短語詞組短語directional -coupler attenuator 定向耦合器式衰減器directional waveguide coupler formed 定向耦合器directional U coupler 定向耦合器Reconfigurable directional -coupler 可重構定向耦合器optical directional full coupler 光方向完全耦合器directional E coupler 定向耦合器adiabatic optical directional full coupler 絕熱式光方向完全耦合integrated directional coupler 集成定向耦合器wideband directional coupler 寬帶定向耦合器 返回 directional coupler