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本文从理论上对混合应变量子阱结构（既有张应变量子阱又有压应变量子阱）的光学限制因子进行了讨论。由于垒层宽度较小，其变化量也不大，对光学限制影响相对小一些。当各层的折射率一定时，对称和非对称结构的最佳波导层厚度差不多，限制因子与波导层厚度的关系也类似。在最佳波导层厚度附近的区域，ΓＴＭ／ΓＴＥ比值变化对波导层厚比较敏感，这点可以用于偏振无关放大器的设计中，因为我们能够通过调节波导层厚度改变ＴＭ／ＴＥ模式增益比。
In this paper, the optical confinement factors of mixed strained quantum well structures (both tensile and quantum strain wells) are discussed theoretically. As the barrier width is small, the amount of change is not large, the impact of optical restrictions is relatively small. When the refractive index of each layer is constant, the optimal waveguiding layer thickness of the symmetric and asymmetric structures is almost the same, and the relationship between the limiting factor and the waveguide layer thickness is also similar. The variation of the ΓTM / ΓTE ratio is sensitive to the waveguide layer thickness in the area near the optimum waveguide layer thickness, which can be used in the design of polarization-independent amplifiers because we can vary the TM / TE mode gain ratio by adjusting the thickness of the waveguide layer.