最后，本文又对一种低折射率芯光子晶体光纤基模束缚损耗特性进行了分析。

Lastly, the fundamental mode loss of a special kind of depressed-index core PCF is analyzed.

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利用泰勒展式的一级近似，得到了缺陷模频率的解析表达式，进而得到紧束缚理论中的耦合因子。

Under the first-order approximation of Taylor expansion, the analytic expression for the defect mode frequency is derived, from which the coupling factor is deduced.

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利用泰勒展式的一级近似，得到了缺陷模频率的解析表达式，进而得到紧束缚理论中的耦合因子。

Under the first-order approximation of Taylor expansion, the analytic expression for the defect mode frequency is derived, from which the coupling factor is deduced.

youdao