| 摘要 |
PURPOSE:To enable outputting light with multi-wavelengths by means of one laser element by a method wherein a plurality of laser oscillating regions are formed on a light waveguide, and light from these laser oscillating regions is extracted from the light waveguide. CONSTITUTION:An N-GaAlAs layer 2, an N-GaAlAs layer 3 and an N-GaAlAs layer 4 are grown on an N type GaAs substrate 1. A P-GaAs layer 5 and a P- GaAlAs layer 6 functioning as active layers are separately formed on the layer 4, and a P-GaAlAs layer 7 and a P-GaAs layer 8 are each made up on these layers 5, 6 successively. Oscillating light at the active layers 5 or 6 can be extracted to the outside from a waveguide 3 for output by directional coupling according to such constitution. Since the layers 5, 6 consist of semiconductors having different band gaps respectively lights with different wavelengths can be oscillated, and the two layers contribute largely to the performance of the photo multiplex communications. |
