JPH01507A - How to insert optical components into the optical path and how to compare the core of the optical path - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method of inserting an optical component into an optical path, and a method of performing core fiber comparison of the optical path using the optical component. By inserting an optical component into the optical fiber, an optical line testing device can easily access the optical path through the optical component (for example, an optical multiplexer/demultiplexer).

(Prior Art) As a conventional system for measuring the band of a currently used optical line at one end within a station, there is a system as shown in FIG. In this system, 1 is an in-office optical terminal bundle, 2 is a subscriber terminal, 3 is an optical fiber line, 4 is an optical multiplexer/demultiplexer, 6 is a band measurement device, 5
is an optical filter provided at one point within the subscriber side line. The optical filter 5 transmits the current light wave intrusion OP and reflects the test light wave intrusion t.

In this system, the test light from the band measurement device 6 is input to the optical line 3 via the optical multiplexer/demultiplexer 4, reflected by the optical filter 5, and returned to the band measurement device 6 via the optical multiplexer/demultiplexer 4. , the test light can be monitored without affecting the current optical communication.

(Problems with the prior art) In the measurement system shown in Fig. 4, the optical multiplexer/demultiplexer 4 and the optical filter 5 (optical components) are permanently installed in the optical path.
In the case of an n-core cable, n sets of optical components are required, which increases the cost. (Objective of the Invention) The purpose of the present invention is to easily insert optical components into the optical path only when necessary. The object of the present invention is to make it possible to perform core wire comparison using the optical component inserted by the insertion method.

(Means for Solving the Problems) As described in claim 1, the method of inserting an optical component into an optical path of the present invention connects the optical component 9 as shown in FIG. 1A. One of the optical connectors 8C and 8d,
Connect to one of the optical connectors 8a and 13b connected to the optical lines 7a and 7b as shown in FIG. 1B, and
, 8d is connected to the other of the optical connectors 8a and 8b, and the optical component 9 is inserted between the optical lines 7a and 7b.

As described in claim 4, the method for comparing optical fibers in an optical path of the present invention is as follows: This was used to compare the core wires.

(Embodiment of the Invention) In the optical component insertion method of the present invention, the optical connectors 8a and 8b of the optical lines 7a and 7b connected as shown in FIG. 2 are connected to the optical connectors 8a and 8b as shown in FIG. is connected and 8b
and 8d are connected, and optical components 9 such as the optical multiplexer/demultiplexer 4, the optical coupler, and the optical fiber itself are inserted into the optical path as necessary.

That is, in a state where the optical component 9 is not required, the optical fiber 7
A and 7b are directly connected by connectors 8a and 8b as shown in FIG. 2, and optical multiplexer/demultiplexer 4. When an optical component 9 such as an optical coupler is required, the optical component 9 is changed from the state shown in FIG. 1A to the state shown in FIG.
is inserted into the optical path.

In this case, the optical component 9 and the optical connectors 8c and 8d connected thereto are set in a connector switching device (not shown), and this switching device is controlled by a control system so that switching can be performed in a timely manner when necessary. It's Nishide.

The optical connector 8C of the optical component 9 connects the optical path 7 as shown in FIG. 1A.
The optical connector 8d is opposed to the optical connector 8a of the optical component 9, and the optical connector 8d is opposed to the optical connector 8b of the other optical path 7b.When the optical connectors 8c and 8d of this optical component 9 are slid, the connectors 8a and 8c are connected. Connectors 8b and 8d are connected.

In the present invention, as the optical component 9, an optical multiplexer/demultiplexer (FIG. 3A), an optical coupler, or the like is used, which allows the current light to pass through and can inject the core pair groove into the current line.

When the optical component 3 is an optical multiplexer/demultiplexer, light having a wavelength different from that of the current light is input into it, and the light is detected by local detection on the terminal side to perform fiber comparison.

If the optical component 3 is an optical coupler, signals with the same wavelength and different modulation formats are injected into it. By using a constant low frequency signal and arranging a high frequency pass filter at the light receiving end, it is possible to eliminate the adverse effect of the fiber comparison signal on the current optical signal. In addition, by using a bandpass filter that transmits only the frequency of the reference signal in local detection, S
/N can be improved, and highly sensitive reception becomes possible.

Although the explanation so far has been made regarding the case where the optical fiber is a single-core optical fiber, the optical fiber used in the present invention may be a multi-core optical fiber such as a tape fiber.

In the case of tape fiber, not only the wire number of the tape but also
It is necessary to compare the incense sticks of the strands inside the tape. However, in the case of 5-core tape, the relationship between the wires is fixed by the coating, so it is only necessary to be able to contrast one core at one end in the width direction6.For example, in the case of 5-core tape, the current optical line 1 The optical connectors 8C and 8d of the optical component 9 are connected to the optical connectors 8a and 8b of the optical component 9, and the contrast light is incident on only one of the five cores at the end, and as shown in FIGS. By interposing the screen 11 on which the tape fiber 13 is formed between the detector 12 and the tape fiber 13 and individually detecting the two cores at both ends locally, not only the core wires can be compared, but also the discrepancy between the front and back of the tape can be detected.

(Effects of the Invention) The method of inserting an optical component into an optical path according to the present invention has the following effects.

(1) For example, when considering an optical fiber monitor for a 100-core cable, 100 expensive optical multiplexers/demultiplexers are required in the past, but in the present invention, one optical multiplexer/demultiplexer is prepared and these are sequentially installed. 1
Since it can be used by switching connection with a 0.00-core fiber, the cost is greatly reduced.

(2) In the present invention, since an optical connector must be connected to each optical fiber in use, the number of optical connectors increases, but since optical connectors are cheaper than optical multiplexers and demultiplexers, each optical Even if an optical connector is connected to the fiber, the cost will be lower.

The optical line fiber comparison method of the present invention performs the fiber comparison using the optical component 9 inserted into the optical line by the above method.
Core wire comparison can be performed easily and quickly.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the method of inserting an optical component into an optical path according to the present invention, in which A is an explanatory diagram before insertion, B is an explanatory diagram after insertion, and FIG.
The figure is an explanatory diagram of the normal connection of the optical line, Figure 3A is an explanatory diagram of the optical component inserted into the optical line, Figure 3B is an explanatory diagram of the insertion of the optical component in Figure A into the optical line, and Figure 4 The figure is an explanatory diagram of a conventional band measurement system. Figure 5 A1. B and C are explanatory diagrams of a fiber comparison method when a tape fiber is used in the present invention. 7a, 7b are optical lines 8a, 8b, 8c, 8d are optical connectors 9 are optical components

Claims (4)

[Claims] (1) Optical connector 8a that connects one of optical connectors 8c and 8d connected to optical component 9 to optical lines 7a and 7b
, 8b, and the other of the optical connectors 8c and 8d is connected to the other of the optical connectors 8a and 8b.
A method for inserting an optical component into an optical path, characterized in that the component is inserted between optical paths 7a and 7b. (2) One of the optical connectors 8c and 8d of the optical component 9 is opposed to one of the optical connectors 8a and 8b of the optical lines 7a and 7b, and the other of the optical connectors 8c and 8d is the optical connector 8a and 8b of the optical line. The optical connectors 8c, 8
By sliding d, the optical connectors 8a, 8b,
2. The method of inserting an optical component into an optical path according to claim 1, wherein the connections of 8c and 8d are switched. (3) A method for inserting an optical component into an optical path according to claim 1, characterized in that an optical multiplexer/demultiplexer is used as the optical component 9. (4) An optical connector 8a that connects one of the optical connectors 8c and 8d connected to the optical component 9 to the optical lines 7a and 7b.
, 8b, and the other of the optical connectors 8c and 8d is connected to the other of the optical connectors 8a and 8b.
A method for comparing optical fibers, characterized in that a fiber optic is inserted between optical fibers 7a and 7b, and the fibers are compared using an optical component 9 in the inserted state.