In this paper, when assuming a Gaussian near field distribution on the cross section of single-mode fiber, it has been derived theoretically that the far field is also a Gaussian distribution.
本文在假定单模光纤横端面上的近场为高斯分布的前提下，从理论上导出了其远场分布也是高斯分布。
The mode dispersion characteristics and cut-off properties of rib waveguide with trapezoidal cross section are investigated.
变换伽辽金法对具有梯形截面脊形光波导的本征模式特性作了分析。
The main mode of thinking on the study of regional historical geography is erecting the continuous geographical cross section.
建立连续的区域历史地理剖面是区域历史地理研究的重要思路。
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