A wavelength-divided multiplex interactive light communication paths for 1.31µm and 1.55µm bands simultaneously switched by use of control light (660nm) have been developed using a novel palmtop-size photo-switch based on light-controlled switching of light path. The study will provide a key device for implementing the commercialization of "light-tagged photo packet communication system".

Combined N units of light-controlled photo-switch, is to build up an interactive optical communication system of (N+1:1) configuration, and simultaneous illumination with signal light and control light used as a light tag enables to realize an interactive optical packet communications for target destinations through light control only, which will be open the way to provide a low cost key device for the development of next generation optical communications system.