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A new method is proposed to map an 2-D crossover network into an 3-D spatial structure. It makes use of an 2 × 4 micro-blazed grating array to realize vertical connections and horizontal connections, and provides straight connections using a mirror. A module of the 3-D crossover network integrating a polarizing beam-splitter, half-wave plate, micro-blazed grating array, half silvered mirror, spatial...
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