Research Article

The Critical Adiabatic Linear Tapered Waveguide Combined with a Multimode Waveguide Coupler on an SOI Chip

Figure 6

The width of a linear tapered waveguide (a) Wt = 1.4 μm, Wmmi = 4 μm; (b) Wt = 2.8 μm, Wmmi = 8 μm; (c) Wt = 4.2 μm, Wmmi = 12 μm; with divergence angle θ of a linear tapered waveguide ranging from 1° to 45°. The maximum divergence angle for linear tapered waveguide is achieved at θ = 16°/14°/8° for Wt = 1.4 μm/2.8 μm/4.2 μm, respectively.
(a)
(b)
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