tip end of the optical fiber is held weakly in a state protruding from the first groove by a predetermined length, and the optical fiber having the second coating layer having the second outer diameter is further strengthened by the second clamp. Holding, removing the second coating layer at the tip of each optical fiber core wire from the second coating outer diameter until reaching the first coating outer diameter, exposed to the first coating layer,
The second optical fiber holder is attached to the first optical fiber holder, and the second optical fiber holder includes a plurality of second covering outer diameters held by the first optical fiber holder. The tip of the optical fiber core having the second coating layer, the diameter of which is reduced from the second coating outer diameter to the first coating outer diameter, is the second of the first predetermined width provided on the second base portion. The first covering outer diameter portion is set to a second predetermined width by the third groove portion formed in a tapered shape and is placed in the groove portion, and the first covering outer diameter portion is set to the second portion. Each light projecting from the front end of the base portion by a predetermined length, holding each optical fiber placed on the third groove portion strongly by a third clamp, and projecting from the front end of the second base portion Remove the coating layer at the tip of the fiber strand and expose it as a bare optical fiber Out, and the use of optical fiber holders, which comprises cutting each bare optical fiber this is lead-out to the same length.

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