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本文通过选用合适的试探函数导出了一个简单而精确的公式: V_ ~2=1/3∫_0~1[1-f(ρ)](ρ~3-4/3ρ~4+4/9ρ~5)dρ用以确定任意剖面的单模光纤的TE_(01)模的截止频率。
In this paper, we derive a simple and accurate formula by choosing the appropriate trial function: V_ ~ 2 = 1/3 ∫_0 ~ 1 [1-f ρ] (ρ ~ 3-4 / 3ρ ~ 4 + 4 / 9ρ ~ 5) dρ is used to determine the cut-off frequency of the TE_ (01) mode of single-mode fiber with arbitrary cross-section.