Signal routing for fibre optic networks

The invention claims a optical network signal power device and method, a switch device (11,18,21,22) placed the add of the is port or beside; the branch wherein the is provided with a passive optical element, to circulator (13,14), a predetermined change type wavelength signals, which is of a branch unit the signal routes in each port. The capable of which makes the signal is of the branch unit distribution port, or is a capacitor having a specific method. The conversion circuit used of LF2407 to form the wavelength routing device and power socket and.