Multi-wavelength semiconductor laser device

A multi-wavelength semiconductor laser device, comprising:

• a substrate having a top surface divided into a first region and a second region;
• a high-output LD including a first conductivity-type clad layer, an active layer, and a second conductivity-type clad layer including an upper portion having a first ridge structure, sequentially formed on the first region of the substrate;
• and
• a low-output LD including a first conductivity-type clad layer, an active layer, and a second conductivity-type clad layer including an upper portion having a second ridge structure, sequentially formed on the second region of the substrate,
• wherein the first and second ridge structures are formed in such a manner that they are extended to both ends opposed to each other, the first ridge structure is bent at two or more bending positions, and the second ridge structure is rectilinear;
• and
• wherein the semiconductor laser device further comprises a slit-shaped mirror formed in the first conductivity-type clad layer, the active layer and the second conductivity-type clad layer at the outer side of the bent parts in the high-output LD.