JP4989777B2 - Optical fiber connection parts and connection method - Google Patents

Description

  The present invention relates to an optical fiber connecting technique by facing and aligning optical fibers, and in particular, an optical fiber connecting component and an optical fiber connecting capable of connecting an optical fiber core without removing the coating of the optical fiber core. Regarding the method.

  Conventionally, optical connectors, fiber fusion splicing, mechanical splices or the like are used for connecting optical fibers. In particular, mechanical splices are widely used in optical wiring work and the like because optical connection is possible with a simple operation compared to optical connector assembly and the like.

  Regarding mechanical splices, for example, those described in Japanese Patent Application Laid-Open No. 9-61655 (Patent Document 1), Japanese Patent Application Laid-Open No. 2001-324638 (Patent Document 2), and the like are known. The mechanical splice is performed by removing the coating of the optical fiber core, cleaning the optical fiber, cleaving the optical fiber, or inserting the optical fiber into a V-groove component.

  Japanese Patent Application Laid-Open No. 2006-010871 (Patent Document 3) describes a method of positioning an optical fiber core wire by compressing and deforming a sandwiched covering portion by a fiber holding member without removing the coating. Technology Letters, pp.804-6, Vol.16, No.3, March 2004. (Non-Patent Document 1) describes a self-forming waveguide as a method for connection without removing the coating of the optical fiber core wire. The optical fiber connection used is described.

JP-A-9-61655 JP 2001-324638 A JP 2006-010871 A IEEE Photonics Technology Letters, pp.804-6, Vol.16, No.3, March 2004.

  However, when connecting an optical fiber by a conventional mechanical splice or the like, it is necessary to handle the optical fiber in a state where the coating is removed, and thus there is a problem of breakage such as breaking the optical fiber during the operation.

  An optical fiber is generally an ultrafine glass having a diameter of 125 μm or 80 μm, and there is a risk of being easily broken during work. In addition, there is a problem that the number of work steps increases, such as removal of the coating of the optical fiber core wire and cleaning of the optical fiber.

  As a method for performing the connection without removing the coating of the optical fiber core wire, there is an optical fiber connection method using a self-formed waveguide proposed in Non-Patent Document 1 described above. The connection proposed in this document There is a problem in simplicity at this stage, such as the method requiring ultraviolet irradiation.

  An object of the present invention is to provide an optical fiber connecting component and an optical fiber connecting method capable of solving the above problems and connecting optical fibers without damaging the optical fiber by a simple method.

  In order to achieve the above object, the present invention makes it possible to connect optical fibers by facing and aligning them without removing the coating, thereby handling the optical fiber with the coating removed. Since it is no longer necessary, the number of work steps can be reduced, and the probability of damaging the optical fiber during work can be greatly reduced.

The features of the present invention will be described below.
a) Optical fiber connection parts for positioning an optical fiber in optical fiber connection by facing and aligning optical fibers, and an optical fiber core fixing part and an optical fiber core for fixing an optical fiber core having a coating An optical fiber holding part that directly contacts the optical fiber through the coating of the wire is arranged so as to contact the optical fiber core along the direction in which the optical fiber core extends.

  Conventionally, in opposition alignment of optical fibers such as a mechanical splice, the coating 3 of the optical fiber core wire 1 is removed to form a bare optical fiber 2 as shown in FIG. 14, and the optical fiber 2 is shown as an example in FIG. Are aligned on the V-groove substrate 4 (actually, the two optical fibers to be connected are aligned from both sides, but only one optical fiber 2 is shown in FIG. 15), and the two optical fibers are abutted against each other As shown in FIG. 16, the optical fiber 2 is pressed from the upper side by the V-groove pressing plate 5 to realize the connection between the optical fibers.

  However, as described above, the optical fiber 2 is generally an ultra-fine glass having a diameter of 125 μm or 80 μm, and there is a risk of being easily broken during work. In order to prevent damage to the optical fiber 2, it is conceivable to align the optical fiber core wire 1 with the V-groove substrate 4 without removing the coating, but the outer diameter accuracy of the coating of the optical fiber core wire 1 is the same as that of the optical fiber 2. Since it is remarkably inferior to the outer diameter accuracy, sufficient alignment accuracy could not be obtained and good connection characteristics could not be realized when facing and aligning by the same method.

  On the other hand, according to the present invention, the optical fiber core wires are stably held at the optical fiber core wire fixing portion by abutting the optical fiber core wires to be opposed and aligned at the center portion of the optical fiber holding portion. The optical fiber holding part penetrates the coating and enables positioning of the optical fiber with the same accuracy as the outer diameter of the optical fiber. Therefore, it is possible to connect by aligning the optical fiber cores without removing the coating. can do.

  Since the positioning accuracy in the present invention is the same as the outer diameter accuracy of the optical fiber, it is possible to obtain connection characteristics equivalent to those of the mechanical splice. Furthermore, since it is not necessary to remove the coating, the risk of damaging the optical fiber during work can be reduced. Moreover, it becomes possible to delete the coating removal step. The optical fiber core fixing part and the optical fiber holding part are separate parts, and they can be arranged so as to contact the optical fiber core along the direction in which the optical fiber core extends.

  Further, the optical fiber pressing portion has a razor blade-like structure. Thereby, it becomes easy to penetrate the coating of the optical fiber core wire and directly contact the optical fiber holding portion with the optical fiber.

b) In the optical fiber connecting part, as shown in FIGS. 3 and 4, the tip direction of the blade of the optical fiber holding portion 9 is the diameter direction of the optical fiber, that is, the tip of the blade is directed to the center of the optical fiber 2. It is characterized by being arranged like this. As a result, as shown in FIG. 3 and FIG. 4 as an example of the configuration, the optical fiber can be stably held isotropically.

c) In the above optical fiber connecting part, the optical fiber core wire fixing portion has a V-groove or U-groove structure. Thus, as shown in FIG. 1 or FIG. 3, the optical fiber core 1 is fixed on the V-groove type optical fiber core fixing part 7 or the U-groove type optical fiber core fixing part 10 in a stable state. Is possible.

d) Further, in the above optical fiber connecting part, the optical fiber core wire fixing part has a capillary structure. As a result, as shown in FIG. 5 as an example of the configuration, the optical fiber core wire 1 is housed in the capillary-type optical fiber core wire fixing portion 11 so that the optical fiber core wire 1 is stable regardless of the direction of the jig. Can be fixed.

e) Further, in the optical fiber connecting method using the optical fiber connecting parts described in the above a) to d), the optical fiber core wire 1 is installed in the optical fiber core wire fixing portion (7, 10, 11). After that, the optical fiber holding part (8, 9) is moved in the direction of the optical fiber core fixing part (7, 10, 11) and pressed against the butted portion of the optical fiber core 1 to thereby obtain the optical fiber holding part (8 9) penetrates the coating 3 of the optical fiber core wire 1 and directly contacts the optical fiber 2 to position the optical fiber 2.

  For example, in a conventional optical fiber connection method such as a mechanical splice, as shown in FIG. 17, a space is formed between the V-groove substrate 4 and the V-groove holding plate 5 by the wedge plate 6, and both optical fibers 2 are connected in this state. The optical fiber is inserted from the optical fiber insertion port (only one optical fiber is shown), the optical fibers are butted together at the center position of the V-groove substrate 4, and the wedge plate 4 is pulled out to obtain the V-groove substrate 4 and the V-groove holding plate. In FIG. 5, positioning was performed so as to sandwich the optical fiber 2. However, in this method, the optical fiber insertion port is narrow, and it is necessary to perform work carefully so as not to damage the optical fiber 2.

  On the other hand, according to the optical fiber connection method of the present invention, the optical fiber core wire 1 is placed in the optical fiber core wire fixing portion (7, 10, 11) with the optical fiber core wire 1 facing each other. By pressing (8, 9) toward the center in the diameter direction of the optical fiber core 1, the connection of the optical fiber 2 can be realized without removing the coating 3. Alignment can be easily performed. Furthermore, since there is no work in the bare fiber state, the risk of accidentally damaging the optical fiber 2 can be reduced.

f) Further, in the optical fiber connecting method using the optical fiber connecting parts described in the above a) to d), the optical fiber core wire 1 is installed in the optical fiber core wire fixing portion (7, 10, 11). In the state where the tip of the optical fiber holding part (8, 9) is in direct contact with the optical fiber, the optical fiber core fixing part (7, 10, 11) and the optical fiber holding part (8, 9) 9), and by sliding and inserting the optical fiber core wire 1 into the space formed by the optical fiber core wire fixing portion (7, 10, 11) and the optical fiber holding portion (8, 9), The coating 3 of the optical fiber core wire 1 is fixed to the optical fiber core wire fixing portion (7, 10, 11), and the tip of the optical fiber holding portion (8, 9) is in direct contact with the optical fiber 2 so that the optical fiber It is characterized by performing positioning of 2 .

  Thereby, the optical fiber core wire fixing portion (7, 10, 11) and the optical fiber holding portion (8) are pressed while the coating 3 of the optical fiber core wire 1 is pressed against the optical fiber core wire fixing portion (7, 10, 11). 9), the optical fiber 2 is inserted while being slid into the space formed and the end faces of the optical fibers 2 are brought into contact with each other. Since the coating 3 is directly contacted with the optical fiber 2 so as to cut the coating 3, it is possible to realize the connection of the optical fiber without removing the coating 3.

  As described above, since the work in the state of the bare fiber is eliminated, the risk of accidentally damaging the optical fiber 2 when the optical fiber core wire 1 is introduced into the optical fiber connecting part can be reduced. it can.

g) Further, in the optical fiber connecting method using the optical fiber connecting parts described in the above a) to d), the optical fibers 2 are positioned at relative positions so that the tips of the optical fiber pressing portions 9 are in direct contact with the optical fiber 2. A plurality of optical fiber holding portions 9 are installed in advance, and the optical fiber core wire 1 is slid and inserted into a space formed by the tips of the plurality of optical fiber holding portions 9 (FIGS. 3, 4, 6, and 6). 7), the tips of the plurality of optical fiber holding portions 9 penetrate the coating 3 of the optical fiber core wire 1 and directly contact the optical fiber 2, thereby positioning the optical fiber 2.

  Accordingly, when the optical fiber core wire 1 is inserted into the space formed by the tip of the optical fiber holding portion 9 and the end faces of the optical fibers 2 are brought into contact with each other, a plurality of optical fibers are inserted when the optical fiber core wire 1 is inserted. Positioning is achieved by directly contacting the optical fiber 2 so that the tip of the holding portion 9 cuts the coating 3 of the optical fiber core wire 1, and it becomes possible to realize connection of the optical fiber without removing the coating. . In this way, since the work in the bare fiber state is eliminated, the risk of accidentally damaging the optical fiber can be reduced.

h) Further, in the optical fiber connecting part described in the above d), as shown in FIG. 6, a plurality of optical fiber holding portions 9 are connected to the capillary from the inner wall surface of the optical fiber core fixing portion 13 having a capillary structure. The diameter of the circle circumscribing the tip of the optical fiber holding portion 9 is the same as the diameter of the optical fiber 2, and the center of the circumscribed circle is the center of the optical fiber core fixing portion 13. An optical fiber core insertion guide having a capillary structure that is the same, has an outer diameter that is substantially the same as the outer diameter of the optical fiber core fixing portion 13, and has an inner diameter that is substantially the same as the outer diameter of the optical fiber core 1. The optical fiber core wire insertion guide parts 12a and 12b having the capillary structure are arranged at both ends of the capillary optical fiber fixing portion 13 having the capillary structure, and the optical fiber of the capillary structure is provided. The core wire fixing portion 13 and the optical fiber core wire insertion guide parts 12a and 12b having a capillary structure are aligned along the direction in which the optical fiber extends by the sleeve (for example, the split sleeve 14) and coaxially with the optical fiber core wire. It is characterized by that.

  Generally, the diameter of an optical fiber is about 125 μm or 80 μm, and an insertion guide or the like is used together when inserting an optical fiber into an optical fiber insertion hole provided in an optical component. Is required.

  Therefore, a connecting part in which a fiber insertion guide is integrally formed is used in a mechanical splice or the like. However, when the optical component and the fiber insertion guide are separate components, a mechanism for alignment is required.

  In the present invention, since the positioning is performed by aligning the optical fiber core wire fixing component 13 and the fiber insertion guide components 12a and 12b with the sleeve, the positioning can be performed by a very simple method. For example, as shown in FIG. 6, if an optical connector ferrule is used as a capillary-shaped part and an optical connector split sleeve 14 is used as the sleeve, the optical fiber core wire insertion guide part 12a, the optical fiber core are used. By simply inserting the wire fixing component 13 and the optical fiber core wire insertion guide component 12b in this order into the split sleeve 14, the components are aligned on the same axis and the positioning is automatically completed.

  In the example of FIG. 6, optical fiber core wire insertion guide parts 12a and 12b, in which the hole diameter at the center of the optical connector ferrule is processed to the same extent as the outer diameter of the optical fiber core wire 1, An optical fiber core fixing part 13 having a structure in which an optical fiber holding part 9 having four triangular cross sections protrudes from the wall surface toward the center of the capillary is shown. In this figure, A is a side view seen from the left side, B is a cross-sectional view of the optical fiber core wire insertion guide component 12a, C is a cross-sectional view of the optical fiber core wire fixing component 13, and D is an optical fiber core wire insertion guide. It is sectional drawing in the components 12b.

  FIG. 7 shows a case where the number of the optical fiber pressing portions 9 protruding from the inner wall surface of the optical fiber core wire fixing portion toward the center of the capillary is three. The number of optical fiber pressing portions 9 is not limited to this.

i) Further, in the optical fiber connection method using the optical fiber connection component described in h) above, the optical fiber core wire 1 is inserted from the optical fiber core wire insertion guide component 12 of the capillary structure, and the light of the capillary structure is inserted. The optical fiber is positioned so that the optical fiber core 1 abuts at the center of the fiber core fixing part 13.

  Thereby, since the optical fiber core wire insertion guide component 12 is used, the optical fiber core wire 1 can be easily inserted. In addition, since the optical fiber connecting part in which the optical fiber core fixing part 13 is sandwiched between the two optical fiber core insertion guide parts 12a and 12b is used, only by the operation of inserting the optical fiber core 1, Since the optical fiber core wire 1 is fixed by the optical fiber core wire fixing portion, the optical fiber can be positioned by the optical fiber pressing portion 9 protruding from the inner wall surface of the optical fiber core wire fixing portion toward the center of the capillary. It is possible to realize the connection of the optical fiber without removing the coating by a very simple operation.

j) In addition, a plurality of optical fiber pressing portions protrude from the inner wall surface of the optical fiber core fixing portion having a capillary structure toward the center of the capillary, and the diameter of a circle circumscribing the tip of the optical fiber pressing portion is It is the same as the diameter of the optical fiber, the center of the circumscribed circle is the same as the center of the capillary structure optical fiber fixing part, and the outer diameter is the same as the outer diameter of the capillary structure optical fiber fixing part. An optical fiber core insertion guide part having a capillary structure having an inner diameter substantially the same as the outer diameter of the optical fiber core, and the capillary structure optical fiber core insertion guide part at both ends of the capillary structure optical fiber core fixing part. The capillary structure optical fiber core wire fixing portion and the capillary structure optical fiber core wire insertion guide part are aligned along the extending direction of the optical fiber core wire by the sleeve. And parts for optical fiber connection which is aligned coaxially, is characterized in that is incorporated in the sleeve holder 17 of the optical connector adapter 15.

The optical connector adapter 15 has a structure as shown in FIG.
A sleeve holder 17 is provided inside, and a split sleeve (not shown) for positioning the ferrule of the optical connector plug is incorporated therein. Instead of this split sleeve, an optical connector adapter 15 for connecting an optical fiber core can be obtained by incorporating an optical fiber connecting component according to the present invention using an optical connector split sleeve into the sleeve holder 17. it can.

k) Further, in the optical fiber connecting method using the optical fiber connecting part described in j) above, the two optical fiber cores 1 are arranged on both sides of the capillary optical fiber core wire insertion guide parts 12a and 2b. The optical fiber 2 is positioned so that the two optical fiber cores 1 abut each other at the center of the optical fiber core fixing part 12 having a capillary structure.

  In this way, since commercially available products such as the optical connector adapter 15, split sleeve, ferrule, etc. can be used, it is possible to produce optical fiber connecting parts at low cost, and to cover the optical fiber core wire. Since removal and the like are unnecessary, an inexpensive and simple optical fiber connection can be realized.

l) Further, in the optical fiber connecting method described in the above e) to g), i), k), a refractive index matching agent is used in a connecting portion of two optical fibers. For this reason, even if the end face of the optical fiber is a plane, the connection loss can be reduced.

  According to the present invention, it is possible to connect optical fibers by opposing alignment without removing the coating of the optical fiber core, reducing the risk of damage to the optical fiber, and connecting the optical fiber core by a simple method. An optical fiber connecting component and an optical fiber connecting method are possible.

  Hereinafter, specific examples of the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited to these examples.

Example 1
9 to 11 show an embodiment of the optical fiber connecting part whose configuration is shown in FIG.

  The optical fiber holding part has a structure in which two razor-shaped blades are fixed so as to be spaced at a distance smaller than the diameter of the optical fiber. As shown in FIG. 1, the optical fiber core wire 1 can be penetrated through the coating of the optical fiber core wire 1 in a stable state without repelling the optical fiber core wire 1 in a stable state. It becomes.

  The distance a between the tips of the two blades of the two-blade optical fiber holding part 8 shown in FIG. 2 needs to be smaller than the diameter of the optical fiber 2. For example, when the diameter of the optical fiber 2 is 125 μm, the distance a between the tips of the two blades is desirably 70 μm to 100 μm. When the distance a between the tips of the blades is as narrow as 70 μm or less, the optical fiber core wire 1 may be flipped to the left or right. In addition, when the distance a between the blade tips is as wide as 100 μm or more, the optical fiber may be sandwiched between the blades and the optical fiber may not be positioned or the accuracy may be greatly deteriorated.

  By stacking the blades of the shape used for razor blades, etc. so that the distance between the blade edges is 70 μm to 100 μm (when the diameter of the optical fiber is 125 μm, the same applies hereinafter), and fixing it to the groove provided on the flat plate, A two-blade optical fiber pressing portion 8 is formed. The cutting edge of the tip of the two-blade optical fiber pressing portion 8 has a shape having a width like a razor blade as shown in the two-blade optical fiber pressing portion 8 of FIG.

  A V-groove type optical fiber core fixing part 7 having a V-groove is used as the optical fiber core fixing part, and side walls are provided on both sides for positioning the two-blade optical fiber pressing part 8. A system stop 19 is provided inside the side wall. Further, a locking projection 20 is provided on the side surface of the flat plate of the two-blade optical fiber pressing portion 8 (see FIG. 10).

  After the optical fiber core wire 1 is aligned with the V groove of the V-groove type optical fiber fixing portion 7 and brought into a state as shown in FIG. 10, the tip of the blade of the two-blade optical fiber holding portion 8 is covered. When the two-blade optical fiber pressing portion 8 is pushed so as to penetrate and the state as shown in FIG. 11 is obtained, a locking projection 20 is formed on the side surface of the flat plate of the two-blade optical fiber pressing portion 8. The optical fiber core wire fixing part 7 is fixed to the locking part 19 on the side wall. Thereby, it becomes possible to position the optical fiber with the same accuracy as the outer diameter of the optical fiber without removing the coating of the optical fiber core wire 1.

(Example 2)
FIGS. 12 and 13 show an embodiment having a structure different from that of the first embodiment of the optical fiber connecting part whose configuration is shown in FIG.

  As in Example 1, a two-blade optical fiber holder is obtained by stacking blades used for shaving blades and the like so that the distance between the blade edges is 70 μm to 100 μm and fixing them in a groove provided on a flat plate. Part 8 is formed. However, here, a fixing portion 22 for fixing to the V-groove type optical fiber core fixing portion 7 is provided above the two-blade optical fiber pressing portion 8. A fiber pressing installation portion 21 is provided on one side of the V-groove type optical fiber core fixing portion 7 provided with the V-groove.

  The two-blade optical fiber holding portion 8 is fixed to the fiber holding portion 21 of the V-groove type optical fiber fixing portion 7 by the fixing portion 22 so that the center of the two-blade edge coincides with the center of the optical fiber core wire 1. It is attached. After aligning the optical fiber core wire 1 with the V-groove, the fixing portion 22 of the two-blade optical fiber presser is pushed in so that the tip of the blade of the two-blade optical fiber presser 8 penetrates the coating. By setting the state as in FIG. 13, it is possible to position the optical fiber with the same accuracy as the outer diameter of the optical fiber 2 without removing the coating of the optical fiber core wire 1.

(Example 3)
Conventionally, in the opposite alignment of optical fibers such as a mechanical splice, the bare optical fiber 2 from which the coating 3 of the optical fiber core wire 1 shown in FIG. 14 is removed is aligned on a V-groove substrate as shown in FIG. In FIG. 15, only one optical fiber 2 is shown), and the two optical fibers are connected to each other by holding the optical fiber 2 from above by the V-groove holding plate 5 as shown in FIG. is doing.

  However, as described above, the optical fiber is generally an ultra-fine glass having a diameter of 125 μm or 80 μm, and there is a risk of being easily broken during the operation. In addition, there is a problem that the number of work steps is increased, such as removal of the coating of the optical fiber core wire and cleaning of the optical fiber 2.

  Although the optical fiber core wire 1 can be aligned by the V-groove substrate, the outer diameter accuracy of the coating of the optical fiber core wire is significantly inferior to the outer diameter accuracy of the optical fiber. Sufficient positioning accuracy cannot be obtained.

  On the other hand, Patent Document 3 describes a method in which an optical fiber core wire is sandwiched by a fiber holding member and positioned by compressing and deforming the covering without removing the sheath of the optical fiber as described above.

  In the following, the case where the coating of the optical fiber core wire as described in Patent Document 3 is compressed and deformed, and the tip of the optical fiber pressing portion of the present invention penetrates the coating of the optical fiber core wire and directly into the optical fiber. The case where the optical fiber is positioned by contacting is compared.

  Without removing the coating of the single-mode optical fiber core wire, the connection loss was evaluated when the optical fiber connecting parts were aligned to face each other. A refractive index matching agent is not used.

  First, work was performed using optical fiber connecting parts as shown in FIGS. After the optical fiber core wire is cut, the two optical fiber core wires 1 are abutted against each other by aligning the V-groove optical fiber core wire fixing portion 7 so as to face each other, and a V-groove holding plate 24 (FIG. 19) or a flat plate holding plate 23 (FIG. 18) was weighted from above, and the coating of the optical fiber core wire 1 was compressed and deformed for positioning.

  In this example, an optical connector is attached to the other end of the optical fiber core wire 1 that is attached by opposing alignment, and a light source and a detector are connected to each other. At the time when the optical fiber core wire 1 was opposed and aligned with the V-groove optical fiber core fixing portion 7, the measurement limit of the measuring device was exceeded, and the connection loss could not be measured.

  Subsequently, when the V-groove holding plate 24 (FIG. 19) or the flat plate holding plate 23 (FIG. 18) was weighted from above and the coating of the optical fiber core wire 1 was compressed and deformed, the connection loss gradually increased. It became small, and finally became about 4-5 dB.

  Next, the same evaluation was performed using the optical fiber connecting part of the present invention having the V-groove type optical fiber fixing part 7 shown in FIGS. Also in this case, when the optical fiber core wire 1 is opposed to and aligned with the V-groove optical fiber fixing portion 7, the measurement limit of the measuring device is exceeded and the connection loss cannot be measured. It was.

  Subsequently, when the two-blade optical fiber holding portion 8 is weighted toward the optical fiber core wire 1, the connection loss gradually decreases, and finally about 0.3 to 0.5 dB. It became.

  Thus, in the case of a single mode fiber, sufficient positioning accuracy cannot be achieved only by compressing and deforming the coating of the optical fiber core wire 1, but the two-blade optical fiber holder as in the present invention. By using the optical fiber connecting component and the optical fiber connecting method in which the tip of the portion 8 penetrates the coating of the optical fiber core wire 1 and directly contacts the optical fiber 2 to position the optical fiber 2, It is possible to obtain a high positioning accuracy.

Example 4
In the case of the optical fiber connecting part having the V-groove type optical fiber fixing part 7 as described above, the optical fiber core 1 is aligned with the V-groove part of the V-groove type optical fiber fixing part 7 by its own weight. Therefore, it is necessary to work in a horizontal state when installing the optical fiber core wire 1.

  On the other hand, in the optical fiber connecting component using the capillary type optical fiber fixing part 11 as shown in FIG. 5, after the optical fiber core 1 is inserted into the capillary type optical fiber fixing part 11, Since there is no need to align the optical fiber core 1 by its own weight, there is an advantage that it is not necessary to work in a horizontal state.

  1 and FIGS. 3 to 5, the optical fiber connecting parts as shown in FIG. 1 and FIG. 3 to FIG. 5 are in relative positions so that the tips of the optical fiber holding portions (8, 9) are in direct contact with the optical fiber 2. Even when the optical fiber core fixing part (7, 10) and the optical fiber holding part (8, 9) are installed in advance, after the optical fiber core wire 1 is inserted into the fiber core fixing part (7, 10), Alignment by the weight of the optical fiber core 1 is not necessary, and it is not necessary to work in a horizontal state.

  1 and FIGS. 3 to 5, an optical fiber core fixing portion (in advance) is placed in a relative position such that the tip of the optical fiber holding portion (8, 9) whose structure is shown in FIG. 7 and 10) and the optical fiber holding part (8, 9) installed, the optical fiber holding part (8, 9) is moved by sliding the optical fiber core 1 when the optical fiber core 1 is inserted. 8,9) penetrates the coating and enables positioning of the optical fiber.

  In the case of an optical fiber connecting part as shown in FIG. 18 and FIG. 19, the optical fiber core wire 1 cannot be inserted with the presser plates (23, 24) being weighted from above. As described above, the fiber connecting component has an advantage that the optical fiber can be connected by a simpler operation.

(Example 5)
As described above, the diameter of the optical fiber 2 is generally about 125 μm or 80 μm, and an insertion guide or the like is used together when inserting the optical fiber into the optical fiber insertion hole provided in the optical component. High accuracy is required for positioning. Therefore, a connecting part in which a fiber insertion guide is integrally formed is used in a mechanical splice or the like.

  However, when the optical component and the fiber insertion guide are separate components, a mechanism for alignment is required. When positioning a V-groove component, it is necessary to precisely control the thickness of the component and the dimensions from the side wall to the V-groove, etc., and it is also necessary to fix it with an adhesive or the like, resulting in high component costs. In addition to this, the work process becomes complicated.

  On the other hand, in the present invention, as shown in the example of the configuration in FIG. 6, the optical connection component and the fiber insertion guide are positioned by aligning them with the sleeve, so that each component is simply inserted into the split sleeve. Thus, highly accurate positioning is automatically completed.

  Here, the ferrule for SC type optical connector was diverted, and the optical fiber core wire insertion guide parts 12a and 12b were produced by processing a hole having the same diameter as the optical fiber core wire in the center. Also, an optical fiber core fixing part 13 having an outer diameter the same as that of the SC-type optical connector ferrule is manufactured, and the optical fiber core insertion guide part 12a and the optical fiber core fixing to the split sleeve 14 for the SC-type optical connector. When the component 13 and the optical fiber core wire insertion guide component 12b were inserted in this order, the positioning of these components was automatically completed, so that a good connection loss could be obtained simply by inserting the optical fiber core wire 1. .

  In this way, it is possible to divert a commercially available product, and it is possible to provide an optical connector connecting part having an optical fiber core wire insertion guide part at a low cost by a simple operation.

  Needless to say, the present invention can be applied to any optical fiber having a diameter of 125 μm or 80 μm currently on the market.

It is the figure which showed an example of the components for optical fiber connection which has a 2 piece blade-shaped optical fiber holding | suppressing part. It is the figure which showed the front-end | tip part of the blade of a two-blade optical fiber holding | suppressing part. It is the figure which showed an example of the components for optical fiber connection in which the optical fiber holding | suppressing part was arrange | positioned in the optical fiber diameter direction. It is the figure which showed an example of the components for optical fiber connection which installed the optical fiber core wire fixing | fixed part and the optical fiber holding | maintenance part beforehand in the relative position where the front-end | tip of an optical fiber holding | suppressing part directly contacts an optical fiber. It is the figure which showed an example of the components for optical fiber connection which has a 2 piece blade-shaped optical fiber holding | suppressing part. It is the figure which showed an example of a mode that the optical fiber core wire fixing | fixed part and the optical fiber core wire insertion guide component were aligned with the sleeve. It is the figure which showed the example in case the number of the optical fiber holding | suppressing parts protruded from the inner wall surface of the optical fiber core wire fixing | fixed part to the center direction of a capillary is three. It is the figure which showed the internal structure of the adapter for optical connectors. It is the figure which showed an example of the components for optical fiber connection which has a V-groove type optical fiber core wire fixing | fixed part and a 2 piece blade-shaped optical fiber holding | suppressing part. It is the figure which showed an example of the components for optical fiber connection which has a V-groove type optical fiber core wire fixing | fixed part and a 2 piece blade-shaped optical fiber holding | suppressing part. It is the figure which showed an example of the components for optical fiber connection which has a V-groove type optical fiber core wire fixing | fixed part and a 2 piece blade-shaped optical fiber holding | suppressing part. It is the figure which showed an example of the components for optical fiber connection which has a V-groove type optical fiber core wire fixing | fixed part and a 2 piece blade-shaped optical fiber holding | suppressing part. It is the figure which showed an example of the components for optical fiber connection which has a V-groove type optical fiber core wire fixing | fixed part and a 2 piece blade-shaped optical fiber holding | suppressing part. It is the figure which showed the structure of the optical fiber core wire. It is the figure which showed the alignment method of the optical fiber in a mechanical splice. It is the figure which showed the positioning method of the optical fiber in a mechanical splice. It is the figure which showed the mode of optical fiber insertion in a mechanical splice. It is the figure which showed an example of the component for optical fiber connection which pinches | interposes by a fiber holding member, and does not remove | exclude an optical fiber core wire, and positions it by compressively deforming and positioning (V groove type optical fiber core wire fixing | fixed part and flat plate type) Example of using a holding plate). It is the figure which showed an example of the component for optical fiber connection which inserts | pinches with a fiber holding member, and does not remove | eliminate an optical fiber core wire, and compresses and deforms and positions it (V-groove type optical fiber core wire fixing part and V groove) Example of using a pressing plate).

1: Optical fiber core wire 2: Optical fiber 3: Coating 4: V groove substrate 5: V groove type holding plate 6: Wedge plate 7: V groove type optical fiber core wire fixing part 8: Two-blade optical fiber holding part 9: Optical fiber holding part 10: U-groove type optical fiber fixing part 11: Capillary type optical fiber fixing part 12a, 12b: Optical fiber insertion guide part 13: Optical fiber fixing part 14: Split sleeve 15: Adapter for optical connector 16: Housing 17: Sleeve holder 18: Latch for plug locking 19: Locking portion 20: Locking protrusion 21: Fiber pressing installation portion 22: Fixing portion 23: Flat plate-type pressing plate 24: V groove Die holding plate a: Spacing between blade tips A: Side view B: Cross section at optical fiber core wire insertion guide part 12a C: Cross section at optical fiber core wire fixing part 13 D: Optical fiber core wire Sectional view at insertion guide component 12b

Claims (10)

An optical fiber connecting component for positioning the optical fiber when connecting the optical fiber made of glass in a face-to-face alignment,
An optical fiber core wire fixing portion for fixing an optical fiber core wire coated with the optical fiber;
An optical fiber holding part having a tip that penetrates the coating of the optical fiber core wire and directly contacts the optical fiber;
The optical fiber holding part is a component for connecting an optical fiber, wherein tips of the plurality of optical fiber holding parts are arranged in a diameter direction of the optical fiber. In the optical fiber connecting component according to claim 1,
An optical fiber connecting part, wherein a portion of the optical fiber core fixing portion for fixing the optical fiber core has a V-groove or U-groove structure for accommodating the optical fiber core. In the optical fiber connecting component according to claim 1,
An optical fiber connecting part, wherein the optical fiber core wire fixing part has a capillary structure. In the optical fiber connecting component according to claim 3,
A plurality of optical fiber pressing portions projecting from the inner wall surface of the optical fiber core fixing portion having the capillary structure projecting toward the center of the capillary, and the diameter of a circle circumscribing the tip of the optical fiber pressing portion is an optical fiber The center of the circumscribed circle is the same as the center of the capillary structure optical fiber fixing part, and the outer diameter of the outer diameter of the capillary structure optical fiber fixing part of the capillary structure is approximately the same. An optical fiber core wire insertion guide part having a capillary structure having a diameter and substantially the same inner diameter as the outer diameter of the optical fiber core wire, and an optical fiber having the capillary structure at both ends of the optical fiber core wire fixing portion of the capillary structure A core wire insertion guide component is arranged, and the optical fiber core wire fixing portion of the capillary structure and the optical fiber core wire insertion guide component of the capillary structure are sleeves. Optical fiber connection components, characterized in that it is and coaxially aligned in a direction extending more of the optical fiber.   An optical fiber connecting component according to claim 4, wherein the optical fiber connecting component according to claim 4 is incorporated in a sleeve holder of an optical connector adapter. In the optical fiber connection method using the optical fiber connection component according to any one of claims 1 to 3,
After installing the optical fiber core wire in the optical fiber core wire fixing portion, by moving the optical fiber holding portion in the direction of the optical fiber core wire fixing portion and pressing it against the butted portion of the optical fiber core wire, A method of connecting an optical fiber, wherein the optical fiber pressing portion has a tip that penetrates the coating of the optical fiber core wire and directly contacts the optical fiber to position the optical fiber. In the optical fiber connection method using the optical fiber connection component according to any one of claims 1 to 3,
In a state where the optical fiber core wire is installed in the optical fiber core wire fixing portion, the optical fiber core wire fixing portion and the optical fiber are in a relative position such that the tip of the optical fiber holding portion is in direct contact with the optical fiber. A holding portion is installed, the optical fiber core wire is slid and inserted into a space formed by the optical fiber core wire fixing portion and the optical fiber holding portion, and the optical fiber core wire is coated with the optical fiber core wire. An optical fiber connection method characterized in that the optical fiber is positioned by fixing the optical fiber to a fixing portion and bringing the tip of the optical fiber pressing portion into direct contact with the optical fiber. In the optical fiber connection method using the optical fiber connection component according to claim 4,
Two optical fiber core wires are respectively inserted from the optical fiber core wire insertion guide parts of the capillary structure disposed at both ends of the optical fiber core wire fixing portions of the capillary structure, and the optical fiber core wires of the capillary structure are fixed. An optical fiber connection method comprising positioning an optical fiber so that the two optical fiber core wires abut at the center of the portion. In the optical fiber connection method using the optical fiber connection component according to claim 5,
Two optical fiber core wires are respectively inserted from the optical fiber core wire insertion guide parts of the capillary structure disposed at both ends of the optical fiber core wire fixing portions of the capillary structure, and the optical fiber core wires of the capillary structure are fixed. An optical fiber connection method comprising positioning an optical fiber so that the two optical fiber core wires abut at the center of the portion. In the optical fiber connection method according to any one of claims 6 to 9,
A method for connecting optical fibers, wherein a refractive index matching agent is used for a connecting portion of the two optical fiber core wires.