We collect distributing of near - field of optical switch output - port . using gaussian curve fit , we measure the extinction ratio of " bar channel " is 8db , and the extinction ratio of " cross channel " is more than 18db 利用红外摄像机采集的光开关输出的近场分布，采用对场光场能量高斯拟合的近似方法，测得该关注入光开关的直通端的消光比可以达到8db ，而反射端的消光比则至少可以达到18db以上。
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