The dual polarization dual wavelength lasers with active layer of mixed strained layer quantum well are reported in this paper. These lasers are compared with lasers with bulk active layer

lattice matched quantum well active layer

and compressively strained quantum well active layer.These lasers can operate with both TE and TM polarization lasing at the same time

and the two polarization modes have different lasing wavelengths. Combining other people’s experimental results

it is concluded that in the mixed strained layer quantum well structure

we can’t determine the band filling effect in the two kinds of strained layer quantum wells from the peak wavelength difference of the two polarized spontaneous emission spectra.