非线性阶跃型折射率光纤基模传播常数的变分公式

The Variational Formulas of the Fundamental Mode Propagation Constant in NonlinearStep-index Fiber

用变分法导出了克尔型（Ｋｅｒｒ—ｌａｗ）非线性阶跃型折射率光纤基模的传播常数公式结果表明，光束功率对基模的传播常数有显著影响。

The propagation constant formulas of the fundamental mode in Kerr-lawnonlinear step-index fiber are derived by the variational method.It is shown that the optical beam power has great effect on the propagation constant of the fundamental mode.