effective flow area of core 堆芯有效流通面积
To capture the effective area and lower down the dependence to the image quality, we first check the core point.
该方法先通过核心点的检测来确定有效的指纹面积，并且在处理过程中降低了对图像增强的依赖；
With the increase of the effective mode field area of the first core, the switch threshold power increases.
增大第一纤芯的有效模场面积将导致开关的阈值增大。
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