Optical amplifier placement method, optical amplifier placement support apparatus and relay apparatus

An optical amplifier arrangement assistant device, comprising:

• an acquire configured to acquire transmission path information indicating a configuration of a network that transmits an optical signal via a plurality of relay nodes and a transmission path of the optical signal transmitted by the network;
• and
• a determine configured to determine arrangement of optical amplifiers in the network by grouping a plurality of optical fibers passing through the same relay node based on the transmission path information, and to determine whether optical amplification is required in each of the relay nodes for each group of the optical fibers.

A relay device, comprising:

• an acquire configured to acquire transmission path information indicating a configuration of a network that transmits an optical signal via a plurality of relay devices and a transmission path of the optical signal transmitted by the network;
• and
• a determine configured to determine arrangement of optical amplifiers in the network by grouping a plurality of optical fibers passing through this device itself or a plurality of optical fibers passing through the same relay device other than this device, based on the transmission path information, and to determine whether optical amplification is required in each of the relay devices for each group of the optical fibers.