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We propose a novel four-port optical switch, which has three possible connection states among the four ports. The device consists of two cross-bar switches, which join with unique connections. We fabricate a four-port optical switch composed of Mach-Zehnder interferometer switches with silicon waveguides; the fabricated switch has a small footprint of 800 × 400 μm2. The three-way switching operation with extinction ratios of up to 30 dB and switching time of 40 μs is demonstrated at telecom wavelengths.