Patent ID: 7826744
Filing Date: 2010-11-02
Classification: H04B,H04J,H04Q

Abstract:
1. An optical network system, comprising: a central node; and a plurality of user nodes connected to said central node through transmission lines such that optical signals can be transmitted and received between said user nodes through said central node; said central node including a ring transmission line and a plurality of branching/insertion sections successively interposed on said ring transmission line for branching/inserting optical signals between said ring transmission line and said user nodes, each of said branching/insertion sections including a central node side multiplexing section for multiplexing optical signals from the corresponding user node with light on said ring transmission line, a passage blocking section for blocking wavelength components of the light propagated along said ring transmission line which correspond to wavelength components of the optical signals from the corresponding user node from passing therethrough to the branching/insertion section on the downstream side, and a central node side branching section for branching and outputting the light propagating along said ring transmission line to the corresponding user node; each of said user nodes including a transmission section capable of outputting optical signals to which transmission wavelengths different from those of the other user nodes are set and a reception section for extracting selected optical wavelength components from within the branched light supplied thereto from the corresponding central node side branching section and extracting reception signals from the extracted light wavelength components.