JP2011113011A - Optical drop cable - Google Patents

Abstract

An optical drop cable which can easily and reliably separate an optical fiber unit and an optical fiber core and which is not affected by spawning of cocoons.
Optical fiber cores are formed on both side surfaces of a jacket 16 along a boundary between optical fiber units 20 and 21, and are disposed in the respective optical fiber units 20 and 21 after separation. In the state where the optical fiber units 20 and 21 are separable from each other in a state where the optical fiber units 20 and 21 are separated from each other in a state where the optical fiber units 20 and 21 are covered with the jacket 16 so as not to be exposed. By forming each of the four corners of the cover 16 toward the center of the cross section, the optical fiber cores 14 and 15 are not positioned on the extension line and reach the vicinity of the optical fiber cores 14 and 15. And a lead-out notch 18A, 18B, 19A, 19B formed in the jacket 16 is provided.
[Selection] Figure 1

Description

  The present invention relates to an optical drop cable used for branching an optical fiber from a connection material such as a closure and drawing it into an office or a general subscriber's house.

  When an optical fiber is drawn from an aerial cable (trunk cable) installed on a utility pole to an office or a general subscriber's house, the optical drop cable (drawn cable) is used from the drop-down closure on the pole. Pulling in to the subscriber's home, etc. is performed.

  As a conventional typical optical drop cable, for example, one having a configuration as shown in FIG. 4 is known. That is, the illustrated optical drop cable 100 includes a support wire 101 made of steel wire or the like, two optical fiber cores 102a and 102b, and tension members 103a and 103b on both sides of the optical fiber cores 102a and 102b, respectively. A long cable comprising an optical fiber unit 104 provided. The optical fiber unit 104 and the support wire 101 are integrated by a jacket 105 made of flame-retardant polyethylene. The optical drop cable 100 has a cross-sectional shape having a height of about 5 mm and a width of about 2 mm, for example.

  The optical fiber unit 104 has a generally rectangular cross-sectional shape, and V-shaped notches 106A and 106B are provided on both side surfaces of the positions where the optical fiber cores 102a and 102b are disposed so as to be opposed to each other. A connecting portion 107 having a narrow width is formed at the connecting portion with the line 101. The notches 106A and 106B have, for example, an entrance width of 0.4 to 0.5 mm and a depth of about 0.5 mm. This value is set to a size that can suppress the influence of the wind pressure load.

  When the optical drop cable 100 is pulled into an office or a subscriber's house, the support wire 101 is separated from the optical fiber unit 104 outdoors by an operator, and the support wire 101 is attached to the building. Then, the optical fiber unit 104 is laid in an optical termination box (not shown) installed in the subscriber's house, and the outer cover 105 is divided into two by using a tool such as a drop separator from the notch 106A, 106B at that location. The core wires 102a and 102b are exposed. As a result, the optical fiber core wires 102a and 102b can be taken out from the jacket 105, and connection with an optical termination box (not shown) becomes possible.

  Here, when it is necessary to newly drop an optical fiber at an intermediate point of an existing FTTH (Fiber To The Home) line, the above-described conventional optical drop cable 100 has one of two cores. It seems that this can be easily handled by a so-called intermediate post-branch that branches from a predetermined place installed between the utility poles. However, in the conventional optical drop cable 100, since the optical fiber cores 102a and 102b are arranged very close to each other, the outer cover 105 is divided into two along the notches 106A and 106B. There is a problem that the outer sheath 105 for protecting the fiber cores 102a and 102b does not exist and both the optical fiber cores 102a and 102b are exposed. Also, since the optical fiber core 102a and the optical fiber core 102b are arranged close to each other, it is very difficult to separate them without damaging them, and the optical fiber cores 102a and 102b are separated during the branching operation. There is a high risk of damage. Therefore, in the conventional optical drop cable 100, branching after the middle is extremely difficult, and there is a problem that it is not possible to eliminate the follow-up work of a new optical drop cable.

  Therefore, an optical drop cable 200 as shown in FIG. 5 has also been proposed. This optical drop cable 200 removes the tension member 103a and moves the optical fiber core wire 102a to the position where the tension member 103a is provided in the optical drop cable 100 shown in FIG. Notches 108A and 108B are provided on both sides of the optical fiber core 102a, and notches 109A and 109B are provided on both sides of the optical fiber core 102b. According to this configuration, the notches 106A and 106B are used to separate the optical fiber cores 102a and 102b of the optical fiber unit 104, and the notches 108A, 108B, 109A, and 109B are used to pull out the optical fiber cores 102a and 102b, respectively. By using it, it becomes possible to separate the optical fiber core wires 102a and 102b without damaging them. Examples of optical drop cables configured by connecting a plurality of optical fiber units are disclosed in, for example, Patent Documents 1 and 2.

  On the other hand, in the optical drop cable having a notch, the disconnection of the optical fiber due to the kuma-zemi is a problem. Kumazemi has the habit of laying eggs on dead trees, mistaking flame retardant polyethylene jackets as dead trees, inserting the laying tubes along the notches and laying eggs to break the optical fiber cores placed ahead of them It is known to let you. The oak laying tube has a sharp tip and is hard and is easily inserted into the notches 106A and 106B as shown in FIGS. For this reason, there are many accidents in which the optical fiber core wire is broken by the laying tube inserted through the notch. Therefore, for example, Patent Documents 3 to 6 disclose an optical drop cable in which an optical fiber core wire is not disposed in the extension line direction of the notch as a measure against this wrinkle. In addition, research has been conducted on making the outer cover material hard.

JP 2005-283664 A JP 2005-283765 A JP 2002-90595 A JP 2006-163337 A JP 2007-41337 A JP 2009-63880 A

  However, the conventional optical drop cable shown in FIG. 5 has three notches arranged on one side of the jacket 105, and it is difficult to distinguish which notch corresponds to the optical fiber unit or the optical fiber core, so that the workability is not good. . The same applies to the cited document 3. Further, since no tension member is disposed on the side of the optical fiber core 102a, the protection of the optical fiber core 102a is not sufficient. In this case, it is conceivable to arrange a tension member also on the side of the optical fiber core wire 102a. However, if this is done, the height of the optical fiber unit 104 (the length in the vertical direction of the optical fiber unit 104 in FIG. 5) becomes longer. There is a problem that the wind pressure received by the power source increases and the load on the utility pole increases. In addition, the optical drop cable disclosed in Patent Documents 1 and 2 has no countermeasure against wrinkles.

Therefore, the problem to be solved by the present invention is that the outer dimensions of the conventional optical drop cable are not changed, and the optical fiber core wire is not exposed even when the optical fiber core wire is branched in the middle. It is to provide an optical drop cable that is reliably protected by the outer skin.
Another problem to be solved by the present invention is to provide an optical drop cable that can be easily and reliably pulled down at the midpoint of the FTTH line.
Furthermore, the problem which this invention should solve is providing the optical drop cable which can prevent the disconnection damage of the optical fiber core wire by spawning of a cocoon.

  In order to achieve the above object, according to the present invention, an optical fiber unit formed by arranging an optical fiber core wire and a tension member in parallel is arranged so that the optical fiber core wires face each other. A plurality of optical fiber cables that are arranged in parallel and that are coated with a plurality of optical fiber units integrally with a jacket, are formed on both side surfaces of the jacket along the boundary between the respective optical fiber units. In addition, a separation notch formed so that each optical fiber unit can be separated from each other in a state where it is covered with an outer sheath so that the optical fiber core line disposed in each optical fiber unit after separation is not exposed, and an optical drop On the extension line by forming the cable from the corners of the four corners of the substantially rectangular cross-section of the cable toward the center of the cross-section Characterized in that it is constituted by a core wire drawer notch formed in the jacket and then to reach the vicinity of the optical fiber without optical fiber is positioned in.

  In order to achieve the above object, according to a second aspect of the present invention, in the optical drop cable according to the first aspect, the tension members and the optical fiber core wires provided in the plurality of optical fiber units are respectively positioned on a straight line. Thus, it is characterized by being integrated.

  In order to achieve the above object, according to a third aspect of the present invention, there is provided an optical drop cable according to the first or second aspect, wherein the notch for pulling out the core wire is the end of the optical fiber unit to which the corner belongs. The optical fiber is refracted in the direction of the core wire.

  In order to achieve the above object, the present invention according to claim 4 is an optical fiber unit formed by arranging optical fiber cores and tension members in parallel so that the optical fiber cores face each other. In an optical drop cable that is arranged in parallel and further covers a plurality of optical fiber units integrally with a jacket, a substantially rectangular cross-sectional shape of the optical drop cable along the boundary between each optical fiber unit Are formed obliquely toward the center of the cross section from the two opposite corners of the outer sheath of the outer sheath of the outer sheath of the outer sheath so that the optical fiber cores arranged in each optical fiber unit after separation are not exposed. Each optical fiber unit is covered with a separation notch formed so as to be separable from each other, and each optical fiber core wire is opposed to each other. Characterized in that the inner surface of the envelope sides and separating notch position is constituted by a core wire drawer notch formed respectively.

  In order to achieve the above object, the present invention according to claim 5 is the optical drop cable according to claim 4, wherein the tension members and the optical fiber core wires provided in the plurality of optical fiber units are arranged eccentrically, Each optical fiber unit divided by the separation notch has a substantially triangular cross-sectional shape, and is integrated by a connecting portion formed at the tip of the separation notch.

  In order to achieve the above object, according to a sixth aspect of the present invention, in the optical drop cable according to any one of the first to fifth aspects, the notch for separation and the notch for drawing out the core wire have a cross-sectional shape at the tip. It is characterized by having a substantially V-shaped side gradually narrowing.

  In order to achieve the above object, according to a seventh aspect of the present invention, there is provided the optical drop cable according to any one of the first to sixth aspects, wherein the support wire is further integrally coated with the outer cover. It is characterized by.

According to the optical drop cable according to the present invention, since the separated optical fiber core wire is protected by the outer sheath and functions as a single optical drop cable, it is necessary to newly drop the optical fiber at the intermediate point. Even in this case, branching after the middle is possible. Accordingly, there is no need to follow a new optical fiber drop cable, and there is an effect that the cable laying cost can be reduced and the construction period can be shortened.
Further, according to the optical drop cable of the present invention, the separation notch and the core wire drawing notch can be easily distinguished, so that the separation from the optical fiber unit and the removal of the optical fiber core wire can be performed easily and reliably. There is an effect that can be.
In addition, since the same external dimensions as the conventional optical drop cable can be secured, the influence of the wind pressure on the optical drop cable is the same as before, and therefore no extra load is applied to the utility pole. There is an effect.
Furthermore, the optical drop cable according to the present invention can be prevented from being affected by spawning of cocoons.

It is sectional drawing which shows 1st Embodiment of the optical drop cable which concerns on this invention. (A) and (b) are the figures explaining the middle after branch of an optical drop cable. It is sectional drawing which shows 2nd Embodiment of the optical drop cable which concerns on this invention. It is sectional drawing which shows the conventional optical drop cable. It is sectional drawing which shows the other conventional optical drop cable.

  Hereinafter, preferred embodiments of an optical drop cable according to the present invention will be described with reference to the drawings.

[First Embodiment]
(Configuration of optical drop cable)
First, a first embodiment of an optical drop cable according to the present invention will be described. FIG. 1 is a sectional view showing a first embodiment of an optical drop cable according to the present invention. The illustrated optical drop cable 1 covers a support wire 10 formed of a steel wire (for example, 1.2 mmφ) as a support medium when installed between utility poles, and an outer surface of the support wire 10 with a predetermined thickness. A coating 11 formed of a synthetic resin such as flame retardant polyethylene, first and second tension members 12 and 13 formed of FRP (glass fiber reinforced plastic) or the like, a first tension member 12 and a second tension member 12 The first and second optical fiber core wires 14 and 15 disposed between the tension member 13 and the first and second tension fiber members 12 and 13 and the first and second optical fiber core wires 14. , 15 and a rectangular outer casing 16 made of flame-retardant polyethylene integrally joined to a coating 11 covering the support wire 10 by a narrow-width connecting portion 160, and a cross section of the outer casing 16 V-shaped first and second notches (separating notches for first and second optical fiber units 20 and 21 to be described later) 17A and 17B, which are provided on both sides of the central portion of the first and second portions to form a connecting portion 161. The third and fourth notches 18A and 18B in the shape of long grooves formed from the four corners of the outer cover 16 toward the center of the cross section in the substantially rectangular cross-sectional shape, and the other corners of the outer cover 16 in the same manner Long groove-like fifth and sixth notches 19A and 19B provided toward the center of the cross section. The size of the optical drop cable 1 can be configured with the same external dimensions of 2 mm × 5 mm (width × height) as the conventional optical drop cable.

  In FIG. 1, the upper half of the jacket 16 including the first tension member 12 and the first optical fiber core wire 14 forms the first optical fiber unit 20, and the second tension member 13 and the second tension member 13 The lower half of the jacket 16 including the optical fiber core wire 15 forms a second optical fiber unit 21. Accordingly, the first and second notches 17 </ b> A and 17 </ b> B are formed on both side surfaces of the jacket 16 along the boundary between the first optical fiber unit 20 and the second optical fiber unit 21. The first and second tension members 12 and 13 and the first and second optical fiber cores 14 and 15 provided in the first and second optical fiber units 20 and 21 are positioned on a straight line. In this way it is united. Furthermore, the optical fiber core wires 14 and 15 respectively arranged in the first and second optical fiber units 20 and 21 after separating the first optical fiber unit 20 and the second optical fiber unit 21 are exposed. In order not to be formed, they are formed so as to be separated from each other in a state where they are covered with a jacket 16.

  The first and second optical fiber core wires 14 and 15 are, for example, ultraviolet curable resin-coated single-core optical fibers. In some cases, the periphery is coated with a silicone resin, an ultraviolet curable resin, a thermoplastic elastomer, or the like.

  The jacket 16 is integrated with the coating 11 by, for example, extruding a synthetic resin material such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer or the like. Can be manufactured. The third and fourth notches 18A and 18B and the fifth and sixth notches 19A and 19B are pull-out notches for taking out the optical fiber core wires 14 and 15, and the leading ends thereof are the first and second notches, respectively. The first and second optical fiber cores 14 and 15 can be pulled out by peeling off the jacket 16 along the pull-out notch.

  Here, the third and fourth notches 18A and 18B and the fifth and sixth notches 19A and 19B do not have the optical fiber cores 14 and 15 positioned on the extended lines, and the optical fiber core 14 , 15 so as to reach the vicinity. Further, the distal ends of the third and fourth notches 18A and 18B and the fifth and sixth notches 19A and 19B are formed by being refracted so as to face the optical fiber cores 14 and 15, respectively. As a result, even if the oviposition tube of the burdock is inserted into the third and fourth notches 18A and 18B or the fifth and sixth notches 19A and 19B and directly breaks through the outer cover 16, the optical fiber core is placed on the extension line. Since the wires 14 and 15 are not arranged, there is no possibility of causing a disconnection accident.

(Branch after the middle of the optical drop cable)
Next, intermediate post branching to the optical drop cable 1 will be described. 2 (a) and 2 (b) are explanatory diagrams of an intermediate rear branch of the optical drop cable. Hereinafter, referring to FIGS. 1 and 2 (a) and 2 (b), the optical drop cable to the new subscriber house 31 is shown. A case where 1 is pulled in by an intermediate rear branch will be described. First, FIG. 2A shows a state in which the optical drop cable 1 is laid between the utility poles A, B, and C, and the optical drop cable 1 is drawn into the preceding subscriber house 30. In this case, both the first optical fiber unit 20 and the second optical fiber unit 21 are drawn into the preceding subscriber's house 30, but only the first optical fiber unit 20 is used. .

  In the state shown in FIG. 2A, when a new subscriber appears between the utility poles BC, the second optical fiber unit 21 is pulled into the new subscriber home 31. That is, the first optical fiber unit 20 and the second optical fiber unit at a predetermined position using the first notch 17A and the second notch 17B of the optical drop cable 1 laid between the utility poles A and B. 21. The separated second optical fiber unit 21 is cut, and the optical fiber core wire 15 is exposed by the fifth notch 19A and the sixth notch 19B. The optical fiber core 15 of the exposed second optical fiber unit 21 and the optical fiber core (not shown) of the pull-in optical drop cable 37 for pulling into the new subscriber's house 31 are optically connected within the closure 35. I do. As a result, the optical fiber cable can be drawn into the new subscriber house 31 without chasing.

(Effects of the first embodiment)
According to the optical drop cable 1 according to the first embodiment, the third and fourth notches 18A and 18B and the fifth and sixth for taking out the first and second optical fiber core wires 14 and 15 are used. Notches 19A and 19B are provided at the corners, while first and second notches 17A and 17B for separating the first optical fiber unit 20 and the second optical fiber unit 21 are provided at the sides. The length from the first notch 17A to the third notch 18A and the length from the first notch 17A to the fifth notch 19A, as well as the length from the second notch 17B to the fourth notch 18B. In addition, the length from the second notch 17B to the sixth notch 19B can be secured long, thereby balancing the amount of the coating 16 of the first optical fiber unit 20 and the second optical fiber unit 21 after separation. well Ri, the separation work is easy to perform. Further, the visibility of the first optical fiber unit 20 and the second optical fiber unit 21 is improved, and it is possible to reliably perform the work without mistaking it as a notch for other applications.

  Further, even when the spider has inserted the oviduct into the first to sixth notches 17A, 17B, 18A, 18B, 19A, 19B, the first and second optical fiber core wires 14, Since 15 does not exist, disconnection of the first and second optical fiber core wires 14 and 15 due to wrinkles can be prevented.

  The optical drop cable 1 has a two-core structure including the first and second optical fiber cores 14 and 15 and the first and second tension members 12 and 13, but the size is 2 mm × the same as the conventional one. The load on the utility pole due to the wind pressure received by the optical drop cable 1 can be suppressed as in the conventional case.

[Second Embodiment]
(Configuration of optical drop cable)
Next, a second embodiment of the optical drop cable according to the present invention will be described. FIG. 3 is a sectional view showing a second embodiment of the optical drop cable according to the present invention. The illustrated optical drop cable 2 has the first and second tension members 12 and 13 arranged at diagonal positions of the outer cover 16 in a substantially rectangular cross section in the optical drop cable 1 of the first embodiment described above. In addition, the first and second optical fiber core wires 14 and 15 are disposed on the inner side in the height direction (vertical direction in FIG. 3) of the outer cover 16 with respect to the first and second tension members 12 and 13. Along the boundary between the first and second optical fiber units 20, 21, from the two opposite corners of the four corners of the jacket 16 in the substantially rectangular cross-sectional shape of the optical drop cable 2 toward the center of the cross-section. The ninth and tenth notches (separation notches for the first and second optical fiber units 20 and 21) 23A and 23B formed obliquely are formed between the ninth and tenth notches 23A and 23B. Is the connecting part 1 On the other hand, the side surfaces of the outer cover 16 and the inner side surfaces of the ninth and tenth notches 23A and 23B, which are opposed to each other with the first and second optical fiber cores 14 and 15 interposed therebetween, are respectively provided. The eleventh and twelfth notches 24A and 24B and the seventh and eighth notches 22A and 22B, which are notches for drawing a core wire having a V-shaped cross section, are formed, and other configurations are the same as those of the first embodiment. It is almost the same. A first optical fiber unit 20 positioned on the left side in FIG. 3 is formed by the ninth and tenth notches 23A and 23B, and a second optical fiber unit 21 positioned on the right side in FIG. 3 is formed. . The first and second optical fiber cores 14 and 15 are covered with the outer cover 16 so that they are not exposed even after the first and second optical fiber units 20 and 21 are separated. , Are disposed in the second optical fiber units 20 and 21.

  As described above, the optical drop cable 2 includes the first and second tension members 12 and 13 and the first and second optical fiber cores 14 and 14 provided in the first and second optical fiber units 20 and 21. The optical fiber units 15 are arranged eccentrically with each other, and each optical fiber unit divided by the separation notch has a substantially triangular cross section, and is formed at the tip of the ninth and tenth notches 23A and 23B which are separation notches. The unit 162 is integrated.

  The ninth and tenth notches 23A and 23B have V-shaped eleventh and twelfth notches 24A formed in the tip side so as to face the first and second optical fiber cores 14 and 15, respectively. , 24B are provided. The eleventh and twelfth notches 24A and 24B separating the first and second optical fiber units 20 and 21 respectively by the ninth and tenth notches 23A and 23B are exposed to the outside. It becomes easy to make a crack in the direction of the optical fiber core wires 14 and 15. The seventh and eighth notches 22A and 22B and the eleventh and twelfth notches 24A and 24B function as lead-out notches for the first and second optical fiber core wires 14 and 15, respectively.

  The optical drop cable 2 is formed by twisting the second optical fiber unit 21 by hand with respect to the first optical fiber unit 2 or cutting the connecting portion 162 with a dedicated tool. Thus, the second optical fiber unit 21 can be separated. Further, when a force is applied by hand from the seventh notch 22A to the eleventh notch 24A or the jacket 16 is cut by a dedicated tool, the first optical fiber 14 can be pulled out. Similarly, the second optical fiber core wire 15 can be pulled out by applying force by hand from the eighth notch 22B to the twelfth notch 24B or cutting the jacket 16 with a dedicated tool. Further, when the force is applied by hand or the connecting portion 160 is cut by a dedicated tool, the support wire 10 and the first and second optical fiber units 20 and 21 can be separated. In addition, since the construction method of this Embodiment is substantially the same as 1st Embodiment, the description is abbreviate | omitted.

(Effect of the second embodiment)
According to the optical drop cable 2 in the second embodiment, the number of notches can be reduced as compared with the first embodiment, and the separation positions of the first optical fiber unit 20 and the second optical fiber unit 21 can be reduced. The drawing positions of the first and second optical fiber core wires 14 and 15 can be made clearer. In addition, the same effects as those of the first embodiment can be obtained.

[Other embodiments]
The present invention is not limited to the above embodiments, and various modifications can be made without departing from or changing the technical idea of the present invention. For example, although two examples of the optical fiber unit are shown, two or more may be used.

DESCRIPTION OF SYMBOLS 1 Optical drop cable 2 Optical drop cable 10 Support line 11 Coating | cover 12 1st tension member 13 2nd tension member 14 1st optical fiber core wire 15 2nd optical fiber core wire 16 Outer sheath 17A 1st notch 17B 2nd notch 18A 3rd notch 18B 4th notch 19A 5th notch 19B 6th notch 20 1st optical fiber unit 21 2nd optical fiber unit 22A 7th notch 22B 8th notch 23A 8th 9 notches 23B 10th notch 24A 11th notch 24B 12th notch 30 Predecessor's house 31 New subscriber's house 35 Closure 160 Connection part 161 Connection part 162 Connection part

Claims (7)

A plurality of optical fiber units formed by arranging optical fiber cores and tension members in parallel are arranged in parallel so that the optical fiber cores face each other, and further, the plurality of optical fiber units In an optical drop cable that is integrally covered with a jacket,
The outer cover is formed on both side surfaces of the jacket along the boundary between the optical fiber units, and the optical fiber cores arranged in the separated optical fiber units are not exposed. A notch for separation formed such that each of the optical fiber units can be separated from each other in a state of being coated with,
The optical fiber core wire is not positioned on the extension line by forming from the corners of the four corners of the jacket in the substantially rectangular cross-sectional shape of the optical drop cable, and the optical fiber is not positioned on the extension line. A notch for drawing out the core wire formed in the outer jacket so as to reach the vicinity of the core wire,
An optical drop cable characterized by comprising: The optical drop cable according to claim 1.
An optical drop cable, wherein the tension members and the optical fiber core wires provided in a plurality of the optical fiber units are integrated so as to be positioned on a straight line. The optical drop cable according to claim 1 or 2,
The optical fiber drop cable characterized in that the core wire drawing notch is refracted in the direction of the optical fiber core of the optical fiber unit on the side to which the corner portion belongs. A plurality of optical fiber units formed by arranging optical fiber cores and tension members in parallel are arranged in parallel so that the optical fiber cores face each other, and further, the plurality of optical fiber units In an optical drop cable that is integrally covered with a jacket,
Along the boundary between the respective optical fiber units, the optical drop cable is formed obliquely from the two opposite corners of the jacket in the substantially rectangular cross-sectional shape toward the center of the cross-section. A separation notch formed so that the optical fiber units can be separated from each other in a state of being covered with the jacket so that the optical fiber cores arranged in the optical fiber units after separation are not exposed;
Core wire drawing notches formed respectively on the side surface of the jacket and the inner side surface of the separation notch at positions facing each other across the optical fiber core wires;
An optical drop cable characterized by comprising: The optical drop cable according to claim 4,
The tension members and the optical fiber cores provided in a plurality of the optical fiber units are arranged eccentrically, and each of the optical fiber units separated by the separation notches has a substantially triangular cross-section, and the separation members An optical drop cable characterized by being integrated by a connecting portion formed at the tip of a notch. The optical drop cable according to any one of claims 1 to 5,
An optical drop cable characterized in that the separating notch and the core wire drawing notch have a substantially V-shaped cross-sectional shape with the tip side gradually narrowed. The optical drop cable according to any one of claims 1 to 6,
Further, the optical drop cable is characterized in that the support wire is formed so as to be integrally covered with the jacket.

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