Base silicon layer - the silicon wafer that is located underneath the insulator layer, which supports the silicon film on top of the wafer.
底部硅层?-在绝缘层下部的晶圆片，是顶部硅层的基础。
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Silicon-on-insulator (abbreviated as SOI) optical waveguide is the base of silicon-based optical waveguide devices and other integrated optical devices.