| 摘要 |
A semiconductor optical amplifier is provided having polarization independent optical amplification characteristics and a flat gain spectrum over a wide wavelength region. In the semiconductor optical amplifier including a multi-quantum well active layer formed of well layers and barrier layers alternately laminated to each other on an InP substrate, the well layers and the barrier layers each have a tensile strain, and the tensile strain of each of the barrier layers is larger than the tensile strain of each of the well layers.
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