JPH02120812A - Adapter for multifiber - Google Patents

Abstract

PURPOSE:To cut the light signal of the wavelength different from the wavelength transmitted and received by a signal transmitter and receiver before the signal is supplied to the signal transmitter and receiver by providing a filter member into an optical fiber so as to incline with the optical axis. CONSTITUTION:The right end face of the optical fiber in the connector for multifibers and the left end face 26b of the optical fiber 26 come into contact with each other in a pressed state so that light is well transmitted when the connector for multifibers of an apparatus is fitted to the face 22 side of an adapter base 21. The connector for multifibers on the optical line side is fitted to the face 22 side of the adapter base 21 so that both the optical fibers come into contact with each other likewise in a pressed state. The filter 31 to cut a certain specified wavelength is provided to the central part of the optical fiber 26 and has a certain angle with the optical axis in order to prevent the reflection of the incident light. The light signal of the wavelength different from the wavelength transmitted and received by the signal transmitter and receiver is cut in this way before this signal is supplied to the signal transmitter and receiver.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is directed to multi-fiber optical fiber communication using optical wavelength division multiplexing technology or for line monitoring, which has a built-in wavelength filter that cuts or transmits only specific wavelengths. Regarding the adapter.

"Conventional technology" Bidirectional optical fiber】1! ! When communicating, or when monitoring an optical fiber during communication using an OTDR (optical pulse tester) or the like, - light of two or more different wavelengths is used for integration. The coupling and splitting of the light having the wavelengths described above is performed, for example, by a fiber coupler.

FIG. 4 is a block diagram of bidirectional optical fiber communication. In the illustrated communication system, depending on the branching ratio (coupling ratio) of the coupler,
Alternatively, due to the crosstalk characteristics (isolation) in the WDM (multiplexing/multiplexing) type coupler 8a, the optical signal S2 sent from the transmitting device 2b at a wavelength λ is transmitted to the optical fiber cable 5.
It is transmitted by a coupler 8a, and reaches the transmitting device 1a for the wavelength wavelength 8, making the laser excitation unstable.

Next, FIG. 5 shows a configuration diagram of an optical line monitoring system using 0TDR. In this figure, output 1 from 0TDRIO. The optical signal s2 having the wavelength λ transmitted by J reaches the receiving device 1b via the optical switch 7 and the coupler 8c, resulting in a state of interference on the receiving side.

For the above reasons, in the conventional optical fiber communication system, the wavelength filter 31 that transmits the necessary light and blocks unnecessary light for each device of the optical fiber communication system is installed as shown in FIGS. 4 and 5. installed in each transceiver.

"Problems to be Solved by the Invention" By the way, there are limitations to wavelength multiplexing in the conventional optical communication system or optical line monitoring system described above. That is, it has been difficult to multiplex wavelengths in an optical fiber communication system configured by communication equipment without a wavelength filter. In addition, in optical fiber communication systems consisting of communication equipment equipped with wavelength filters, the wavelengths that can be used are limited, and
There were difficulties in changing the wavelength used.

This invention was made in view of the above-mentioned problems, and it is possible to cut an optical signal of a wavelength different from that transmitted and received by the transmitting/receiving device before it is supplied to the transmitting/receiving device.
Furthermore, it is an object of the present invention to provide a multi-core adapter with a built-in filter that can be easily installed without modifying an existing optical fiber communication network.

"Means for Solving the Problems" In order to solve these problems, in this invention, one end is configured to be attachable and detachable to a multi-core connector of an equipment, and the other end is configured to be detachable from a multi-core connector of an optical line. An adapter base configured to freely form a periosteum, and an optical axis aligned with each optical fiber in each multi-fiber connector when the adapter base is inserted into each multi-fiber connector of the device and the optical path. The adapter base includes a plurality of optical fibers provided between one end and the other end of the adapter base, and a filter member provided in these optical fibers at an angle with respect to the optical axis. .

"Function" By installing a multi-fiber adapter with a built-in wavelength filter between the multi-fiber connector on the transmitting/receiving device side and the multi-fiber connector on the optical fiber cable, a filter can be installed inside the transmitting/receiving device. Cuts unnecessary optical signals without incorporating them.

"Embodiments" Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the structure of a multi-core adapter according to an embodiment of the present invention.

In this figure, reference numeral 20 denotes a multi-core adapter according to this embodiment, which is composed of a rectangular parallelepiped adapter base 21, and an optical fiber, a filter, etc. housed within the adapter base 21. A pair of opposing surfaces 22 and 23 of the adapter base 21 are provided with fitting holes 22a, 22b and fitting holes 23a, 23b, respectively, into which fitting pins of a multi-fiber connector are inserted. The device 21 (transmitting/receiving device, 0TDR
etc.) By inserting the fitting pin of the multi-core connector on the side, the adapter base 2.l and the multi-core connector on the equipment side are butt-connected. Also, in 23, face 2
Similar to 2, the multi-fiber connectors on the optical path side are butt-connected. Furthermore, the step 24 at the top of the adapter base 21 is required when cutting the groove 25 into which the filter 31 is inserted into the optical fiber 26. A cutter that cuts this groove 25 with high precision can generally cut a groove with a maximum depth of 1 mm, but in this embodiment, the thickness between the top surface of the adapter base 21 and the optical fiber 26 is approximately 1.7 mm.
5+aI11, the cutter cannot make the groove reach the optical fiber inside the adapter base 21. Therefore, a step 2 is placed on the top of the adapter base 21 in advance.
4, and the upper part of the adapter base 21 is made thin. As a result, the cutter allows the groove 2'5 to reach the optical fiber 26, allowing the filter 31 to be inserted. A groove 25 is cut in the step 2'4, and the filter 31 is inserted and then covered, so that the upper surface of the adapter base 21 and the upper surface of the lid are on the same plane.

Next, 1s2 of optical fibers 26.2 are positioned with high precision from the base 22 of the adapter base 21 to the surface 23.
6....Pa... is provided. Further, these optical fibers are provided between the fitting holes 22a522b as shown in the figure. Right end surface 26a of these optical fibers 26
The right end surface 26b is polished and exposed from each of the four surfaces 22 and 23. In this case, when the multi-fiber connector of the device is fitted into the surface 22 side of the adapter base 21, the right end surface of the optical fiber in this multi-fiber connector and the left end surface 26b of the optical fiber 26 come into contact with each other in a suppressed state, and the light is being communicated well. Also,
A multi-fiber connector on the optical path side is fitted into the surface 22 side of the adapter base 21, so that both optical fibers are brought into contact with each other in a suppressed state in the same manner as described above.

Further, a filter 31 that cuts a certain wavelength is provided at the center of the optical fiber 26, and is set at a certain angle to the optical axis to prevent reflection of incident light. The wavelength that this filter 31 cant is the same as that of the multi-core adapter 20.
varies depending on the connected device, for example, transmitting device 1a
If the optical signal is connected to the optical signal S2, a device that cuts the optical signal S2 is used.

In addition, when connected to the transmitting device 2b, the filter 31
A device that cuts the optical signal S1 is used.

Next, FIG. 2 shows an embodiment in which the multi-core adapter 20 is used for bidirectional optical fiber communication. In this figure, first, an optical signal S2 having a wavelength λ is output from a transmitter 4b in a transmitter 2b. This optical signal S2 is sent to the multi-core adapter 2.
It passes through the filter 31b in Ob and is guided to the optical fiber line by the coupler 8b. Optical signal S2 is transmitted by optical fiber cable 5. Then, the optical signal S2 is branched (branched) by a coupler 8a, one of which is supplied to the receiving section 4a in the receiving device 2a, and the other is supplied to the filter 31a in the multi-core adapter 20a on the side of the transmitting device la. Ru. The optical signal S2 having a wavelength λ is cut by this filter 31a.

In addition, in track monitoring work using 0TDR, etc., the 0T that reaches the direct communication system shown in Figure 3 (a) and (b)
The DR light S2 or the transmission signal light S1 reaching the 0TDR light receiving device 10 is cut by the filter 31 built into the multi-core adapter 20 of this embodiment.

"Effects of the Invention" As explained above, according to the present invention, the transmitter/receiver transmits and receives an optical signal of a wavelength different from that of the optical signal transmitted and received.
It can be cut before being supplied to the receiving device, and since the multi-core adapter has a built-in filter, it has the advantage that it can be easily installed without modifying the optical fiber communication network.

[Brief Description of the Drawings] Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a configuration diagram of double-grooved fiber communication in which the multi-fiber adapter of the present invention is inserted, Fig. 3 (a) and (b) are respectively a block diagram of the optical line monitoring system when 0TDR is used on the transmitting side, and (b) is a diagram of the optical line monitoring system when 0TDR is used on the receiving side. FIG. 4 is a block diagram of bidirectional optical fiber communication, and FIG. 5 is a block diagram of an optical line monitoring system using 0TDR. Device, 3a, 4b... Division, 8a, 3b Multi-core adapter, 2 23... Surface, 22a... 11 [Pass tag, 26... Evening.

Claims (1)

[Claims] an adapter base, one end of which is configured to be detachable from a multi-core connector of a device, and the other end of which is configured to be detachable from a multi-core connector of an optical line; a plurality of optical fibers provided between one end and the other end of the adapter base so that their optical axes coincide with each optical fiber in each of the multi-fiber connectors when attached to the fiber connector; A multi-fiber adapter comprising: a filter member provided in the optical fiber at an angle with respect to the optical axis.