用EI-RPS方法计算矩形有源波导的模式增益

结合有效折射率(EI)方法和RPS(实折射率／微扰／打靶)方法，对矩形有源波导的模E^y11和E^x11增益进行了计算。分析了包层宽度以及有源层宽度对模式增益的影响。并将计算结果和一维RPS的结果作了比较。计算结果表明，模式增益随包层宽度增加而减小，随有源层宽度增加而增加。在包层宽度大于有源层厚度5倍且有源层宽度大于有源层厚度10倍时，EI—RPS方法的计算结果和一维RPS方法计算的结果一致。在不满足上述条件的情况下，EI—RPS方法解决了一维RPS方法不能解决的问题。

EI-RPS Method for Calculating the Mode Gain of a Rectangular Active Waveguide

An EI-RPS(Real refractive index/pertueb/shoot) method,which combines the Effective-Index method and the RPS method, is proposed to calculate the mode gain of a rectangular active waveguide.By using this method,the relation between the mode gain and the waveguide lateral structure can be analysed. The calculation shows that the mode gain increases with the increase of active layer width and with the decrease of clad layer width. 1D RPS method is a good approximation while the width of active layer is 10 times wider than the thickness of active layer and the clad layer width is 5 times wider than the thickness of active layer.