JPH06250039A - Detection and detector for reverse connection of optical fiber cable - Google Patents

Abstract

(57) [Abstract] [Purpose] To detect the reverse connection of each optical fiber of an optical fiber cable. [Configuration] Each optical fiber 12 of the optical fiber cable 11
The end portions of are held by the connector ferrules 13, respectively.
The light from each optical fiber 12 of the connector ferrule 13 is detected by the photodetector 14. The light of each optical fiber 12 passing between the connector ferrule 13 and the photodetector 14 is blocked by the light blocking mechanism 15 one by one. [Effect] By confirming the light shielding direction of each optical fiber by the light shielding mechanism, the directionality of the light of each optical fiber can be detected, so that the reverse connection of each optical fiber of the optical fiber cable can be detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for detecting a reverse connection of an optical fiber cable capable of detecting light passing through each optical fiber of the optical fiber cable and detecting reverse connection of the optical fibers connected to each other. It is about.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, in an optical subscriber network for connecting a user side equipment and a center side equipment with an optical fiber to perform high-speed broadband transmission, as shown in FIG. The optical fiber cable 3 is connected to the cable laying path 2 such as a ditch or a cave that is connected to the equipment 1.
Has been laid. When connecting the optical fiber cable 3 to the user-side equipment facility 4, the user-side equipment facility 4 is connected to the cable laying path 2 and the optical fiber cable 3 in the cable laying path 2 is connected to the user-side equipment facility 4.
The optical fiber cable 3a is connected, and the optical fiber connection box 5 is connected to the optical fiber cable 3a.

In this optical fiber connection box 5, a plurality of optical fibers of the optical fiber cable 3a and a plurality of optical fibers of the user side equipment 4 which are respectively connected to the plurality of optical fibers are connected. When connecting these optical fibers, an optical loss test from the center side equipment 1 to the optical fiber connection box 5 may be performed. In this optical loss test, in order to detect the connection order of the optical fibers of the optical fiber cables 3 and 3a connected to each other, the work of detecting the light passing through each optical fiber of the optical fiber cable 3a is performed.

In the optical loss test of such an optical fiber cable, test light is sent from the center side equipment 1 and this test light is detected by the optical fiber connection box 5. In this optical fiber connection box 5, an optical fiber cable is attached to a multi-core connector ferrule. The operation of detecting the test light of the optical fiber cable is sometimes connected to the single-core detection device or connected to the multi-core detection device.

In the single-core detecting device, one end of a single-core separation cord is connected to an optical fiber cable, an SC-type optical connector or the like is connected to the other end of the single-core separation cord, and an optical fiber is connected to the SC-type optical connector or the like. The detector is connected.
Therefore, the test light of the optical fiber cable is detected by the photodetector via the single-fiber separation cord, the SC type optical connector, and the like. The multi-core detection device has a structure in which a photodetector is integrally connected to a connector ferrule.

[0006]

However, since the single-core detecting device is connected to the optical fiber cable via the single-fiber separating cord, it is not possible to directly detect the test light passing through the optical fiber cable. Further, the single-core detection device can detect a part of the test light of the optical fiber cable, but cannot separate the test light for each optical fiber of the optical fiber cable. On the other hand, the multi-core detector is
Although all the test light of the optical fiber cable can be detected, the test light cannot be separated for each optical fiber of the optical fiber cable. In addition, since the photodetector is integrally attached to the connector ferrule in the multi-core detection device, it is possible to determine whether the test light is sent from the center-side equipment or the user-side equipment. Therefore, the directionality of the test light could not be detected.

[0007] The present invention effectively solves the above-mentioned problems. The light of each optical fiber of an optical fiber cable can be directly detected, and the directionality of light passing through each optical fiber can be detected, so that the light to be connected to each other can be detected. An object of the present invention is to provide a method and a device for detecting reverse connection of an optical fiber cable, which can detect reverse connection of each optical fiber of the fiber cable.

[0008]

A method for detecting reverse connection of an optical fiber cable according to claim 1 is a method for detecting reverse connection of an optical fiber cable for detecting light passing through each optical fiber of the optical fiber cable. , At least one of the light passing through each optical fiber of the optical fiber cable is blocked by a light shielding mechanism, and each optical fiber of the optical fiber cable is connected in reverse depending on whether or not the light of the optical fiber is detected by a photodetector. It is characterized by detecting whether or not it has been performed.

According to a second aspect of the present invention, there is provided an optical fiber cable reverse connection detecting device which detects the light passing through each optical fiber of the optical fiber cable, and which is the reverse connection detecting device of the optical fiber cable. Connector ferrules that respectively hold the end portions of the optical fibers, photodetectors that detect the light from the optical fibers held by the connector ferrules, and are disposed between the connector ferrule and the photodetector. It is characterized in that it is configured to have a light blocking mechanism for blocking at least one light of the optical fiber.

An optical fiber cable reverse connection detection device according to a third aspect of the present invention is the optical fiber cable reverse connection detection device according to the second aspect, wherein the light-shielding mechanism includes a connector ferrule and a photodetector. It is characterized in that it has a shutter movably arranged between them.

An optical fiber cable reverse connection detection device according to a fourth aspect of the present invention is the optical fiber cable reverse connection detection device according to the second aspect, wherein the light-shielding mechanism includes a connector ferrule and a photodetector. A light-shielding plate rotatably disposed between the light-shielding plates, and the light-shielding plate is formed with through-holes for passing the light of each optical fiber to the photodetector one by one. is there.

[0012]

In the method for detecting the reverse connection of the optical fiber cable according to the present invention, at least one of the light passing through each optical fiber of the optical fiber cable is blocked by the light shielding mechanism, and the light of the optical fiber is detected by the photodetector. Since it is detected whether or not each optical fiber of the optical fiber cable is reversely connected depending on whether or not the optical fiber cable is connected, it is possible to detect whether or not the connection order of the optical fibers of the optical fiber cables connected to each other is reverse. That is, it is possible to detect the reverse connection of the optical fibers of the optical fiber cables connected to each other.

According to a second aspect of the present invention, there is provided an optical fiber cable reverse connection detecting device in which an end portion of each optical fiber of the optical fiber cable is held by a connector ferrule, and light from each optical fiber held by the connector ferrule is held. Is detected by the photodetector. Therefore, since the photodetector directly detects the light of each optical fiber of the optical fiber cable, the directionality of the light can be detected. Then, since the light blocking mechanism arranged between the connector ferrule and the photodetector blocks at least one light from each optical fiber, the light blocking mechanism blocks the light passing through each optical fiber. It is not detected by the photodetector, and it is determined whether the connection order of the optical fibers in the middle of the optical fiber cable is reverse.

According to a third aspect of the present invention, there is provided a detecting device for reverse connection of an optical fiber cable, which has the action of the second aspect, and the light shielding mechanism includes a shutter movably arranged between the connector ferrule and the photodetector. Therefore, by moving this shutter, the light passing through each optical fiber is blocked. Then, by adjusting the moving distance of the shutter, the shutter is moved to the end of each optical fiber, and the light is blocked for each optical fiber.

According to a fourth aspect of the present invention, there is provided a detecting device for reverse connection of an optical fiber cable, which has the action of the second aspect, and in which the light shielding mechanism is rotatably arranged between the connector ferrule and the photodetector. Since it has a plate, the light of each optical fiber is blocked by this light blocking plate. Since the through-holes for passing the light of each optical fiber to the photodetector one by one are respectively formed in the light shielding plate, the light passes through the penetrating light, and the light is detected by the photodetector. The connection order of each optical fiber in the middle of the optical fiber cable is detected.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for detecting the reverse connection of an optical fiber cable and the detecting apparatus of the present invention will be described below with reference to FIG. As shown in FIG. 1, reference numeral 10 is a detection device for reverse connection of an optical fiber cable, and the detection device 10 for reverse connection of an optical fiber cable holds an end portion of each optical fiber 12 of an optical fiber cable 11, respectively. Connector ferrule 13, a photodetector 14 that detects the light from each optical fiber 12, and a light shielding mechanism 15 that shields the light from each optical fiber 12 respectively.

The optical fiber cable 11 is composed of, for example, eight optical fibers 12 and a coating portion (not shown) for bundling and coating the optical fibers 12. The connector ferrule 13 is formed, for example, in a box shape, and has a configuration in which a plurality of holding holes for respectively holding the end portions of the respective optical fibers 12 exposed from the coating portion of the optical fiber cable 11 are formed. There is.

The photodetector 14 is a connector ferrule 13.
Is arranged so as to face the end of each optical fiber 12 held by
Light receiving section 16 for receiving light passing through these optical fibers 12
And a conversion unit (not shown) that converts the light incident on the light receiving unit 16 into electrical energy. The light blocking mechanism 15 is disposed between the connector ferrule 13 and the photodetector 14, and a shutter 17 that blocks the light sent from the end of each optical fiber 12 to the light receiving unit 16 of the photodetector 14. This shutter 17 is moved between each optical fiber 12 and the photodetector 14, and each optical fiber 12
And a drive control unit (not shown) that stops the shutter 17 at the position.

In the detection device 10 for the reverse connection of such an optical fiber cable, the test light is made to enter the optical fibers 12 of the first and eighth cores of the optical fiber cable 11 from the equipment on the center side, and the test light is the optical fiber. The test light passes through the optical fibers 12 of the cable 11 and reaches the photodetector 14 from the ends of the optical fibers 12. This photo detector 1
In 4, the test light is made incident on the light receiving section 16, and the light receiving section 1
A light loss test is performed by converting the light incident on 6 into electric energy in the conversion unit and measuring the light energy of the test light.

Next, the shutter 17 of the light shielding mechanism 15 is moved from the position of the end of the first or eighth optical fiber 12 to the position of the fourth or fifth optical fiber 12,
The optical fiber 12 is closed from the first to fourth cores, or the fifth to eighth cores, and the optical fiber 12 from the first or eighth cores to the light receiving section 1 is closed.
The test light passing through 6 is blocked by the shutter 17. Here, by measuring the light energy of the test light, the shutter 1
At 7, the measurement result before closing the connector ferrule 13 and the measurement result after closing the connector ferrule 13 are compared, and the difference in light energy due to these measurement results is confirmed.

Here, if the difference in light energy is equal to or larger than a predetermined value, it can be determined that the test light is transmitted from the optical fiber 12 on the first or eighth core side where the light is shielded.
In this way, depending on whether or not the core number of the optical fiber 12 that has sent the test light from the center-side equipment and the core line of the first or eighth optical fiber 12 shielded by the shutter 17 match. It is possible to detect whether or not the connection order of the cores of the optical fiber cables 11 connected to each other by a cable laying path or the like is reversed.

According to the reverse connection detection device 10 of such an optical fiber cable, the connector ferrule 13 holds each end of each optical fiber 12 of the optical fiber cable 11 and detects the light of each optical fiber 12. It is detected by the device 14. In the photodetector 14, the light of each optical fiber 12 is incident on the light receiving unit 16, the light incident on the light receiving unit 16 is converted into electric energy by the conversion unit, and the electric energy is measured. The light energy of each optical fiber 12 is detected. Therefore, all the light of each optical fiber 12 can be detected by the photodetector 14, and the light of each optical fiber 12 can be directly detected by the photodetector 14, so that the optical loss due to the connection of the optical fiber cable 11 is measured. be able to.

Since the shutter 17 moves the space between the connector ferrule 13 and the photodetector 14 to block the light of each optical fiber 12 one by one, the light-shielding mechanism 14 is designed to shield the connector ferrule 13 from the light. The optical path of the optical fiber 12 to and from the detector 14 is blocked by the shutter 17, and the light of each optical fiber 12 is prevented from being detected by the photodetector 14. Therefore, since the light can be shielded for each optical fiber 12, it is possible to confirm the coincidence between the core of the optical fiber 12 that transmits the light from the center-side equipment and the shield of the optical fiber 12. Therefore, the optical fiber cables 11 connected to each other by a cable laying path or the like.
It is possible to detect whether or not the connection order of the core wires is reversed. Then, by checking the light blocking direction of the optical fiber 12, it is possible to determine whether the light is sent from the center side equipment or the user side equipment.

<Other Embodiments> Another embodiment of the reverse connection detection device for an optical fiber cable according to the present invention will be described with reference to FIGS. As shown in FIGS. 2 to 3, in the other embodiments, the light shielding mechanism is different from that of the above embodiment, and the other structures are the same. Here, the same components as those in the above-mentioned embodiment are designated by the same reference numerals to simplify the description. As shown in FIG. 2, the light blocking mechanism 20 has a light blocking plate 21 disposed between the connector ferrule 13 and the photodetector 14. This shading plate 21
Is the support base 2 to which the connector ferrule 13 is attached.
It is rotatably supported by 2.

As shown in FIG. 3, a plurality of (eight in the figure) through holes 22 are formed in the light shielding plate 21. These through holes 22 are formed larger than the connector ferrule 13 and a plurality of first through holes 22a to 22h formed at positions corresponding to the positions of the respective optical fibers 12 of the connector ferrule 13 from the rotation center axis of the light shielding plate 21. , Each optical fiber 1
It is composed of a rectangular second through hole 22i that allows all the two lights to pass therethrough.

The first through holes 22a to 22h are provided in the light shielding plate 21.
The optical fibers 1 are arranged spirally around the rotation center axis of the optical fiber 1 from the rotation center axis of the light shielding plate 21.
It is formed every two positions. That is, one of the lights of each optical fiber 12 is connected to each of the first through holes 22a to 22a.
When passing through h, all the light from the other optical fibers 12 is blocked by the light blocking plate 21.

Thus, the first through hole 22a of the light shield plate 21 is formed.
By passing the light of each optical fiber 12 to 22h, the optical fiber cable 11 from the center side equipment is transmitted.
The test light transmitted to the photodetector 14 can be incident on the light receiving portion 16 of the photodetector 14 for each optical fiber 12. For this reason, since the optical energy of the test light can be measured for each optical fiber 12 of the optical fiber cable 11, the optical energy of the test light can be directly measured, and the optical energy of the optical fiber 12 of the connector ferrule 13 can be measured by the test light. You can check if it is sent from the line. Therefore, the optical fiber cable 1 connected to each other by a cable laying path or the like
It is possible to detect whether or not the connection order of one core wire is reversed.

Then, by moving the second through hole 22i of the light shielding plate 21 to the position of the connector ferrule 13, all the light passing through each optical fiber 12 reaches the light receiving portion 16 of the photodetector 14, and all the light is transmitted. Energy can be measured. Therefore, the measurement result when light of each optical fiber 12 is passed through each first through hole 22a to 22h and the measurement result when all light of each optical fiber 12 is passed through second through hole 22i are compared. However, a difference in light energy is confirmed by these measurement results. Here, if the difference in light energy is equal to or more than a predetermined value, it can be determined that the test light is transmitted from another optical fiber 12 that has been shielded.

Although the optical fiber cable 11 has the eight-core optical fiber 12 in the above embodiment,
The present application is not limited to this, and can be applied to the case where the optical fiber cable 11 has two or more optical fibers 12.

[0030]

As described above, according to the method and the device for detecting the reverse connection of the optical fiber cable of the present invention, the following effects can be obtained. According to the method for detecting the reverse connection of the optical fiber cable according to claim 1, at least one of the lights passing through each optical fiber of the optical fiber cable is blocked by the light shielding mechanism, and the light of the optical fiber is detected by the photodetector. Since it is configured to detect whether or not each optical fiber of the optical fiber cable is connected in reverse depending on whether or not
The connection order of the optical fibers of the optical fiber cables connected to each other in the cable laying path or the like can be confirmed depending on whether or not the light of the optical fibers is blocked. Then, by confirming the light shielding direction of each optical fiber, the directivity of light passing through each optical fiber can be detected. Also, by attaching a multi-core detecting device or the like to the optical fiber cable, each optical fiber of the optical fiber cable can be directly detected. For this reason,
The connection order of the optical fibers of the optical fiber cables connected to each other can be detected, and the reliability of the connection work of the optical fiber cables can be improved.

According to another aspect of the present invention, there is provided a connector ferrule for holding an end portion of each optical fiber of an optical fiber cable.
Since the connector ferrule is configured to have a photodetector for detecting light from each optical fiber, the connector ferrule holds each end of each optical fiber of the optical fiber cable, and Light is detected by the photodetector. Therefore, all the light from each optical fiber can be detected by the photodetector, and the light from each optical fiber can be directly detected by the photodetector, so that the optical loss measuring function can be maintained.

Since the light-shielding mechanism is provided between the connector ferrule and the photodetector and shields at least one light from each optical fiber, at least one light from each optical fiber is blocked by the light-shielding mechanism. By blocking light
Detection of this at least one light with a photodetector is blocked. Therefore, by shielding the light for each optical fiber, it is possible to separate the light for each optical fiber, and the optical fiber of the center side equipment and the optical fiber of the shielded optical fiber You can check the match. Therefore,
It is possible to detect whether the order of connecting the optical fibers of the optical fiber cables connected to each other through a cable laying path or the like is reversed, and it is possible to improve the reliability of the connection work of the optical fiber cables. Then, by checking the light blocking direction of the optical fiber, it is possible to determine whether the light is sent from the center side equipment or the user side equipment. Therefore, the reliability of the optical fiber connection work can be improved.

According to the optical fiber cable reverse connection detection device of the third aspect, the effect of the second aspect can be obtained, and the light shielding mechanism is movable between the connector ferrule and the photodetector. Since the shutter is arranged at, the optical path of the optical fiber between the connector ferrule and the photodetector is blocked by moving this shutter. Therefore, the light of each optical fiber can be individually detected, and the directionality of the light can be detected by confirming the directionality of the shielded light, which can improve the reliability of the optical fiber cable connection work. it can.

According to the optical fiber cable reverse connection detecting device of the fourth aspect, the effect of the second aspect can be obtained, and the light shielding mechanism is rotated between the connector ferrule and the photodetector. Since the light shielding plate is freely arranged, and the light shielding plate is formed with through holes for passing light of each optical fiber to the photodetector one by one, Since one light passes and the optical paths of the other optical fibers are blocked by the light blocking plate, the light can be detected for each optical fiber. Therefore, the directionality of the light blocked by the light shielding plate can be confirmed, so that the directionality of the light can be detected, so that the reliability of the connection work of the optical fiber cable can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a reverse connection detection device for an optical fiber cable according to the present invention.

FIG. 2 is a side view showing another embodiment of FIG.

FIG. 3 is a front view showing the light shielding plate of FIG.

FIG. 4 is a side view showing a connection concept of a conventional optical fiber cable.

[Explanation of symbols]

 10 Optical Fiber Cable Reverse Connection Detection Device 11 Optical Fiber Cable 12 Optical Fiber 13 Connector Ferrule 14 Photodetector 15 Light-shielding Mechanism 17 Shutter 21 Light-shielding Plate 22 Through Hole

Claims (4)

[Claims] 1. A method for detecting reverse connection of an optical fiber cable for detecting light passing through each optical fiber of the optical fiber cable, wherein at least one of the light passing through each optical fiber of the optical fiber cable is blocked by a light blocking mechanism. , The reverse connection of the optical fiber cable is characterized by detecting whether or not each optical fiber of the optical fiber cable is reversely connected depending on whether or not the light of the optical fiber is detected by the photodetector. Detection method. 2. An optical fiber cable reverse connection detection device for detecting light passing through each optical fiber of the optical fiber cable, and a connector ferrule for holding each end of each optical fiber of the optical fiber cable, A photodetector for detecting light from each optical fiber held by the connector ferrule, and a light-shielding mechanism that is disposed between the connector ferrule and the photodetector and shields at least one light of each optical fiber. A detecting device for reverse connection of an optical fiber cable, which is configured to have. 3. The optical fiber cable reverse connection detection device according to claim 2, wherein the light shielding mechanism has a shutter movably arranged between the connector ferrule and the photodetector. A detection device for reverse connection of optical fiber cable. 4. The optical fiber cable reverse connection detection device according to claim 2, wherein the light shielding mechanism has a light shielding plate rotatably arranged between the connector ferrule and the photodetector. A device for reverse connection of an optical fiber cable, characterized in that each of the light shielding plates is formed with a through hole for passing light of each optical fiber to the photodetector one by one.