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AssigneesMitsubishi Electric Corporation, Kddi Corporation
InventorsJunichi Nakagawa, Keiji Tanaka, Masato Kuwazuru, Noboru Edagawa
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In a downstream channel communication, an individual downstream channel wavelength is allocated to each group of user nodes, and for user nodes in a same group, a central office performs a downstream-signal communication by a same communication method using the individual downstream channel wavelength. In an upstream channel communication, all user nodes perform an upstream-signal communication with the central office using a single upstream channel. A downstream signal from the central office is distributed to the groups for each individual downstream channel wavelength, and upstream signals from the user nodes are transmitted to the central office in a multiplexing manner.
An optical communication network system in which a central office and a plurality of user nodes are connected via an optical transmission path and a bidirectional communication is performed between the central office and the user nodes, wherein
A central-office optical communication device for an optical communication network system in which a central office and a plurality of user nodes divided into a plurality of groups are connected via an optical transmission path and a bidirectional communication is performed between the central office and the user nodes, wherein
A user-node optical communication device for an optical communication network system in which a central office and a plurality of user nodes divided into a plurality of groups are connected via an optical transmission path and a bidirectional communication is performed between the central office and the user nodes, wherein
Dependencies are inferred from the claim text.