A photonic crystal (PhC) all-optical OR-transformation logic gate, which comprises an optical-switch unit (OSU), a PhC-structure unit, a reference light, a wave-absorbing load (WAL) and a D-type flip-flop (DFF) unit; two system-signal-input ports are respectively connected with a first logic-signal X1 and a second logic-signal X2; the reference light is connected with the reference-light-input port of the OSU; three intermediate-signal-output ports are respectively connected with two intermediate-signal-input ports of the PhC-structure unit and the WAL; a clock-signal CP through the input port of a two-branch waveguide are respectively connected with a first clock-signal CP input port of the OSU and a second clock-signal-CP-input port of the DFF unit; the signal-output port of the PhC-structure unit is connected with the D-signal-input port of the DFF unit. The structure of the present invention is compact in structure, strong in anti-interference capability and ease of integration with other optical-logic elements.
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