双层芯色散补偿光子晶体光纤

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55μm处可达到-6000ps/(nm〖DK〗•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d1、d2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.

Dual-Concentric-Core Photonic Crystal Fiber for Dispersion Compensation

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〖DK〗•km) at 155μm. Analysis indicates that the inner core fundamental and outer core defect mode with phase matching wavelength (λp) 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 d1, d2 changing, the instruction for actual fabrication at a certain extent is provided.