JP2007212506A - Optical cable simple closure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical cable simple closure for releasing the connection even when an optical fiber is connected once. <P>SOLUTION: The optical cable simple closure 40 is provided with a cylindrical closure casing 41. The closure casing 41 has a mounting part 47 for mounting an adapter 33 inside. The mounting part 47 is formed longitudinally on the closure casing 41 in the neighborhood of a substantially intermediate point. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a simple closure for an optical cable, and more particularly to a simple closure for an optical cable that can accommodate a part of an optical fiber connected by a connector via an adapter.

  As a method of transmitting information, conventionally, a transmission method using electrical communication such as a microwave relay method or a sanitary communication method has been used, but now, it is based on optical fiber communication capable of transmitting a large amount of information at high speed. Transmission methods are becoming popular.

  Optical fiber communication is a communication method performed by transmitting information converted into an optical signal through an optical fiber. Therefore, it is possible to perform communication by optical fiber communication by installing an optical cable such as an optical drop cable between utility poles and connecting a transmission source and a reception destination. And when the number of senders and receivers is newly increased, the optical cable already installed between the utility poles is separated into the optical fiber part and the covering part, and the optical drop cable prepared separately from the optical fiber part And the optical drop cable connected to the transmission source or the reception destination.

  As for a connection method between optical fibers, for example, as disclosed in Patent Documents 1 and 2, etc., a fusion connection method, a mechanical splice connection method, and the like are often used. However, with this connection method, for example, if a wrong optical cable is mistakenly connected, the correct optical cable cannot be connected unless a method such as cutting the optical cable near the connection location is taken. Even if a communication failure occurs, similarly, the vicinity of the connection portion must be once disconnected and then the cause of the failure must be searched. From the above, it is preferable that the connection between the optical drop cables can be released.

On the other hand, Patent Document 3 discloses an optical cable connection closure for protecting a connector-connected optical drop cable. If the optical fibers are connected to each other by a connector, the connection between the optical fibers can be released by releasing the connection state between the connectors.
JP 2004-29499 A Japanese Patent Application Laid-Open No. 2004-212912 JP 2004-61713 A

  However, in the optical cable connection closure described in Patent Document 3, the cable introduction portion is installed only on one end side of the closure. Therefore, the optical fiber with the first connector is introduced from the cable introduction part and the first connector is fixed to the adapter, whereas the optical fiber with the second connector is introduced from the cable introduction part and the second connector is It is fixed to the adapter so as to face the first connector. Therefore, a large-scale optical fiber extra length processing means is required. Therefore, the closure cannot be downsized.

  This invention is made | formed in view of this point, The place made into the objective is providing the closure which can cancel | release the connection between optical fibers.

  The simple closure for an optical cable of the present invention is a closure that accommodates a connection portion between an optical fiber with a first connector and an optical fiber with a second connector. The simple closure for an optical cable has a cylindrical shape, and has a first end surface sealed so that an optical fiber with a first connector can be inserted therein and a second end surface sealed so that an optical fiber with a second connector can be inserted therethrough. And a mounting portion provided on the inner surface of the closure housing for mounting an adapter for connecting the first connector and the second connector to connect the optical fiber with the first connector and the optical fiber with the second connector. I have.

  With such a configuration, since the optical fiber is connected to the connector in the optical cable simple closure, the connection between the optical fibers can be easily released.

  The simple closure for an optical cable according to the present invention further includes a surplus length processing section that is provided in a region sandwiched between the placing section and the first end face and that processes a surplus length of the optical fiber with the first connector. A plurality of protrusions extend from the inner surface of the closure housing in the surplus length processing section, and the optical fiber with the first connector is hung on at least one protrusion and subjected to surplus length processing. In such a configuration, the surplus length processing section is provided with a plurality of protrusions, and the optical fiber with connector is subjected to surplus length processing by the plurality of protrusions. Therefore, the configuration of the surplus length processing unit is relatively simple. Therefore, it is possible to reduce the size of the simple closure for the optical cable.

  In the simple closure for an optical cable according to the present invention, some of the plurality of protrusions have a plurality of straight lines extending in a longitudinal direction of the closure housing from a portion where the optical fiber with the first connector is inserted into the first end surface. It is preferable that the protrusions are disposed on the opposite side of the remaining protrusions. In a preferred embodiment described later, adjacent protrusions are disposed on the opposite sides with respect to the straight line.

  In the simple closure for an optical cable of the present invention, the closure housing has a signal transmitted through the optical fiber with the first connector and the optical fiber with the second connector on the outer surface. It is preferable to have connection destination display means for displaying the second connection destination to exchange. With such a configuration, even after the optical cable simple closure is suspended from the electric wire, the first connection destination and the second connection destination can be known without rising to the utility pole.

  Moreover, in the simple closure for optical cables of this invention, it is preferable that the closure housing | casing has a transparent part which makes an adapter visible at least. With such a configuration, the shape and type of the first and second connectors connected to the adapter can be known without rising to the utility pole even after the optical cable simple closure is suspended from the electric wire.

  In the present invention, the connection between the optical fibers can be easily released.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to embodiment shown below.

Embodiment 1 of the Invention
In the first embodiment, a closure attached to an optical drop cable installed on a utility pole is taken as an example, and the configuration of the first and second optical drop cables 10 and 20 and a simple optical cable closure 40 are used with reference to FIGS. And the installation method of the optical cable simple closure 40 will be described. In the following, “front side” means the left side in each drawing, and “rear side” means the right side in each drawing. Further, “front side” means nearer than the paper surface of each drawing, and “back side” means deeper than the paper surface of each drawing.

  First, the structure of the 1st and 2nd optical drop cables 10 and 20 is shown using FIG. FIG. 1 is a cross-sectional view of the first and second optical drop cables 10 and 20.

  As shown in FIG. 1, the first and second optical drop cables 10 and 20 respectively include first and second cable main body portions 11 and 21, first and second support wire portions 12 and 22, And the first and second cable body portions 11 and 21 and the first and second support wire portions 12 and 22 are aligned with each other in the longitudinal direction. The first and second neck portions 13 and 23 are connected to each other. The first and second cable main bodies 11 and 21 are respectively composed of one first and second optical fiber core wires 14 and 24, first and second tension members 15 and 25, and the first and second commons. It is composed of coatings 16 and 26. The first and second tension members 15 and 25 are arranged above and below at a predetermined distance from the first and second optical fiber core wires 14 and 24, respectively, and the tension in the first and second cable main body portions 11 and 21 is applied. keep. The first and second common coatings 16 and 26 are respectively provided on the outer circumferences of the first and second optical fiber core wires 14 and 24 and the first and second tension members 15 and 25. The first and second support line portions 12 and 22 are respectively composed of first and second suspension lines 17 and 27 and first and second coverings 18 and 28, and the first and second suspension lines. First and second coatings 18 and 28 are applied to the outer peripheries of 17 and 27, respectively.

  Next, the usage example of the optical cable simple closure 40 is shown using FIG. FIG. 2 is a perspective view showing a state in which the optical cable simple closure 40 is attached to the electric wire.

  As shown in FIG. 2, the first optical drop cable 10 and the second optical drop cable 20 are installed extending in opposite directions. Near the tip of the first optical drop cable 10, the first cable body 11 is separated from the first support line 12, and the separation prevention tape 1 is wound around the separation point. Similarly, in the vicinity of the tip of the second optical drop cable 20, the second cable main body 21 is separated from the second support line portion 22, and the separation prevention tape 1 is wound around the separation point. Further, the tip end of the first support line portion 12 and the tip end of the second support line portion 22 overlap each other, and are fixed by screwing using the metal fittings 5 and 5. And the optical cable simple closure 40 is suspended via the suspension tools 3 and 3 closer to the branch point than the tapes 5.

  Then, the structure of the simple closure 40 for optical cables is shown using FIG.2 and FIG.3. FIG. 3 is a perspective view showing the inside of the simple closure 40 for an optical cable.

  As shown in FIG. 2, the optical cable simple closure 40 includes a closure housing 41.

  As shown in FIG. 2, connection destination display means A is provided on the outer surface of the closure housing 41. The connection destination display means A is a means for displaying the first connection destination and the second connection destination. The first connection destination is a destination to which signals propagated in the optical fiber 19 with the first connector exchange, and the optical fiber 19 with the first connector is connected to the first connector 31 at the end of the first cable body 11. Is attached. The second connection destination is a destination to which signals propagated in the optical fiber 29 with the second connector exchange, and the optical fiber 29 with the second connector is connected to the second connector 32 at the end of the second cable body 21. Is attached. For example, when a signal propagates from the first connection destination through the optical fibers 19 and 29 with the first and second connectors and is transmitted to the second connection destination, the first connection destination is the transmission source and the second connection destination. Is the recipient. Specifically, the outer surface of the closure casing 41 on the front side of the closure casing 41 in the longitudinal direction approximately at the midpoint is given a first color, and the closure casing 41 has a longitudinal center approximately in the longitudinal direction. Also, the second color is applied to the outer surface of the rear closure housing 41. Thereby, even if it does not open the closure housing | casing 41, if the simple closure 40 for optical cables is visually recognized, the 1st and 2nd connection destination can be known.

  Moreover, the closure housing | casing 41 is provided with the 1st member 42 and the 2nd member 43, as shown in FIG. Each of the first and second members 42 and 43 is made of a material that does not corrode, such as plastic or FRP (fiber reinforced plastics), and is formed by dividing the cylindrical member into two along the longitudinal direction. Are arranged so as to form a cylindrical shape. And the hinge part 44 has connected the 1st member 42 and the 2nd member 43 in the longitudinal direction. Thereby, the closure housing | casing 41 is formed so that opening and closing is possible via the hinge part 44, and when closed, it is cylindrical. Further, as shown in FIG. 2, an elastic body 45 is sealed at the front end face (first end face or second end face) 41a so that the optical fiber 19 with the first connector can be inserted therethrough. An elastic body 45 is sealed at the side end face (second end face or first end face) 41b so that the optical fiber 29 with the second connector can be inserted.

  As shown in FIG. 3, a placement portion 47 and first and second extra length processing portions 48 and 49 are formed on the inner surface of the first member 42.

  The placement portion 47 is formed on the inner surface of the first member 42 at a substantially midpoint in the longitudinal direction. As will be described later, the adapter 33 is placed on the placement unit 47.

  The first extra length processing section 48 is formed in front of the placing section 47, and three pins (projections) 51, 52, 53 are attached thereto. Hereinafter, the first pin 51, the second pin 52, and the third pin 53 are sequentially described in the direction from the placement unit 47 toward the front side.

  The first pin 51, the second pin 52, and the third pin 53 are virtual, extending substantially parallel to the longitudinal direction of the closure housing 41 from the portion where the optical fiber 19 with the first connector is inserted into the front end surface 41 a. The straight lines are arranged on opposite sides. Specifically, with respect to the virtual straight line, the first pin 51 is disposed on the left side, the second pin 52 is disposed on the right side, and the third pin 53 is disposed on the left side.

  The second surplus length processing unit 49 is formed on the rear side of the placement unit 47, and three pins (projections) 54, 55, and 56 are attached thereto. Hereinafter, the fourth pin 54, the fifth pin 55, and the sixth pin 56 are sequentially described in the direction from the placement portion 47 toward the rear side.

  The fourth pin 54, the fifth pin 55, and the sixth pin 56 are imaginary extending substantially parallel to the longitudinal direction of the closure housing 41 from the portion where the optical fiber 29 with the second connector is inserted into the rear end surface 41b. The straight lines are arranged on opposite sides. Specifically, with respect to the virtual straight line, the fourth pin 54 is disposed on the right side, the fifth pin 55 is disposed on the left side, and the sixth pin 56 is disposed on the right side.

  As shown in FIGS. 2 and 3, the second member 43 is formed with a transparent portion 46. The transparent portion 46 is formed in the vicinity of the midpoint of the second member 43 in the longitudinal direction. Therefore, the placement portion 47 can be visually recognized even when the closure housing 41 is closed. That is, as shown in FIG. 2, the adapter 33 can be seen by looking inside the closure housing 41 through the transparent portion 46, and as a result, the shapes and types of the first and second connectors 31 and 32 can be known.

  Further, six pins 57, 57,... Are attached to the inner surface of the second member 43. The six pins 57, 57,... Can contact the heads of the first to sixth pins 51, 52,..., 55, 56 when the closure housing 41 is closed. Are arranged as follows.

  Next, a state in which the optical fibers 19 and 29 with the first and second connectors are accommodated in the optical cable simple closure 40 will be described with reference to FIG. FIG. 4 is a perspective view showing the inside of the optical cable simple closure 40 in use.

  The adapter 33 is mounted on the mounting portion 47, the first connector 31 is connected to the adapter 33 from the front side, and the second connector 32 is connected to the adapter 33 from the rear side. Thereby, the optical fibers 19 and 29 with the first and second connectors are connected to each other via the adapter 33.

  The optical fiber 19 with the first connector is disposed on the back side of the first pin 51, and then is disposed on the front side of the second pin 52 with a gentle curve, and then on the back side of the third pin 53. It is arranged on the side and the extra length is processed. Similarly, the optical fiber 29 with the second connector is disposed on the front side of the fourth pin 54, and thereafter is disposed on the back side of the fifth pin 55 with a gentle curve, and then the sixth pin 56. It is arranged on the nearer side than that and the extra length is processed.

  Next, a method of accommodating the first and second optical drop cables 10 and 20 in the optical cable simple closure 40 will be described with reference to FIG. FIG. 5 is a process diagram showing a method of accommodating the first and second optical drop cables 10 and 20 in the optical cable simple closure 40.

  First, the worker ascends to a utility pole (not shown). Then, as shown in FIG. 5A, the first optical drop cable 10 is separated into the first cable main body 11 and the first support wire portion 12, and the second optical drop cable 20 is connected to the second cable main body 21. And the second support line portion 22 and the separation preventing tape 1 is wound around each separation point. Then, the first support line portion 12 and the second support line portion 22 are overlapped and fixed with screws using the metal fittings 5 and 5. Further, the first optical fiber core wire 14 is exposed from the end portion of the first cable main body portion 11, and the second optical fiber core wire 24 is exposed from the end portion of the second cable main body portion 21.

  Next, as shown in FIG. 5B, the suspension position of the optical cable simple closure 40 is determined, and the optical cable simple closure is attached to the first and second support wire portions 12 and 22 by using the suspension tools 3 and 3. 40 is temporarily fixed. And the simple closure 40 for optical cables is opened.

  Subsequently, as shown in FIG. 5C, the first connector 31 is attached to the end of the first optical fiber core wire 14 to form the first connector-attached optical fiber 19, and the end of the second optical fiber core wire 24. A second connector 32 is attached to the part to form an optical fiber 29 with a second connector. Then, the first and second connectors 31 and 32 are connected to the adapter 33, and the first connector-attached optical fiber 19 and the second connector-attached optical fiber 29 are connected by a connector.

  Subsequently, the optical fibers 19 and 29 with the first and second connectors connected to each other are accommodated in the closure housing 41. At this time, the adapter 33 is placed on the placement unit 47. Further, the optical fibers 19 and 29 with the first and second connectors are each accommodated in the closure housing 41 while drawing a gentle curve. Specifically, the optical fiber 19 with the first connector is disposed on the back side of the first pin 51, and is disposed on the front side of the second pin 52 with a gentle curve, and then the third pin. Arranged at the back of 53. In addition, the second connector-attached optical fiber 29 is disposed on the front side of the fourth pin 54, and is disposed on the back side of the fifth pin 55 with a gentle curve, and then the sixth pin 56. Place it on the front side. Thereby, as shown in FIG. 4, the optical fibers 19 and 29 with the first and second connectors can be accommodated in the closure housing 41.

  Subsequently, although not shown, the closure housing 41 is closed and the elastic bodies 45 are pressed into the end faces 41a and 41b of the closure housing 41, so that dust in the air is mixed into the closure housing 41. To prevent it. Then, the closure housing 41 is fixed to the first and second support wire portions 12 and 22. Thereby, the optical cable simple closure 40 can be suspended from the first and second support wire portions 12 and 22.

  As described above, the optical cable simple closure 40 of the present embodiment includes the first and second surplus length processing units 48 and 49, and each of the first and second surplus length processing units 48 and 49 includes three. The pins 51 to 53 and 54 to 56 are arranged as described above. Therefore, the optical fiber 19 with the first connector is accommodated so as to draw a gentle curve via the first to third pins 51, 52, and 53, and the extra length processing is performed. 4 through 6th pins 54, 55 and 56 are accommodated so as to draw a gentle curve and are processed for extra length. Therefore, the extra length processing of the optical fibers 19 and 29 with the first and second connectors can be performed relatively easily. Further, since the first and second surplus length processing sections 48 and 49 are only provided with three pins 51 to 53 and 54 to 56, respectively, the first and second surplus length processing sections 48 and 49 are provided. As a result, it is possible to reduce the size of the optical cable simple closure 40.

  In addition, the heads of the six pins 57, 57,... Provided on the second member 43 are the six pins provided on the first member 42 in a state where the optical cable simple closure 40 is closed. It arrange | positions so that it may contact | abut with the head of 51,52, ..., 55,56. Thereby, the closure member 41 can be closed by bringing the first member 42 into close contact with the second member 43.

  Further, since the optical cable simple closure 40 includes the placing portion 47, the optical fiber 19 with the first connector and the optical fiber 29 with the second connector can be connected to each other. Therefore, the optical fiber connection can be easily dissociated. Thereby, even if it is a case where it connects with a different optical fiber core wire accidentally, the connection can be cancelled | released and it can connect with the correct optical fiber core wire. Further, when a problem occurs in optical communication or the like, it is possible to check the communication abnormality in each optical fiber core wire by releasing the connection. In particular, since it is possible to easily determine the defective portion without entering the user's home, the abnormal portion can be quickly identified. In addition, when changing a telecommunications carrier according to a user's request or the like, the telecommunications carrier can be changed without changing the optical fiber in the user's home, and the telecommunications carrier can be easily changed.

  In addition, since the first and second connectors 31 and 32 are each connected to the adapter 33, they can be connected via the adapter 33 even if they have different shapes, and are accommodated without rattling in the closure housing 41. Is done.

  Further, a connection destination display means A and a transparent portion 46 are formed on the outer surface of the closure housing 41. Therefore, as shown in FIG. 2, the optical fiber connection destination and the types and shapes of the connectors 31 and 32 are visually recognized even after being suspended from the first and second support wire portions 12 and 22. It is possible to visually recognize the connection destination of the optical fiber and the types and shapes of the connectors 31 and 32 without raising the utility pole and opening the closure housing 41. Therefore, the work efficiency can be improved.

  Moreover, the closure housing | casing 41 is formed through the hinge part 44 so that opening and closing is possible. Therefore, the open state of the closure housing 41 can be maintained without using a support member or the like, and the working time can be shortened.

  In addition, elastic bodies 45, 45 are press-fitted into the end faces 41 a, 41 b of the closure housing 41. Therefore, it is possible to prevent moisture and dust in the air from entering the closure housing 41.

<< Embodiment 2 of the Invention >>
In the second embodiment, the configuration of the optical cable simple closure 70 will be described with reference to FIG. FIG. 6 is a perspective view showing the inside of the simple closure 70 for an optical cable. Note that in the optical cable simple closure 70 of the present embodiment, the first groove 81 is formed in the first surplus length processing portion 78 and the second groove is not formed in the second surplus length processing portion 79, instead of being attached with a pin. 82 is formed.

  As shown in FIG. 6, the first groove 81 is formed to meander in the first extra length processing section 78, and the second groove 82 is formed to meander in the second extra length processing section 89. As a result, the optical cable simple closure 70 is formed so that it can be accommodated by applying extra length processing to the optical fibers 19 and 29 with the first and second connectors, similarly to the optical cable simple closure 40 of the first embodiment. ing.

<< Other Embodiments >>
The present invention may be configured as follows with respect to the first embodiment.

  Although the closure casing 41 is cylindrical, it is not limited to the outer shape as long as it is cylindrical.

  The connection destination display means A is assumed to have a different color on the outer surface of the closure housing 41, but is not limited to this method. For example, characters representing the first transmission source and the second transmission source may be written on the outer surface of the optical cable simple closure 40. After the optical cable simple closure 40 is suspended from the electric wire, the optical cable simple closure 40 is suspended from the ground. If the sender is known when the user visually recognizes, it is preferable because the sender can be known without opening the optical cable simple closure 40.

  Although the three pins 51 to 53 and 54 to 56 are attached to the first and second extra length processing sections 48 and 49, respectively, the first member 42 is not limited to the pins. Any protrusion that extends from the inner surface of the substrate may be used. Needless to say, the arrangement, shape, and number of pins 51, 52,..., 55, 56 are not limited. Moreover, the pin (dummy pin) which does not perform the extra length process of the optical fibers 19 and 29 with the 1st and 2nd connectors may be provided.

  Although the adapter 33 is placed on the placement portion 47 of the first member 42, the adapter 33 may be bonded and fixed to the first member 42 in advance. That is, the optical cable simple closure 40 may be a closure with an adapter.

  When the first and second optical drop cables 10 and 20 are accommodated in the optical cable simple closure 40, the optical cable simple closure 40 is temporarily fixed to the first and second support wire portions 12 and 22, and then the first connected to the connector. Although the optical fibers 19 and 29 with the second connector are accommodated in the closure housing 41, the reverse procedure may be used. That is, the optical fiber simple closure 40 may be attached to the first and second support wire portions 12 and 22 after the optical fibers 19 and 29 with the first and second connectors connected to each other are accommodated in the closure housing 41.

  The present invention may be configured as follows for the second embodiment.

  Each of the first and second grooves 81 and 82 is not limited to the shape shown in FIG. 6 and may be a groove formed with at least a curved portion.

  As described above, the present invention is useful for a simple closure for an optical cable, and particularly useful for a closure in which a part of an optical fiber with a connector connected by an adapter is accommodated.

It is a cross section of an optical drop cable. It is a perspective view which shows a mode that the simple closure for optical cables was attached to the support line part. FIG. 2 is a perspective view showing the inside of a simple optical cable closure 40 according to the first embodiment. It is a perspective view which shows a mode that the optical fibers 19 and 29 with a 1st and 2nd connector were accommodated in the inside of the simple closure 40 for optical cables in Embodiment 1. FIG. It is a figure which shows 1 process of the method of attaching the simple closure for optical cables to a support line part. It is a figure which shows 1 process of the method of attaching the simple closure for optical cables to a support line part. It is a figure which shows 1 process of the method of attaching the simple closure for optical cables to a support line part. It is a perspective view which shows the inside of the simple closure 70 for optical cables in Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 19 Optical fiber with 1st connector 29 Optical fiber with 2nd connector 31 1st connector 32 2nd connector 33 Adapter 40, 70 Optical cable simple closure 41, 71 Closure housing | casing 41a Front side end surface 41b Rear side end surface 46 Transparent part 47 Placement section 48, 78 First extra length processing section 49, 79 Second extra length processing section 51, 52, ..., 55, 56 Pin (projection)
A connection destination display means

Claims (6)

A simple closure for an optical cable that accommodates a connection portion between an optical fiber with a first connector and an optical fiber with a second connector,
A closure housing having a first end face that is cylindrical and sealed so that the optical fiber with the first connector can be inserted; and a second end face that is sealed so that the optical fiber with the second connector can be inserted;
A placement portion provided on an inner surface of the closure housing for placing an adapter for connecting the first connector and the second connector to connect the optical fiber with the first connector and the optical fiber with the second connector; A simple closure for optical cables. In the simple closure for optical cables according to claim 1,
Furthermore, provided in a region sandwiched between the placing portion and the first end surface, comprising a surplus length processing portion for processing a fiber surplus length of the optical fiber with the first connector,
In the surplus length processing portion, a plurality of protrusions each extend from the inner surface of the closure housing,
A simple closure for an optical cable, wherein the optical fiber with the first connector is hung on at least one of the protrusions and subjected to extra length processing. In the simple closure for optical cables according to claim 2,
A part of the plurality of protrusions is a straight line extending in a longitudinal direction of the closure housing from a portion where the optical fiber with the first connector is inserted into the first end surface. A simple closure for an optical cable, which is disposed on a side opposite to the remaining projections of the optical cable. In the simple closure for optical cables according to claim 3,
The simple closure for an optical cable, wherein the adjacent protrusions are arranged on opposite sides with respect to the straight line. In the simple closure for optical cables according to any one of claims 1 to 4,
The closure housing has a first connection destination for exchanging signals propagated in the optical fiber with the first connector and a second connection destination for exchanging signals propagated in the optical fiber with the second connector on the outer surface. A simple closure for an optical cable, comprising a connection destination display means for displaying. In the simple closure for optical cables as described in any one of Claims 1 thru | or 5,
The simple closure for an optical cable, wherein the closure housing has a transparent portion that allows at least the adapter to be visually recognized.

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