Optical device having switching function

摘要

An optical device having a switching function has a waveguide filter for switching whether input signal light of including at least one specific wavelength should be transmitted or reflected. The input signal lights of wavelength of lambda 1 DIFFERENCE lambda n are transmitted to the input waveguide. When the waveguide filter is off, the signal lights of all wavelength are transmitted to the output port. When the waveguide filter is on, the signal light of wavelength of lambda 2 DIFFERENCE lambda n are transmitted, but the signal light of wavelength of lambda 2 is reversed and output to the drop port. If the thin film heaters are off, a signal light of wavelength of lambda 1 is output (dropped) from the drop port. If the thin film heaters are on, it is reversed and transmitted to the output port.