光纤无源器件是光纤通信系统中的重要组成部分。按其功能分类，有光纤连接器、光纤耦合器、波分复用器、光开关、光衰减器、光隔离器和光环行器等。光纤通信系统正在向接入网、宽带网、密集波分复用系统和全光网方向发展，对光纤无源器件的技术提出了新的更高的要求。因此，如 Optical passive components are an important part of optical fiber communication systems. According to their functional classification, there are optical connectors, fiber optic couplers, wavelength division multiplexers, optical switches, optical attenuators, optical isolators and optical circulators. Optical fiber communication system is to the access network, broadband network, Dense Wavelength Division Multiplexing system and all-optical network direction, the technology of optical fiber passive devices put forward new and higher requirements. So, for example