长周期光纤光栅及其在通信传感领域的新应用

长周期光纤光栅是一种新型光纤器件。介绍了长周期光纤光栅的耦合机理、制备方法以及应用。其耦合机理是前向传输的纤芯基模与前向传输的各阶包层模式之间的耦合。制备原理是对光纤横向曝光,使光纤的折射率指数在轴向发生周期性变化。阐明了长周期光纤光栅用于带通滤波、光上下路复用、光纤光源、光纤耦合、偏振器件、新型传感等新技术领域的思路,给出了具体实现方法。并通过与其他方案对比,说明了基于长周期光纤光栅器件的优点,肯定了长周期光纤光栅在通信传感领域的价值。

Long period fiber grating and its new applications in communication and sensing

WT5BZ]Long period fiber grating(LPFG) is a new kind of optical fiber element. The paper presents its mode coupling mechanism, the fabrication methods as well as its applications. The coupling is between forward propagating core fundamental modes and forward-propagating cladding modes. By transverse exposure, periodical modulation of refractive index is formed along the axis of optical fiber. Ideas about applications of LPFG to band pass filters, optical add/drop multiplexing, optical fiber sources, coupling of fibers, optical fiber polarizers and novel sensing are illustrated. In comparison with other schemes, advantages of the LPFG based devices and an important role of the LPFG in communication and sensing technology are demonstrated in detail.WT5HZ]