| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical communication method that can conduct optical communication without revamping a transmitter even on the occurrence of an unexpected fluctuation in traffic or of a failure between nodes. SOLUTION: When the quantity of traffic caused from a node 104a to a node 104b is small, a light with a wavelength λ2 is transmitted from the node 104a to the node 104b as a signal through a path 105. When the traffic between the nodes 104a and 104b increases resulting in exceeding the transmission capacity of the signal path 105, after confirming the margin of the transmission capacity of signal paths 106, 107, the excess signal is once sent from the node 104a to a node 104c by means of a light with a wavelength λ3, the node 104c converts the light into an electric signal, the electric signal is again converted into an optical signal with a wavelength λ4 in the node 104c and the node 104c transmits the optical signal to the node 104b. That is, the signal is transmitted via the signal paths 106, 107. |
