SEMICONDUCTOR OPTICAL ELEMENT AND OPTICAL COMMUNICATION MODULE

摘要

PROBLEM TO BE SOLVED: To suppress occurrence of hole burning in axial direction at a phase shift part of a diffraction lattice.SOLUTION: A semiconductor optical element L1 includes a diffraction lattice layer containing a diffraction lattice 1 and a phase shift part 2, and an optical waveguide layer containing an active layer 3 having a gain to oscillation wavelength and an optical waveguide region 4 having no gain to the oscillation wavelength. The optical waveguide region 4 is provided at least on the lower side of the phase shift part 2.