Passive fiber loop(PFL) is an important fiber basic device that plays a significant role in many fields including optical communication and fiber sensor.
无源光纤环是一种重要的光纤基础器件，在光纤通信和光纤传感等技术中具有重要的应用。
Fused-taper optical fiber devices are the most typical and basic optical passive devices, which are widely used in the field of fiber communication and fiber sensor.
熔锥型光纤器件是全光器件中最具代表性，也是构成其它器件的一种基础器件，在光纤传感和光纤通信中得到了广泛使用。
The present paper introduce mainly basic principle, device characteristic and making method of long-period fiber grating and outlines the application status in optical communication and sensor system.
介绍长周期光纤光栅基本工作原理、器件特性和制备方法，同时对这种器件在光通信和传感系统中的应用状况作了简要概述。
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