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In this paper, we present a four-channel wavelength division demultiplexer which is designed by means of cascading three $$1\times 2$$ 1×2 multimode interference couplers. The proposed structure separates 980, 1310, 1490, and 1550 nm wavelengths into the appropriate ports. These wavelengths have been chosen for separation due to their importance in the optical communication systems. The performance...