A novel photonic crystal fiber featured by concentric cores is proposed to induce dispersion controllability by photosensitivity. Chromatic dispersion can be changed from -1827 to 72 psm/km with refractive index modulation of 4 X 10~(-4) produced in Ge-doped regions in the fiber. Effective mode area of inner mode is as small as 6.4 (mu)m~(2). The proposed fiber enables to achieve quasi-phase-matched nonlinear parametric interaction in a single piece of photonic crystal fiber, by periodically alternating dispersion and compensating for phase mismatching caused by the dispersion.
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机译：提出了一种以同心芯为特征的新型光子晶体光纤，通过光敏性来诱导色散可控性。色散可以从-1827更改为72 ps / nm / km，在光纤的掺Ge区域中产生的折射率调制为4 X 10〜（-4）。内部模式的有效模式面积小至6.4μm〜（2）。通过周期性地交替分散色散并补偿由色散引起的相位失配，所提出的光纤能够在单条光子晶体光纤中实现准相位匹配的非线性参量相互作用。
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