JP2000307524A - Optical transmitter-receiver in common use for single- core two-way and two-core two-way - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical transmitter-receiver in common use for single core two-way and two-core two-way that is made correspondent to a single-core 2-way optical communication network and a 2-core 2-way optical communication network. SOLUTION: The optical transmitter-receiver 30 in common use for single core two-way and two-core two-way is provided with a 1st port 32 to which a connection termination of an optical fiber of a single-core 2-way optical communication network or a transmission connection termination of an optical fiber of a two-core 2-way optical communication network is inserted, a 2nd port 33 to which a reception connection termination of an optical fiber of a two-core 2-way optical communication network is inserted, a light emitting element 36 and a 1st light receiving element 37 which are placed in the 1st port corresponding to the connection termination of the inserted optical fiber and a 2nd light receiving element 38 placed in the 2nd port corresponding to the connection termination of the insertion optical fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-core bidirectional and dual-core bidirectional optical transceiver for interconnecting a single-core bidirectional optical communication network and a two-core bidirectional optical communication network.

[0002]

2. Description of the Related Art At present, optical communication networks using optical fibers are roughly classified into two types, that is, a single-core bidirectional optical communication network for multiplexing opposing transmission light and reception light on a single-core optical fiber for transmission and reception. And, a two-core bidirectional optical communication network that performs transmission and reception by dividing opposing transmission light and reception light into two-core optical fibers,
are categorized. The single-core bidirectional optical communication network is an ATM (Asy
This is used in a public communication network represented by an nchronous transfer mode (subscriber system) subscriber system, and a two-core two-way optical communication network is an FDDI (Fiber).
Distributed Data Interfa
ce)-used in private communication networks represented by LANs and the like.

Conventionally, such a public communication network and a private communication network are operated independently of each other, so that a one-core two-way optical communication network and a two-core two-way optical communication network used for these communication networks are used. Are also independently arranged. Therefore, optical communication is possible only between the optical transceivers used in the single-core bidirectional optical communication network or between the optical transceivers used in the two-core bidirectional optical communication network.

[0004]

In the future, when it becomes necessary to interconnect these public communication networks and private communication networks, the single-core two-way optical communication network and the two-core two-way optical communication network will be described. Network interconnection becomes an important issue. As an immediate countermeasure, these interconnections will be performed through several gateways, etc., so that they will be operated in a neatly separated state, but in the future it will be operated within one optical communication network. It is expected that a single-core two-way optical communication network and a two-core two-way optical communication network will coexist. At this time, in a case where a device compatible with any communication network is manufactured in an optical communication network in which a node of the single-core bidirectional optical communication network and a node of the two-core bidirectional optical communication network are mixed, an optical device provided in the device is provided. It is important to determine whether the transceiver includes the single-core bidirectional optical transceiver or the two-core bidirectional optical transceiver. If both optical transmitters and receivers are provided, it is possible to cope with any optical communication network. However, since two types of optical transmitters and receivers are mounted, the cost increases and the mounting space increases. Is required, minimizing the size of the device is hindered. Also, if only one of the optical transceivers is mounted, it cannot be connected to the other type of optical communication network, and the versatility is impaired.

In view of the above, the present invention provides a single-core bidirectional and dual-core bidirectional optical transceiver capable of supporting both a single-core bidirectional optical communication network and a two-core bidirectional optical communication network. It is intended to provide.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a connection end of an optical fiber of a single-core bidirectional optical communication network or a transmission connection end of an optical fiber of a double-core bidirectional optical communication network. , A second port into which the receiving connection end of the optical fiber of the two-core bidirectional optical communication network is inserted, and a light inserted into the first port. A light-emitting element and a first light-receiving element disposed corresponding to the connection end of the fiber; and a second light-receiving element disposed corresponding to the connection end of the inserted optical fiber in the second port. Two light receiving elements,
This is achieved by a single-core bidirectional and dual-core bidirectional optical transmission / reception device characterized by including the following.

According to the above configuration, the single-core bidirectional and double-core bidirectional optical transmission / reception device includes the first port and the second port, and the first port includes the first port and the second port. The connection end of the optical fiber of the single-core bidirectional optical communication network or the transmission connection end of the optical fiber of the two-core bidirectional optical communication network is inserted. Further, a receiving connection end of an optical fiber of the two-core bidirectional optical communication network is inserted into the second port. Therefore, when connecting the connection end of the optical fiber of the single-core bidirectional optical communication network, the connection end is connected to the first end.
By inserting this port, the connection between the light emitting element and the first light receiving element becomes possible. When connecting the connection end of the optical fiber of the two-core bidirectional optical communication network, insert the transmission connection end into the first port and connect the reception connection end to the second port. By inserting the light emitting element into the port, the light emitting element and the second light receiving element can be connected.

In this state, the transmission light emitted from the light emitting element enters the optical fiber and is transmitted through the optical fiber. The received light transmitted and emitted through the optical fiber is incident on the first light receiving element or the second light receiving element, converted into an electric signal corresponding to the received light, and output. Thereby, it is connected to the one-core bidirectional optical communication network or the two-core bidirectional optical communication network, and the one-core bidirectional optical communication or the two-core bidirectional optical communication is performed.

Further, according to the present invention, a connection end of an optical fiber for connection of a single-core bidirectional optical communication network or a reception connection end of an optical fiber of a two-core bidirectional optical communication network is provided. A first port to be inserted, a second port into which the transmission connection end of the optical fiber of the two-core two-way communication network is inserted,
A first light-emitting element and a light-receiving element disposed in the first port corresponding to the connection end of the inserted optical fiber, and an optical fiber inserted in the second port And a second light-emitting element disposed corresponding to the connection end of (1).

[0010] According to the above configuration, the single-core bidirectional and dual-core bidirectional optical transmission / reception device includes the first port and the second port. The connection end of the optical fiber of the single-core bidirectional optical communication network or the reception connection end of the optical fiber of the two-core bidirectional optical communication network is inserted. A transmission connection end of the optical fiber of the two-core bidirectional optical communication network is inserted into the second port. Therefore, when connecting the connection end of the optical fiber of the single-core bidirectional optical communication network, the connection end is connected to the first end.
The first light-emitting element and the light-receiving element can be connected by inserting the first light-emitting element and the light-receiving element. When connecting the connection end of the optical fiber of the two-core bidirectional optical communication network, the reception connection end is inserted into the first port, and the transmission connection end is connected to the second connection end. By inserting the light-receiving element into the port, the connection between the light-receiving element and the second light-emitting element becomes possible.

In this state, transmission light emitted from the first light emitting element or the second light emitting element enters the optical fiber and is transmitted through the optical fiber. Also,
The received light transmitted and emitted through the optical fiber enters the light receiving element, is converted into an electric signal corresponding to the received light, and is output. Thereby, it is connected to the one-core bidirectional optical communication network or the two-core bidirectional optical communication network, and the one-core bidirectional optical communication or the two-core bidirectional optical communication is performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. still,
Since the embodiments described below are preferred specific examples of the present invention, various technically preferred limitations are added.
The scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

FIG. 1 shows a configuration of a bidirectional optical communication network to be connected by a single-core bidirectional and dual-core bidirectional optical transmission / reception device according to the present invention. In FIG. 1, the bidirectional optical communication network 10 includes a single-core bidirectional dedicated optical communication network 11 and a two-core bidirectional dedicated optical communication network 20. The single-core bidirectional optical communication network 11 is used in a public communication network represented by an ATM subscriber system and the like, in which a plurality of nodes 12 are connected to each other by a single-core optical fiber 13. Have been. On the other hand, the dual-core dual-purpose optical communication network 20 is used in a private communication network represented by an FDDI-LAN or the like. They are connected by an optical fiber 22.

First, the single-core bidirectional dedicated optical communication network 11
The description of the single-core bidirectional and dual-core bidirectional dual-purpose optical transmitting / receiving device 30 shown in FIG. Each of the communication network 11 and the two-core bidirectional dedicated optical communication network 20 will be described. As shown in FIG. 1, in a single-core bidirectional optical communication network 11, each node 12, which is an optical transceiver, is provided. Each node 12 has a single-core bidirectional optical transceiver. 14 are arranged. The single-core bidirectional optical transmitter / receiver 14 is mutually connected by an optical fiber 13 as shown in FIG. FIG. 2 (A)
FIG. 2 is an enlarged view showing the relationship between the single-core bidirectional optical transceiver 14 and the optical fiber 13 shown in FIG. In FIG. 2A, a single-core bidirectional optical transceiver 14 is a receptacle 17b having a transmission / reception port 17a for receiving a plug 13a provided at an end of a single-core optical fiber 13.
With the plug 13a inserted into the transmission / reception port 17a, the transmission / reception port 17a corresponds to the end face of the optical fiber 13.
The transmission / reception light separation element 17c disposed at the inner end of the transmission / reception light separation element 17c and the light emitting element 17d and the light reception element 17e disposed side by side inside the transmission / reception light separation element 17c are included. The light emitting element 17d is driven by an optical transmission system drive circuit 17f, and an output signal from the light receiving element 17e is amplified and output by an optical reception system amplifier circuit 17g.

Thus, the transmission light emitted from the light emitting element 17d driven by the optical transmission system drive circuit 17f enters the optical fiber 13 from the end face of the optical fiber 13 via the transmission / reception light separation element 17c, The fiber 13 is transmitted. On the other hand, the reception light transmitted from the optical fiber 13 exits from the end face of the optical fiber 13, is separated by the transmission / reception light separation element 17c, enters the light reception element 17e, and the light reception element 17e outputs an output signal corresponding to the reception light. The output signal is amplified by the optical receiving system amplifier circuit 17g.

On the other hand, as shown in FIG. 1, in a two-core two-way dedicated optical communication network 20, each node 21 which is an optical transmitting / receiving device is provided. Direction dedicated optical transceiver 23 is arranged. The two-core bidirectional optical transmitter / receiver 23 is mutually connected by an optical fiber 23 as shown in FIG. FIG. 2 (B)
2 is an enlarged view showing a relationship between the two-core bidirectional optical transceiver 23 and the optical fiber 13 shown in FIG. In FIG. 2B, the two-core bidirectional optical transceiver 23 has two ports for receiving plugs 16c and 16d provided at the end of the two-core optical fiber 22, that is, a transmission port 18a and a reception port. Receptacle 18c having port 18b and optical fibers 22a, 22 of respective cores of optical fiber 22 with plugs 16c, 16d inserted into ports 18a, 18b.
b, the light emitting element 18d and the light receiving element 18 arranged side by side at the inner ends of the ports 18a and 18b,
e. The light emitting element 18d is driven by an optical transmission system driving circuit 18f and the light receiving element 18d.
The output signal from e is amplified and output by the optical receiving system amplifier circuit 18g.

Thus, the transmission light emitted from the light emitting element 18d driven by the optical transmission system driving circuit 18f enters the transmission optical fiber 22a from one end of the optical fiber end face of the optical fiber 22, and The fiber 22a is transmitted. On the other hand, the received light transmitted from the receiving optical fiber 22b exits from the end face of the optical fiber 22b, enters the light receiving element 18e, and the light receiving element 18e outputs an output signal corresponding to the received light. Is amplified by the optical receiving system amplifier circuit 18g.

Here, as shown in FIGS. 2A and 2B,
The transmission / reception port 17a of the single-core bidirectional optical transmitter / receiver 14 and the dual-core bidirectional optical transmitter / receiver 23 corresponds to a relatively thick (eg, 5 mm in diameter) single-core optical fiber plug 13a, and a port 18a. , 18b are relatively thin (eg, 3 mm in diameter) two-core optical fiber plugs 1.
6c and 16d, the size is selected respectively, and the ports 18a and 18b have, for example, different side edges from each other in order to prevent the optical fiber 22 from being inserted in the opposite direction. In this case, the upper side is formed in a rectangular cross section, and the lower side is formed in an oblique cross section.

By the way, as shown in FIG.
FIG. 3 shows a case where two single-core bidirectional optical transceivers 14 are connected, for example. That is, FIG.
Transmission / reception ports 17a, 17a of receptacles 17b, 17b of single-core bidirectional optical transmitter / receiver 14 to be connected to each other
To the plugs 13a, 13a at both ends of the optical fiber 13.
It is a figure showing the state where a was inserted.

Here, as shown in FIG. 3, the light emitting element 17 of one (for example, the left) single-core bidirectional optical transmitter / receiver 14 is provided.
The transmission light emitted from d enters one end face of the optical fiber 13 via the transmission / reception light separation element 17c, and is transmitted through the optical fiber 13. Then, the light emitted from the other end face of the optical fiber 13 enters the light receiving element 17e via the transmission / reception light separating element 17c of the other (eg, right) single-core bidirectional optical transmitter / receiver 14, and is received by the light receiving element 17e. The output signal from 17e is amplified by the optical receiving system amplifier circuit 17g. As a result, the one-core bidirectional dedicated optical transceiver 14
Is transmitted to the other single-core bidirectional optical transmitter / receiver 14. The other one-core bidirectional optical transceiver 1
The optical transmission from 4 to one single-core bidirectional optical transmitter / receiver 14 is similarly performed. Thus, optical communication between the two single-core bidirectional optical transceivers 14 is performed.

On the other hand, when, for example, two two-core bidirectional optical transceivers 23 are connected as shown in FIG. 2B, the configuration becomes as shown in FIG. That is, FIG. 4 shows, for example, two two-core bidirectional dedicated optical transceivers 2 to be connected to each other.
Ports 18 of receptacles 18c, 18c of 3, 23
a, 18b, the plug 1 at both ends of the optical fiber 22
It is a figure showing the state where 6c and 16d were inserted. As shown in FIG. 4, the transmission light emitted from the light emitting element 18 d of one (for example, the left) two-core bidirectional optical transmitter / receiver 23 enters the optical fiber end face of one core of the optical fiber 22, The light is transmitted in the fiber 22a. Then, the optical fiber 22
The light emitted from the other end face of a is the other (for example, right)
And the output signal from the light receiving element 18e is amplified by the light receiving system amplifier circuit 18g. As a result, optical transmission from one two-core bidirectional optical transmitter / receiver 23 to the other two-core bidirectional optical transmitter / receiver 23 is performed. Further, the optical transmission from the other two-core bidirectional optical transmitter / receiver 23 to the one two-core bidirectional optical transmitter / receiver 23 is performed in the same manner. Thus, optical communication between the two two-core bidirectional optical transceivers 23 is performed. By the way, when the plugs 16c and 16d of the optical fiber 22 shown in FIG. 4 are inserted in the opposite directions, that is, respectively inserted into the ports 18a and 18b of the receptacle 18c, as shown in FIG.
Since the side edges of c and 16d are inconsistent in shape, they cannot be completely inserted, so that erroneous insertion and erroneous connection are prevented.

The connection method between the single-core bidirectional optical transmitter / receiver 14 and the dual-core bidirectional optical transmitter / receiver 23 has been described above. Dedicated optical transmitting and receiving devices 14 and 23
, So that they cannot be connected to each other. That is, when trying to connect the single-core bidirectional optical transmitter / receiver 14 and the dual-core bidirectional optical transmitter / receiver 23, as shown in FIGS.
3 is connected to a single-core bidirectional optical transceiver 1
4 and the plug 13a on the other side is inserted into one of the two ports 18a and 18b of the two-core bidirectional optical transmitter / receiver 23, because both are not conformable in shape. Cannot be completely inserted, and erroneous insertion and erroneous connection are prevented.

The single-core bidirectional optical communication network 11 shown in FIG. 1 is used in a public communication network represented by an ATM subscriber system as described above. Since the core bidirectional optical communication network 20 is used in a private network such as the FDDI-LAN as described above, it is necessary to connect them. According to the embodiment,
The single-core bidirectional and dual-core bidirectional optical transceiver 30 (FIG. 7)
Reference) will be used. Specifically, the single-core bidirectional and dual-core bidirectional optical transmission / reception device 30 is arranged in place of the connection portion 11a of the single-core bidirectional optical communication network 11 shown in FIG. The single-core bidirectional and dual-core bidirectional optical transmission / reception device 30 is also arranged in place of the connection section 20a of the dual-core bidirectional optical communication network 20 shown in FIG. That is, the single-core bidirectional and dual-core bidirectional optical transmission / reception device 30 is connected at one end to another node 12 inside the single-core bidirectional optical communication network 11 and at the other end. In the section, an optical fiber can be inserted from outside the single-core bidirectional optical communication network 11. The single-core bidirectional and dual-core bidirectional optical transceiver 30 is connected at one end to a node 21 inside the dual-core bidirectional optical communication network 20 and at the other end. An optical fiber can be inserted from outside the two-core bidirectional optical communication network 20.

FIG. 7 is a diagram showing such a single-core bidirectional and dual-core bidirectional optical transmission / reception device 30. As shown in FIG. In the figure, a single-core bidirectional and dual-core bidirectional optical transceiver 30 is shown.
Is connected to a node 12 inside the single-core bidirectional dedicated optical communication network 11 or a node 21 inside the double-core bidirectional dedicated optical communication network 20 via the optical fiber 13 or the optical fiber 21 or the like. The single-core bidirectional and dual-core bidirectional optical transceiver 30 includes a single-core bidirectional and dual-core bidirectional optical transceiver 31. The single-core bidirectional and dual-core bidirectional optical transceiver 31 has a plug 13a provided at the connection end of the single-core optical fiber 13.
Alternatively, transmission / reception as a first port for receiving the plug 16c provided at the end of the optical fiber 22a which is the transmission connection end of the two connection ends of the pair of the two-core optical fiber 22. A port 32 is provided. The single-core bidirectional and dual-core bidirectional optical transceiver 31 receives the plug 16d provided at the end of the optical fiber 22b which is the receiving connection end of the two-core optical fiber 22. A reception port 33 is provided as a second port. The transmitting / receiving port 32 and the receiving port 33 are included in a receptacle 34. Further, the single-core bidirectional and dual-core bidirectional optical transmitter / receiver 31 has a transmission / reception optical separation element 35 at the inner end of the transmission / reception port 32 corresponding to the end face of the inserted optical fiber 13 or 22. A pair of light emitting element 36 and first light receiving element 37 disposed via
have. Then, the single-core bidirectional and dual-core bidirectional optical transceiver 31 transmits a second light receiving element 38 disposed in the reception port 33 in correspondence with the end face of the inserted optical fiber 22. Also included.

As the transmission / reception light separating element 35, for example, a half mirror prism or the like is used, and the transmission light from the light emitting element 36 is guided to the end face of the optical fiber 22, and the reception light emitted from the end face of the optical fiber 22 is first. Light receiving element 3
7 As the light emitting element 36, for example, a laser diode, a light emitting diode, or the like is used. The light emitting element 36 is driven by an optical transmission system driving circuit 39, and the first light receiving element 37 and the second light receiving element 38 are, for example, photodiodes. The output signal from the first light receiving element 37 or the second light receiving element 38 is amplified by the light receiving system amplifier circuit 40 and output.

According to the optical transmission system drive circuit 39 and the optical reception system amplifier circuit 40, the transmission data from the single-core bidirectional and double-core bidirectional dual-purpose optical transceiver 30 is transmitted by a laser diode driving unit (not shown). ), A transmission control signal is input, and the light emitting element 36 is driven to emit transmission light. Further, the received light is transmitted to the first light receiving element 37 or the second
When the light enters the light receiving element 38, an output signal corresponding to the incident light is output, amplified by an amplifier or the like (not shown), transmitted to the device 30 as reception data, and a signal detection circuit (not shown). For example, a signal detection signal is transmitted to the device.

Thus, the transmission light emitted from the light emitting element 36 driven by the optical transmission system driving circuit 39 is transmitted to the optical fiber 13 or 22a via the transmission / reception light separation element 35.
From the end face of the optical fiber 13 and transmitted through the optical fiber 13 or 22a. On the other hand, the optical fiber 13 or 2
2b is received by the optical fiber 13 or 2
2b, the light is emitted from the end face of the second light receiving element 37, is separated by the transmission / reception light separation element 35, and enters the first light receiving element 37, or directly enters the second light receiving element 38.
The second light receiving element 38 outputs an output signal corresponding to the received light, and the output signal is amplified by the optical receiving system amplifier circuit 40, and the received data is transmitted to the device 30.

The single-core bidirectional and dual-core bidirectional optical transmission / reception device 30 according to the embodiment of the present invention is configured as described above. As shown in FIG. 8, plugs 16c and 16d provided at one end of a two-core optical fiber 22 for connection to a two-core bidirectional optical communication network 20 are provided for both one-core bidirectional and two-core optical fibers, respectively. Transmission / reception port 32 of dual-purpose optical transceiver 31
And into the reception port 33. In this case, the plug 16c and the plug 16d are, as shown in FIG.
The plugs 16c and 16d have the same diameter, and have different shapes at the roots of the plugs 16c and 16d.
The root portion of 6d is provided with a step, or FIG.
As shown in (B), the plug 16e including the plugs 16c and 16d is formed such that the overall shape is asymmetric. As shown in FIG. 8B, the plugs 16c and 16d may have different thicknesses, for example, the plug 16c may have a diameter of about 2 mm and the plug 16d may have a diameter of about 1.5 mm. Such asymmetrical shapes of the plugs 16c and 16d prevent the two-core optical cable 22 from being inserted in the ports 32 and 33 of the receptacle 34 of the one-core two-core bidirectional optical transceiver 31 in the opposite direction. Has become.

With the two-core cable 22 connected in this manner, the transmission light emitted from the light emitting element 36 driven by the optical transmission system drive circuit 39 passes through the transmission / reception light separating element 35 The light enters the optical fiber 22a from the end face of the transmitting optical fiber 22a, and is transmitted through the optical fiber 22a. On the other hand, the received light transmitted from the receiving optical fiber 22b exits from the end face of the optical fiber 22b, directly enters the second light receiving element 38,
Outputs an output signal corresponding to the received light, and this output signal is amplified by the optical receiving system amplifier circuit 40. In this case, the first light receiving element 37 does not operate.

On the other hand, the single-core bidirectional dedicated optical communication network 1
9, a plug 13a provided at one end of a single-core optical fiber 13 for connection to a single-core dual-purpose optical communication network 11, as shown in FIG. It is inserted into the transmission / reception port 32 of the bidirectional optical transceiver 31. In this case, the plug 13a has a large diameter corresponding to the transmission / reception port 32, as shown in FIG.
Due to such a large diameter of the plug 13a, the one-core bidirectional and two-core bidirectional optical transceiver 31 of the single-core optical cable 13 is provided.
Of the receptacle 34 into the port 33 is prevented.

With the single-core cable 13 connected as described above, the transmission light emitted from the light emitting element 36 driven by the optical transmission system driving circuit 39 passes through the transmission / reception light separation element 35 The light enters the inside from the end face of the fiber 13 and is transmitted through the optical fiber 13. On the other hand, optical fiber 1
3 is emitted from the end face of the optical fiber 13, is separated by the transmission / reception light separation element 35, and
The first light receiving element 37 outputs an output signal corresponding to the received light, and the output signal is amplified by the light receiving system amplifier circuit 40. In this case, the second light receiving element 38 does not operate.

When two two-core bidirectional optical communication networks 20 are connected using the single-core bidirectional and two-core bidirectional dual-purpose optical transceivers 31, these two two-core bidirectional only optical communication networks are used. Each node 21 of the communication network 20 is connected by a two-core optical fiber 22. As shown in FIG. 10 (A), the transmission / reception port 32 of the receptacle 34 of the single-core bidirectional and double-core bidirectional optical transceiver 31 provided at each of the nodes 21 to be connected to each other,
The plug 16c of the optical fiber 22 is inserted into the receiving port 33 and the plug 16d of the optical fiber 22 is inserted into the receiving port 33.
Insert

Here, the transmission light emitted from the light emitting element 36 of one (for example, left) single-core bidirectional and dual-core bidirectional optical transmitter / receiver 31 is transmitted through the transmission / reception light separating element 35 to the optical fiber 22. Is incident on the end face of the transmission optical fiber 22a, and is transmitted through the optical fiber 22a. The light emitted from the other end face of the optical fiber 22a is transmitted to the other (for example, the right) single-core bidirectional and dual-core bidirectional optical transceiver 3.
The second light receiving element 3 is transmitted through the first transmission / reception light separation element 35.
8, and the output signal from the second light receiving element 38 is amplified by the light receiving system amplifier circuit 40. As a result, the single-core bidirectional and dual-core bidirectional optical transceiver 3
Optical transmission is performed from one to the other one-way bidirectional and two-way bidirectional optical transceiver 31. Further, the optical transmission from the other single-core bidirectional and dual-core bidirectional optical transceiver 31 to one single-core bidirectional and dual-core bidirectional optical transceiver 31 is performed in the same manner. Thus, optical communication between the two single-core bidirectional and dual-core bidirectional optical transceivers 31 is performed. When the plugs 16c and 16d of the optical fiber 22 are inserted in the opposite directions, that is, when the plugs 16c and 16d are inserted into the ports 33 and 32 of the receptacle 34, respectively, the side edges of the plugs 16c and 16d as shown in FIG. Due to the shape mismatch, it cannot be completely inserted, so that erroneous insertion and erroneous connection are prevented.

The single-core bidirectional and dual-core bidirectional optical transceiver 31 described above is used to establish a communication between the single-core bidirectional optical communication network 11 and the double-core bidirectional optical communication network 20. When the connection is made by the optical fiber 13 as the core, it becomes as shown in FIG. That is, in this case, the single-core bidirectional optical communication network 11 is provided with the single-core bidirectional optical transceiver 14 as a connection unit with the outside. As a connection portion between the two-core bidirectional dedicated optical communication network 20 and the outside, a single-core bidirectional and dual-core bidirectional optical transceiver 31 is provided. More specifically, the transmission / reception port 32 of the receptacle 34 of the single-core bidirectional and dual-core bidirectional optical transceiver 31 provided at the node 21 of one of the two-core bidirectional optical communication network 20
, A plug 13a at one end of the optical fiber 13 is inserted, and a port 17a of a single-core bidirectional optical transceiver 14 provided at the node 12 of the other single-core bidirectional optical communication network 11 is inserted. , Plug 1 at the other end of optical fiber 13
Insert 3a. Here, the transmission light emitted from the light emitting element 17b of the one-way (for example, left) single-core bidirectional optical transmitter / receiver 14 enters the end face of the optical fiber 13 via the transmission / reception light separating element 17c, 13 is transmitted. Then, the light emitted from the other end face of the optical fiber 13 passes through the transmission / reception light separation element 35 of the other (for example, right) single-core bidirectional and dual-core bidirectional optical transceiver 31.
The light that enters the first light receiving element 37 and is output from the first light receiving element 37 is amplified by the light receiving system amplifier circuit 40. As a result, the one-core bidirectional dedicated optical transceiver 14
To the other one-way and two-way bidirectional optical transceiver 3
1 is transmitted. Further, the optical transmission from the other single-core bidirectional and dual-core bidirectional optical transceiver 31 to the one-core bidirectional optical transceiver 14 is similarly performed. Thus, optical communication between the single-core bidirectional optical transceiver 14 and the single-core bidirectional and dual-core bidirectional optical transceiver 31 is performed. Therefore, the single-core bidirectional optical communication network 1
1 and the two-core bidirectional optical communication network 20 can be connected by a single-core optical fiber 13. By the way, when the plug 13a at the other end of the optical fiber 13 is erroneously inserted into the receiving port 33 of the single-core bidirectional and dual-core bidirectional optical transceiver 31, as shown in FIG. 13
Since “a” has a larger diameter than the inner diameter of the receiving port 33, there is a shape mismatch, and it cannot be completely inserted, so that erroneous insertion and erroneous connection are prevented.

Further, when the two-core bidirectional optical communication network 20 and the one-core bidirectional optical communication network 11 are connected by using the single-core bidirectional and dual-core bidirectional optical transceiver 31 described above. Is as shown in FIG. That is, a node 21 provided with a two-core bidirectional dedicated optical transceiver 23 provided in the two-core bidirectional optical communication network 20 and a single-core bidirectional When connecting between a node having the dual-core bidirectional optical transmitter / receiver 31 by using a dual-core optical fiber 22, a single-core bidirectional and a dual-core bidirectional provided in one node 21 to be connected to each other are used. The plug 16c of the optical fiber 22 is inserted into the transmission / reception port 32 of the receptacle 34 of the shared optical transceiver 31, and the plug 16d of the optical fiber 22 is inserted into the reception port 33. In addition, the plug 16c at the other end of the transmission optical fiber 22 of the optical fiber 22 is inserted into the transmission port 18a of the two-core bidirectional optical transceiver 23 provided at the other node 21, and the reception is performed. The plug 16d at the other end of the optical fiber 22 is inserted into the port 18b.

Here, the transmission light emitted from the light emitting element 23c of the two-core bidirectional optical transceiver 23 is transmitted to the optical fiber 22.
And transmitted through the optical fiber 22. The light emitted from the other end face of the optical fiber 22 enters the second light receiving element 38 of the single-core bidirectional and dual-core bidirectional optical transceiver 31 and outputs from the second light-receiving element 38. The signal is amplified by the optical receiving system amplifier circuit 40. As a result, optical transmission from one two-core bidirectional optical transceiver 23 to the other one-core two-core bidirectional optical transceiver 31 is performed. In addition, the optical transmission from the other one-core two-core bidirectional optical transceiver 31 to the one two-core bidirectional optical transceiver 31 is performed in the same manner. Thus, optical communication between the two-core bidirectional optical transceiver 23 and the one-core two-core bidirectional optical transceiver 31 is performed. Therefore, the single-core bidirectional optical communication network 11 and the two-core bidirectional optical communication network 20 can be connected by the two-core optical fiber 22.
When the plugs 16c and 16d of the optical fiber 22 are inserted in the opposite directions, that is, when the plugs 16c and 16d are respectively inserted into the ports 33 and 32 of the receptacle 34, the side edges of the plugs 16c and 16d are changed as shown in FIG. Due to the shape mismatch, it cannot be completely inserted, so that erroneous insertion and erroneous connection are prevented. In addition, also in the semi-cylindrical plug 16e shown in FIG. 8B, erroneous insertion and erroneous connection due to the shape mismatch as described above are prevented.

In the embodiment described above, the second port of the single-core / two-core bidirectional optical transceiver 31 is connected to the reception port 33.
And the end of the receiving optical fiber 22b of the two-core optical fiber 22 is inserted. However, the present invention is not limited to this, and it is configured as a transmitting port, and instead of the second light receiving element 38. , A second light emitting element may be provided. In this case, the second light emitting element is configured to be selectively connected to the driving unit 39a in parallel with the light emitting element 36. Thereby, the transmission optical fiber of the two-core optical fiber is inserted into the transmission port, which is the second port, and the reception optical fiber is inserted into the transmission / reception port, thereby performing bidirectional optical transmission / reception. Can be done.

As described above, according to the embodiment of the present invention, the single-core bidirectional optical communication network 11 is configured by using one type of single-core bidirectional and dual-core bidirectional optical transceiver 31. Can also be connected to the two-core two-way optical communication network 20, and it is compatible with any type of two-way optical communication network. In particular, a single-core bidirectional dedicated optical communication network 1 used in a public communication network represented by an ATM subscriber system or the like.
1 is easily connected to a two-core bidirectional optical communication network 20 used in a private communication network represented by FDDI-LAN or the like. Therefore, the nodes to be connected to the optical communication network are provided with the single-core bidirectional and dual-core bidirectional optical transceiver 3.
0, it is possible to support both the single-core bidirectional dedicated optical communication network 11 and the dual-core bidirectional dedicated optical communication network 20. The connection with the dedicated optical communication network 20 is easily performed. For this reason, it becomes easy to mix the single-core bidirectional optical communication network 11 and the double-core bidirectional optical communication network 20 in one optical communication network.

[0039]

As described above, according to the present invention, it is possible to use both a single-core bidirectional optical network and a dual-core bidirectional optical communication network. An optical transceiver can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a bidirectional optical communication network to be connected by a single-core bidirectional and dual-core bidirectional optical transceiver according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the configuration of (A) a single-core bidirectional dedicated optical transceiver and (B) a two-core bidirectional dedicated optical transceiver in the bidirectional optical communication network of FIG.

FIG. 3 is a schematic diagram showing a connection state between single-core bidirectional optical transceivers in FIG. 2A using a single-core optical fiber;

FIG. 4 is a schematic diagram showing a normal connection state of the two-core bidirectional optical transmitter / receiver of FIG. 2B using two-core optical fibers.

FIG. 5 is a schematic diagram showing an erroneous connection state between two-core bidirectional optical transceivers in FIG. 2B using two-core optical fibers.

FIG. 6 shows the two-core bidirectional optical transmitter / receiver of FIG. 2 (B) and FIG.
(A) is a schematic diagram showing a state of incorrect connection with a single-core bidirectional optical transmitter / receiver using a single-core optical fiber.

FIG. 7 is a schematic diagram illustrating a configuration of an embodiment of a single-core bidirectional and dual-core bidirectional optical transceiver according to an embodiment of the present invention.

8 (A) is a schematic sectional view and FIG. 8 (B) is a schematic perspective view showing a connection state between a single-core bidirectional and dual-core bidirectional optical transceiver shown in FIG. 7 and a two-core optical fiber.

9A is a schematic cross-sectional view and FIG. 9B is a schematic perspective view showing a connection state between a single-core bidirectional and dual-core bidirectional optical transceiver shown in FIG. 7 and a single-core optical fiber.

10A and 10B are schematic diagrams illustrating a connection state of a single-core bidirectional and dual-core bidirectional optical transceiver according to FIG. 7 using a two-core optical fiber, in which (A) is normal and (B) is reverse. is there.

11A shows a connection state of a single-core bidirectional optical transmitter / receiver according to FIG. 7 and a conventional single-core bidirectional optical transmitter / receiver using a single-core optical fiber. FIG. (B) It is the schematic in the case of an incorrect connection.

12A and 12B show a connection state of a single-core dual-core bidirectional optical transceiver shown in FIG. 7 and a conventional dual-core bidirectional optical transceiver using two-core optical fibers (A) Normal case and (B) It is a schematic diagram in the case of a reverse direction.

[Explanation of symbols]

10 bidirectional optical communication network, 11 single-core bidirectional dedicated optical communication network, 12, 21 node, 13 single optical fiber, 13a plug, 14 A single-core bidirectional dedicated optical transceiver, 20: a two-core bidirectional dedicated optical communication network, 22: a two-core optical fiber, 16c, 16d, 1
6e: plug, 23: two-core bidirectional dedicated optical transceiver, 30: device, 31: single-core bidirectional and dual-core bidirectional optical transceiver, 32: transmission / reception port ( 1st port), 33 ... receiving port (2nd port), 3
4 ... receptacle, 35 ... transmission / reception light separation element,
36 ... light emitting element, 37 ... light receiving element, 38 ...
2nd light receiving element, 39... Optical transmission system drive circuit, 40.
..Optical receiving system amplifier circuits.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 10/13 10/12

Claims (6)

[Claims] A first port into which a connection end of an optical fiber of a single-core bidirectional optical communication network or a transmission connection end of an optical fiber of a two-core bidirectional optical communication network is inserted; A second port into which the receiving connection end of the optical fiber of the optical fiber communication network is inserted, and light emission provided in the first port corresponding to the connection end of the inserted optical fiber. An optical element, a first light receiving element, and a second light receiving element disposed in the second port so as to correspond to a connection end of the inserted optical fiber. A two-core bidirectional and two-core bidirectional optical transceiver. 2. A configuration in which the shape of the first port and the shape of the second port are different from each other in accordance with the shape of the connection end of the optical fiber of the two-core bidirectional optical communication network. The single-core bidirectional and dual-core bidirectional optical transmission / reception device according to claim 1, wherein: 3. The single core according to claim 1, wherein the second port has a shape into which a connection end of an optical fiber of the single core bidirectional optical communication network cannot be inserted. Bidirectional and dual-core bidirectional optical transceiver. 4. A first port into which a connection end of an optical fiber of a single-core bidirectional optical communication network or a reception connection end of an optical fiber of a two-core bidirectional optical communication network is inserted; A second port into which the transmission connection end of the optical fiber of the bidirectional communication network is inserted, and a first port provided in the first port corresponding to the connection end of the inserted optical fiber. A light emitting element and a light receiving element, and a second light emitting element disposed in the second port so as to correspond to the connection end of the inserted optical fiber. , Single-core bidirectional and dual-core bidirectional optical transceiver. 5. The shape of the first port and the shape of the second port are different from each other in accordance with the shape of the connection end of the optical fiber of the two-core bidirectional optical communication network. The single-core bidirectional and dual-core bidirectional optical transmission / reception device according to claim 4, characterized in that: 6. The single core according to claim 4, wherein the second port has a shape in which a connection end of an optical fiber of the single core bidirectional optical communication network cannot be inserted. Bidirectional and dual-core bidirectional optical transceiver.