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中文摘要：
利用耦合模理论对双芯光纤的耦合特性进行了分析，结果表明，双芯光纤的耦合系数与输入信号的波长、光纤直径、2个纤芯间的标准化距离以及光纤的相对折射率差有关，对双芯光纤的参数进行优化可达到最佳效果．在耦合模理论的指导下，提出了一种改进的双芯光纤的制作方法．实验结果表明，该制作方法较原有方法有很大改进．
英文摘要：
The coupling coefficient of twin-core fiber （TCF） is discussed. It is shown that the coupling coefficient is related with the input signal wavelength, the core diameter, the distance between the centers of the two cores, and the relative refractive index difference. The parameters of the twin-core fibers can be optimized to satisfy different requirements. The twin-core fibers are fabricated. From measurement, an obvious progress is shown better than the previous work.
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