本文应用耦合模理论分析了长周期光栅的光谱特性。
The spectral characteristics of a long period fiber grating is analyzed by using the coupled mode theory.
利用耦合模理论分析了在双锥光纤耦合区中声光的相互作用，讨论了在不同耦合区半径下扰动周期与声波频率的关系。
The acoustooptic interaction in biconical optical fiber was analyzed based on coupled mode theory, and the relationship between perturbation period and flexural wave frequency was discussed.
语言模因具有模仿的选择性、复制的周期性以及传播的变异性等特点。
Linguistic meme has the characteristics of the selectivity of imitation, the periodicity of copy and the variability of spreading.
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