JPH03230625A - Optical submarine repeater - Google Patents

Abstract

PURPOSE:To attain high reliability and low power consumption by providing a switch circuit of logic circuit configuration whose logical operation is controlled with an external control signal so as to attain optional changeover connection of input and output in a system of an optical submarine repeater to the post-stage of an electric circuit converting an optical transmission signal into an electric signal and shaping the waveform of the signal. CONSTITUTION:Each optical submarine repeater 50 is provided with a switch circuit 55 at the post stage of a regenerator electric circuit 54 converting an optical transmission signal into an electric signal and shaping the waveform of the signal. Then optional connection between a main signal and an optical fiber cable 52 for 3 circuits of the optical submarine repeaters 50 is attained, and the communication is ensured by the connection avoiding a fault point in a switching section L. Thus, the optical submarine repeater 50 is realized, in which communication is ensured even in the case of a duplicate fault in a transmission line between the optical submarine repeaters 50 and signal line changeover with low power consumption is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical submarine repeater, and more particularly to an optical submarine repeater including a backup line for increasing the reliability of the line.

[Conventional technology]

Conventionally, in optical submarine repeating equipment that includes this type of backup line, if a failure occurs in the optical or electrical circuit or cable at one point on the transmission line, the system circuit that caused the failure can be avoided between both end stations. The method was to switch to a backup line. Furthermore, when a picture relay device had a switching circuit, the switch was realized by combining an electromagnetic relay.

[Problem to be solved by the invention]

Switching between terminal stations in the conventional optical submarine repeater described above is as follows:
If a failure occurs for the first time, it is possible to switch to a backup line and recover, but the drawback is that if a failure occurs again, the system will immediately go down.

Furthermore, switch circuits using electromagnetic relays are unsuitable for submarine relay equipment, which requires high reliability, because they have a high failure rate compared to other components, and for this reason, domestic manufacturers have not adopted them.

In addition, relays have a disadvantage in that they consume large amounts of power, and are not preferred in relay devices that require power-saving design.

[Means to solve the problem]

The device of the present invention is an optical submarine repeater having at least two systems including a protection line, in which an optical transmission signal is converted into an electrical signal and the logical operation of the electrical circuit after waveform shaping is controlled by an external control signal. , is configured by disposing a switch circuit having a logic circuit configuration that enables arbitrary switching connection of input/output between the systems of the optical submarine repeater.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a circuit diagram of an embodiment of a switch circuit in an optical submarine repeater according to the present invention, and FIG. 2 is an explanatory diagram showing an example of a system switching state according to the embodiment of FIG. The embodiment shown in FIG. 1 shows an example of system switching in the case of 3 systems and 3 channels including a protection line, and when driving a switch circuit for system switching, PV modulation is applied to the main signal from the monitoring and control device of the terminal station. A control command is transmitted by applying , and an L signal "'O" is applied to any of the control signal input terminals 30 to 32 through a decoder circuit, and an H signal "1" is applied to the other terminals.

In FIG. 1, "0" is applied to the control signal input terminal 30, and "1" is applied to the other terminals. Two-man power NOR circuits 41a to 41a are connected to the control signal input terminals 31 and 32 to which "1" is applied. 41C242a to 42C, regardless of whether the main signal S input to other input terminals is high, the output is "'"
In addition, the main signal S input to the other input terminals of the two-man power NOR circuits 40a to 40c connected to the control input terminal 30 is passed through as is, and the output becomes S.Furthermore, the main signal S is three-man power It is input as the power of one person to the NOR circuit 43, but the power of the other two people is always "0'°, so the main signal output terminal 2
0, the main signal S is output.

FIG. 2 is an explanatory diagram of system switching in the embodiment of FIG. 1. When "0" is applied to the control input terminal 30 in FIG. 1, the main signal input terminals 1.0 to 12 are connected to the main signal output terminals 20 to 22, respectively, and the control signal input terminal 31 is connected to the main signal input terminals 1.0 to 12, respectively, as shown by the solid line. When “o” is given, the connection shown by the dotted line,
Furthermore, when 0'° is applied to the control signal input terminal 32, the connection shown by the dashed line is realized, and through such logical operation, any connection between systems can be made with high reliability and low power consumption. It becomes possible.

FIG. 3 is a configuration diagram showing an example of the configuration of the optical submarine repeater according to the embodiment of FIG. 1 and a switching unit section.

Each optical submarine repeater 50 converts an optical transmission signal into an electrical signal, shapes the waveform, and connects a first
Equipped with a switch circuit 55 having the configuration shown in the figure, it is possible to arbitrarily connect the three circuit optical fiber cables and the main signal,
Communication is ensured through connections that avoid failure points during each switching section.

FIG. 4 is an explanatory diagram showing an example of system switching when a failure occurs in the optical submarine repeater of FIG. 3.

FIG. 4 shows an example in which the lines of systems 1 and 2 are secured while avoiding the failure point W, and only the standby system is placed in a standby state until the line is restored.

In the embodiment shown in FIG. 1, it is easily possible to have four or more circuit configurations depending on the number of systems, and the circuit configuration can be simplified and all combinations can be switched arbitrarily. In addition, the isolation between the systems is achieved through a two-stage configuration: a two-man powered NOR circuit to turn on/off the main signal, and a three-man powered NOR circuit (the number of inputs corresponds to the number of systems) to combine the main signals. , sufficient crosstalk characteristics can be obtained. Furthermore, since the switch circuit is placed at a location where the waveform-shaped signal is stable, operation is stable, there is no insertion loss, and switching is performed using a logic circuit, ensuring a highly reliable configuration.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of main signal inputs from a plurality of systems input to the optical repeater by a combination of logic gates are input to the electrical circuit system after waveform shaping of the optical transmission signal in the optical repeater. By installing a switch circuit that can be arbitrarily connected to the optical fiber output line of the optical fiber output line, highly reliable and low power consumption signal line switching that can ensure communication even in the case of duplicate failures in the transmission line between optical repeaters. This has the effect of realizing a possible optical submarine repeater.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of a switch circuit for switching between systems in the optical submarine repeater of the present invention, FIG. 2 is an explanatory diagram of system switching by the switch circuit of the embodiment of FIG. 1, and FIG. 1 is a block diagram showing the connection configuration and switching unit section of an optical submarine repeater equipped with the switch circuit of the embodiment shown in FIG. 1, and FIG. 4 is an example of system switching when a failure occurs in the optical submarine repeater shown in FIG. 3. FIG. 10 11.12...Main signal input terminal, 20°21.
22... Main signal output terminal, 30, 31.32... Control signal input terminal, 40a-40c, 41a-41c,
42a ~ 42c = 2-man power NOR circuit, 43a ~ 43
cm3 human powered NOR circuit, 50...relay device, 51...
Regenerator, 52... Optical fiber cable, 53...
・・Optical input circuit, 54 ・・Regenerator electric circuit,
55... Switch circuit, 56... Optical output circuit.

Claims (1)

[Claims] In an optical submarine repeater having at least two systems including a backup line, the logical operation of the electrical circuit after converting the optical transmission signal into an electrical signal and shaping the waveform is controlled by an external control signal, and the optical submarine repeater An optical submarine relay circuit comprising a switch circuit having a logical circuit configuration that enables arbitrary switching connection of input and output between systems.