Optical path route design device and optical path route design method

An optical path route design device comprising one or more processors configured to execute functions of:

• an all transmission/reception route selection unit to execute processing for an optical network of selecting relay stations in which two transmission/reception end devices to transmit/receive optical signals with each other are arranged, from among a plurality of relay stations connected to each other through optical transmission lines and relaying the optical signals, selecting a route pair of an active system-0 route and a standby system-1 route, which connects the transmission/reception end devices with each other and does not overlap each other, and a backup third route detouring from the route pair via one or more relay stations, and selecting relay stations scattered on the selected third route as candidates in which 3R-capable units to relay optical signals of the predetermined number of wavelengths are arranged for a plurality of optical networks;
• an all candidate selection unit to select all candidate arrangement patterns of shared 3R-capable units as 3R-capable units used for all third routes from among the candidate 3R-capable units on all the third routes selected in the optical networks;
• a shared 3R resource amount confirmation unit to confirm the total resource amount of the shared 3R resource units for each arrangement pattern of the shared 3R-capable units selected by the all candidate selection unit;
• a minimum resource amount update unit to update the minimum resource amount to be set in the shared 3R-capable unit with the confirmed resource amount, when the confirmed resource amount is less than the designed minimum required resource amount of the arrangement pattern set in the shared 3R-capable function unit, and
• a minimum resource 3R selection unit configured to select the arrangement pattern of a shared 3R-capable unit having the minimum resource amount and the resource amount of the shared 3R-capable units, as design candidates, from among the arrangement patterns of the shared 3R-capable units whose resource amount has been confirmed by the shared 3R resource amount confirmation unit and the arrangement patterns of the shared 3R-capable unit whose resource amount has been updated by the minimum resource amount update unit.

An optical path route design method executed by an optical path route design device, the optical path route design method comprising:

• selecting relay stations in which two transmission/reception end devices to transmit/receive optical signals with each other are arranged from among a plurality of relay stations connected to each other through optical transmission lines and relaying the optical signals, selecting a route pair of an active system-0 route and a standby system-1 route, which connects the transmission/reception end devices with each other and does not overlap each other and a backup third route detouring from the route pair via one or more relay stations, and selecting relay stations scattered on the selected third route as candidates in which 3R-capable (3R:
• Regenerate, Reshape, and Retiming) units to relay optical signals of predetermined wavelengths are arranged;
• judging whether or not a shared 3R-capable unit exists in the selected candidate;
• newly selecting a shared 3R-capable unit from among the shared 3R-capable units in the selected candidates, when it has judged as being non-existent;
• and
• selecting, when it has been judged as being existent, one shared 3R-capable unit if there is one existing shared 3R-capable unit, and selecting a shared 3R-capable unit having the maximum number of wavelengths as a resource amount of communication if there is a plurality of existing shared 3R-capable units.

An optical path route design method executed by an optical path route design device, the optical path route design method comprising:

• executing processing for an optical network of selecting in which relay stations in which two transmission/reception end devices to transmit/receive optical signals with each other are arranged, from among a plurality of relay stations connected to each other through optical transmission lines and relaying the optical signals, selecting a route pair of an active system-0 route and a standby system-1 route, which connects the transmission/reception end devices with each other and does not overlap each other and a backup third route detouring from the route pair via one or more relay stations, and selecting relay stations scattered on the selected third route as candidates in which 3R-capable units to relay optical signals of the predetermined number of wavelengths are arranged for a plurality of optical networks;
• selecting all candidate arrangement patterns of shared 3R-capable units as 3R-capable units used for all third routes from among the candidate 3R-capable units on all the third routes selected in the plurality of optical networks;
• confirming the total resource amount of the shared 3R resource units for each arrangement pattern of the selected shared 3R-capable units;
• updating the minimum resource amount to be set in the shared 3R-capable unit with the confirmed resource amount, when the confirmed resource amount is less than the designed minimum required resource amount of the arrangement pattern set in the shared 3R-capable unit, and
• selecting the arrangement pattern of a shared 3R-capable unit having the minimum resource amount and the resource amount of the shared 3R-capable units, as design candidates, from among the arrangement patterns of the shared 3R-capable units whose resource amount has been confirmed and the arrangement patterns of the shared 3R-capable unit whose resource amount has been updated.