光交叉互连的基本核心元件是光开关。
Optical switching is basic component in optical cross connector.
偏光器件是偏光信息处理和偏光技术应用的核心元件；
The polarizer is the key component in the treating of polarized information and the application of polarized technique.
码盘、光栅盘是光电位移精密测量仪器和光栅计量测试设备中的核心元件。
Code disc or grating disc is the core component of photoelectric displacement precision measuring instrument and grating measuring equipment.
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