JP4971406B2 - Optical splitter module - Google Patents

Description

  The present invention is an optical splitter that emits an optical signal incident on one terminal from two or more terminals (in the reverse direction, it also functions as an optical coupler that emits an optical signal incident on two or more terminals from one terminal) The present invention relates to an optical splitter module (or an optical coupler module) having a built-in function.

  In recent years, optical fiber transmission using an optical fiber wired to a subscriber's house such as a house or a building has been rapidly spread. In this type of optical fiber transmission, in order to effectively use the transmission amount of one optical fiber line, one optical fiber (one line) from the outside (station side) is branched into a plurality of optical fibers, An optical fiber is also wired to each subscriber's house. In this case, an optical splitter is used for the branch connection of the line, and it is housed in a closure (AO closure) installed in the aerial space, for example. The extra length of the optical fiber connected to the optical splitter is housed in the casing together with the optical splitter so that the wiring in the closure can be easily organized.

  For example, in the optical splitter module described in Patent Document 1, the optical splitter is housed in the housing, and the housing is provided with an adapter connected to the optical splitter and an indoor cable lead-out portion that leads out a plurality of indoor cables. The extra length of the indoor cable is housed in a state in which the indoor cable is circulated at a radius greater than the allowable bending radius. Further, the output side of the optical splitter is connected to the indoor cable via the fusion splicing part, and the fusion splicing part is covered with a fiber protection sleeve to protect it.

  The optical splitter housing described in Patent Document 2 is provided with a single-core reinforcing cord fixing portion and a multi-fiber reinforcing cord fixing portion at both ends of the optical splitter housing facing each other. The tube through which the single-core optical fiber core wire on the single-fiber side of the optical splitter is fixed is fixed, and the multi-fiber side reinforcing cord fixing portion is divided into a plurality of single-fiber separated on the multi-fiber side of the optical splitter. A plurality of tubes through which the single-core optical fibers are respectively passed are fixed, so that it is not necessary to store an extra optical fiber (extra length portion) inside the optical splitter housing.

JP 2008-268391 A JP 2008-003193 A

  As described in Patent Document 1, when an indoor cable is introduced into a housing (see Paragraph 0020 of Patent Document 1), the allowable bend radius of the cable is large, so that the module size becomes large. Further, when the fusion splicing portion is housed in the housing (see paragraph 0021 of Patent Document 1), it is necessary to keep the fusion splicing portion straight. It becomes a factor of.

  As described in Japanese Patent Application Laid-Open No. H10-228707, in the case where wiring is performed almost straight so that it is not necessary to store the extra length of the optical fiber inside the housing, the optical fiber is not formed outside the housing. In order to be able to withstand external forces such as tension, it is necessary to reinforce and code the optical fiber core wires with tensile strength fibers on both sides (single core side and multi-core side) of the optical splitter (paragraphs 0034 to 0036 of Patent Document 2 And 0041-0045). In this case, when the optical splitter housing is installed in the closure, it becomes difficult to handle an optical fiber having an optical connector attached to the tip.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical splitter module capable of downsizing the case while appropriately storing the extra length of the optical fiber inside the case.

  In order to solve the above problems, the present invention provides an optical splitter in which two or more output-side optical fibers are coupled to one input-side optical fiber, and each of the input-side optical fiber and the output-side optical fiber. An optical connector attached to an end opposite to the optical splitter; a retaining portion that collectively holds a midway portion of the input side optical fiber and the output side optical fiber; a case body and a case lid; A case in which the optical splitter and the retaining portion are housed, and the case main body includes a portion between the retaining portion and the optical connector of the input side optical fiber and the output side optical fiber. A portion between the retaining portion and the optical splitter of the input side optical fiber and the output side optical fiber is provided with a guide formed in the case body. The inner surface of the case lid is placed between the retaining portion and the optical splitter of the input side optical fiber and the output side optical fiber when covered with the case body. Provided is an optical splitter module characterized in that a rib for pressing the portion is protruded and a notch portion is provided on the guide wall portion to avoid interference with the rib.

  Further, the present invention provides an optical splitter in which two or more output-side optical fibers are coupled to one input-side optical fiber, and the input-side optical fiber and the output-side optical fiber are opposite to the optical splitter. An optical connector attached to the side end, a retaining portion that collectively holds a midway portion of the input side optical fiber and the output side optical fiber, a case body and a case lid, and the optical splitter and A case in which the retaining portion is accommodated, and the case body includes an opening through which a portion between the retaining portion and the optical connector is inserted among the input side optical fiber and the output side optical fiber. A portion of the input side optical fiber and the output side optical fiber between the retaining portion and the optical splitter is curved and bent along a guide wall portion formed in the case body. And a rib that presses a portion of the input side optical fiber and the output side optical fiber between the retaining portion and the optical splitter when the case main body is put on the inner surface of the case lid. The guide wall is provided with a rib notch for avoiding interference with the rib, and the case body is detachable from the case, and the input side optical fiber. And a holding part that holds down the portion between the retaining part and the optical splitter in the output side optical fiber is housed, and the guide wall part is for holding parts that avoid interference with the holding part. Provided is an optical splitter module provided with a notch.

In the optical splitter module of the present invention, the input side optical fiber and the output side optical fiber are all continuous from the optical splitter to the optical connector without a fusion splicing part. preferable.
A tube for reinforcing a portion between the retaining portion and the optical connector of the input side optical fiber and the output side optical fiber is fixed to the retaining portion, and the input side optical fiber and the input side optical fiber Each of the output side optical fibers is preferably inserted into the tube.
The case main body is provided with a surplus length storage area for storing surplus lengths of the input side optical fiber and the output side optical fiber according to a distance from the guide wall portion, and the surplus length storage area includes a flap. It is preferable that the pressing sheet having the optical fiber pressing portion is held.

  According to the present invention, the case can be reduced in size by binding the input side optical fiber and the output side optical fiber with a common retaining portion and pulling them out of the case through the common opening. In addition, it is possible to prevent the extra length of the optical fiber stored with a smaller bending radius in the miniaturized case from protruding from the case, improving the workability of the assembly and ensuring the extra length within the case even after assembly. Can be held in.

Since the entire optical fiber from the optical splitter to the optical connector does not have the fusion splicing portion, the case can be further reduced in size.
In the case where a tube fixed to the retaining portion is provided, the optical fibers outside the case can be easily reinforced by inserting the optical fibers connected to both ends of the splitter into the tubes.
When a sheet having a flap-shaped optical fiber holding part is provided in the extra length storage area, the extra length of each optical fiber is more reliably determined regardless of the length of the extra length (the distance from the guide wall). Can be held.

(A) is a front view which shows the external appearance which concerns on one example of the optical splitter module of this invention, (b) is a side view of a case. It is a top view which shows an example of a structure of an optical splitter. (A) is sectional drawing which follows the AA line of FIG.1 (b), (b) is a top view which shows the state which opened the cover of the case. It is sectional drawing which follows the BB line of Fig.3 (a). It is a top view of the case main body which concerns on the optical splitter module of one form example. It is a perspective view of the case main body which concerns on the optical splitter module of an example. It is a top view of a case lid concerning an optical splitter module of one form example. It is a perspective view of a case lid concerning an optical splitter module of one form example. It is drawing which shows the securing part main body which concerns on the optical splitter module of one form example, Comprising: (a) is a top view, (b) is a side view. It is drawing which shows the securing part cover which concerns on the optical splitter module of one form, Comprising: (a) is a side view, (b) is a top view, (c) is sectional drawing which follows the CC line of (b) It is. It is a perspective view which shows the holding | suppressing component which concerns on the optical splitter module of an example. It is a top view which shows an example of the assembly state of the securing part which concerns on the optical splitter module of one form example. (A) is sectional drawing which shows an example of an input side optical fiber, (b) is sectional drawing which shows an example of an output side optical fiber. It is a top view which shows an example of the assembly state of an optical fiber, an optical splitter, an optical connector, and a securing part. It is a top view which shows the pressing sheet which concerns on the optical splitter module of one form example.

The present invention will be described below based on preferred embodiments with reference to the drawings.
As shown in FIGS. 1 and 3, the optical splitter module 6 includes an optical splitter 3 housed in a case 5, an input side optical fiber 11 and an output side optical fiber 21 connected to the optical splitter 3, and Optical fibers 11, 21 are provided with optical connectors 12, 22 attached to the tips of portions drawn out of the case 5 as optical fiber cords 1, 2.
Here, “input side” and “output side” refer to a terminal (input side port) 31 on the coupling side with respect to the branching device 30 (see FIG. 2) built in the optical splitter 3 (or optical coupler). What is connected is referred to as “input side”, and what is connected to the branch side terminal (output side port) 32 is referred to as “output side”.
In the following description, instead of distinguishing by name such as the input side optical fiber cord 1, the output side optical fiber cord 2, the input side optical fiber core wire 11, and the output side optical fiber core wire 21, an appropriate code ( 1, 2 or 11, 21), and modifiers such as “input side”, “output side”, “code”, and “core” may be omitted.

  The branching device 30 is an optical splitter that emits an optical signal incident on one terminal 31 from two or more terminals 32, an optical coupler that emits an optical signal incident on two or more terminals 32 from one terminal 31, Alternatively, any of optical branching couplers having both functions may be used. That is, one input side optical fiber 11 is coupled to two or more output side optical fibers 21 via the optical splitter 3. The number of input / output terminals of the branching device 30 is preferably 1 × 4, 1 × 8, 1 × 16, etc., which can be configured by a combination of Y-branch (1 × 2) optical waveguides as shown in FIG. It is not limited to.

The optical fibers 11 and 21 exposed in the case 5 are preferably optical fiber core wires (or optical fiber strands) having an outer diameter of 0.25 mm or less, for example. Moreover, it is preferable that the part pulled out of the case 5 is reinforced as the optical fiber cords 1 and 2 (or the optical fiber cable).
The types of the optical connectors 12 and 22 attached to the tips of the input side optical fiber 1 and the output side optical fiber 2 (ends opposite to the optical splitter 3) are not particularly limited. It is possible to employ connectors, MU connectors, MT connectors, and other various optical connectors.

For example, as shown in FIG. 13A, the input side optical fiber 11 is inserted into the tube 13 outside the case 5, and the optical fiber cord 1 reinforced by longitudinally attaching the tensile strength fibers 14 in the tube 13. can do. In this case, by removing the tube 13 and the tensile strength fiber 14 in a part of the optical fiber cord 1, the case where the optical fiber core wire 11 is exposed in the case 5 can be used as the input side optical fiber. Also, as shown in FIG. 8 of Patent Document 2 (Japanese Patent Laid-Open No. 2008-003193), a configuration in which tensile strength fibers are accommodated between inner and outer double tubes and an optical fiber core wire is inserted into the inner tube. It is also possible to adopt. Examples of the tensile fibers 14 include high-strength fibers such as aramid fibers.
The input side optical fiber cord 1 preferably includes a tensile strength fiber, and the outer diameter is not particularly limited, but an outer diameter of, for example, about 1.0 to 1.7 mm is exemplified.

  For example, as shown in FIG. 13B, the output-side optical fiber 21 can be an optical fiber cord 2 that is reinforced by being inserted through a gap 24 in the tube 23 outside the case 5. In the present invention, since the extra lengths of the optical fibers 11 and 21 are accommodated in the case 5, the output-side optical fiber cord 2 may have a simple configuration that does not include tensile strength fibers, and the outer diameter is not particularly limited. However, for example, an outer diameter of about 0.7 to 0.9 mm is exemplified.

  As shown in FIG. 14, each of the input side optical fibers 1 and 11 and the output side optical fibers 2 and 21 is connected to the optical splitter 3 at one end, and the optical connectors 12 and 22 are attached to the other ends. Further, intermediate portions of the input side optical fibers 1 and 11 and the output side optical fibers 2 and 21 are collectively held by the retaining portion 4.

  In FIG. 12, the elements on larger scale of the securing part 4 are shown. In the case of this embodiment, the retaining portion 4 is configured by combining the retaining portion main body 40 shown in FIG. 9 and the retaining portion lid 50 shown in FIG. It is being fixed between the holding | maintenance part cover bodies 50 by the adhesion | attachment etc. which used the adhesive agent, for example.

The retaining portion main body 40 includes an input-side optical fiber holding groove 41 that holds the input-side optical fiber 1, an output-side optical fiber holding groove 42 that holds the output-side optical fiber 2, and the holding grooves 41 and 42. It has pin holes 43 arranged on both sides, and tensile strength fiber gripping convex portions 44. The input side optical fiber holding groove 41 and the output side optical fiber holding groove 42 are partitioned by a partition 48 so that the input side optical fiber 1 and the output side optical fiber 2 are not mixed.
The retaining portion lid 50 includes a plate-shaped base 51, a tensile strength fiber gripping convex portion 52, and a pin 53 that is fitted into the pin hole 43 of the retaining portion main body 40.

  As shown in FIG. 12, an input side optical fiber (cord) 1 in which an input side optical fiber (core wire) 11 is inserted through a tube 13 is held in an input side optical fiber holding groove 41, and an output side optical fiber ( The output side optical fiber (cord) 2 formed by inserting the core wire 21 through the tube 23 is held in the output side optical fiber holding groove 42.

In the case of this embodiment, the retaining portion lid 50 has a counterbore portion 54 (a portion where the thickness of the base 51 is locally thinned) provided at a position facing the input side optical fiber holding groove 41. The distance between the base 51 and the floor portion 47 of the retaining portion main body 40 is increased, and two input-side optical fibers 1 can be held as necessary.
The tensile strength fiber 14 vertically attached to the tube 13 together with the optical fiber 11 is folded along the curved surface 45, and the tensile strength fiber gripping convex portion 44 on the retaining portion main body 40 side and the retaining portion lid 50 side side. It is gripped between the tensile strength fiber gripping convex portions 52. As shown in FIG. 3 (b), the tongue-like portion 46 has the tensile fiber 14 (not shown in FIG. 3 (b)) along the curved surface 45 when the retaining portion 4 is accommodated in the case body 60. The protrusion is formed so as not to protrude from the case body 60.
The tube 13 is fixed to the retaining portion 4 by, for example, bonding using an adhesive or the like in order to reinforce a portion between the retaining portion 4 and the optical connector 12 in the input side optical fiber 11. The end portion of the tube 13 is exposed to the outside of the retaining portion 4 so that the input side optical fiber 11 can be inserted even after the tube 13 is fixed to the retaining portion 4.

The output side optical fiber holding grooves 42 are arranged in parallel in a direction perpendicular to the longitudinal direction of the output side optical fiber 2 (four rows in FIG. 9), and can hold a required number of output side optical fibers 2. Is possible. The output-side optical fiber 2 can be stacked in a plurality of stages (vertical direction in FIG. 9B) in the output-side optical fiber holding groove 42. For example, eight output-side optical fibers 2 have 4 rows × 2 Held in steps.
The tube 23 is fixed to the retaining portion 4 by, for example, adhesion using an adhesive or the like in order to reinforce a portion between the retaining portion 4 and the optical connector 22 in the output side optical fiber 21. The end of the tube 23 is exposed to the outside of the retaining portion 4 so that the output side optical fiber 21 can be inserted even after the tube 23 is fixed to the retaining portion 4.

As for the input side optical fiber 11 and the output side optical fiber 21, the whole from the optical splitter 3 to the optical connectors 12 and 22 is continuing, without passing through a fusion splicing part. Thereby, it is not necessary to provide a storage space for the fusion splicing portion inside or outside the case 5, and the case 5 can be downsized.
In addition, the input side optical fiber 11 and the output side optical fiber 21 are inserted between the holding portion 4 and the optical connectors 12 and 22 into the tubes 13 and 23, respectively, and the portions pulled out of the case 5 are reinforced. ing. The tubes 13 and 23 may be appropriately color-coded, and are preferably made of a flexible material such as resin or elastomer.
Further, the input side optical fiber 11 and the output side optical fiber 21 are exposed as optical fiber cores between the retaining portion 4 and the optical splitter 3. Thereby, in case 5, extra length can be stored with a smaller bending radius, and case 5 can be miniaturized.
The optical fibers 11 and 21 preferably have an allowable bending radius reduced to, for example, about 10 to 20 mm by a method for controlling the relative refractive index difference Δ between the core and the cladding.

In the case of this embodiment, the case 5 for housing the extra length portions of the input side optical fiber 11 and the output side optical fiber 21 is the case main body 60 shown in FIGS. 5 and 6, and the case shown in FIGS. And a lid 70. A boss 67 a having a pin hole 67 is formed in the case body 60, and the case lid 70 can be positioned with respect to the case body 60 by fitting each of the boss 67 a with a plurality of pins 73 provided in the case lid 70. it can.
Further, as shown in FIG. 1B, the case main body 60 is made to engage with the case main body 60 by engaging the plurality of engaging portions 74 on the case lid 70 side with the plurality of engaging convex portions 66 on the case main body 60 side. The lid 70 can be fixed and the closed state of the case 5 can be maintained. When the case 5 is opened again, the engaging portion 74 is removed from the engaging convex portion 66 and the pin 73 is removed from the pin hole 67.
The configuration for fixing the case lid 70 to the case body 60 is not particularly limited, and in addition to the above, a hinge, a magnet, or the like can be used. In this embodiment, the case main body 60 and the case lid 70 can be separated separately, but can be connected by a thin hinge or a string-like member. The case 5 can be formed using an appropriate molding material such as resin or metal.

As shown in FIGS. 5 and 6, the case body 60 has a plate-like bottom wall portion 60a and a side wall portion 60b projecting from one side around the plate-like bottom wall portion 60a, and an optical fiber on the side having the side wall portion 60b. The extra lengths 11 and 21 and the optical splitter 3 can be stored.
As shown in FIGS. 7 and 8, the case lid 70 has a substantially plate-like base 71, and the side wall 60 b of the case main body 60 is the outer shape of the base 71 except for the position of an opening 61 (described later in detail). Is formed over the entire circumference.

The case body 60 has an opening 61 through which the coded portions 1 and 2 between the retaining portion 4 and the optical connectors 12 and 22 of the input side optical fiber and the output side optical fiber are inserted. In the case of this embodiment, the opening through which the input-side optical fiber 1 is inserted and the opening through which the output-side optical fiber 2 are inserted are not separated, but are shared as one opening 61. Thereby, the opening width of the opening part 61 can be suppressed.
The case main body 60 has a region (retaining portion accommodating region) 64 in which the retaining portion 4 is accommodated in the vicinity of the opening 61. As shown in FIG. 3B, the retaining portion 4 is held by the case main body 60 even when the case lid 70 is opened by projections 64a and partition walls 64b formed around the retaining portion storage area 64. can do. In order to stabilize the position of the retaining portion 4 in the retaining portion storage area 64, a counterbore portion (not shown) is provided at the position of the retaining portion 4 on the bottom wall portion 60a and the base 71 on the case lid 70 side. Also good.

The optical splitter 3 is held in the optical splitter storage area 63 of the case body 60. In order to stabilize the position of the optical splitter 3 in the optical splitter storage region 63, a counterbore (not shown) may be provided at the position of the optical splitter 3 on the bottom wall 60a or the base 71 on the case lid 70 side.
The input side optical fiber 11 and the output side optical fiber 21 (specifically, the portions where the optical fiber core wires 11 and 21 are exposed between the retaining portion 4 and the optical splitter 3) are curved along the guide wall portion 62. It is stored in a state.
In the internal space of the case body 60, a passage (input-side passage) 63 a through which the input-side optical fiber 11 is drawn out from the optical splitter 3 and a passage (from which the output-side optical fiber 21 is drawn out from the optical splitter 3) by these guide walls 62. (Output side passage) 63b, and an extra length storage region 60c for adjusting the extra length of the optical fibers 11 and 21, and the like.

As shown in FIG. 3, the path through which the input-side optical fiber 11 is wired from the optical splitter 3 to the retaining portion 4 is, in order from the optical splitter 3 side, the input-side path 63a, the path 60e, the extra length storage area 60c, It reaches the retaining portion 4 through the passage 60d.
The path through which the output-side optical fiber 21 is wired from the optical splitter 3 to the retaining portion 4 is, in order from the optical splitter 3 side, the output-side path 63b, the path 60e, the path 60d, the extra length storage area 60c, and the path 60e. To reach the retaining part 4.
The input side passage 63a, the extra length storage area 60c, and the passage 60d have guide wall portions 62 on both sides of the route. The output side passage 63b and the passage 60e have a guide wall portion 62 only on the radially inner side of the curve, and the side wall portion 60b of the case body 60 is provided on the radially outer side.

As shown in FIGS. 7 and 8, the case lid 70 has ribs 72 protruding from the inner surface of a base 71. In FIG. 5, the position corresponding to the rib 72 is indicated by a two-dot chain line. The guide wall 62 is provided with a rib notch 62 a that avoids interference with the rib 72.
When the case lid 70 is put on the case main body 60, the rib 72 is arranged at a position crossing the passages 63a, 63b, 60d, 60e and the extra length storage area 60c in the plan view shown in FIG. . Further, in the thickness direction of the case 5, as shown in FIG. 4, the height of the space in which the optical fibers 11 and 21 such as the passages 63 a and 60 d are arranged is made smaller than the height of the guide wall 62. The optical fibers 11 and 21 (the portion between the retaining portion 4 and the optical splitter 3) in the case 5 can be surely pressed down.

In addition, as shown in FIG. 3, a holding member 80 that is detachable from the case 5 is accommodated in the case body 60. As shown in FIG. 11, the pressing member 80 has an arm 81 extending in three directions and a pin 82 that protrudes from the center and can be fitted into a pressing member pin hole 68 (see FIG. 5) of the case body 60. . The guide wall portion 62 around the presser component pin hole 68 is provided with a presser component notch 62 b that avoids interference with the presser component 80. The height of the pin hole 68 is set lower than the surrounding guide wall portion 62 so that the upper surface of the arm 81 does not protrude from the case body 60 when the holding member 80 is fitted.
The holding component 80 is attached to the case main body 60 by fitting the pin 82 into the holding component pin hole 68, and the optical fibers 11 and 21 (the retaining portion 4 and the optical splitter 3) in the case 5 by each arm 81. Can be pressed down.
Since the holding part 80 has a plurality of arms 81 as a single part, the number of parts can be reduced, and the structure for attaching the holding part 80 to the case body 60 is only one pin hole 68. 5 can be further downsized.

As shown in FIG. 3, a pressing sheet 90 having a flap-shaped optical fiber pressing portion 91 is held in the extra length storage area 60 c. As shown in FIG. 15, the optical fiber pressing portion 91 is formed by folding back a flap-shaped portion 93 of the pressing sheet 90. The protrusion 92 is engaged with the notch 62 a of the guide wall 62 to position the pressing sheet 90. In the case of this embodiment, the optical fiber pressing portions 91 are provided at two locations on both sides that serve as entrances and exits to the extra length storage area 60c.
The extra lengths of the input-side optical fiber 11 and the output-side optical fiber 21 depend on the size of the distance from the guide wall 62 on the inner circumference side of the extra-length storage region 60c (reference numeral 62c is distinguished from other parts). The length of the extra length of the optical fibers 11 and 21 can be adjusted, and even if the length of the portion between the retaining portion 4 and the optical splitter 3 is slightly different, the extra length does not occur and the extra length does not occur. The length can be stored. Each of the optical fibers 11 and 21 may pass through a position away from the inner circumferential guide wall portion 62c toward the outside in the radial direction. However, by providing the optical fiber holding portion 91, the optical fibers 11 and 21 protrude. The surplus length of each of the optical fibers 11 and 21 can be more reliably held regardless of the length of the surplus length (the distance from the guide wall 62c).
The pressing sheet 90 may be fixed to the case main body 60 with an adhesive, an adhesive, or the like.

  The guide wall portion 62 surrounded by the surplus length storage region 60c and the passages 60d and 60e is arranged in a substantially circular shape in the approximate center of the case body 60, although it is interrupted by the notches 62a and 62b. In this embodiment, when the case 5 is pinched from the outside, the dent prevention protrusion 65 for preventing the dent of the bottom wall portion 60a of the case body 60 and the base 71 of the case lid 70 is provided. There is no possibility that the engaging portion 74 is disengaged due to deformation strain or the like of the case 5.

An example of a method for assembling the optical splitter module 6 of this embodiment will be described.
As shown in FIG. 14, the middle portions of the optical fibers 11 and 21 drawn to both ends of the optical splitter 3 are bound together by the retaining portion 4, and the optical connectors 12 and 22 are attached to the tips. In order to make the cords 1 and 2 between the retaining portion 4 and the optical connectors 12 and 22, as shown in FIG. 12, between the retaining portion main body 40 and the retaining portion lid 50 of the retaining portion 4. After the ends of the tubes 13 and 23 are bonded to each other, the optical fiber core wires 11 and 21 are inserted into the tubes 13 and 23.
The extra lengths of the optical fibers 11 and 21 to which the retaining portion 4 and the optical connectors 12 and 22 are attached are accommodated in the case body 60 as shown in FIG. By using the holding member 80 and the holding sheet 90, it is possible to prevent the extra length before covering the case lid 70 from protruding onto the guide wall 62, and there is a risk that the extra length may be sandwiched between the case lid 70 and the extra length. Absent.
Further, as shown in FIGS. 1B and 3A, after the case lid 70 is put on the case body 60, the extra lengths of the optical fibers 11 and 21 are formed by the ribs 72 on the inner surface of the case lid 70. Is pressed. Therefore, the workability of assembly is improved, and the extra length can be more reliably held in the case even after assembly.

As described above, according to the optical splitter module 6 of the present embodiment, the input side optical fiber 1 and the output side optical fiber 2 are bundled together by the common retaining portion 4, and the case 5 is connected via the common opening 61. By pulling out, the case can be reduced in size.
Further, when the optical fiber cores 11 and 21 exposed in the case are stored with a considerably small bending radius of about 10 to 20 mm, for example, the optical fiber cores 11 and 21 are bent or twisted to cause the bottom wall portion of the case body 60 to be bent. In the present invention, the extra lengths of the optical fibers 11 and 21 are held down by the rib 72, the holding member 80, etc., so that the extra lengths of the optical fibers 11 and 21 can be prevented from protruding from the case. As a result, the assembling workability is improved, and the extra length can be more securely held in the case 5 even after assembling.

DESCRIPTION OF SYMBOLS 1 ... Input side optical fiber (code), 2 ... Output side optical fiber (code), 3 ... Optical splitter, 4 ... Retaining part, 5 ... Case, 6 ... Optical splitter module, 11 ... Input side optical fiber (core wire) , 12 ... Input side optical connector, 13 ... Input side tube, 21 ... Output side optical fiber (core), 22 ... Input side optical connector, 23 ... Output side tube, 60 ... Case body, 60c ... Extra length storage area , 61 ... opening, 62 ... guide wall, 62a ... notch for rib, 62b ... notch for pressing part, 70 ... case lid, 72 ... rib, 80 ... pressing part, 90 ... pressing sheet, 91 ... Flap-shaped optical fiber holding part.

Claims (5)

An optical splitter in which two or more output-side optical fibers are coupled to one input-side optical fiber, and each of the input-side optical fiber and the output-side optical fiber is attached to the end opposite to the optical splitter An optical connector, a retaining portion that collectively holds a midway portion of the input-side optical fiber and the output-side optical fiber, a case main body and a case lid, and the optical splitter and the retaining portion are accommodated With a case to be
The case body has an opening through which a portion between the retaining portion and the optical connector of the input side optical fiber and the output side optical fiber is inserted.
Of the input-side optical fiber and the output-side optical fiber, a portion between the retaining portion and the optical splitter is curvedly housed along a guide wall portion formed in the case body,
On the inner surface of the case lid, a rib is provided for pressing down a portion between the retaining portion and the optical splitter of the input side optical fiber and the output side optical fiber when the case body is covered. In addition, the guide wall portion is provided with a cutout portion that avoids interference with the rib. An optical splitter in which two or more output-side optical fibers are coupled to one input-side optical fiber, and each of the input-side optical fiber and the output-side optical fiber is attached to the end opposite to the optical splitter An optical connector, a retaining portion that collectively holds a midway portion of the input-side optical fiber and the output-side optical fiber, a case main body and a case lid, and the optical splitter and the retaining portion are accommodated With a case to be
The case body has an opening through which a portion between the retaining portion and the optical connector of the input side optical fiber and the output side optical fiber is inserted.
Of the input-side optical fiber and the output-side optical fiber, a portion between the retaining portion and the optical splitter is curvedly housed along a guide wall portion formed in the case body,
On the inner surface of the case lid, a rib is provided for pressing down a portion between the retaining portion and the optical splitter of the input side optical fiber and the output side optical fiber when the case body is covered. In addition, the guide wall is provided with a rib notch for avoiding interference with the rib,
In the case body, a holding part that is detachable from the case and that presses a portion between the retaining portion and the optical splitter of the input side optical fiber and the output side optical fiber is housed. In addition, the guide wall portion is provided with a notch portion for a pressing part that avoids interference with the pressing part. Both the input-side optical fiber and the output optical fiber, the whole from the optical splitter to the optical connector, to claim 1 or 2, characterized in that continuously without passing through the fusion splice The optical splitter module described. A tube for reinforcing a portion between the retaining portion and the optical connector of the input side optical fiber and the output side optical fiber is fixed to the retaining portion, and the input side optical fiber and the input side optical fiber Each of the output side optical fibers is inserted in the said tube, The optical splitter module of any one of Claims 1-3 characterized by the above-mentioned. The case main body is provided with a surplus length storage area for storing surplus lengths of the input side optical fiber and the output side optical fiber according to a distance from the guide wall portion, and the surplus length storage area includes a flap. optical splitter module according to any one of claims 1 to 4, characterized in that the pressing sheet is held with Jo optical fiber holding portion.

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