Patent ID: 8604496

Claim:
An optical semiconductor device, comprising: an n-type semiconductor layer; a p-type semiconductor layer; and a functional part provided between the n-type semiconductor layer and the p-type semiconductor layer, the functional part including a plurality of active layers stacked in a direction from the n-type semiconductor layer toward the p-type semiconductor layer, and each of at least two of the active layers including: a multilayer stacked body including a plurality of thick film layers and a plurality of thin film layers alternately stacked in the direction, a thickness of the thin film layers being not more than a thickness of the thick film layers, an n-side barrier layer provided between the multilayer stacked body and the p-type semiconductor layer, a well layer; and a p-side barrier layer provided between the well layer and the p-type semiconductor layer, wherein the well layer is provided between the n-side barrier layer and the p-side barrier layer.