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利用近似解析方法，详细地讨论了含金属覆盖层介质波导在截止点附近的模式传播特性和截止条件，并结合有效折射率方法讨论了脊高和脊宽对脊形波导截止条件的影响，设计了一种双异质结截止型强度调制器。
By using the approximate analytical method, the mode propagation characteristics and cut-off conditions near the cut-off point of the metal-clad dielectric waveguides are discussed in detail. The effect of ridge height and ridge width on the ridge cutoff condition of the ridge waveguide is discussed with the effective refractive index method. A double heterostructure end-stop intensity modulator.