JP5651740B2 - Optical fiber tape and optical fiber cable - Google Patents

Description

  The present invention relates to an optical fiber cable by high-density mounting capable of efficiently connecting an optical fiber tape and a single-core coated optical fiber, which are components of information wiring using optical fibers in the outdoors and indoors.

  Currently, with the increase in broadband services, the number of FTTH subscribers using optical fibers is rapidly increasing. As a result, there is currently a shortage of space for installing additional optical fiber cables. Under such circumstances, in order to economically construct an optical fiber network, it is important to make effective use of existing infrastructure. For this reason, it is effective to further reduce the diameter, weight, and density of the optical fiber cable.

  In order to reduce the diameter, weight, and density of optical fiber cables, the optical fiber tape has a resin part that bonds only two adjacent optical fiber cores, and the resin part is connected to the longitudinal direction of the optical fiber. An optical fiber cable in which an optical fiber tape provided intermittently is mounted has been proposed (see Patent Document 1).

  However, if the optical fiber tape with the resin part is separated from the single fiber, the resin part remains in the longitudinal coating of the optical fiber after separation. There is a problem that the subsequent optical fiber core wire cannot be firmly grasped and is caught when inserted into the field-installed connector ferrule, so that it cannot be accurately inserted. In addition, when single-core separation is performed on the optical fiber tape core having a high density, the coloration applied to the conventional single-core coated optical fiber has low identification, so that it is not possible to perform efficient connection work. there were.

JP 2010-8923 A

“Ultra-thin high-density optical fiber cable using 20-fiber intermittently bonded optical fiber tape” IEICE Technical Report 109 (428), 23-26, 2010-02-26 http://www.moritex.co.jp/products/opt/optical-fiber-array.php “Examination of reliability of optical fiber fusion reinforcement part” The Institute of Electronics, Information and Communication Engineers Paper Vol. J66-BNo.5, (1983)

  As described above, when the optical fiber tape having the conventional resin portion is separated from the single core, the resin portion remains in the longitudinal coating of the optical fiber core wire after separation, so that the optical fiber tape at the time of fusion splicing is used. There has been a problem that the optical fiber core after separation cannot be firmly held by the fiber tape holder, and it is caught when inserted into the field-installed connector ferrule, so that it cannot be accurately inserted. In addition, when single-core separation is performed on the optical fiber tape core having a high density, the coloration applied to the conventional single-core coated optical fiber has low identification, so that it is not possible to perform efficient connection work. there were.

  The present invention has been made paying attention to the above circumstances, and the purpose of the present invention is that when a single core is separated, a resin portion may remain in the longitudinal coating of the separated optical fiber. It is another object of the present invention to provide an optical fiber tape and an optical fiber cable that can be efficiently connected by improving discrimination when a single core is separated.

The optical fiber tape according to the present invention has the following configuration.
(1) An optical fiber tape in which three or more single-core coated optical fibers each independently coated on the outer periphery of the optical fiber are arranged in parallel, and the coating of each of the single-core coated optical fibers is Over the entire length, adjacent single-core coated optical fibers are composed of an ultraviolet curable resin having a function of adhering the coating itself as an adhesive, and between the two single-core coated optical fibers adjacent to each other. The adhesive portions bonded by the ultraviolet curable resin are formed so as to be two-dimensionally arranged in the longitudinal direction and the width direction, and the adhesive portions adjacent to each other in the width direction of the single-core coated optical fiber are in the longitudinal direction. to separate from each other are intermittently arranged, said ultraviolet curing resin constituting the single-core coated optical fibers of each coating is colored, and the adhesive portion of each single-core coated optical fiber adjacent And aspects resin constituting the covering are mixed.

( 2 ) In the configuration of (1), the bonding portion further has a color different from the coloring of the resin constituting the coating of the adjacent single-core coated optical fiber.
( 3 ) In the configuration of (1), when a part of the resin constituting the coating of the single-core coated optical fiber is colored and the optical fibers are arranged in a planar shape, the coloring is performed on the optical fiber. It is set as the aspect which made only the arrangement surface side.

The optical fiber cable according to the present invention has the following configuration.
(6) A plurality of optical fiber tapes according to any one of (1) to (5) are twisted together, a plurality of tape-like materials are arranged on the outer periphery to form an optical cable core, and an outer jacket material is formed on the outer periphery. It is set as the aspect covered with cable.

  (7) A plurality of optical fiber tapes according to any one of (1) to (5) are straightened or twisted, and an identification yarn is wound around the outer periphery to form an optical fiber unit. A plurality of tape-like materials are arranged on the outer periphery thereof to form an optical cable core, and an outer cover material is covered on the outer periphery to form a cable.

  (8) A plurality of optical fiber tapes according to any one of (1) to (5) are accommodated in a slot rod formed on an optical cable core, the optical cable core is pressed and wound, and a jacket is placed on the outer periphery thereof. Covered and cabled.

The optical fiber tape according to the present invention includes an adhesive part that adheres only two adjacent single-core coated optical fibers, and has a structure in which the adhesive part is two-dimensionally arranged in the longitudinal direction and the width direction. The bonding portion is formed by the ultraviolet curable resin itself constituting the coating of each single-core coated optical fiber. Further, the ultraviolet curable resin on one side is colored with respect to a plane passing through the central axis of the optical fiber of the tape core.

  As a result, even when the single core is separated, since there is no protrusion due to the residual resin portion in the longitudinal direction of the optical fiber as in the prior art, each core wire in the optical fiber holder can be gripped uniformly, Further, it is possible to normally assemble the connector without causing any catch at the time of manufacturing the connector. Further, by coloring only one surface, it is possible to identify the front and back sides of the tape core wire, thereby enabling efficient connection work.

  In short, according to the configuration of the present invention, when the single core is separated, the resin portion does not remain in the longitudinal coating of the optical fiber core wire after separation, and the discriminability when the single core is separated is improved, It is possible to provide an optical fiber tape and an optical fiber cable that enable efficient connection work. In particular, by using the present invention, it is possible to efficiently connect the optical fiber tape and the single-core coated optical fiber in the optical fiber cable in which the optical fiber tapes are gathered at a high density, thereby making the access network efficient and economical. It becomes possible to build in.

The perspective view and sectional drawing which show the structure of the optical fiber tape mounted in the optical fiber cable of patent document 1. FIG. The perspective view and sectional drawing which show the improved structure of the optical fiber tape shown in FIG. The perspective view and sectional drawing which show the structure of one Embodiment of the optical fiber tape which concerns on this invention. Sectional drawing which shows the structure of the fusion splicer which connects the optical fiber of the optical fiber tape shown in FIG. 3 collectively. Sectional drawing which shows the dimension conditions in the case of implement | achieving the optical fiber tape which can be multi-core collective connection using the fusion splicer shown in FIG. The conceptual diagram which shows a mode that a bending | flexion arises in a bare optical fiber, when performing the fusion splicing of the conventional optical fiber tape from which the space | interval of an optical fiber tape core wire differs, and the optical fiber tape of this invention. A perspective view showing a configuration of an optical fiber tape in which the resin coated on the two outermost layers adjacent to each other is mixed in an adhesive portion with respect to an optical fiber tape in which optical fibers having different colors of the resin of the outermost layer are arranged. FIG. The optical fiber tape in which the optical fibers of the outermost layer resin are arranged in different colors is mixed with the resin coated on the two outermost layers adjacent to each other in the bonding portion, and the portion exhibits a different color. The perspective view and sectional drawing which show the structure of an optical fiber tape. Sectional drawing which shows the structure of the optical fiber tape which colored a part of resin of the outermost layer of the single core coating | coated optical fiber. Sectional drawing which shows the structure of one Embodiment of the optical fiber cable which concerns on this invention formed by twisting together the optical fiber tape of the said embodiment. Sectional drawing which shows the structure of other embodiment which formed the optical fiber cable which concerns on this invention using the unit identification thread | yarn. Sectional drawing which shows the structure of other embodiment which accommodated and formed the optical fiber cable which concerns on this invention in the slot rod formed in an optical cable core.

Prior to describing embodiments of the present invention, prior art related to the present invention will be described below.
As mentioned above, it is effective to make the optical fiber cable thinner, lighter, and denser, but in order to make the optical fiber cable thinner and denser, ensure optical loss characteristics and long-term reliability. This is very important. For example, a conventional optical fiber ribbon can connect a plurality of optical fibers at once. However, since it has bending anisotropy due to its structure, for example, as disclosed in Patent Document 1, when high-density mounting is performed, optical loss increases due to local bending and large distortion occurs due to bending of the optical fiber cable. The basic characteristics of the cable cannot be satisfied. On the other hand, when a single-core optical fiber is used, the optical loss characteristic and long-term reliability are satisfied, but the workability is poor because the number of optical fiber connection operations increases, which is not preferable.

  In view of such circumstances, as described in Patent Document 1, a plurality of single-core coated optical fibers are arranged, and a resin portion that bonds only two adjacent optical fibers is intermittent with respect to the longitudinal direction of the optical fiber. An optical fiber cable which is mounted with the optical fiber tape provided in the above and has an ultimate small diameter and high density has been proposed. By adopting such a structure, an optical fiber cable having a small diameter, high density, optical loss characteristics and long-term reliability and excellent connection workability is realized.

  By the way, when constructing an access network, several types of optical fiber cables are connected, and the optical fiber is wired to each user. At this time, a multi-core optical fiber cable is used as the optical fiber cable on the communication facility building side, and the connection is mainly performed in units of optical fiber tapes. On the other hand, an optical fiber cable on the user side is a small-core optical fiber cable, and the optical fiber tape is divided and connected in units of one core. In order to construct an access network efficiently and economically, it is important to perform such connection work accurately in a short time.

  That is, when connecting in units of tapes, it is important that a large number of optical fiber tapes can be easily identified in addition to being able to accurately perform a batch connection operation. In addition, when connecting in units of one core, it is important that the optical fiber after separation can be easily identified in addition to being able to accurately connect one core. However, in the optical fiber cable described in Patent Document 1, connection work cannot be performed efficiently for the following reason.

  When performing connection in units of the tape, a batch fusion splicing technique is mainly used. When splicing optical fiber tape, sandwich the optical fiber tape with the optical fiber tape holder, pinch several centimeters from the tip of the optical fiber tape with the coating removal machine, and pull the optical fiber tape holder and the coating removal machine To remove the coating of the optical fiber tape. Thereafter, the surface of the bare optical fiber from which the coating has been removed is cleaned, further mirror-cut with an optical fiber cutter, and the entire optical fiber tape holder is set in a fusion splicer to perform fusion splicing.

  Here, in the optical fiber tape mounted on the optical fiber cable described in Patent Document 1, as shown in FIG. 1A, the resin portion that connects the two adjacent optical fibers has a longitudinal direction and a width. It is formed two-dimensionally spaced in the direction. At this time, in the resin portion, when the resin swells slightly outside the common tangent line between the adjacent optical fibers, the resin portion in the AA cross section of FIG. 1A is shown in FIG. And the non-resin part will have different tape thickness. In such a state, in the optical fiber tape holder, when the resin part and the non-resin part are sandwiched, the non-resin part is not gripped, so the coating cannot be removed normally and the connection work is not performed. There was a problem that it could not be done efficiently.

  On the other hand, when connection is made in units of one core, connection by a field assembly type connector is mainly used. This field assembly type connector includes an optical fiber ferrule, and an optical fiber is preliminarily built in the optical fiber ferrule, and this built-in optical fiber is pre-polished at the tip of the optical fiber ferrule. . Moreover, the optical fiber end part in the optical fiber ferrule is mirror-cut, and a refractive index matching agent is applied to the end face. With such a structure, a mirror-cut optical fiber is inserted from the back of the optical fiber ferrule and abutted against the end face of the built-in optical fiber, so that a connector that can be connected with low loss can be easily manufactured. .

  However, since the optical fiber tape mounted on the optical fiber cable described in Patent Document 1 has a structure as shown in FIG. 1A, when the optical fiber tape is separated into a single core, As shown in FIG. 1C, the resin may remain on the surface of the single-core coated optical fiber in the resin portion. In particular, in the BB cross section with respect to the optical fiber longitudinal direction, as shown in FIG. 1D, the resin portion remains intermittently so as to protrude in the longitudinal direction of the optical fiber. As a result, the single-core coated optical fiber is caught when inserted into the connector ferrule, the end face of the built-in fiber is not properly matched, and the connector cannot be manufactured normally.

  The above problem is, for example, that the resin portion has a different shape as shown in FIG. 2B (FIG. 1B) with respect to the optical fiber cable mounted with the optical fiber tape having the structure shown in FIG. Even if the raised portion of the adhesive portion due to the tape thickness shown is polished on a flat surface), the resin portion remains as shown in FIG. At this time, in the BB cross section with respect to the longitudinal direction of the optical fiber, as shown in FIG. 2D, the resin portion remains intermittently so as to protrude in the longitudinal direction of the optical fiber. Therefore, as long as the resin part is intermittently formed, this problem cannot be solved.

  Furthermore, in order to perform the connection work efficiently, it is necessary to identify the core wire. However, in the cable structure as described in Patent Document 1, when the number of optical fiber tapes mounted on the optical fiber cable increases, The discriminability of the fiber tape is lowered, and the time for searching for the optical fiber tape to be connected is increased, so that the connection work cannot be performed efficiently.

  In the optical fiber tape having the structure as described above, for example, as in Non-Patent Document 1, if the number of cores per tape is increased, the number of tapes mounted on the optical fiber cable is reduced, so that the discriminability is improved. Can be made. When such an optical fiber tape is separated into single cores, it may be identified by coloring each single-core coated optical fiber.

However, the number of colorings that can be easily identified is limited. Moreover, it is not preferable in manufacturing to prepare a large number of colors. For this reason, when the number of optical fiber tapes is increased, a single-core coated optical fiber having the same coloring must be present in the tape. In this case, since the discriminability in units of single cores after the tape is separated into single cores is lowered, there is a problem that connection work cannot be efficiently performed as a result.
Due to the problems as described above, the conventional technique cannot construct an access network efficiently and economically.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 3 shows the structure of an optical fiber tape according to an embodiment of the present invention. As shown in FIG. 3A, for example, four single-core coated optical fibers F are arranged on a plane. In the state, the bonding portion S is partially formed so as to bond only two adjacent single-core coated optical fibers F. The bonding portion S is two-dimensionally arranged in the longitudinal direction and the width direction, and is formed of a resin coated on the outermost layer of each single-core coated optical fiber F. Further, as shown in FIG. 3A, this optical fiber tape has a non-adhesive portion NS that is not bonded to an adjacent optical fiber, although the outermost layer of the single-core coated optical fiber F is coated with resin. Is formed.

  By adopting such a structure, in the AA cross section of FIG. 3B, the tape thickness of the bonded portion S and the non-bonded portion NS is the same as shown in FIG. 3C. For this reason, when it sets to an optical fiber holder etc., it becomes possible to hold | grip each core wire uniformly. Further, when the optical fiber tape is separated for each single-core coated optical fiber, it becomes as shown in FIG. 3 (d). In the cross section BB in the figure, as shown in FIG. In the longitudinal direction of the fiber, no protrusion or the like is generated in the bonded portion S and the non-bonded portion NS when they are connected. Further, even in the CC cross section in FIG. 3D, only the dent is generated in the bonded portion S bonded as shown in FIG. 3F, and it is normal without being caught when the connector is manufactured. It becomes possible to assemble the connector.

  The original purpose of the optical fiber tape is to connect a plurality of optical fiber tapes at once with a fusion splicer. FIG. 4 shows the configuration of the fusion splicer. In FIG. 4, the fusion splicer includes a base 11 having four V grooves V1 to V4 formed therein and V in order to align a plurality of (four in the figure) optical fibers F1 to F4 at equal intervals. And a pressing jig 12 for fixing the optical fibers F1 to F4 arranged in the grooves V1 to V4. As shown in Non-Patent Document 2, the V grooves V1 to V4 have a V groove pitch of 250 μm. When a plurality of cables are connected at once, as shown in FIG. 4, a plurality of optical fibers F1 to F4 are respectively placed at approximate positions on the V grooves V1 to V4 of the base 11, and a holding jig is used from above. By pressing at 12, the plurality of optical fibers F1 to F4 can be arranged at equal intervals.

  In order to arrange each optical fiber F1 to F4 in a predetermined V groove using such V grooves V1 to V4, the central axes of the respective optical fibers F1 to F4 are accommodated in the predetermined V groove. There is a need. For this reason, in the optical fiber tape according to the present invention, when the number of single-core coated optical fibers that perform batch connection is n, the maximum width when the single-core coated optical fibers that perform batch connection are arranged on a plane is As shown in FIG. 5, it is necessary to set (n × 250) +250 (unit: μm). At this time, the thickness t of the outermost layer coating is given as a function of the outer diameter d of the single-core coated optical fiber, and 0 <t ≦ (((n × 250) +250) −d × n) / 2n (unit Is in the range of [mu] m), an optical fiber tape capable of multi-fiber batch connection can be realized.

  When all the optical fiber tapes are connected together, the number of optical fiber cores in the tape is considered as n. Further, when a plurality of optical fiber tapes are separated and collectively connected in units of separated optical fiber tapes, the number of cores in the separated optical fiber tapes may be considered as n.

  In implementing the present invention, it is also important to ensure the reliability of the connecting portion. For example, as shown in FIG. 6, when performing fusion splicing of the conventional optical fiber tape A and the optical fiber tape B of the present invention, if the thickness of the resin coated on the outermost layer is increased, the conventional optical fiber tape The distance between the single-core coated optical fibers is different from that of the core wire. This difference in the distance becomes maximum when two optical fibers are connected at once, and the value is 250 μm. At this time, as shown in FIG. 6, the bare optical fiber is bent at the connection portion. At this time, when the length of the unbent optical fiber in the connection portion is L and L = 20 mm, the length Lb of the bent optical fiber can be obtained geometrically. The length Lb is about 1 μm longer than L. It is known that such bending at the connection point affects reliability (for example, see Non-Patent Document 3).

In the present invention, as described in Non-Patent Document 3, the stress caused by the bending of the optical fiber is small, and it can be said that sufficient reliability can be ensured.
However, regardless of the mechanical reliability as described above, the outermost layer is coated in consideration of the reliability against environmental changes such as temperature change and humidity change and the required characteristics similar to those of conventional optical fiber tape. It is also possible to reduce the thickness of the formed resin as much as possible, or to change the material of the resin coated on the outermost layer. It is also possible to change the adhesion between the resin coated on the outermost layer and the surface of the single-core coated optical fiber.

  Furthermore, it is necessary to consider manufacturability when applying the resin to be coated on the outermost layer. For the resin to be coated on the outermost layer, for example, it is desirable to use an ultraviolet curable resin as in the conventional optical fiber coating. Moreover, in order to provide a coating thickness and an adhesion part intermittently, it is desirable to adjust the physical property of resin appropriately.

  By the way, when using a some optical fiber tape core wire, the discriminability in a tape unit can be improved by coloring resin which coat | covers outermost layer for every optical fiber tape. Also, by making the coloring of the resin coated on the outermost layer of the single-core coated optical fiber different between adjacent two optical fibers, even if the single-core coated optical fiber itself is not colored, The single-core optical fiber in the optical fiber tape can be identified.

  Furthermore, the optical fiber tape in which optical fibers 1 to 4 shown in FIG. 7A are arranged in order (resin color of the outermost layer is blue, white, brown, and white in order) is adjacent to the adhesive portion. The resin coated on the outermost layers of the two matching cores are mixed together, so that the other resin that has been bonded remains after separation into a single core. For example, in the AA cross section of FIG. 7 (a), as shown in FIG. 7 (b), the opposite side brown and white resin remain in the bonding portion between No. 2 and No. 3, respectively, as shown in FIG. In the A′-A ′ cross section, as shown in FIG. 7C, the blue and white resins on the mating side remain in the adhesive part between No. 1 and No. 2, and the counterpart on the adhesive part between No. 3 and No. 4 Side white, brown resin remains. For this reason, even if there is the same coloring in the coloring of the outermost layer of the single-core optical fiber in the tape, by confirming the coloring of the resin of the adhesive portion, it is possible to confirm the core wires originally arranged on both sides, It is possible to identify the core number within the core.

  Moreover, the coloring in this adhesion part can ensure the distinguishability after isolate | separating to a single core by mixing and exhibiting another color. An example is shown in FIG. 2 adjacent to each other at the adhesive portion with respect to the optical fiber tape in which the optical fibers (the resin colors of the outermost layer are blue, white, brown, and white in order) shown in FIG. Since the resin coated on the outermost layer of the heart is mixed, when separated into a single core, the colors of both are mixed. For example, in the AA cross section of FIG. 8A, as shown in FIG. 8B, a light brown resin in which white and brown are mixed is left in the adhesive portion between No. 2 and No. 3, and FIG. In the section A′-A ′ in a), as shown in FIG. 8C, a light blue resin in which blue and white are mixed remains in the adhesive part between No. 1 and No. 2 and No. 3 and No. 4 A thin brown resin with a mixture of white and brown remains in the adhesive area. From this, the core number can be identified from the color of the bonded portion even after separation into single cores.

  Further, as shown in FIG. 9A, a part of the resin of the outermost layer of the single-core coated optical fiber may be colored. This coloring is made visible only from one side of the optical fiber tape. For example, as shown in FIG. 9B, the second and third single-coated optical fibers are bonded to the second and third. Even if the single-core coated optical fiber is twisted 180 ° together with the bonded portion and the core wire is replaced, the color changes when the optical fiber tape is viewed from one side, so that the optical fiber core wires are not arranged in a predetermined order. I understand. For this reason, it becomes possible to avoid the replacement of the core wires, and it becomes possible to accurately connect the optical fibers.

  For example, as shown in FIG. 10, a plurality of optical fiber tapes 21 having the above-described configuration are twisted, and a plurality of tape-like materials 22 are wound around the outer periphery of the optical fiber tape 21 linearly or spirally along the cable longitudinal direction. An optical fiber cable (comprising a tensile body 24 and a tear string 25) having a core and a cable jacket material 23 provided on the outer periphery thereof makes it possible to effectively use existing infrastructure and to distinguish the core wire. And an optical fiber cable that can be easily connected.

  Furthermore, in the case of a multi-fiber optical fiber cable in particular, a plurality of tape core wires 31 are straight or twisted as shown in FIG. 11 (a), and unit identification yarns colored on the outer periphery thereof as shown in FIG. 11 (b). The optical fiber unit 33 is formed by winding 32 or the like. A plurality of optical fiber units 33 are twisted, and a plurality of tape-like materials 34 are wound linearly or spirally in the longitudinal direction of the cable to form an optical cable core. 35 is an optical fiber cable (including a tensile body 36 and a tear string 37). This makes it possible to identify the optical fiber unit 33 by using the colored thread 32 even when the optical fiber unit 33 is mounted with a large number of optical fiber tapes, effectively using the existing infrastructure, and An optical fiber cable that is excellent in line identification and can be easily connected is realized.

  In addition, as shown in FIG. 12, after a plurality of core wires made of optical fiber tape 41 are accommodated in the slot rod 42, a presser winding 43 is applied to form an optical cable core, and a cable jacket 44 is applied to the outer periphery thereof. By using an optical fiber cable (having a tensile body 45 and a tear string 46) characterized by the above, it becomes possible to identify the optical fiber tape 41 for each slot even if a large number of optical fiber tapes 41 are mounted. Thus, an optical fiber cable is realized that makes effective use of existing infrastructure, has excellent core identification, and can be easily connected.

As described above, according to the configuration described in the embodiment, an optical fiber tape and an optical fiber cable capable of effectively using the infrastructure and efficiently performing the connection work at the time of constructing the access network are realized.
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some configurations may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different example embodiments may be combined as appropriate.

  F: Single-core coated optical fiber, S: Bonded portion, NS: Non-bonded portion, 11: Base, V1 to V4 ... V groove, 12: Holding jig, 21 ... Optical fiber tape, 22 ... Tape-like material, 23 ... Cable jacket material, 24 ... Tensile body, 25 ... Ripped string, 31 ... Tape core, 32 ... Unit identification thread, 33 ... Optical fiber unit, 34 ... Tape-like material, 35 ... Cable jacket material, 36 ... Tensile strength Body 37 .. tear string 41 .. optical fiber tape 42. Slot rod 43. Press winding 44. Cable jacket 45. Strength body 46.

Claims (6)

An optical fiber tape in which three or more single-core coated optical fibers each independently coated on the outer periphery of the optical fiber are juxtaposed,
The coating of each single-core coated optical fiber is composed of an ultraviolet curable resin having a function of adhering adjacent single-core coated optical fibers as an adhesive over the entire length thereof,
Between the two single-core coated optical fibers adjacent to each other, an adhesive part bonded by the ultraviolet curable resin is formed so as to be two-dimensionally arranged in the longitudinal direction and the width direction,
The adhering portions adjacent to each other in the width direction of the single-core coated optical fiber are intermittently arranged apart from each other in the longitudinal direction,
The ultraviolet curable resin constituting the coating of each single-core coated optical fiber is colored in a different color between adjacent single-core coated optical fibers ,
The optical fiber tape is characterized in that the adhesive portion is mixed with a resin constituting a coating of each adjacent single-core coated optical fiber . 2. The optical fiber tape according to claim 1 , wherein the adhesive portion further exhibits a color different from a coloring of a resin constituting a coating of the adjacent single-core coated optical fiber. When a part of the resin constituting the coating of the single-core coated optical fiber is colored and the optical fibers are arranged in a plane,
The optical fiber tape according to claim 1, wherein the coloring is performed only on the arrangement surface side of the optical fiber. A plurality of optical fiber tapes according to any one of claims 1 to 3 are twisted together,
An optical cable core is formed by arranging a plurality of tape-like materials on the outer periphery,
An optical fiber cable characterized by covering the outer periphery with a jacket material and forming a cable. A plurality of optical fiber tapes according to any one of claims 1 to 3 are straight or twisted,
An optical fiber unit is formed by winding an identification thread around the outer periphery,
A plurality of the optical fiber units are twisted together,
An optical cable core is formed by arranging a plurality of tape-like materials on the outer periphery,
An optical fiber cable characterized by covering the outer periphery with a jacket material and forming a cable. A plurality of optical fiber tapes according to any one of claims 1 to 3 are accommodated in a slot rod formed in an optical cable core,
Apply a holding roll to the optical cable core,
An optical fiber cable characterized by covering the outer periphery with a jacket and forming a cable.

Images