A kind of photonic band gap filter for wavelength division multiplexed is discussed with transfer matrix method.

利用传输矩阵法，研究了一种用于波分复用的光子晶体滤波器。

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The relation between the air gap thickness and the peak wavelength in micro-optical electromechanical system (MOEMS) optical tunable filter based on Fabry-Perot etalon is discussed.

分析了基于法布里珀罗腔的微光机电系统可调谐滤波器中，空气腔厚度与峰值波长间的关系。

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The accumulated misregistration errors may cause a visible gap between the two images. A smoothing filter is introduced for removing the visible artifact.

文中还采用平滑滤波器解决了在两幅图像镶嵌出可能由于累积配准误差而出现明显的条缝。

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Those savings may take some time to filter through into hard cash and it may be that the government could fill the gap to allow an immediate pay rise.

BBC: Blair warns strikers they cannot win