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.
The coupled way with globular lens in end side of step index fiber(SIF) is a simple and practical method to increase the coupling efficiency between semiconductor optical resource and SIF.
采用光纤端面球透镜耦合方式，是提高半导体光源与阶跃折射率光纤之间耦合效率的简单实用的方法。
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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.