| 摘要 |
A semiconductor optical amplifier wherein poalization independent gain, high saturation input light intensity, and high saturation gain are obtained. The semiconductor optical amplifier of the present invention comprises a 1 x 1 multi mode interference (MMI) light waveguide region and a couple of single mode waveguide regions, each of which is connected with each end of the multi mode region. The length of the multi mode waveguide region is about 340 mu m and the length of the single mode waveguide regions is about 20 mu m. The width of the multi mode waveguide region is about 12 mu m, while the widths of the single mode waveguide regions 2, 3 are about 1 mu m. <IMAGE> |
