JPH0434482Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is an optical fiber tape that receives and senses leakage light emitted from an optical fiber core wire, and is used for maintenance etc. after the construction of an optical fiber line. This invention relates to a core wire reference device.

"Prior Art" Conventionally, as a control device used for the above-mentioned purpose, one having the configuration shown in FIG. 5 is known. (1985 National Institute of Electronics and Communication Engineers General Conference,
(Low insertion loss sensor for optical fiber calibrator announced in 2276) In FIG. The fiber optic device 1 includes a main body 3, a plurality of supporting members 4 for supporting and bending the inserted single fiber wire 2, and a light receiver for receiving and sensing leaked light emitted from the single fiber wire 2. 5 is arranged. This light receiver 5 uses a photodiode or the like that generates electricity by receiving light, and sends an electric signal generated by receiving the leaked light to the leaked light identification device 6 to detect the presence or absence of leaked light. It is now possible to do so. In the main body 3,
A mirror surface is formed on the side facing the arrangement position of the light receiver 5, so that the light receiver 5 can efficiently receive the leaked light emitted from the single fiber wire 2.

The fiber identification device 1 configured as described above identifies the optical signal transmission of the single fiber wire 2 in the following manner. When an optical signal is transmitted to the single-fiber wire 2 in the direction indicated by the arrow in Figure 4, leaked light is emitted backward from the bent portion of the single-fiber wire 2 (toward the right in the figure). .
This leaked light enters the optical receiver 5 and is identified as being transmitted as an optical signal. When transmission of the optical signal through the single-fiber wire 2 is stopped, no leakage light enters the light receiver 5 from the single-fiber wire 2, and it is determined that no optical signal is being transmitted through the single-fiber wire 2.

``Problems to be solved by the invention'' However, when the above-mentioned fiber comparison device is applied to a ribbon fiber bundled with a large number of optical fibers, it is necessary to Although it is possible to identify whether or not an optical signal is being transmitted through a wire, there is a drawback that it is not possible to identify which single fiber of the tape core wire is transmitting an optical signal.

This invention was made in view of the above circumstances, and the purpose is to provide a fiber comparison device that can detect the presence or absence of optical signal transmission in each single fiber of a tape fiber. It is.

``Means for Solving the Problems'' The fiber comparison device of this invention includes a light receiver that receives and detects leakage light from the optical fiber tape core, and a link between the light receiving part of the light receiver and the optical fiber tape core. and an optical switch for switching between blocking and transmitting leaked light to the optical receiver, and the optical switch switches between blocking and transmitting leaked light to the optical receiver, and the optical switch switches between blocking and transmitting leaked light to the optical receiver, and the optical switch switches between blocking and transmitting leaked light to the optical receiver. It is characterized by performing a switching operation between blocking light and transmitting light.

"Embodiment" FIGS. 1 to 3 are diagrams showing an embodiment of this invention. In these figures, the reference numeral 7 is a fiber matching device, and the reference numeral 8 is a tape fiber. This tape core wire 8 is made by bundling a large number of single fiber optic fibers 2, 2, . . . into a tape shape. The above-mentioned core wire comparison device 7
is constructed by disposing a liquid crystal plate 9 in the light receiving portion of a light receiver 5, and is adapted to be attached so that the tape core wire 8 and the liquid crystal plate 9 are in contact with each other. The relationship between the width dimension A of the tape core wire 8 and the width dimension B of the light receiver 5 and the liquid crystal plate 9 is as follows: A≦B.

The light receiver 5 uses a photodiode or the like that generates an electrical signal by receiving light. The liquid crystal plate 9 has the same number of rectangular liquid crystal units 10, 10, 10, 10, . It is formed. The liquid crystal units 10, 10... of this liquid crystal plate 9 have terminals 11, 11 at both ends thereof.
By changing the voltage of..., each unit can be switched between a light-blocking state and a light-transmitting state. These liquid crystal units 10, 10...
The terminals 11, 11, . . . and the electrical signal output terminal 12 of the light receiver 5 are connected to an optical signal identification device 13. The optical signal identification device 13 includes a liquid crystal control circuit that controls each liquid crystal unit 10, 10, .
A leakage light identification device that identifies the presence or absence of leakage light emitted from the tape core wire 8, and liquid crystal units 10, 10.
. . and a processor that compares the switching state of the light receiver 5 with the electric signal from the light receiver 5 and calculates the light receiving position of the leaked light.

The tape fiber matching operation of the above-mentioned fiber matching device 7 is performed as follows. As shown in FIG. 3, one liquid crystal unit 10 among the plurality of liquid crystal units 10, 10, . The liquid crystal control circuit is operated so as to perform a pattern of sequentially moving →→→... in a time of . Single core wire 2 of tape core wire 8,
2... When an optical signal is transmitted to any of the single-core wires 2, the leaked light emitted from that single-core wire 2 is transmitted to the receiver 5, but when it comes into contact with this single-core wire 2, When the liquid crystal unit 10 in this state enters the light-shielding state, the leaked light is shielded and the signal from the light receiver 5 is interrupted. The optical signal identification device 13 determines the timing of signal interruption of the light receiver 5 and the liquid crystal units 10, 10, . . .
By comparing the movement pattern of the light shielding state with the movement pattern of the light shielding state, it is possible to instantly identify which single fiber wire 2 of the single fiber wires 2, 2, . . . of the tape core wire 8 is transmitting the optical signal. In addition, liquid crystal unit 1
The switching pattern between light shielding and light transmission of 0, 10... is as follows:
Contrary to the above movement pattern, one liquid crystal unit 10 is placed in a light-transmitting state, the other liquid crystal units 10, 10, etc. are placed in a light-blocking state, and the liquid crystal units 10 in the light-transmitting state are sequentially moved in the order of →→→... It may also be operated to perform a pattern that causes In this movement pattern, when the liquid crystal unit 10 in contact with the single fiber wire 2 transmitting the optical signal becomes transparent, the leaked light from the single fiber wire 2 is transmitted to the light receiver 5, and the electrical signal is transmitted. By generating this, it is possible to identify which single fiber wire 2 the optical signal is being transmitted to.

The above-mentioned fiber optic comparison device 7 is provided between the light-receiving portion of the light receiver 5 and the tape fiber 8, for blocking and transmitting leakage light for each single fiber 2, 2, . . . of the tape fiber 8. Since the configuration is provided with a liquid crystal plate 9 that performs a switching operation with light, among the single fibers 2, 2... of the tape core wire 8,
It is possible to reliably identify which single-core wire 2 the optical signal is being transmitted to.

FIG. 4 is a diagram showing another embodiment of this invention. The fiber comparison device 7 of the above-mentioned embodiment has a structure in which the tape fiber 8 and the liquid crystal plate 9 are placed in contact with each other to receive leaked light emitted from the tape fiber 8. , the core fiber comparison device 14 of this embodiment
is a support member 4 for bending the tape core wire 8.
A light receiver 5 is disposed within a control device main body 15 formed with..., and a liquid crystal plate 9 is provided between the light receiving portion of the light receiver 5 and the tape core wire 8. When the tape core wire 8 is inserted into the target device main body 15, a part thereof is supported by the plurality of support members 4...
It's starting to get twisted. Control device main body 15
A mirror surface is formed on the side facing the light-receiving section, so that the leakage light emitted from the tape core wire 8 is efficiently received by the light receiver 5.

The above-described fiber comparison device 14 has the same effects as the above-described embodiment, such as being able to identify which single fiber is transmitting an optical signal among the single fibers 2, 2, . . . of the tape fiber 8. In addition, since the tape core wire 8 is bent, the amount of leakage light emitted from the tape core wire 8 can be increased, and the leakage light can be easily received.

In each of the above-mentioned embodiments, the liquid crystal plate 9 is used to switch between blocking and transmitting leaked light, but any device that can switch between blocking and transmitting leaked light may be used. The configuration is not limited to this, and a configuration using a shutter or the like may be used.

Furthermore, in each of the above-described embodiments, a photodiode is used as the light receiver 5 for receiving and sensing leaked light, which generates an electrical signal by receiving light, and receives this electrical signal to identify the presence or absence of leaked light. However, the present invention is not limited thereto, and other light receiving and sensing means such as a waveguide may be used.

``Effects of the invention'' The fiber comparison device of this invention is installed between the light-receiving part of the photoreceiver and the tape fiber, and detects the leakage of light and the transmission of light for each single fiber of the tape fiber. Since an optical switch for performing a switching operation is provided, it is possible to identify which single fiber of the tape fibers the optical signal is being transmitted to.

[Brief explanation of the drawing]

1 to 3 are views showing one embodiment of this invention, in which FIG. 1 is a schematic perspective view of a core fiber comparison device, FIG. 2 is a schematic side sectional view of the same, and FIG. 3 is a liquid crystal panel. 4 is a schematic plan view of another embodiment of the present invention, and FIG. 4 is a schematic side sectional view of a fiber locating device, and FIG. 5 is a schematic side sectional view showing a conventional fiber locating device. be. 1, 7, 14... Core wire comparison device, 2... Single fiber wire, 5... Light receiver, 8... Tape core wire, 9... Liquid crystal plate (light switch).

Claims (1)

[Scope of utility model registration request] A light receiver for receiving and sensing leakage light from the optical fiber tape core, and a light receiver disposed between the light receiving portion of the light receiver and the optical fiber tape core, and a light receiver for blocking leakage light to the light receiver and for transmitting light. an optical switch that performs a switching operation, and the optical switch performs a switching operation between blocking leakage light and transmitting light for each single fiber of the optical fiber ribbon. Contrast device for tape cores.