定向耦合器是四端口网络,直接设计十分困难。
An inconvenience of prism couplers is that the prism material must have a high refractive index.棱镜耦合器的一个不方便的地方是棱镜材料必须有较高的折射率。
The transmission characteristics of all_fiber filter composed of double fiber directional couplers were studied.分析了由双光纤定向耦合器组成的梳状滤波器的透射特性。