JP6293035B2 - cable - Google Patents

Description

  The present invention relates to a cable that can be suitably used, for example, as a structural cable in which both ends are separately fixed to a structure or a foundation.

  Conventionally, a cable as described in Patent Document 1 below is known. This cable includes a cable body constituted by a plurality of wires bundled together. At least one of the plurality of wires is a fiber built-in line in which an optical fiber extending in the cable length direction is protected by a protective tube.

JP 2007-297777 A

  By the way, in the conventional cable, there is room for improvement in improving the measurement accuracy when the strain of the optical fiber accompanying the expansion and contraction of the cable body is detected and the tension applied to the cable body is measured.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to improve the measurement accuracy of the tension applied to the cable body.

In order to solve the above problems, the present invention proposes the following means.
The cable according to the present invention includes a cable main body formed of a plurality of wires bundled together, and at least one of the plurality of wires is formed of an optical fiber extending in the cable length direction by a protective tube. A cable having a protected fiber built-in line, and a fixing portion for fixing the optical fiber and the protective tube between the optical fiber and the protective tube is spaced in the cable length direction. A plurality of openings are provided, and the fixing part is provided with a resin fixing part formed by curing a curable resin, and the resin fixing part is arranged at a tube end of the protective tube, An inflow restricting portion is provided for restricting the inflow of the curable resin from the tube end portion of the protective tube to the central portion of the protective tube positioned inward in the cable length direction from the tube end portion. Regulatory Department Characterized in that it is embedded in between the optical fiber and the protective tube.

  In this case, a plurality of adhering portions are disposed between the optical fiber and the protective tube at intervals in the cable length direction. Therefore, when tension is applied to the cable body, a portion of the optical fiber positioned between a pair of adhering portions adjacent to each other in the cable length direction (hereinafter referred to as an intermediate portion) is connected to the cable via the protective tube. Can be expanded and contracted integrally with the main body. Thereby, the intermediate part of an optical fiber can be accurately distorted based on the tension applied to the cable body.

  In this case, since the resin fixing portion is arranged at the tube end portion of the protective tube, the resin fixing portion is formed by injecting the curable resin from the tube end portion with the optical fiber inserted into the protective tube. can do.

  In this case, since the inflow restricting portion is provided in the protective tube, it is possible to restrict the flow of the curable resin into the central portion when the curable resin is injected from the tube end portion.

  The tube end portion and the center portion of the protection tube may be configured by separate members, and the inflow restricting portion may be provided at a joint portion where the tube end portion and the center portion of the protection tube are joined.

  In this case, since the inflow restricting portion is provided at the joint portion of the protective tube, the inflow restricting portion can be formed when the tube end portion and the central portion of the protective tube are joined.

  The inflow restricting portion may be formed by caulking embedded between the protective tube and the optical fiber at an edge of a central portion of the protective tube.

  In this case, for example, after inserting the optical fiber into the central portion of the protective tube and before joining the tube end portion of the protective tube to the central portion, by performing a caulking process on the edge of the central portion of the protective tube, Since the inflow restricting portion is formed, the inflow restricting portion can be easily formed.

  As the fixing portion, a sleeve fixing portion having a sleeve fitted into the protective tube and having the optical fiber fitted therein may be provided.

  In this case, since the sleeve fixing portion is provided as the fixing portion, the radial positional relationship between the protective tube and the optical fiber can be held with high accuracy by the sleeve. As a result, the intermediate portion of the optical fiber can be distorted more accurately based on the tension applied to the cable body.

  The protective tube may be divided into a plurality in the cable length direction.

  In this case, since the protective tube is divided into a plurality of parts in the cable length direction, the sleeve can be inserted into the protective tube from the divided portion of the protective tube.

  The cable according to the present invention includes a cable main body formed of a plurality of wires bundled together, and at least one of the plurality of wires is formed of an optical fiber extending in the cable length direction by a protective tube. A cable having a fiber-incorporated wire that is protected, and a pair of sockets in which both ends of the cable body are inserted separately, and the socket is filled with the end of the cable body and the socket. A filler that adheres, and the optical fiber is exposed from the protective tube in the portion of the fiber built-in line that is located in the socket, and the filler fixes the optical fiber and the socket. It is characterized by.

  In this case, the filler fixes the optical fiber and the socket. Therefore, when tension is applied to the cable body from the pair of sockets, the entire optical fiber can be expanded and contracted integrally with the cable body. Thereby, the whole optical fiber can be accurately distorted based on the tension applied to the cable body.

  According to the cable of the first aspect, the intermediate portion of the optical fiber can be accurately distorted based on the tension applied to the cable body. Therefore, the tension applied to the cable body can be measured with high accuracy from the strain of the optical fiber.

According to the cable of the first aspect , the resin fixing portion can be formed by injecting the curable resin from the end portion of the tube with the optical fiber inserted into the protective tube. Therefore, the cable can be easily manufactured easily.

According to the cable of the first aspect , when the curable resin is injected from the tube end portion, it is possible to restrict the curable resin from flowing into the central portion. Therefore, the cable can be more easily manufactured.

According to the cable of the second aspect , the inflow restricting portion can be formed when the tube end portion and the central portion of the protective tube are joined. Accordingly, the cable can be made even easier to manufacture.

According to the cable of the third aspect , the inflow restricting portion can be easily formed. Therefore, the cable can be made easier to manufacture.

According to the cable of the fourth aspect , the intermediate portion of the optical fiber can be distorted more accurately based on the tension applied to the cable body. Therefore, the tension applied to the cable body can be measured with high accuracy from the strain of the optical fiber.

According to the cable which concerns on Claim 5 , a sleeve can be penetrated in a protection tube from the part divided | segmented in the protection tube. Therefore, the cable can be easily manufactured easily.

According to the cable of the sixth aspect , the entire optical fiber can be accurately distorted based on the tension applied to the cable body. Therefore, the tension applied to the cable body can be measured with high accuracy from the strain of the optical fiber.

It is the schematic of a structure provided with the cable which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the cable shown in FIG. It is a cross-sectional view of the cable shown in FIG. It is a perspective view of the principal part of the fiber built-in line which comprises the cable shown in FIG. It is a partial longitudinal cross-sectional view of the principal part of the protective tube which comprises the fiber built-in line shown in FIG. It is a perspective view of the optical fiber which comprises the fiber built-in line shown in FIG. It is the perspective view which expanded the principal part of the fiber built-in wire shown in FIG. It is a perspective view which shows the state which exposed the optical fiber and sleeve fixed part which comprise the fiber built-in line shown in FIG. It is a perspective view of the principal part of the optical fiber which comprises the fiber built-in line shown in FIG. It is a longitudinal cross-sectional view of the cable which concerns on 2nd Embodiment of this invention. It is a side view of the principal part of the fiber built-in line which comprises the cable shown in FIG. It is a figure explaining the manufacturing method of the cable shown in FIG. 10, Comprising: It is a figure which shows the state which penetrated the optical fiber to both the center pipe | tube and end part pipe | tube of a protective tube. It is a figure explaining the manufacturing method of the cable shown in FIG. 10, Comprising: It is a figure which shows the state which performed the caulking to the edge of the center pipe | tube of a protective tube. It is a figure explaining the manufacturing method of the cable shown in FIG. 10, Comprising: It is a figure which shows the state which faced | matched the both ends of the center pipe | tube and end part pipe | tube of a protection pipe. It is a longitudinal cross-sectional view of the cable which concerns on 3rd Embodiment of this invention.

(First embodiment)
Hereinafter, the cable of 1st Embodiment which concerns on this invention is demonstrated with reference to FIGS.
As shown in FIG. 1, the cable 10 is used for the structure 1, and both ends of the cable 10 are fixed to the structure or the foundation separately. In this embodiment, the cable 10 is mooring the floating body 2 (in the illustrated example, a water power generation device) as a structure to a water bottom (not shown) as a foundation, and one end of the cable 10 is fixed to the floating body 2. The other end of the cable 10 is fixed to the water bottom. A tension acts on the cable 10 when the floating body 2 is displaced on the water, and the floating body 2 as a structure and the water bottom as a foundation are relatively displaced.

As shown in FIGS. 2 and 3, the cable 10 includes a cable body 11, a pair of sockets 12, and a filler 13.
The cable body 11 is composed of a plurality of wires 14 bundled together. The outer diameters of the plurality of wires 14 are equal to each other, and the cable body 11 is an aggregate (strand) made up of these wires 14. In the present embodiment, a parallel wire strand (PWS: Parallel Wire Strand) type is adopted as the cable body 11.

  The cable body 11 includes a steel wire 15 (wire) and a fiber built-in wire 16 as a plurality of wires 14. In the present embodiment, one fiber built-in line 16 is provided. The fiber built-in line 16 is disposed on the central axis of the cable body 11 and extends straight along the cable length direction D which is the direction of the central axis.

The steel wire 15 is an elongated wire having a circular cross-sectional shape. As the steel wire 15, for example, a galvanized steel wire 15 which is a steel material whose outer peripheral surface is covered with zinc (Zn) can be employed.
As shown in FIG. 4, the fiber built-in line 16 includes an optical fiber 17 (optical transmission line) extending in the cable length direction D and a protective tube 18, and the optical fiber 17 is inserted into the protective tube 18 for protection. It is protected by a tube 18.

  The protective tube 18 constitutes the outline of the fiber built-in line 16. As shown in FIGS. 4 and 5, the protective tube 18 is divided into a plurality in the cable length direction D. Among the plurality of divided tubes 19 obtained by dividing the protective tube 18 in the cable length direction D, the divided tubes 19 adjacent to each other in the cable length direction D are joined to each other via a joining member 20. The joining member 20 is provided with an insertion hole 21 through which the optical fiber 17 is inserted.

  In the illustrated example, a connection screw is employed as the joining member 20. The connection screw is formed in a rod shape extending in the cable length direction D, and a male screw is formed on the outer peripheral surface of the connection screw. An internal thread is formed in the end portion of the split tube 19 in the cable length direction D. The connecting screw joins the divided pipe 19 by being screwed separately into each end part butted against each other in each divided pipe 19 adjacent in the cable length direction D.

As shown in FIG. 6, the optical fiber 17 is formed by coating a fiber body 22 having a core and a clad with a coating film 23.
As shown in FIG. 2, in the cable main body 11, a central portion located between both end portions in the cable length direction D is covered with a cylindrical covering layer 24. In this central part, the some wire 14 is twisted together. On the other hand, both ends of the cable body 11 in the cable length direction D are exposed from the coating layer 24. At both ends, the plurality of wires 14 are untwisted.

  In each socket 12, both ends of the cable body 11 are inserted separately. In the socket 12, end portions of the plurality of wires 14 that have been untwisted are disposed. The ends of the plurality of wires 14 are fixed to a fixing plate 25 fitted in the socket 12. The socket 12 is fixed (fixed) to the structure or foundation described above. For fixing the socket 12 to the structure or foundation, for example, a pin fixing method, a method using a support pressure, or the like can be employed.

  The filler 13 fixes the end of the cable body 11 and the socket 12 together. The filler 13 is filled in the socket 12. In the illustrated example, the filler 13 is filled in a space located inside the cable length direction D from the fixed plate 25 in the socket 12. The filler 13 is formed of, for example, a curable resin, specifically, a thermosetting resin. The curing temperature of the thermosetting resin is, for example, about 80 ° C. or less in consideration of the influence on the optical fiber 17. Of the plurality of wires 14, in the fiber built-in wire 16, the tube end portion of the protective tube 18 of the fiber built-in wire 16 is fixed to the filler 13.

  In the cable 10, the strain of the optical fiber 17 accompanying the expansion and contraction of the cable body 11 is detected, and the tension applied to the cable body 11 is measured. In the present embodiment, the optical fiber 17 extends outward in the cable length direction D from the fixed plate 25 and is connected to a measurement device (not shown). As the measurement apparatus, for example, a configuration is adopted in which the strain distribution of the optical fiber 17 is detected by making the light incident on the optical fiber 17 and detecting the reflected light, and the tension acting on the cable body 11 is detected from the strain distribution. Can be adopted. In such an optical fiber 17 for strain measurement, since an initial tension (tensile strain) equal to or greater than the compressive strain to be measured is given, the strain can be measured with high accuracy. On the other hand, with an optical fiber for temperature measurement, the temperature can be measured with high accuracy by slackening without applying tension.

As shown in FIGS. 7 and 8, a fixing portion 26 for fixing the optical fiber 17 and the protective tube 18 between the optical fiber 17 and the protective tube 18 is spaced in the cable length direction D. Several are arranged. In the present embodiment, a sleeve fixing portion 27 is provided as the fixing portion 26.
The sleeve fixing portion 27 includes a sleeve 28 that is fitted in the protective tube 18 and in which the optical fiber 17 is fitted. The sleeve 28 is formed in a cylindrical shape, and the outer peripheral surface of the sleeve 28 is bonded and fixed to the inner peripheral surface of the protective tube 18 with an adhesive 29.

The sleeve 28 is divided into two equal parts in the radial direction so as to form a semicircular shape when viewed from the cable length direction D. A pair of divided bodies 30 formed by dividing the sleeve 28 are a part of the optical fiber 17 along the cable length direction D as shown in FIG. 9, and the coating film 23 is removed and the fiber main body 22 is exposed. A part to be inserted is sandwiched in the radial direction.
As shown in FIG. 4, a portion of the optical fiber 17 located between the sleeve fixing portions 27 adjacent to each other in the cable length direction D (hereinafter referred to as a non-fixed portion) is fixed to the protective tube 18. Not. An FBG element 32 is provided at a non-fixed portion of the optical fiber 17, and the optical fiber 17 can detect strain (tension) by, for example, the FBG method.

  Here, when the cable 10 is manufactured, when the fiber built-in line 16 is formed, for example, as shown in FIG. 9, the fiber exposed to the outside by partially removing the coating film 23 of the optical fiber 17 first. A sleeve 28 is assembled to the main body 22, and an adhesive 29 is applied to the outer peripheral surface of the sleeve 28. After that, as shown in FIG. 7, the optical fiber 17 assembled with the sleeve 28 is inserted into the dividing tube 19 to form the sleeve fixing portion 27. Then, the split pipes 19 are joined to each other via the joining member 20 as shown in FIG.

  As described above, according to the cable 10 according to the present embodiment, a plurality of the fixing portions 26 are arranged at intervals in the cable length direction D between the optical fiber 17 and the protective tube 18. Therefore, when tension is applied to the cable body 11, a portion of the optical fiber 17 positioned between the pair of adhering portions 26 adjacent to each other in the cable length direction D (hereinafter referred to as an intermediate portion) is a protective tube. The cable body 11 can be expanded and contracted integrally via 18. Thereby, the intermediate part of the optical fiber 17 can be accurately distorted based on the tension applied to the cable body 11. Therefore, the tension applied to the cable body 11 can be measured with high accuracy from the strain of the optical fiber 17.

  Further, since the sleeve fixing portion 27 is provided as the fixing portion 26, the radial positional relationship between the protective tube 18 and the optical fiber 17 can be held with high accuracy by the sleeve 28. As a result, the intermediate portion of the optical fiber 17 can be distorted more accurately based on the tension applied to the cable body 11. Therefore, the tension applied to the cable body 11 can be measured with high accuracy from the strain of the optical fiber 17.

  Further, since the protective tube 18 is divided into a plurality of parts in the cable length direction D, the sleeve 28 can be inserted into the protective tube 18 from the divided portion of the protective tube 18. Therefore, the cable 10 can be easily manufactured.

(Second Embodiment)
Next, a cable according to a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

  As shown in FIG. 10, in the cable 40 according to the present embodiment, in the protective tube 18, between the tube end portion that is the end portion in the cable length direction D and the both tube end portions along the cable length direction D. The central part located in is comprised by another member. The protective tube 18 is divided into an end tube 41 (divided tube) constituting the tube end portion and a central tube 42 (divided tube) constituting the center portion. As shown in FIG. 11, the end pipe 41 and the central pipe 42 are joined via the joining member 20. In the present embodiment, taping that is integrally wound around the tube end portions of the end tube 41 and the central tube 42 is employed as the joining member 20.

  In this embodiment, a resin fixing portion 43 formed by curing a curable resin is provided as the fixing portion 26 in place of the sleeve fixing portion 27. The resin fixing portion 43 is disposed on the end tube 41 of the protective tube 18. A thermosetting resin is mentioned as curable resin which comprises the resin adhering part 43. FIG. The curing temperature of the thermosetting resin is, for example, about 80 ° C. or less in consideration of the influence on the optical fiber 17.

  In the present embodiment, the protective tube 18 is provided with an inflow restricting portion 44 that restricts the flow of the curable resin from the end tube 41 to the central tube 42. The inflow restricting portion 44 is provided at a joint portion of the protective tube 18 where the end tube 41 and the central tube 42 are joined. The inflow restricting portion 44 is formed by caulking embedded between the central tube 42 and the optical fiber 17 at the edge of the central tube 42.

  In this embodiment, when the cable 40 is manufactured, when the fiber built-in line 16 is formed, for example, first, as shown in FIGS. 12 and 13, the optical fiber 17 is connected to the central tube 42 of the protective tube 18. After the insertion, before the end tube 41 of the protective tube 18 is joined to the central tube 42, the inflow restricting portion 44 is formed by subjecting the edge of the central tube 42 of the protective tube 18 to coking. Thereafter, as shown in FIG. 14, the end portions of the central tube 42 and the end tube 41 are butted together and joined by the joining member 20 as shown in FIG. 11. And the resin adhering part 43 is formed by inject | pouring curable resin from the edge located in the outer side of the cable length direction D in the edge part pipe | tube 41, and making it harden | cure. The resin fixing portion 43 can also be formed, for example, by inserting the end of the cable body 11 into the socket 12 and fixing the end of the cable body 11 and the socket 12 via the filler 13. .

  By the way, in this embodiment, the central tube 42 located in the central tube 42 of the protective tube 18 among the optical fibers 17 is not fixed to the protective tube 18. In this optical fiber 17, for example, the FBG method or BOTDR is used. Strain (tension) can be detected by the method.

  As described above, according to the cable 40 according to the present embodiment, since the resin fixing portion 43 is disposed on the end tube 41 of the protective tube 18, the optical fiber 17 is inserted into the protective tube 18. Thus, the resin fixing portion 43 can be formed by injecting the curable resin from the end tube 41. Therefore, the cable 40 can be easily manufactured easily.

  In addition, since the inflow restricting portion 44 is provided in the protective tube 18, when the curable resin is injected from the end tube 41, it is possible to restrict the curable resin from flowing into the central tube 42. Therefore, the cable 40 can be more easily manufactured.

  In addition, since the inflow restricting portion 44 is provided at the joint portion of the protective tube 18, the inflow restricting portion 44 can be formed in accordance with the joining of the end tube 41 and the central tube 42 in the protective tube 18. it can. Therefore, the cable 40 can be manufactured more easily.

  Further, after the optical fiber 17 is inserted into the central tube 42 of the protective tube 18 and before the end tube 41 of the protective tube 18 is joined to the central tube 42, the end edge of the central tube 42 of the protective tube 18 is subjected to a caulking process. Since the inflow restricting portion 44 is formed by applying, the inflow restricting portion 44 can be easily formed. Therefore, the cable 40 can be more easily manufactured.

  In the present embodiment, the end tube 41 and the central tube 42 may not have the same diameter. For example, one of the end tube 41 and the central tube 42 has a larger diameter than the other, and the end tube 41 or the end portion of the central tube 42 having a smaller diameter has a larger diameter. Or you may insert in the edge part of the center pipe | tube 42. FIG.

(Third embodiment)
Next, a cable according to a third embodiment of the present invention will be described with reference to FIG.
Note that in the third embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

  As shown in FIG. 15, in the cable 50 according to the present embodiment, the optical fiber 17 is exposed from the protective tube 18 at a portion located in the socket 12 in the fiber built-in line 16. The filler 13 fixes the optical fiber 17 and the socket 12 together. In the present embodiment, the central portion of the optical fiber 17 located in the protective tube 18 is not fixed to the protective tube 18.

  As described above, according to the cable 50 according to the present embodiment, the filler 13 fixes the optical fiber 17 and the socket 12 together. Therefore, when tension is applied to the cable body 11 from the pair of sockets 12, the entire optical fiber 17 can be expanded and contracted integrally with the cable body 11. Thereby, the whole optical fiber 17 can be accurately distorted based on the tension applied to the cable body 11. Therefore, the tension applied to the cable body 11 can be measured with high accuracy from the strain of the optical fiber 17.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  In the embodiment, one of the plurality of wires 14 is the fiber built-in wire 16, but the present invention is not limited to this. For example, two or more of the plurality of wires 14 may be fiber built-in wires 16. In the present invention, a plurality of optical fibers may be inserted into the fiber built-in line 16, or the plurality of optical fibers may be optical fibers that detect two or more types of information different from each other. Good. For example, one may be a temperature measuring optical fiber and the other may be a strain measuring optical fiber. In this case, the plurality of optical fibers may be fixed integrally to the protective tube, or may be fixed individually.

  The measurement device may be configured to detect two or more different types of information. For example, it may be configured to be able to measure both temperature and strain information.

  The arrangement of the optical fiber 17 in the cable body 11 is not limited to the arrangement of concentric circles as shown in the above embodiment, and at least one optical fiber 17 is provided in the cables 10, 40, and 50. Just do it. Further, the configuration of the optical fiber 17, the fiber built-in line 16, the optical fiber 17 sensor, the principle of the measurement method, and the like are not limited to those exemplified in the above description, and various types can be applied.

  The structure of the cables 10, 40, and 50 is not limited to the parallel wire strand described in the above embodiment. For example, the steel wire 15 and the fiber built-in wire 16 constituting the cable body 11 do not necessarily have to be twisted together. Further, for example, a multi-strand structure, that is, a structure in which a plurality of cable main bodies 11 as shown in the embodiment are further converged into a single cord shape may be used.

  Furthermore, the present invention is not limited to the cables 10, 40, 50 used for mooring the floating body 2. For example, the cables 10, 40, 50 for suspension structures used for a suspended roof structure in a building structure may be used, and the cables 10, 40, 50 used for bridges such as cable-stayed bridges and suspension bridges may also be applied. it can. For example, bridges include those built on rivers, straits, roads, and the like.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

10, 40, 50 Cable 11 Cable body 12 Socket 13 Filler 14 Wire 16 Fiber built-in wire 17 Optical fiber 18 Protection tube 26 Adhering portion 27 Sleeve adhering portion 28 Sleeve 43 Resin adhering portion 44 Inflow restricting portion D Cable length direction

Claims (6)

Provided with a cable body composed of multiple wires bundled together,
At least one of the plurality of wires is a cable with a built-in fiber in which an optical fiber extending in the cable length direction is protected by a protective tube,
Between the optical fiber and the protective tube, a plurality of fixing portions for fixing the optical fiber and the protective tube are arranged at intervals in the cable length direction ,
As the fixing part, a resin fixing part formed by curing a curable resin is provided,
The resin fixing portion is disposed at a tube end portion of the protective tube,
An inflow restriction that restricts the curable resin from flowing from a tube end portion of the protection tube to a central portion of the protection tube that is located on the inner side in the cable length direction of the tube end portion. Part is provided,
The cable according to claim 1, wherein the inflow restricting portion is embedded between the protective tube and the optical fiber . The tube end portion and the central portion of the protective tube are constituted by separate members,
The inflow control portion, the cable according to claim 1, wherein the the pipe end portion and the central portion is provided in the joint portion joined in the protective tube. The cable according to claim 2 , wherein the inflow restricting portion is formed by caulking embedded between the protective tube and the optical fiber at an end edge of a central portion of the protective tube. As the fixing unit, with fitted in the protective tube, cable according to claim 1 or 2, characterized in that the sleeve fixing part having a sleeve in which the optical fiber is fitted to the inside is provided . The cable according to claim 4 , wherein the protective tube is divided into a plurality of pieces in the cable length direction. Provided with a cable body composed of multiple wires bundled together,
At least one of the plurality of wires is a cable with a built-in fiber in which an optical fiber extending in the cable length direction is protected by a protective tube,
A pair of sockets into which both ends of the cable body are inserted;
A filler that fills the socket and fixes the end of the cable body and the socket; and
In the portion located in the socket in the fiber built-in line, the optical fiber is exposed from the protective tube,
The cable is characterized in that the filler fixes the optical fiber and the socket.

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