Optical signal processing has higher capabilities and larger bandwidth for high-speed information processing as compared to traditional microelectronics technology. Therein, optical logic gates play a crucial role in high-speed digital photonic computing. However, signal competition during processing can restrict performance. Our designed scheme of high-speed optical domain signal logic operation based on one simple dual-drive Mach-Zehnder modulator is discussed, and multiple logical operations can be achieved by controlling the phase difference between two coherent optical signals in our numerical simulation experiments. An optimization scheme is proposed that addresses signal competition using a sliding window filter, which improves the efficiency and accuracy of digital photonic computation, data rate of 40 Gb/s can be reached. By optimizing the system design of optical logic gates, our scheme can process high-speed data more ef-fectively and reliably. Therefore, a simple, low-cost, reconfigurable, and high-speed optical logic gate computation scheme is proposed, which is helpful for future photonic computing and optical communications.