OPTICAL TRANSMISSION SYSTEM AND ADJUSTMENT METHOD
An optical transmission system including: an optical switch that includes a plurality of ports, outputs an optical signal input from any one of the ports from a different one of the ports, and acquires transmission path information on the basis of the optical signal input to the port; a plurality of dispersion compensation units that compensate for quality of the optical signal output from the optical switch and input the optical signal with the compensated quality to the optical switch; an α parameter measurement unit that acquires an α parameter indicating a chirp level on the basis of the optical signal with the compensated quality; and a control unit that performs correction of the α parameter or adjustment of a dispersion compensation amount in a case where a condition indicating that a problem that is attributable to the α parameter has occurred is satisfied on the basis of a cumulative wavelength dispersion amount or a transmission distance obtained on the basis of the transmission path information and the α parameter.
1 . An optical transmission system comprising:
an optical switch configured to include a plurality of ports, outputs an optical signal input from any one of the ports from a different one of the ports, and acquires transmission path information on the basis of the optical signal input to the port;
a plurality of dispersion compensators configured to compensate for quality of the optical signal output from the optical switch and input the optical signal with the compensated quality to the optical switch;
an α parameter measurer configured to acquire an α parameter indicating a chirp level on the basis of the optical signal with the compensated quality; and
a controller configured to perform correction of the α parameter or adjustment of a dispersion compensation amount in a case where a condition indicating that a problem that is attributable to the α parameter has occurred is satisfied on the basis of a cumulative wavelength dispersion amount or a transmission distance obtained on the basis of the transmission path information and the α parameter.
2 . The optical transmission system according to claim 1 ,
wherein the optical switch calculates the cumulative wavelength dispersion amount or the transmission distance on the basis of the transmission path information, and
the controller determines that the condition indicating that the problem that is attributable to the α parameter has occurred is satisfied in a case where the cumulative wavelength dispersion amount or the transmission distance calculated by the optical switch is outside an allowable range obtained on the basis of the α parameter.
3 . The optical transmission system according to claim 1 ,
wherein the optical switch notifies the controller of the transmission path information, and
the controller calculates the cumulative wavelength dispersion amount or the transmission distance on the basis of the transmission path information provided as a notification from the optical switch, and in a case where the calculated cumulative wavelength dispersion amount or transmission distance is outside an allowable range obtained on the basis of the α parameter, the controller determines that the condition indicating that the problem that is attributable to the α parameter has occurred is satisfied.
4 . The optical transmission system according to claim 1 ,
wherein in a case where it is determined that the condition indicating that the problem that is attributable to the α parameter has occurred is satisfied, the controller unit notifies a subscriber device, which is a transmission source of the optical signal, of an α parameter correction value for correcting an α parameter of the subscriber device via the optical switch.
5 . The optical transmission system according to claim 1 ,
wherein the optical switch further includes a dispersion compensation controller that changes a cumulative wavelength dispersion amount of a transmission path,
the controller notifies the optical switch of a cumulative wavelength dispersion correction value for causing the optical switch to change the cumulative wavelength dispersion amount in a case where it is determined that the condition indicating that the problem that is attributable to the α parameter has occurred is satisfied, and
the dispersion compensation controller changes the cumulative wavelength dispersion amount of the transmission path on the basis of the cumulative wavelength dispersion correction value provided as a notification from the controller.
6 . The optical transmission system according to claim 1 ,
wherein the controller further determines that the condition indicating that the problem that is attributable to the α parameter has occurred is satisfied in a case where the cumulative wavelength dispersion amount or the transmission distance calculated by the optical switch is outside a threshold value within a prescribed allowable range.
7 . An adjustment method comprising:
by an optical switch including a plurality of ports, outputting an optical signal input from any one of the ports from a different one of the ports and acquiring transmission path information on the basis of the optical signal input from the port;
compensating for quality of the optical signal output from the optical switch and inputting the optical signal with the compensated quality to the optical switch;
acquiring an α parameter indicating a chirp level on the basis of the optical signal with the compensated quality; and
performing correction of the α parameter or adjustment of a dispersion compensation amount in a case where a condition indicating that a problem that is attributable to the α parameter has occurred is satisfied on the basis of a cumulative wavelength dispersion amount or a transmission distance obtained on the basis of the transmission path information and the α parameter.