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应用全矢量频域有限差分法,分析了所提出的一种高双折射光子晶体光纤的模式截止、损耗、模场半径及数值孔径等特性。数值模拟结果表明,通过设置合适的结构参量,可使这种高双折射光子晶体光纤在保持模式双折射为10-3量级的前提下,能够在600~1800 nm波长范围内保持单模传输,并且限制损耗可低于10-4dB/m量级,同时还可以获得较大的数值孔径,因而聚光能力增强。此外,通过采用高斯曲线拟合基模的模场分布,得到的模场半径与实际模场半径吻合得很好。
The full-bounded finite difference frequency domain method is used to analyze the mode-cut, loss, mode-field radius and numerical aperture of a proposed high birefringence photonic crystal fiber. The numerical simulation results show that the high birefringence photonic crystal fiber can maintain single-mode transmission in the wavelength range from 600 to 1800 nm with the birefringence of 10-3 in the holding mode by setting suitable structural parameters , And limit the loss can be lower than 10-4dB / m magnitude, but also can obtain a larger numerical aperture, thus concentrating ability. In addition, by using the Gaussian curve to simulate the mode field distribution, the obtained mode field radius is in good agreement with the actual mode field radius.