| 摘要 |
PURPOSE:To attain optical communication between plural LANs or the like whose operating optical wavelength differs from each other by connecting optical signal transmission media for plural networks in a ring as a whole in series via an optical wavelength conversion means. CONSTITUTION:Each end of an optical fiber cable 3 being an optical signal transmission medium for two LANs 1, 2 is connected in series by an optical wavelength converter 4 from a long to a short wavelength and an optical wavelength converter 5 from a short to a long wavelength to build up a definite optical communication network system in a ring as a whole. The optical wavelength converters 4, 5 apply only the optical wavelength conversion to connect the LANs 1, 2 and a conversion processing for a protocol or the like is not implemented. Thus, the optical wavelength converters 4, 5 are realized far inexpensively than a gateway device. Through the constitution above, when transmission is implemented from a node of the LAN 1 to a node of the LAN 2, an optical signal of a short wavelength sent from the former node is converted into an optical signal of long wavelength by the optical wavelength converter 5, the result is sent to the LAN 2 and received by the latter node. |
