A thermo-optic wave-guide switch. The switch selectively switches the paths of
an optical signal. The thermo-optic wave-guide switch includes a multi-mode wave-guide
having an input port, a first output port and a second output port, and a thin
film heater formed on the side of the multi-mode wave-guide. When the thin film
heater does not provide the multi-mode wave-guide with heat and a signal is received
by the input port, the first output port outputs the signal in a cross state according
to the self-image theorem, and when the thin film heater provides the multi-mode
wave-guide with heat and a signal is received by the input port, the second output
port outputs the signal in a bar state.
