KR100279708B1 - Ribbon optical fiber loss measuring device - Google Patents

Abstract

The present invention relates to a ribbon optical fiber loss measuring apparatus, and combines an optical fiber core wire selector that can select only an arbitrary optical fiber core wire among a plurality of optical fiber cores and a pseudo optical fiber used when measuring the connection loss of an optical fiber with an optical pulse tester, The present invention relates to a ribbon optical fiber loss measuring apparatus which reduces the connection loss measurement time of ribbon optical fibers by allowing the optical fiber core wires to be connected to the optical pulse tester at one time, thereby improving the efficiency of measuring and connecting operations.

Description

Ribbon optical fiber loss measuring device

The present invention relates to a ribbon optical fiber loss measuring device, and in particular, by combining the optical fiber core selector which can select only the arbitrary optical fiber core wires among the pseudo optical fiber and a plurality of optical fiber cores used in measuring the connection loss of the optical fiber with an optical pulse tester, The present invention relates to a ribbon optical fiber loss measuring apparatus which reduces the connection loss measurement time of ribbon optical fibers by allowing the ribbon optical fiber core wires to be connected to the optical pulse tester at one time, thereby improving the efficiency of the measuring and connecting operations.

1 is a view showing a method for measuring optical fiber connection loss by a conventional optical pulse tester.

As shown in FIG. 1, after the optical pulse tester 1 is installed at both ends of the optical fiber cable 5 based on the optical fiber cable connection point C, the optical pulse tester 1 and the optical fiber core line 5a to be measured 5a. ) To the pseudo optical fiber (3).

Next, at the optical fiber cable connection point (C), the core wire of the optical fiber is connected and at the same time, the unidirectional connection loss in the forward direction is measured by the optical pulse tester (1) installed on one side, and the optical pulse tester (1) installed on the other side is reversed. After measuring the unidirectional splice loss of sequentially, the actual splice loss is calculated from the average arithmetic value of each unidirectional splice loss measured in both directions.

On the other hand, Figure 2 is a view showing a connection method between the optical pulse tester and the ribbon optical fiber core to be measured in order to measure the connection loss of the ribbon optical fiber according to the prior art.

As shown in the figure, in the connection between the ribbon optical fiber cables 7, the optical fiber cores 7a and 7b to be measured are ribboned, and then the two ribbon optical fiber cores are connected at the ribbon optical fiber cable connection point D, and then the ribbon optical fiber In order to measure the splice loss, the optical fiber cores in the ribbon are separated into respective single-core optical fiber cores, and are sequentially connected to the optical pulse tester 1 and the pseudo optical fiber 3 from the upper optical fiber core 7a.

If more detailed description of the connection loss measurement method of the ribbon optical fiber to be carried out in the same manner as follows.

Where the ends of the ribbon optical fiber cable 7 are optically distributed or not accommodated in an optical distribution panel (not shown), the pseudo optical fiber cables 7 are connected at both ends of the cable 7 based on the ribbon optical fiber cable connection point D as shown in FIG. The optical connector 3a attached to one side of the optical fiber 3 is connected to the optical pulse tester 1, and the other side of the pseudo optical fiber 3 is treated with an optical fiber section such as coating removal and optical fiber cutting. Place it on the groove alignment plate (6).

Next, the ribbon optical fiber core 7a to be connected is separated into respective individual cores, and the upper fiber optic core 7c of the separated upper end is cross-sectioned, and then the pseudo optical fiber 3 and the optical fiber placed on the V groove alignment plate 6 are connected. Align the axis. When the ribbon optical fiber is connected at the ribbon optical fiber cable connection point D, the upper optical fiber core wire 7c is temporarily connected to the pseudo optical fiber 3 by the optical pulse tester 1 provided at both sides of the connection point D. The direction splice loss is measured sequentially in both directions, then the average arithmetic value is taken and the actual splice loss is evaluated.

Next, when the connection loss evaluation for the upper optical fiber core 7c is completed, only the upper optical fiber core 7c is separated from the V-groove alignment plate 6, and the optical fiber core wires of the cross-sectioned sequence are V-groove alignment plate 6 After making the temporary connection with the pseudo-optical fiber (3), measure the unidirectional connection loss of the optical fiber core in both directions with the optical pulse tester (1) installed on both sides of the connection point (D). The method of evaluating the losses is carried out in this manner up to the last nth fiber core (7b) in the ribbon.

On the other hand, the ribbon optical fiber cable connection point (D) waits until the actual connection loss evaluation of the last optical fiber in the ribbon is completed, and if any one of the optical fiber cores exceeds the reference value, the upper ribbon optical fiber core cable at the connection point (D) After cutting (7a), reconnection is carried out, and after reconnection, the actual connection loss of each optical fiber core in the ribbon is evaluated in the same manner as described above. When the connection loss of the optical fiber cores in the ribbon is less than the reference value, the ribbon optical fiber cores in the sequence are connected at the connection point D, and the actual connection loss is evaluated according to the above procedure.

However, in the above method, the splice loss of the optical fibers in the ribbon has to be measured separately compared to the simultaneous simultaneous splicing of the ribbon optical fibers in a short time. In (D), the delay of connection work delay does not increase the economic efficiency and efficiency of the installation cost due to the construction of the optical fiber network. In addition, since most of the fiber optic cable connection work is performed around highways, national roads, and downtown roads, it takes a long time to use the road due to the connection work, which greatly affects the communication of the vehicle and increases the incidence of safety accidents. There is this.

3 is a view showing a connection method between an optical pulse tester and a ribbon optical fiber core to which a multi-core separation cord is attached in order to measure the connection loss of the ribbon optical fiber according to the related art.

Unlike the method shown in FIG. 2, in the ribbon optical fiber cable 7 formed by the optical distribution box E or the multi-core separation cord in the optical distribution panel, the respective ribbon optical fiber cores 7a and 7b Are separated by a multi-core separation cord, and the optical connectors 7d of the separated single-core optical fiber cores are combined and fixed with the optical distribution box E or the adapter 4 in the optical distribution board, so that the connection loss of the ribbon optical fiber cores to be connected At the time of measurement, the optical connector 3a attached to one side of the pseudo optical fiber 3 is connected to the optical pulse tester 1, and the optical connector 3b connected to the other side is separated from the multi-core connected with the upper ribbon optical fiber core wire 7c. The adapter 4 is coupled to the optical connector 7d of the upper optical fiber core 7c of the cord.

Next, when the connection of the upper ribbon optical fiber core 7c is completed at the connection point D, a piece of the upper optical fiber core 7c connected to the pseudo optical fiber 3 by the optical pulse tester 1 provided on both sides of the connection point D. The direction splice loss is measured sequentially in both directions, then the average arithmetic value is taken and the actual splice loss is evaluated. When the actual connection loss evaluation for the upper optical fiber core 7c is completed, the optical connector 3b on the side of the pseudo-optical fiber 3 is separated from the optical connector 7d of the upper optical fiber core 7c, and the optical fiber core in order The adapter is connected to the optical connector 7d by using the adapter 4, and the optical pulse tester 1 installed at both ends of the cable to be connected is used to measure the unidirectional connection loss of the optical fiber core wires and evaluate the actual connection loss. The same shall be done to the last n fiber cores (7b) on the multicore separation cord to which the fiber cores are connected.

On the other hand, the connection point (D) waits until the actual connection loss evaluation of the last optical fiber in the ribbon is completed, and if any of the optical fiber cores is higher than the reference value, the upper ribbon optical fiber core is cut at the connection point (D). Then, reconnection is performed, and after reconnection, the actual connection loss of each optical fiber core in the ribbon is evaluated in the same manner as described above. In addition, when the connection loss of the optical fiber cores in the ribbon is less than the reference value, the ribbon optical fiber cores in the sequence are connected at the connection point (D), and the actual connection loss is evaluated according to the above procedure.

As described above, in order to measure the connection loss of the conventional ribbon optical fiber, the connection method of the ribbon optical fiber core to be measured and the optical pulse tester is to separate the optical fiber cores in the ribbon into single cores, and to separate the pseudo optical fibers and the V grooves into individual cores. Since the fiber optic axis should be aligned with the plate, the fiber optic cores separated into individual cores are arranged on the micro V-groove on the microscopic V-grooves, and the fiber optic cores for separating and separating the ribbon optical fiber cores. The workability is very low due to securing, and the connection time of the optical fiber cores in the ribbon is considerably short compared to the very short connection time due to simultaneous simultaneous connection of ribbon optical fibers at the optical fiber cable connection point. Due to delays in work, the installation of fiber-optic cables is prolonged. The.

Therefore, in order to solve the above problems, when connecting the ribbon optical fiber cable, in the connection method between the optical pulse tester and the ribbon optical fiber core for measuring the connection loss of the ribbon optical fiber, do not separate the optical fiber core in the ribbon It is an object of the present invention to provide a ribbon optical fiber loss measuring device that can be connected to the optical pulse tester at the same time, and to select the respective optical fiber core wires to quickly measure the connection loss of the optical fibers in the ribbon.

1 is a view showing a connection loss measurement method of the optical fiber according to the prior art

2 is a view showing a connection method between an optical pulse tester and a ribbon optical fiber core to be measured in order to measure the connection loss of the ribbon optical fiber according to the related art.

3 is a view showing a connection method between an optical pulse tester and a ribbon optical fiber core to which a multi-core separation cord is attached in order to measure the connection loss of the ribbon optical fiber according to the related art.

4 is a view showing the internal configuration of an optical fiber selection device for measuring the loss of ribbon optical fiber

5 is a view showing a schematic configuration of an apparatus for measuring ribbon fiber splice loss by using an optical fiber selection device for measuring splice loss of ribbon fiber in FIG. 4 according to the technique of the present invention;

※ Explanation of symbols used in main part of drawing

1: Optical pulse tester 2: Optical connector port

3: Optical fiber 3a, 3b, 5c, 7d, 10i, 14d: Optical connector

4,10j: Adapter 5: Fiber Optic Cable

5a, 7c: Upper fiber core 5b: n fiber core

6: V groove alignment plate 7: Ribbon optical fiber cable

7a: upper ribbon ribbon fiber core 7b: n ribbon ribbon fiber core

8: optical fiber core selector 8a: common terminal

8b: I / O terminal 9: I / O ribbon optical fiber core

9a, 14a, 15a: Ribbon optical connector 9b: Adapter for ribbon

10: input / output optical fiber core 10a: optical connector (FC / APC)

10b, 10d: Adapter (FC) 10c: Optical connector (FC / PC)

10e: Optical connector (SC / APC) 10f, 10h: Adapter (SC)

10g: Optical connector (SC / PC) 11: Pseudo optical fiber drawing drum

12: power supply unit 13: protective case

14: intermediary multi-core separation code 14b: multi-core separation unit

14c: optical fiber core 15: mediation ribbon optical fiber core

16 V groove alignment plate for ribbon optical fiber 17 Ribbon optical fiber core to be measured

A, B: measuring point C: fiber optic cable connection point

D: Ribbon optical fiber cable connection point E: Optical distribution box (optical distribution board)

In order to achieve the above object, the ribbon optical fiber loss measuring apparatus of the present invention,

Optical pulse tester,

A pseudo optical fiber connected to the optical pulse tester for waveform analysis;

An optical fiber core selector for selecting only one of the N optical fiber cores so that one end thereof is bound to the pseudo optical fiber;

A power supply unit for driving the optical fiber core selector;

A ribbon optical connector connected to the optical fiber core selector and a ribbon optical fiber core;

An adapter for coupling an external ribbon optical connector to the ribbon optical connector;

Several single-core optical connectors connected by a fiber-optic cable selector and a single-fiber optical fiber for measuring single-core optical fiber cores;

An adapter for coupling an external single core optical connector to the single core optical connector,

And an optical connector of a pseudo optical fiber for connecting to the optical pulse tester, so that the connection loss of each optical fiber of the ribbon optical fiber core can be easily measured without separating the optical fiber core in the ribbon into individual cores when measuring the connection loss of the ribbon optical fiber. To help.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the connection loss measurement of the ribbon optical fiber according to the technology of the present invention.

4 is a diagram showing the internal configuration of the optical fiber selection device for measuring the loss of ribbon optical fibers.

Referring to the drawings, the optical fiber wire selection device for measuring the fiber optical fiber splice loss of the present invention comprises a pseudo optical fiber 3, an optical fiber core wire selector 8, and a power supply unit 12, and also an optical fiber core wire selector for measuring the ribbon optical fiber A ribbon optical connector 9a connected to the input / output ribbon optical fiber core 9 and an optical fiber core wire 9, an adapter 9b for coupling the ribbon optical connector 9a, and the optical fiber core selector 8 for measuring single-fiber optical fibers. Several single-core optical connectors 10a, 10c, 10e, and 10g connected to the input / output optical fiber cores 10, adapters 10b for coupling optical connectors and optical connectors 10a, 10c, 10e, and 10g that are externally input; 10d, 10f, and 10h) and an optical connector 10i of a pseudo-optical fiber for connection with an optical pulse tester (1 in FIG. 5).

On the other hand, Figure 5 is a view showing the approximate configuration of a ribbon optical fiber connection loss measuring device using the ribbon optical fiber loss measuring device of Figure 4 according to the technique of the present invention.

Referring to FIG. 4 and FIG. 5 together, the connection process between the optical pulse tester 1 and the ribbon optical fiber core to be measured is as follows.

One side of the pseudo optical fiber 3 is connected to a common terminal (8a of FIG. 4) of the optical fiber core selector 8, and the optical connector 10i attached to the other side of the pseudo optical fiber 3 is an optical pulse tester 1 It is coupled to the optical connector port (2 of FIG. 5), the input / output ribbon optical fiber core wire 9 and the input / output optical fiber core wire 10 are connected to the input / output terminal 8b of the optical fiber core selector 8, and the ribbon optical fiber Ribbon optical connectors 9a and optical connectors 10a, 10c, 10e, and 10g are attached to ends of the core wire 9 and the input / output optical fiber core wire 10, respectively. Then, the ribbon optical connector 9a and the optical connectors 10a, 10c, 10e, and 10g may be coupled to the ribbon optical connector 9a and the optical connectors 10a, 10c, 10e, and 10g from the outside. For this purpose, the ribbon optical connector adapter 9b and the optical connector adapters 10b, 10d, 10f, and 10h are respectively provided.

Thus, in order to measure the connection loss of the ribbon optical fiber core to be measured with the optical pulse tester 1, the optical connector 10i of the pseudo optical fiber 3 of the present invention is taken out, connected to the optical pulse tester 1, and mediated. The ribbon optical connector 15a attached to one side using the ribbon optical fiber core wire 15 for coupling to the ribbon adapter 9b connected to the input / output terminal 8b of the optical fiber core wire selector 8 of the present invention, After the other side of the ribbon optical fiber core wire 15 and the ribbon optical fiber core wire to be measured are cross-sectional processed, axial alignment between the ribbon optical fibers is performed using the V-optical alignment plate 16 for ribbon optical fibers or a multi-core mechanical connector.

When the connection of the upper ribbon optical fiber core 7a at the connection point D is completed, the power is turned on to operate the optical fiber core selector 8, and the number to which the upper optical fiber core 7c in the ribbon is connected in the optical fiber core selector 8 is connected. When is selected, the common terminal 8a on the side of the pseudo-optical fiber 3 is connected to the input / output terminal 8b so that the connection loss of the upper optical fiber can be measured by the optical pulse tester 1. That is, the optical signal incident from the optical connector port 2 of the optical pulse tester 1 is emitted to the common terminal 8a of the optical fiber core selector 8 through the pseudo optical fiber 3, and again the input / output terminal 8b. And the optical fiber core selector 8 through the optical fiber of the ribbon optical connector 9a, the ribbon optical fiber core 15 for the mediation, the V-groove alignment plate 16 for the ribbon optical fiber, and the ribbon optical fiber core 17 to be measured. It is possible to measure the splice loss of the selected fiber.

In addition, in order to measure the connection loss of the optical fiber in the ribbon in order, when the optical fiber core selector 8 selects only the input / output terminal 8b of the core wire, the optical signal emitted from the common terminal 8a of the pseudo optical fiber 3 is used. Since it is incident on the input / output terminal 8b of the optical fiber core selector 8, it is easy to measure the connection loss of the ribbon optical fiber, and the connection loss is measured in this way up to the last optical fiber in the ribbon.

When the connection loss measurement of the upper ribbon optical fiber core 7a is completed, only the ribbon optical fiber core 17 to be measured is removed from the V-groove alignment plate 16 or mechanical connection part for the ribbon optical fiber, and the ribbon optical fiber core of the cross-sectioned order is raised. Then, as in the upper ribbon optical fiber core, the optical fiber core selector 8 sequentially selects the optical fiber core in the ribbon to measure the connection loss.

On the other hand, when the multi-core separation cord (14 in Fig. 4 (b)) is attached to the end of the ribbon optical fiber core to be measured, the ribbon optical connector on one side using the intermediary multi-core separation cord 14 with a ribbon optical connector is attached. The nectar 14a is inserted into the adapter 9b to which the ribbon optical connector 9a connected to the input / output terminal 8b of the optical fiber core selector 8 is coupled, and the optical connectors 14d on the other side are connected to the multi-core separation cord under test. The adapter 4 is connected to the single-core optical connector 7d, respectively, and the optical fiber core wires to be measured are selected by the optical fiber core selector 8 to measure the connection loss.

When the measurement of the splice loss of the optical fibers in the ribbon is completed, the single-core optical connectors 14d of the intermediary multi-core separation cord 14 are separated on the multi-core separation cord to be measured and coupled to the single-core optical connector 7d of the multi-core separation cords in order. Then, the optical fiber core in the ribbon is selected by the optical fiber core selector (8) and the measurement is performed.

In addition, the present invention can be usefully applied to the measurement of the connection loss of the single-core optical fiber core other than the ribbon optical fiber core, in Figure 4 several input and output optical fiber core 10 connected to the input and output terminal 8b of the optical fiber core selector 8 The optical connectors 10a, 10c, 10e, and 10g attached to each other are fixed to the adapters 10b, 10d, 10f, and 10h, so that the optical fiber core with the single-core optical connector is attached when measuring the connection loss of the single-core optical fiber core. When coupled to the adapters 10b, 10d, 10f, and 10h and the core is selected by the optical fiber core selector 8, the common terminal 8a to which the pseudo optical fiber 3 in the optical fiber core selector 8 is connected is connected to the corresponding input / output terminal. The optical signal, which is connected to the optical fiber core wire under test (8b) and is incident to the pseudo optical fiber 3 from the optical pulse tester 1 side, is emitted to the common terminal 8a of the optical fiber core selector 8, and then the corresponding input / output Optical island to be measured which is incident on the terminal 8b and connected to the input / output terminal 8b. The connection loss of the core can be easily measured.

In the optical fiber cable facility, optical type connectors (E) and optical connectors on the optical fiber cable side that are accommodated in the optical distribution panel are generally used in the SC type and the FC type, and depending on the state of the contact surface of the optical connector, Or APC, and in such a situation, FC / PC, FC / APC, SC / PC, SC / APC are connected to the input / output terminal 8b of the optical fiber core selector 8 to facilitate connection with the optical fiber core under measurement in such a situation. By connecting the input / output optical fiber cores 10 to which the optical connectors 10a, 10c, 10e, and 10g having the same structure are attached, the optical connectors 10a, 10c, 10e, 10g are connected to the corresponding ports according to the type of optical connector attached to the end of the optical fiber core to be measured. Therefore, it is easy to connect with the optical fiber core to be measured without using a separate heterogeneous optical connector coupling adapter.

On the other hand, with reference to Figure 5 will be described with respect to the progress step for measuring the connection loss of the ribbon optical fiber according to the present technology as follows.

The optical signal of the optical pulse tester 1 is incident on the optical connector 3a of the pseudo optical fiber 3 and passes through the common terminal 8a of the optical fiber core selector 8 connected to the other side of the pseudo optical fiber 3, Through the optical fiber core of the input and output terminal (8b) selected by the core selector (8) through the ribbon optical connector (9a), the intermediary multi-core separation cord 14, or the intermediate ribbon optical fiber core wire (15) is incident to the corresponding optical fiber core wire The splice loss of the optical fiber under measurement can be measured.

Next, after the connection loss measurement of the upper optical fiber core 7c in the ribbon is completed, when the optical fiber core in order is selected by the optical fiber core selector 8, the optical signal of the optical pulse tester 1 is sequentially ordered by the common terminal 8a. The optical fiber is connected to the input / output terminal 8b to which the optical fiber core is connected, and the optical signal is transmitted to the optical fiber core through the ribbon optical connector 9a, the multi-core separation cord 14 for the mediation, or the ribbon optical fiber core 15 for the mediation. Can be measured easily.

Therefore, as described above, the present invention is a pseudo-optic fiber used for measuring the loss of a section in which the waveform analysis is not performed due to the dead zone of the optical pulse tester (1) when measuring the connection loss of the optical fiber with the optical pulse tester (1) (3) and a combination of components such as an optical fiber core selector 8 for selecting an optical fiber core to be measured and a ribbon optical connector 9a for connecting the ribbon optical fiber core at one time to form an integrated body in the protective case 13. , Damage prevention of the pseudo optical fiber (3) in the connection loss measurement operation by the optical pulse tester (1), the pseudo optical fiber (3), the optical fiber core selector (8), the optical fiber core selector (8) and the ribbon optical fiber core to be measured ( 17) The convenience of the cumbersome connection work is enhanced, the input / output ribbon optical fiber 9 with the ribbon optical connector 9a attached to the input / output terminal 8b of the optical fiber core selector 8, and various types of single-core optical connectors. (10a, 10c, 10e, 10g) By connecting the input and output optical fiber core wire 10, the optical pulse tester 1 and the ribbon optical fiber and the connection method was implemented to be quick and easy.

In addition, it is possible to analyze the waveform of the ribbon optical fiber core 10 and the single optical fiber core with one pseudo optical fiber 3, and the optical fiber according to the type of the connector (10a, 10c, 10e, 10g) of the single optical fiber core to be measured. The method of connecting with the pulse tester (1) was simplified.

In addition, by reducing the occurrence of the connection loss between the optical connector, the coupling loss of the optical fiber core selector, etc. that can be caused in the process of implementing the above function, the incident to the optical fiber to be measured according to the connection method between the optical pulse tester and the optical fiber to be measured Minimized degradation of light output.

As described above, the ribbon optical fiber loss measuring apparatus of the present invention separates the optical fibers in the ribbon into individual cores one by one to the pseudo optical fibers connected to the optical pulse tester, and does not perform axial alignment in the single-core V-groove alignment plate. Since the connection loss of optical fiber cores can be easily measured at intervals of several seconds, the measurement time according to the connection test can be reduced to the time of (1 / ribbon bow), and the connection delay time due to the measurement is greatly reduced. This can significantly reduce the cost of ribbon fiber connection test.

In addition, since the pseudo-optic fiber is not exposed to the outside and integrated in the case as an integral type with the optical fiber core selector, it is possible to prevent damage of the pseudo-optical fiber due to careless handling, and the cutting phenomenon due to alignment with the ribbon optical fiber core to be measured is prevented. You can prevent it.

In addition, the optical fiber core selector provided in the loss measuring apparatus of the ribbon optical fiber of the present invention can lower the construction cost of the optical fiber network, which is rapidly increasing for the high-speed information communication network not only between the city but also the subscriber, and the conventional optical pulse It is possible to increase the measurement workability as well as to reduce the excessive measurement time and the connection time generated in the connection loss measurement operation of the ribbon optical fiber by the tester loss measuring system.

Claims (3)

In the ribbon optical fiber loss measuring apparatus for measuring the connection loss between the ribbon optical fibers, Optical pulse tester, A pseudo optical fiber connected to the optical pulse tester for waveform analysis; An optical fiber core selector for selecting only one optical fiber core from among a plurality of optical fiber cores to bind one end of the selected optical fiber to the pseudo optical fiber; A power supply unit for driving the optical fiber core selector; A ribbon optical connector connected to the optical fiber core selector and a ribbon optical fiber core; An adapter for coupling an external ribbon optical connector to the ribbon optical connector; Several single-core optical connectors connected by a fiber-optic cable selector and a single-fiber optical fiber for measuring single-core optical fiber cores; An adapter for coupling an external single core optical connector to the single core optical connector, And an optical fiber optical connector for connecting the optical pulse tester. The method of claim 1, The optical fiber core selector may include a common terminal through which an optical signal of an optical pulse tester is incident through an optical connector of a pseudo optical fiber; A plurality of input / output terminals connected to the outgoing ribbon optical fiber core and the outgoing optical fiber core; Ribbon optical fiber loss measuring device comprising a control means for connecting the optical signal passed through the common terminal to the predetermined input and output terminals The method of claim 1, The optical pulse tester combines a pseudo optical fiber used for measuring the connection loss of the optical fiber and an optical fiber core selector which selects only one core of the plurality of optical fiber cores integrally, so that the ribbon optical fiber core can be connected to the optical pulse tester at one time. Ribbon optical fiber loss measuring device, characterized in that