The properties of long period gratings in photonic crystal fibers (PCFLPG) are systematically analyzed by the improved full-vector effective index model and the coupled mode theory.

将修正的矢量等效折射率模型和耦合模理论相结合，系统地研究了光子晶体光纤长周期光栅(PCFLPG)的特性。

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By the gaussian approximation and local mode-coupled theory, fused splice loss of step and parabolic index single mode elliptic core fibers have been analyzed, calculated and discussed.

采用高斯近似和局域模式耦合理论，对阶跃折射率分布和抛物线折射率分布椭圆芯单模光纤熔接接头损耗进行了分析、计算和讨论。

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Within the coupled resonant frequency region, the negative index of refraction can be achieved.

在负的磁导率和负的介电常数重叠的频率区域，能得到一个负的折射系数。

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For organizations on a tighter budget, the Predictive Index is a good tool, when coupled with effective manager training.

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That news, coupled with a slightly hotter inflation reading--the Producer Price Index rose 1.4% in January, above the anticipated 0.8%--weighed on shares as the Street got a soft open.

FORBES: Magazine Article

An upward trending relative strength index (approaching, but not yet in oversold territory), coupled with an ADX line above both DMI lines, indicates Citi has the momentum.

FORBES: Citigroup: Let's Hear It For The Boy