Abstract
AbstractPower‐splitter is one of the fundamental elements for photonic integrated circuits. Y‐junction, multi‐mode‐interference (MMI), and directional coupler may have been widely used as power splitter; however, the design theory to realize precise asymmetric splitting ratio is not well established. In addition, the device length is relatively long and less robustness in general. To realize a power splitter with a desired splitting ratio, the authors used a nano‐pixel structure. Nano‐pixel structures consist of an array of pixels in which the rectangular waveguide region is divided into many nano‐scale regions. The implemented devices were realized in an area of 3.2 μm × 3.4 μm. The device exhibited precise asymmetric splitting of 1.7:1 successfully at 1550 nm.
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