JP2002051009A5

JP2002051009A5 -

Info

Publication number: JP2002051009A5
Application number: JP2001041121A
Authority: JP
Filing date: 2001-02-19
Publication date: 2005-06-23

Claims

A first photodetector for monitoring an optical signal transmitted through the first optical transmission line;
A second photodetector for monitoring an optical signal transmitted through the second optical transmission line;
An optical switch that selects and outputs one of the optical signals of the first transmission path or the second optical transmission path;
A performance monitor for monitoring the performance of the signal received via the optical switch;
An optical 1 + 1 switching device comprising: a controller for switching the optical switch based on information from the first and second photodetectors and the performance monitor .

In the optical 1 + 1 switching device according to claim 1, when the first optical transmission line is used as an operating system and the second optical transmission line is used as a non-operating system,
The controller sends a switching request to the optical switch;
The optical switch is switched from the second optical transmission line to the first optical transmission line according to the switching request,
The performance monitor transmits a performance monitoring result for the first optical transmission line to the controller.
When the controller receives a performance monitoring result from the performance monitor, it sends a switching request to the optical switch,
The optical switch switches from the first optical transmission line to the second optical transmission line according to the switching request, thereby monitoring the non-operating system for a predetermined time during use of the operating system. Switching device.

In the optical 1 + 1 switching device according to claim 2, when a failure occurs in the first optical transmission line which is an active system,
The performance monitor or the first photodetector transmits an abnormality alarm to the control controller,
When the control controller receives the abnormality alarm, when it is determined from the result of the monitoring of the second optical transmission path that is a non-operating system that the second transmission path is normal, the optical switch An optical 1 + 1 switching device characterized by transmitting a switching request.

In the optical 1 + 1 switching device according to claims 1 to 3,
The controller detects presence / absence of an abnormality in the transmission path based on an abnormality alarm from the performance monitor, the first photodetector, or the second photodetector, and holds information on the presence / absence of the abnormality. An optical 1 + 1 switching device characterized by that.

Further comprising a management system that communicates with the controller and monitors performance / alarms or controls the device;
The management system sends a check request for confirming a state of a non-operating transmission line at a predetermined time, a predetermined period from the time of switching the optical switch, and a predetermined timing such as a time / period according to the number of requests. Sent to the controller
5. The optical 1 + 1 switching device according to claim 1, wherein the controller transmits a switching request to the optical switch in response to the check request.

An optical switch for monitoring that outputs an optical signal from the first optical transmission line to either the optical switch or the port;
When the first optical transmission line is not used in an operational system, the port outputs a signal of the first optical transmission line by switching control of the monitoring optical switch. The optical 1 + 1 switching device according to claim 1.

A first optical switch for monitoring that outputs an optical signal from the first optical transmission line to either the optical switch or the first port;
A second monitoring optical switch for outputting an optical signal from the second optical transmission line to either the optical switch or the second port;
When the first optical transmission line is not used in the operating system, the first optical transmission line signal is output to the first port by switching control of the first monitoring optical switch.
When the second optical transmission line is not used in the operating system, the second optical transmission line signal is output to the second port by switching control of the second monitoring optical switch. An optical 1 + 1 switching device according to any one of claims 1 to 5,

The optical switch is a two-input two-output optical switch, and either the optical signal of the first optical transmission path or the optical signal of the second optical transmission path is input to each of the two inputs. Out of output 1 The optical signal from one output is received by the performance monitor, 1 6. The optical 1 + 1 switching device according to claim 1, wherein optical signals from one output are transmitted to a port.

8. The optical 1 + 1 switching according to claim 5, further comprising an optical signal receiver and a received signal performance monitor for monitoring a non-operational transmission line connected to the port. apparatus.

The control controller transmits optical switch route selection information to the upstream side, and displays whether the first transmission path or the second transmission path is the active system based on the optical switch route selection information sent from the downstream side. The optical 1 + 1 switching device according to claim 1, wherein the optical 1 + 1 switching device is provided.

A first performance monitor that converts an optical signal transmitted through the first optical transmission path into an electrical signal to perform performance monitoring, converts the electrical signal into an optical signal again, and outputs the optical signal;
A second performance monitor for converting an optical signal transmitted through the second optical transmission path into an electrical signal to perform performance monitoring, converting the electrical signal into an optical signal again, and outputting the optical signal;
A first photodetector for monitoring the magnitude of an optical signal transmitted through the first optical transmission line;
A second photodetector for monitoring the magnitude of an optical signal transmitted through the second optical transmission line;
An optical switch for selecting one of an optical signal transmitted through the first optical transmission line and an optical signal transmitted through the second optical transmission line;
Depending on the results of optical signal monitoring by the first performance monitor and the first photodetector, and the second performance monitor and the second photodetector, the first transmission line or An optical 1 + 1 switching device, comprising: a controller that controls the optical switch so as to select the second transmission path.

The optical signal transmitted through the first optical transmission line is converted into an electrical signal to perform performance monitoring, and when the performance monitoring determines that the first transmission line is abnormal, the optical signal is cut off. When the first optical transmission line is determined to be normal, the first performance monitor outputs the electrical signal again by converting the electrical signal; and
The optical signal transmitted through the second optical transmission line is converted into an electrical signal for performance monitoring, and if the result of the performance monitoring determines that the second transmission line is abnormal, the optical signal is cut off. When the second optical transmission path is determined to be normal, the second performance monitor outputs the electrical signal again by converting the electrical signal;
A first photodetector for monitoring the magnitude of the optical signal from the first performance monitor ;
A second photodetector for monitoring the magnitude of the optical signal from the second performance monitor;
An optical switch for selecting one of an optical signal transmitted through the first optical transmission line and an optical signal transmitted through the second optical transmission line;
The optical switch is controlled to select the first transmission path or the second transmission path according to the result of monitoring the optical signal by the first photodetector and the second photodetector. An optical 1 + 1 switching device comprising a control controller.

The optical signal transmitted through the first optical transmission line is converted into an electric signal for performance monitoring, and either the optical signal is cut off or the electric signal is converted into an optical signal again and output. A first performance monitor that can be selected and
The optical signal transmitted through the second transmission path is converted into an electric signal for performance monitoring, and either the optical signal is cut off or the electric signal is converted into an optical signal again and output. A second performance monitor that can be selected and performed;
An optical combiner that combines and outputs the optical signal from the first performance monitor and the optical signal from the second performance monitor;
When the result of the performance monitoring is received from the first performance monitor and it is determined that there is an abnormality in the first transmission line, a signal is transmitted to the first performance monitor so as to cut off the optical signal. Further, when the result of the performance monitoring is received from the second performance monitor and it is determined that there is an abnormality in the second transmission line, the second 2 And a controller for transmitting a signal to cut off the optical signal to the performance monitor.