Patent ID: 6728283
Filing Date: 2004-04-27
Classification: B82Y,G02B,H01S

Abstract:
A semiconductor laser, comprising:an active layer constituted of a first semiconductor layer and second semiconductor layers, the second semiconductor layers being brought into contact with said first semiconductor layer and being arranged on top and bottom of said first semiconductor layer; and barrier layers which are brought into contact with said active layer and are arranged on top and bottom of said active layer, wherein said active layer and said barrier layers are formed over a GaAs substrate, wherein said first semiconductor layer is a GaAsSb layer, and said second semiconductor layers are compound semiconductor layers selected from the group consisting of GaInAs layers and GaInNAs layers, wherein said first semiconductor layer is thicker than 3 nm and no thicker than 8 nm, wherein said first semiconductor layer is thinner than said second semiconductor layers, and wherein the semiconductor laser has an emission wavelength band equal to or greater than 1.3 &mgr;m.