SEMICONDUCTOR OPTICAL RESONATOR, SEMICONDUCTOR OPTICAL ELEMENT, AND OPTICAL COMMUNICATION MODULE

PROBLEM TO BE SOLVED: To prevent ununiformity in emission wavelength at portions of different optical axis direction.SOLUTION: A resonator part 4 includes a waveguide containing two or more regions having a different effective refractive index in optical axis direction, and a diffraction lattice 5 formed along the optical axis direction of the waveguide. A pitch of the diffraction lattice 5 formed to a region in which effective refractive index of a waveguide is large is set smaller than a pitch of the diffraction lattice 5 formed to a region in which effective refractive index of the waveguide is small. 【課題】光軸方向の異なる部位での発光波長の不均一を防止する。【解決手段】共振器部４は、光軸方向で実効屈折率が異なる２以上の領域を含む導波路と、導波路の光軸方向に沿って形成される回折格子５と、を有し、導波路の実効屈折率が大きい領域に対して形成される回折格子５のピッチを、導波路の実効屈折率が小さい領域に対して形成される回折格子５のピッチよりも小さくした。【選択図】図２