JPS63177628A - Optical star network system - Google Patents

Abstract

PURPOSE:To obtain an optical star network having high reliability, without suspending an operation of each network, by providing an electro-optical transducer and an photo-electric transducer connected to each input and output port, respectively of the optical start network, and a selecting means for selecting an input and an output of the transducer group. CONSTITUTION:An optical repeater 100 of an optical star network is connected to input and output ports of each start coupler 10, 20 and 30 of plural networks A-C. To photo-electric transducers 101-103 of this repeater 100, optical fibers 1-3 from each coupler 10, 20 and 30 are connected, and to an electrooptical transducers 111-113, optical fibers 4-6 of each coupler 10, 20 and 30 are connected. Also, between the transducers 101-103 and 111-113, a signal selecting and switching part 120 is placed. In such a way, without suspending an operation of each network A-C, a system having high reliability is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to optical star network systems.

Conventional technology Figure 3 shows a conventional optical star network.

In FIG. 3, the optical transmitters and optical receivers of stations D to D are respectively connected to the input and output ports of the optical star coupler via optical fibers.

In this way, when attempting to integrate two or more optical star networks, the number of stations is limited to the number of ports of the optical star coupler. Therefore, when attempting to configure a network with stations that have more ports than the number of ports on the optical star coupler at the time of initial installation, it is necessary to replace the optical star coupler at the time of initial installation with a new optical star coupler on the number of stations. . This also causes an increase in the level difference between the optical transceivers of each station. Due to this increase in level difference, the optical level of the optical signal sent from the optical transmitter of each station and input to the optical receiver of each station via the optical star coupler becomes lower than the minimum light reception level of the optical receiver. will occur, and communication between stations will not be possible. For this reason, it was sometimes necessary to integrate networks using an active optical star coupler as shown in FIG.

In FIG. 4, the optical signals output from the optical transmitters of the stations 1 to 0 are respectively inputted via the optical fiber group 17 to the n port side of the star coupler 60 with the number of ports n:1. This optical star coupler 6 with the number of ports n:1
The optical signal input to o is optically transmitted via the optical fiber 19.
The signal is input to an electrical converter 104 (hereinafter referred to as 0/E) and converted into an electrical signal. This electrical signal is input to the electrical/optical converter 114 (hereinafter referred to as E10), converted to an optical signal again, and inputted via the optical fiber 25 to the 1 port side of the optical star coupler 61 with the number of ports of 1:n. Ru.

The optical signal inputted to the optical star coupler 61 with the number of ports 1:n is inputted to the optical receiver of each station person 1 to station person n via the optical fiber group 18.

Problems to be Solved by the Invention When integrating multiple optical star networks as shown in Figure 3, conventionally, each time the networks are integrated, the number of ports in the star network is greater than the number of all stations in the network to be integrated. A coupler was required, and the operation of each network had to be temporarily suspended when converting to an optical star coupler.

Additionally, as the number of optical star coupler ports increases, the level difference between the transmitter and receiver of each station increases, making it impossible to communicate between stations. It happened that I had to use . A problem with this active optical star coupler 600 was that it affected all the stations.

The present invention has been made in view of this point, and provides a highly reliable optical star network system without interrupting the operation of each network when a plurality of optical star networks are integrated.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides, for each network of a plurality of optical star networks using optical star couplers, one input port and one output port of each optical star coupler. A plurality of connected electrical/optical converters, a plurality of optical/electrical converters, and a signal that is early in time in the output of the optical/electrical converter group are selected, and the signal is sent to the optical/electrical converter that received the signal. It has an optical repeater comprising a signal selection switching section for inputting to the electrical/optical converter group connected to a network other than the connected network, and is configured to integrate a plurality of optical star networks. There is.

Operation The present invention uses the above-described configuration to perform optical-to-electrical conversion of optical signals input to the optical repeater from each network, and input the converted signals to the signal selection switching section. This signal selection switching section selects a signal input earlier in time. In addition, multiple electrical/electrical converters connected to networks other than the one connected to the optical/electrical converter to which this selected signal is input
By outputting to an optical converter and integrating multiple optical star networks, a highly reliable optical star network system can be constructed without interrupting the operation of each network.

Embodiment FIG. 1 is a block diagram showing an optical star network system according to an embodiment of the present invention, and will be explained by taking as an example the case where three networks are integrated. In Figure 1,
The optical repeater 100 consists of three networks, Eloll, 112, 113.0 connected to the input and output ports of star couplers 10°20.30, B and C, respectively.
/E101. 102, connected to IQ3 and O/IC101°102.103, 0/E1o1°102.1
A signal selection switching unit 120 selects a temporally earlier signal in the output of 03 and inputs it to the network 10 connected to a network other than the network connected to the O/E that received this signal. .

A case of communication from network B to network B (j) will be explained. An optical signal output from a certain station in network A is input to the input port of star coupler 1o via optical fiber group 12. This optical signal teeth,
The signal is input to the network station group via the optical fiber group 11, and is also input to the O/K 1o1 of the optical repeater 1oo via the optical fiber 1. O/IE
The optical signal input to 101 is converted into an electrical signal and input to signal selection switching section 120 .

If the stations of networks B and C are not currently transmitting, the electrical signal input to the signal selection switching unit 120 will be transmitted to networks B and C other than the network connected to 071101 that received this signal. C
It is input to E10112.113 which is connected to E10112.113.

The electrical signals input to these E10112.113 are
The signals are converted into optical signals and input to the input ports of optical star couplers 20 and 30 of networks B and C, respectively, via optical fibers 6.6. In this way, the signal input from the network to the optical repeater 100 is prevented from going around to the network again. here,
The optical signals input to the optical star coupler 20°3o are connected to the network B, via the optical fiber groups 21 and 31, respectively.
It is input to the station group C, and is also input to the O/IC 1 of the optical repeater 100 via the optical fiber 2.3.
02,103. These O/E102.10
The optical signal input to 3 is converted into an electrical signal and input to the signal selection switching section 120.

However, since the electrical signal of the O/IC 101 is input to the signal selection switching unit 120 with a time delay, the signal selection switching unit 120 does not select these two electrical signals.

Thus, three light star networks.

When integrating B and C, there is no need to interrupt the operation of each network B and C by using the optical repeater 1oO. Furthermore, a failure in the optical repeater 10o affects only between the networks and does not spread within each network.

Although the present embodiment describes the case where three networks are integrated, the same effect can be obtained even when two or four or more networks are integrated.

In addition, since the distances between each network are far apart, it is difficult to integrate the networks by collecting optical fibers at two locations from the input/output ports of the optical star couplers of each network, and physically and between each network and the optical repeater. If the optical level difference between the two is too large and communication is difficult, the network can be integrated by using a plurality of optical repeaters as shown in FIG. By making such connections, networks can be easily added and integrated, and optical fibers can be saved.

Effects of the Invention As described above, according to the present invention, when a plurality of optical star networks are integrated, a highly reliable optical star network system can be constructed without interrupting the operation of each network.

Furthermore, networks can be integrated rationally and economically with great flexibility.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams showing the configuration of an optical star network system in an embodiment of the present invention, and FIG.
FIG. 4 is a block diagram showing an example of a conventional optical star network system. 1-8, 19.26...Optical fiber, 10゜2
0.30, 40.50... Optical star coupler, 1
1-18.21-25.31-34, 43. 44.63.54... Optical fiber group, 100°2oO... Optical repeater, 101~IQ4...
...Photoelectric converter, 111-114...Electro-optical converter, 120...Signal selection switching unit, 600
...Actig light star coupler. Name of agent: Patent attorney Toshio Nakao and one other person lo
-・-Hikari Star One side plastic 1! /6--・Optical fiber 1 potato 3rd figure 17, No.8---Optical fiber no. tq, 25--・-Optical fiber to4-m-Hikari 1J Mugirin l14・-Electric optical change day squad No. Figure 4

Claims (1)

[Claims] For each network of a plurality of optical star networks using optical star couplers, a plurality of electrical
A network other than an optical converter, a plurality of optical/electrical converters, and a network that selects a temporally early signal in the output of the optical/electrical converter group and is connected to the optical/electrical converter that receives the signal. An optical star network system comprising an optical repeater comprising a signal selection switching section for inputting to the electrical/optical converter group connected to the network.