Patent ID: 7782919

Claim:
A buried semiconductor laser, comprising: an n-type indium phosphide (InP) substrate; an active layer disposed on said n-type InP substrate; block layers bilaterally provided over said active layer and said block layers; a clad layer provided over said active layer and said block layers; and a p-type gallium indium arsenide (InGaAs) contact layer provided over said clad layer, wherein a predetermined portion of said p-type InGaAs contact layer has a compressive strain equal to or less than a critical strain, wherein said predetermined portion of p-type InGaAs contact layer includes a flat portion remote from a portion thereof immediately above said active layer and an inclined portion immediately above said active layer, said flat portion of the p-type InGaAs contact layer has a compressive strain that is equal to or less than the critical strain, and said inclined portion of the p-type InGaAs contact layer has a tensile strain that is equal to or less than the critical strain.