JPH0246029A - Optical communication method - 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 single-wire bidirectional optical communication system.

[Conventional technology]

FIG. 3 1, for example, "
1 is a configuration diagram showing an optical transmission system using a branch communication device of a conventional optical communication device shown in "Optical Switch". below,
``A communication node station or communication device station is also simply called a station.

In FIG. 3, reference numeral 1 denotes an optical switch that switches the optical path, which is the direction in which the optical signal travels, and when a station fails, the optical path section is switched so that the optical signal can pass through the station. 3 and 4 are an upstream optical input end and a downstream optical input end of the optical switch 1, and 5 and 6 are a downstream optical output end and an upstream optical output end of the optical switch 1.

Further, in FIG. 3, 7 to 10 are communication devices (stations), and 7 is a B station, 8 is a 0 station, 9 is a D station, and 10 is an A station. 11 is an optical fiber that transmits optical signals.

Next, the operation will be explained.

Light entering the upstream light input end 3 of the optical switch 1 passes through a built-in transmission prism (not shown) and exits from the bottom or the light output end 5. This light passes through, for example, the 8th station 7 in FIG. 3, which is optically transmitted to the optical switch l. In this way, the A station 10
The optical signal from 0 passes through the optical fiber 11 and is transmitted to the 0 station 9 through each station in sequence. When normal, there are 8 stations and 7.
At each station (station 08, station 9), the optical signal is amplified to compensate for attenuation due to light absorption, confusion, etc. in the optical path. If a failure occurs in one of these stations, use a drive device to move the transmission prism in the optical switch 1 for that station, and close the upstream optical input terminal of the optical switch 1. The light that entered 3 went directly up and was output from the light output end 6. At the failed station, the light was transmitted to the next normal station without being branched or amplified.

In this way, in the conventional device, A station 10 → B station 7 - C station 8
→ D station 9 → A station 10, forming a loop in which optical signals were transmitted in one direction.

[Problem to be solved by the invention]

In the conventional optical communication device as described above, when connecting multiple stations to form one optical transmission system, if one of the stations fails, the optical switch 1 allows the station to pass through (pass-through). This was used to transmit optical signals to the phosphorus layer.

However, when building a tree-like system, if a branched station breaks down, it will be impossible to transmit information to the additionally connected communication system, and a part of the system will become inoperable. It is desired to obtain an optical communication system in which even if a station fails, the entire optical communication system other than the failed station can transmit information.

Therefore, this invention was made in view of this point, and even if one of the stations breaks down, it is possible to pass through the station and transmit an optical signal to the phosphor layer.
The purpose of this invention is to obtain an optical communication method that allows information to be transmitted by the entire optical communication system except for a failed station even in the case of a tree-like system configuration.

[Means to solve the problem]

Optical fiber for optical communication 11 and y! It has a number of connections, and it is capable of extracting information received from any of them, amplifying and transmitting light to all connections, and transmitting (pass-through) the optical signal coming from one to the other. A first communication system An optical fiber that connects an optical connection part other than the light-transmissible connection part of two arbitrary communication nodes of the communication system Y with a connection part other than the light-transmission connection part of one arbitrary communication node of the communication system Y. It is equipped with the following.

[For production]

In the optical communication system of the present invention, information from any communication node station of two communication systems In addition to extracting information as
The information is optically amplified and transmitted and transmitted (pass-through) to all communication nodes connected in series through optical fibers. Then, the communication node station connecting the two communication systems X and Y transmits the optical signal, which has been optically amplified and transmitted, to another communication system through the optical fiber for additional connection. Therefore, even if one of the communication nodes in the communication system fails, an optical signal can be transmitted to the phosphor layer, and communication throughout the system becomes possible.

〔Example〕

FIG. 1 is a circuit diagram showing a communication control system for an air conditioner, which is an embodiment of the present invention. In the figure, a plurality of communication nodes 22 correspond to stations A to E, respectively, and these communication nodes 22 correspond to stations B and A.

A communication system xI! is created by continuously connecting the light transmitting (pass-through) connecting parts of stations C, D, and E in this order with one optical fiber 11. It consists of

In addition, the communication system Y branched from the communication system is
If there is a plurality of communication nodes 22 corresponding to F and G stations, and the light-transmissible connecting portion of this communication node 22 is continuously connected by one optical fiber 11, any arbitrary communication node of the communication system Bureau.

That is, the other connection section 22b of the communication node 22 of the A station and one connection section 22a of the F horse communication node 22 of the communication system Y.
The other connection part 22b of the C-horse communication node 22 of the communication system X and the other connection part 22b of the lower question communication node 22 of the communication system Y are connected by an optical fiber 12b. This constitutes a tree-structured communication system.

Further, in FIG. 1, 30 are A, B, C, and E.

an air conditioning indoor unit connected to each communication node 22 of F and G stations;
31 is a remote control (hereinafter referred to as remote control) connected to the communication node 22 of station D, for example, for adjusting the temperature of an air conditioner. 32 is a commercial power source that is a power source for driving each air conditioning indoor unit 30, and 33 is an air conditioning outdoor unit that operates in pair with each air conditioning indoor unit 30. 34 is a microcomputer built into the remote controller 31, and 35 is a microcomputer built into the air conditioning indoor unit 30.

In this air conditioner communication control system, air conditioner indoor units 30 connected to communication nodes 22 of stations A, B, C, and E are divided into four units in a large room, for example, and one remote controller 31 is installed.
In system X, which controls operation according to temperature etc., station F,
A system Y consisting of an air conditioning indoor unit 30 connected to the communication node 22 of the G station is additionally connected, and the operation is controlled by one remote control 31. The control signal from the remote control 31 is converted into an optical signal at the D station, and the control signal is sent to both the left and right A, B, and C stations.

It is transmitted to station E and additionally connected stations F and G.

The operation of the control system configured as described above will be explained below.

First, a temperature signal set with the remote controller 31 is outputted from the microcomputer 34 to the transmission signal output terminal TD as a temperature signal. This electrical signal is photoelectrically converted by a light emitting element within the communication node 22. The optical signal is then optically transmitted through the optical fiber 11 to stations 0 and E, which are located on both the left and right sides of station D.

In response to this optical signal, a part of the optical signal passes through the communication node 22 of station 0 and is transmitted as it is to station A located next to it. In addition, a portion is transmitted to the light receiving element. The light is then converted into an electrical signal by this light receiving element, further amplified by an amplifier circuit, and input to the received signal input terminal rLD. This input signal is received by the microcomputer 35 in the air conditioner room [30]. The microcomputer 35 generates a signal having a predetermined communication speed and a predetermined constant pulse width in synchronization with this received signal. Then, the transmission signal is output to the transmission signal output terminal TD of each communication node 22.

After that, the transmitted signal is photoelectrically converted, and the optical signal is passed through the optical fiber 11 to stations A and D, which are located on both the left and right sides of station 0.
The signal is optically transmitted to the station, and is also optically transmitted to the F station through the optical fiber 12b for additional connection.

Therefore, the temperature setting signal from the remote controller 31 is transmitted to the A station as well as to the 0 station. Moreover, it is energized and transmitted at station 0. Therefore, even if several stations are connected to the left of station A, the same communication information can be sequentially transmitted in the same way. The same applies to the right-hand side of the remote control station D. Moreover, since each of these stations is capable of light transmission (pass-through), for example, 0 stations may fail or commercial Tri K
t ”°2 is not included (but the communication signal from station D is transmitted to the neighboring station. On the other hand, station F, which was optically transmitted from station 0 through the optical fiber 12b for additional connection, is also connected to station G and below in the same manner as above. The same communication information can be sequentially transmitted to the right neighbor.

Here, for transmission from station 0 to station F, the signal is transmitted from the additional connection part, but since it is not possible to pass through the signal from station D (or station A), station 0 has failed. If light transmission becomes impossible due to such reasons, information will no longer be transmitted to the F station. For this reason, by bypass-connecting stations 9 other than station 0, for example, station A and station F, communication information can be transmitted to station F through station A even if station 0 suffers a failure or the like.

This means that since the communication node station is capable of optical transmission (bus through), it is possible to communicate with two consecutive stations as long as no failure occurs. Communication information can be transmitted to station F except in cases where both stations other than the station, for example, station A, cannot transmit light at the same time due to a failure or the like.

When the optical communication system of this embodiment is used as described above, 1.
Even in the case of some communication systems, even if a station is unable to transmit light due to a failure of a certain station, the entire tree-like communication system other than the failed station will be can be controlled.

In each of the embodiments described above, the case where the optical communication system is used in an air conditioner control system has been described as an example of the use of the optical communication system, but the system is not limited to this system. For example, due to the characteristics of optical communication, which is not affected by electromagnetic noise, it is widely used in information equipment such as personal computers, factory communication systems such as NC machines, and home automation communication systems. It can be used in industry.

FIG. 2 shows an embodiment of a control system for an information device such as a personal computer. In this control system, a building S and a building T, each of which has a built-in network of information devices such as personal computers, are connected by optical communication to form one system. In each pill S and building T, there is a communication node 2 of this embodiment.
An information device 40 such as a personal computer is connected to 2, forming an existing communication system. By connecting the above two systems to the additional connection section mentioned above, there is no need to connect from the ends of Building S and Building T.
Building S and building T can be configured as one communication system by connecting any communication node 22 that is the shortest distance and easiest to connect between building S and building T. For example, when connecting a communication system in a 5-shaped pill S and a communication system in a building T adjacent to the 5-shaped bend in the building S, any communication node 22 in the pill T and the communication system in the building S Building S and Building A communication system that integrates building S and building T using an optical light guide path that can pass through and bypassed additional connecting optical fiber 12b even when the communication node station that directly connects building T is unable to transmit information due to a failure or the like. The system is capable of communicating information except for the failed station.

Furthermore, if the optical communication system according to this embodiment is used, even if optical connections are made in a tree-shaped multi-drop bus system indefinitely, unless two consecutive stations fail at the same time, the communication system will be able to operate without the failed station. Information communication is possible.

〔Effect of the invention〕

As described above, when this optical communication method is used, in the multi-drop bus format, a part of the optical signal is transmitted as is through light transmission (pass-through) to the phosphor layer, etc., and also in the tree-like communication format, additional connections are made. By bypassing the optical fiber, even if the station in question fails, optical signals can be transmitted to the phosphor layer, improving the reliability of the communication system.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a control system for an air conditioner which is an embodiment of the present invention, FIG. 2 is a circuit diagram showing a control system for information equipment such as a personal computer, which is a further application example of the invention, and FIG. The figure is a configuration diagram showing a conventional optical transmission system. 11 optical fibers 12a, 12b - optical fibers that can be additionally connected, 22 communication nodes, 30 indoor units for air conditioning. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent: Ohatsu Magnetism (2 others) Procedural amendment (voluntary) Figure 3 1, Case indication Patent Application No. 1987-197549 2, Name of the invention Optical communication system 3, Person making the amendment Representative I. 1 Kimoriya5. Drawing subject to correction 6? Vll positive contents drawing Figure 1 has been corrected as shown in the attached sheet. 7. 1 attached document amended drawing

Claims (1)

[Claims] It has an optical fiber for optical communication and a plurality of connecting parts, and the information received from any of the connecting parts is extracted, optically amplified and transmitted to all the connecting parts, and two of the plurality of connecting parts are A first optical communication system path has a plurality of communication node stations capable of transmitting (pass-through) an optical signal coming from one to the other, and connecting two connecting parts of each communication node capable of transmitting light in series with an optical fiber. , a second optical communication system path connected by branching an optical signal from an optical connection section other than the two light-transmissible connections of an arbitrary communication node of the first optical communication system path; an optical connection part other than the two light-transmissible connections of any communication node in the optical communication system path; and an optical connection part other than the two light-transmissible connections of the arbitrary communication node in the second optical communication system path. and an optical fiber connecting the first
, an optical communication system in which even if one of the communication nodes in the second optical communication system path fails, optical pass-through is performed to enable optical communication between the entire first and second optical communication systems other than the failed station.