中文摘要：

双芯光纤是一种具有特殊折射率分布的特种光纤,基于双芯光纤制作的光纤器件被应用于多个领域。首先介绍了双芯光纤的发展历史,然后阐述了双芯光纤的种类及其基本特点,并重点叙述基于双芯光纤的耦合型滤波器和Mach-Zehnder干涉仪滤波器的原理及其改进技术,同时也介绍了它的其他应用,最后进行小结。

英文摘要：

The dual-core fiber is a special optical fiber, which has the special refractivity distribution, and the devices based on dual-core fiber are applied in many fields. The development of dual-core fiber is introduced briefly, then the types of dual-core fiber and its basic characteristics are described. Moreover, the principle of coupling filters and interferometers based on dual-core fiber and their improved technology are introduced emphatically, and other applications are introduced. Finally a conclusion is given.