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中文摘要：
为了抑制通信系统中脉冲的展宽，根据色散补偿理论，提出了一种由单一石英材料制成的双层芯光子晶体光纤（DCCPCF）．该光纤的色散值在1．55μm处可达到-6000ps／（nm·km）．理论分析表明，在传输过程中内芯基模和外芯缺陷模以相位匹配波长为临界状态，在内芯与外芯之间相互交替传输，并在匹配波长处因模式发生强烈耦合而引起折射率产生大幅度波动．通过对结构参数d1、d2变化的情况下色散曲线的扰动情况进行分析，可为实际制备工作提供一定的理论指导．
英文摘要：
To restrain the pulse broadening in the communication system, a new type of dual-concentric- core photonic crystal fiber （DCCPCF） composed of single silica material is put forward based on the theory of dispersion compensation. The dispersion value of fundamental mode can achieve up to - 6 000 ps/ （nm＇km） at 1.55 μm. Analysis indicates that the inner core fundamental and outer core defect mode with phase-matching wavelength （Ap） as a critical state will propagate forward alternatively between the inner and outer core region, and the effective indices intensely appears fluctuations due to modes coupling at phase-matching wavelength. By analyzing the perturbation of dispersion with two structure parameters d1, d2 changing, the instruction for actual fabrication at a certain extent is provided.
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