设计了一种温度调控的液晶填充光子晶体光纤, 利用有限元法对光子晶体光纤的色散补偿特性进行数值模拟.从理论上分析了各结构参数对光子晶体光纤色散产生的影响, 并进行结构参数优化.通过调节液晶折射率, 将色散补偿位置精确调节至1 550 nm处, 负色散峰值为－426 000 ps·nm－1·km－1, 2 m长液晶填充光子晶体光纤可以补偿50 000 m的标准单模光纤(G652).模拟结果显示,色散补偿波长随填充液晶有效折射率指数发生变化, 通过温度调节可以实现1 533 nm~1 552 nm波长内的定量控制.

A temperature-controlled liquid crystal filling photonic crystal fiber was designed. The dispersion compensation characteristics of photonic crystal fiber were numerically simulated by using the finite element method. The effects of various structural parameters on the photonic crystal fiber dispersion were theoretically analyzed. And the structure parameters were adjusted. By adjusting the liquid crystal′s refractive index, dispersion compensation location can be precisely adjusted to 1 550 nm, the peak of negative dispersion is －426 000 ps·nm－1·km－1. A 2-meter-long designed fiber can compensate a 50 000-meter-long standard single-mode fiber (G652). The simulation results show that the dispersion compensation wavelength changes with the effective refractive index of the filled LC, and it might be quantitatively controlled by the temperature adjustment in the wavelength range from 1 533 nm to 1 552 nm.