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采用全矢量的方法,数值求解了内包层为左手材料,纤芯和外包层为常规材料的W型弱导双包层光纤的特征方程,分析了其模式分布、色散和时延特性。结果表明内包层为左手材料的双包层光纤具有许多不同于常规光纤的反常特性:单模传输模式只存在于特定的频率范围内;随着内包层负折射材料厚度的增加,同一模式同一频率下出现不同的传播常数;内包层厚度对单模的色散和群时延影响巨大,通过增大内包层厚度,可以达到-158000 ps/(nm.km)大负色散及极大的群时延。这些结果为设计新型色散补偿光纤及新型光纤器件提了供理论基础。
The full-vector method is used to numerically solve the characteristic equation of the W-type weak double-clad optical fiber with the inner cladding as the left-handed material and the core and the outer cladding as the conventional materials. The mode distribution, dispersion and delay characteristics are analyzed. The results show that the double-clad fiber with inner cladding as the left-handed material has many anomalous characteristics that are different from those of the conventional fiber. The single-mode transmission mode exists only within a specific frequency range. With the increase of the thickness of the negative- And different propagation constants. The thickness of the inner cladding has a great influence on the dispersion and the group delay of the single mode. By increasing the thickness of the inner cladding, a large negative dispersion of -158000 ps / (nm.km) and a great group delay . These results provide a theoretical basis for the design of new types of dispersion compensation optical fiber and new optical fiber devices.