The performance comparison of two configurations of broadband Mach-Zehnder Switches exploiting, respectively, two and three waveguides, assembled into 4x4 matrices is reported in this paper. The simulations are performed by the Finite Element Method and the Finite Difference Beam Propagation Method. In particular, we have found that, to parity of maximum insertion loss, about equal to 1 dB for the single switch and 3 dB for the 4x4 matrix, the proposed three-waveguide configuration exhibits an almost doubled bandwidth Δλ=115 nm, making it suitable for efficient routing of the Wavelength Division Multiplexing signals over photonic Networks on Chip.
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