OPTICAL SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide: an optical semiconductor device which enables the reduction in carrier diffusion into an active layer; and a method for manufacturing such an optical semiconductor device.SOLUTION: An optical semiconductor device 1A comprises: a semiconductor substrate 11 as an n-type clad layer; an active layer 12 formed on the semiconductor substrate 11; a p-type clad layer 14 formed on the active layer 12; a pair of block regions 16a and 16b arrayed in a direction crossing a laminating direction, between which the p-type clad layer 14 is located; and a p-type clad layer 17 formed on the p-type clad layer 14 and the pair of block regions 16a and 16b. In the p-type clad layer 14, the carrier concentration is higher than the carrier concentration in the p-type clad layer 17.SELECTED DRAWING: Figure 1