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研究了一种具有双包层结构的包层模谐振特种光纤,该特种光纤具有一个低折射率内包层,基于耦合模原理,纤芯模与包层模之间发生谐振耦合,从而获得具有带阻特性的传输光谱。系统介绍了包层模谐振光纤的制备、传输原理及其弯曲、溶液折射率、折射率/温度双参量等传感特性。实验和理论研究结果表明,包层模谐振特种光纤对于弯曲、溶液折射率参量具有良好的敏感性,此外,通过内包层掺杂可以调节包层模谐振光谱的温度敏感特性。
A kind of clad-mode resonant special fiber with double-clad structure is studied. The special optical fiber has a low-refractive-index inner cladding. Based on the coupled-mode principle, resonance coupling occurs between the core mode and the cladding mode, Transmission characteristics of the resistance spectrum. The preparation, transmission principle and bending, solution refractive index, refractive index / temperature bi-parameter sensing characteristics of cladding mode resonant fiber are systematically introduced. The experimental and theoretical results show that the cladding mode resonant fiber is sensitive to the refractive and refractive index of the cladding. In addition, the temperature sensitivity of the cladding mode resonance can be adjusted by doping the inner cladding.