Optical transmission control method, optical transmission control device, and optical transmission system

Claims

1. An optical transmission control method for controlling an optical path comprising a first optical transmission termination device, one or more first optical transmission devices having an ADD / DROP function for adding or extracting an optical signal of a specific wavelength to an optical signal and a multiple-to-multiply / multiply function for multiple-to-multiply or multiply the optical signal, one or more second optical transmission devices having a cross-connect function for switching the optical signal, and a second optical transmission termination device, If the optical signal transmitted from the first optical transmission termination device cannot be restored by the second optical transmission termination device, one device is sequentially selected from the one or more first optical transmission devices and the one or more second optical transmission devices to fold the optical signal back towards the first optical transmission termination device, and the bit error rate when the folded optical signal is received by the first optical transmission termination device is compared to identify the suspected location causing the inability to restore the optical signal. A method for controlling optical transmission characterized by the following.

2. A first optical transmission termination device, one or more first optical transmission devices having an ADD / DROP function for adding or extracting optical signals of a specific wavelength to an optical signal and a multiplication / demultiplication function for multiplication or demultiplication of optical signals, one or more second optical transmission devices having a cross-connect function for switching optical signals, and the second optical transmission termination device having a communication unit that communicates via a network, An optical transmission control device for controlling an optical path comprising the first optical transmission termination device, the one or more first optical transmission devices, the one or more second optical transmission devices, and the second optical transmission termination device, The system includes a control unit that, when an optical signal transmitted from the first optical transmission termination device cannot be restored by the second optical transmission termination device, sequentially selects one of the one or more first optical transmission devices and the one or more second optical transmission devices via the communication unit to fold the optical signal back towards the first optical transmission termination device, and identifies the suspected location of the cause of the inability to restore the optical signal by comparing the bit error rate when the folded optical signal is received by the first optical transmission termination device. An optical transmission control device characterized by the following.

3. An optical transmission control device for controlling an optical path comprising a first optical transmission termination device, one or more first optical transmission devices having an ADD / DROP function for adding or extracting optical signals of a specific wavelength to an optical signal and a multiple optical transmission device for multiple optical signals, one or more second optical transmission devices having a cross-connect function for switching optical signals, and a second optical transmission termination device, The first optical transmission termination device, the one or more first optical transmission devices, the one or more second optical transmission devices, and the second optical transmission termination device, and a communication unit that communicates via a network, The system includes a control unit that, when an optical signal transmitted from the first optical transmission termination device cannot be restored by the second optical transmission termination device, sequentially selects one of the one or more first optical transmission devices and the one or more second optical transmission devices via the communication unit to fold the optical signal back towards the first optical transmission termination device, and identifies the suspected location of the cause of the inability to restore the optical signal by comparing the bit error rate when the folded optical signal is received by the first optical transmission termination device. An optical transmission control device characterized by the following.

4. After identifying the suspected location, the control unit determines the factor causing the degradation of the optical signal at the suspected location by comparing a first evaluation value when the first optical transmission termination device receives an optical signal that has been folded back in a first optical path containing the suspected location, and a second evaluation value when the first optical transmission termination device receives an optical signal that has been folded back in a second optical path that does not contain the suspected location. The optical transmission control device according to claim 2 or 3, characterized by the above.

5. The first evaluation value and the second evaluation value are signal-to-noise ratios calculated using the known pattern, The control unit determines that the factor is an optical amplifier when the difference between the first evaluation value and the second evaluation value is greater than a threshold. The optical transmission control device according to claim 4, characterized by the above.

6. The first evaluation value and the second evaluation value are frequency characteristics obtained by frequency analysis of the known pattern. The control unit determines that the factor is an optical filter when the difference between the first evaluation value and the second evaluation value is greater than a threshold. The optical transmission control device according to claim 4, characterized by the above.

7. An optical path comprising a first optical transmission termination device, one or more first optical transmission devices, one or more second optical transmission devices, and a second optical transmission termination device, An optical transmission system comprising an optical transmission control device for controlling the optical path, Each of the one or more first optical transmission devices is: A first optical signal transmitting and receiving unit that transmits and receives optical signals, The optical signal ADD / DROP function unit adds or extracts an optical signal of a specific wavelength to the optical signal received by the first optical signal transmitting / receiving unit, A first turnback function unit that returns the optical signal processed by the optical signal ADD / DROP function unit back to the optical signal ADD / DROP function unit and transmits it from the first optical signal transmitting / receiving unit, A second optical signal transmitting and receiving unit that transmits and receives optical signals, An optical signal combining / decompression function unit performs combining or decompression on the optical signal received by the second optical signal transmitting / receiving unit, A second turnback function unit returns the optical signal processed by the optical signal multiplexing / demultiplexing function unit to the optical signal multiplexing / demultiplexing function unit and transmits it from the second optical signal transmitting / receiving unit, It comprises a first communication unit that communicates via a network, Each of the one or more second optical transmission devices is: A third optical signal transmitting and receiving unit that transmits and receives optical signals, A fourth optical signal transmitting and receiving unit that transmits and receives optical signals, An optical signal cross-connect function unit that performs switching of optical signals received by the third optical signal transmitting / receiving unit and the fourth optical signal transmitting / receiving unit, A third turnback function unit that receives an optical signal in the third optical signal transmitting / receiving unit and processes it in the optical signal cross-connect function unit, folds it back to the optical signal cross-connect function unit, and transmits it from the third optical signal transmitting / receiving unit, and a third turnback function unit that receives an optical signal in the fourth optical signal transmitting / receiving unit and processes it in the optical signal cross-connect function unit, folds it back to the optical signal cross-connect function unit, and transmits it from the fourth optical signal transmitting / receiving unit, It comprises a second communication unit that communicates via the aforementioned network, The optical transmission control device is The first optical transmission termination device, the one or more first optical transmission devices, the one or more second optical transmission devices, and the second optical transmission termination device, and a third communication unit that communicates via a network, The system includes a control unit that, when an optical signal transmitted from the first optical transmission termination device cannot be restored by the second optical transmission termination device, sequentially selects one of the one or more first optical transmission devices and the one or more second optical transmission devices via the third communication unit to fold the optical signal back towards the first optical transmission termination device, and identifies the suspected location of the cause of the inability to restore the optical signal by comparing the bit error rate when the folded optical signal is received by the first optical transmission termination device. An optical transmission system characterized by the following.