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Schematic of various of MZI switch cells: (a) Adiabatic T-O MZI switch (b) T-O switch with bent couplers (c) E-O switch with two-section couplers (d) E-O switch with spiral phase shifter (e) T-O switch with folded phase shifter (f) T-O switch array (g) T-O switch with variable coupler (h) E-O switch with push-pull driving scheme (i) E-O switch with nested MZI phase shifter.
