JPH01123537A - Optical loop type line constituting system - Google Patents

Abstract

PURPOSE:To freely execute the complete bidirectional communication between a master station and a slave station by using first and second light signals having a difference wavelength and executing the bidirectional transmission with a loop-shaped light transmission line. CONSTITUTION:The common edge of first and second optically coupled demultiplexers (WDM) 11 and 12 is connected to a connecting edge A connected to one side light transmission line and a connecting edge B connected to other side light transmission line and first and second light signals lambda1 and lambda2 given from connecting edges A and B have a mutually different wavelength. Consequently, the bidirectional transmission by the first and second light signals lambda1 and lambda2 is respectively and individually multiplexed by loop-shaped light transmission lines 101-104. Thus, the bidirectional communication between a master station 1 and respective slave stations 2-4 and mutual respective slave stations 2-4 can be freely executed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention connects a master station and a plurality of slave stations in a loop through an optical transmission line, and connects the sending end and receiving end of the optical transmission line to the master station. This relates to a line configuration method terminated by .

[Conventional technology]

FIG. 3 is a block diagram showing a conventional example, in which a master station 1 and a plurality of slave stations 2 to 4 are connected in a loop through optical transmission lines 101 to 104, with the sending end 105 and receiving end 10B of the It is terminated at station 1, and connected to telephone 5 after performing 4-wire to 2-wire conversion, and at each slave station 2 to 4,
In addition to relaying between each optical transmission line 101 to 104, the master station 1
receives a signal from the side and sends it to the telephones 6 to 8, and
Signals from telephones 5 to 8 are sent to optical transmission line 102=-104.

In addition, the master station 1 and each of the slave stations 2 to 4 are each equipped with a photoelectric conversion board and an electro-optical conversion board that mutually convert the optical signals of the optical transmission lines 101 to 104 and the electrical signals of the telephones 5 to 8. At the same time, each slave station 2 to 4 also has an optical transmission line 1.
4 wires 2 for connection between 01~104@ and telephones 6~8
Equipped with line conversion function.

However, in the case of the configuration shown in FIG. 3, the optical signal is terminated by the master station 1, and bidirectional communication between the master station 1 and each of the slave stations 2 to 4 can be performed; The drawback is that two-way communication between the four is impossible.

As a countermeasure against this problem, a system shown in the block diagram of FIG. 4 phones 6-1! configure a 1=1 line between the
The telephones 5 to 8 are connected to each other via exchange.

[Problem that the invention seeks to solve]

However, in the configuration shown in Fig. 4, there is one:
1 line must be set up, which causes problems in that the usage efficiency of the optical transmission line is reduced and the configuration of the conference trunk 9 becomes complicated, making it expensive and uneconomical.

[Ninth way to solve the problem]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

That is, in the line configuration system shown in FIG. a first photoelectric converter board that converts a first optical signal passed through the device into an electrical signal; and a first electro-optical converter board that converts the electrical signal into a second optical signal and supplies it to the first optical coupler/demultiplexer. and the second
a second photoelectric conversion board that converts the second optical signal passed through the optical coupling demultiplexer into an electrical signal; A second optical converter board is provided for each station, and the first optical signal is used to perform communication between the master station and each slave station, and the communication between each slave station in a specific direction, and the second optical signal is used to communicate between the master station and each slave station. Communication between slave stations is performed in a specific direction and in the opposite direction.

[Effect]

Therefore, the loop-shaped optical transmission line allows two-way transmission of the first and second optical signals by individually multiplexing them. Direct communication becomes possible.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 and 2 showing embodiments.

FIG. 1 is a block diagram of the main parts of each station 1 to 4, and a connecting end A1 connected to one optical transmission line and a connecting end B connected to the other optical transmission line have first and second terminals. 2 optical coupler/demultiplexer (hereinafter referred to as WDM) 11.

12 common ends are connected, and the first and second optical signals λl given from the connecting ends A and B.

The λ weights have different wavelengths.

At /114 into an electrical signal, the multiplexing/demultiplexing unit (hereinafter referred to as MUX/DMU)
X) 15, while the MUX/DMUX
The electrical signal to be sent to connection end A from 15 is converted into an optical signal λ2 by the first electro-optic converter board (hereinafter referred to as 110) 1.6, and then given to WDMll, and sent to the same connection end B. The power electric signal is converted into an optical signal λ multiple by the second E1017 and then given to the WDM 12, and each of these optical signals λ2 and λ
2t- to connection ends A and B respectively.

FIG. 2 is a block diagram of the entire configuration of each station 1 to 4, which includes the main parts shown in FIG. λ2 is transmitted individually in the counterclockwise direction in the figure, which is the opposite direction to the specific direction, and the connecting end At in Fig. 1 is the receiving side of the optical signal λ1, and the similar connecting end B is connected to the receiving side of the optical signal λ1. In addition to connecting to the receiving side, each slave station 2 to 4 also connects to the MUX/
Each addition function 21 to 23t is realized by DMUX15,
While connecting with telephones 6 to 8, master station 1
The X/DMUX 15 performs termination with matching loads 24 and 25 and connection with the telephone 5.

Therefore, the transmitting signals from the telephones 5 to B are transmitted counterclockwise by the optical signal λ, and finally become the receiving signals of the telephone 5, as well as being sent to the telephone 6 via the adder functions 21 and 22.
8, two-way communication is carried out between telephone 5 of master station 1 and telephones 6 to 8 of each slave station 2 to 4, and telephones 6 to 8 of each slave station 2 to 4 are received. A counterclockwise call is made between.

In addition, the transmission signals from the telephones 6 to B of each slave station 2 to 4 are as follows.
The optical signal λ1 is transmitted clockwise via the addition function 23, and becomes a reception signal by the addition function 22, so that a clockwise call is performed between the telephones 6 to 8 of each slave station 2 to 4, and the optical signal λ1 By using this in combination with the counterclockwise call, two-way calls can also be made between the telephones 6 to 8.

That is, the optical transmission lines 101 to 104'f! - Optical signals λ1 of mutually different wavelengths. Since it is used as a multiplex transmission line based on λ and thereby performs two-way transmission, it is possible to configure a complete two-way communication line between the master station and each slave station without the need for a conference trunk or the like. Can be done.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, two-way transmission is performed through a loop-shaped optical transmission line using first and second optical signals having different wavelengths, so that the master station and each slave station can communicate with each other. Complete two-way communication between optical transmission lines is possible, which improves the efficiency of transmission line usage and realizes an economical line configuration, which has remarkable effects in various types of communication using loop-shaped optical transmission lines. .

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 is a block diagram of the main part, FIG. 2 is a block diagram of the entire configuration, and FIG. 3 is a block diagram of the main part.
4 and 4 are block diagrams of the conventional example. 1・m-・master station, 2~4...e slave station, 5~8...
Telephone, 11.12...1 Optical coupling/demultiplexer, 13.14
...Photoelectric conversion board, 16,170...Electronic conversion board,
101~104@... optical transmission line, λ! , λ2...
optical signal.

Claims (1)

[Claims] In a line configuration system in which a master station and a plurality of slave stations are connected in a loop through an optical transmission line, and the sending and receiving ends of the optical transmission line are terminated by the master station, first and second stations having different wavelengths are connected to each other in a loop. a first and a second optical signal for combining and separating two optical signals;
an optical coupling demultiplexer; a first photoelectric conversion board that converts the first optical signal via the first optical coupling demultiplexer into an electrical signal; and a first photoelectric conversion board that converts the electrical signal into the second optical signal. a first electro-optical converter board that supplies the optical signal to the first optical coupler and demultiplexer;
and a second electro-optical converter board that converts the electrical signal into the first optical signal and supplies it to the second optical coupling/demultiplexer, and a second electro-optical converter board that converts the electrical signal into the first optical signal and supplies it to the second optical coupling/demultiplexer, carrying out communication between the master station and each slave station, carrying out communication in a specific direction between the respective slave stations, and carrying out communication in the opposite direction to the specific direction between the slave stations using the second optical signal; Features an optical loop line configuration method.