Optical sensing device and optical sensing system thereof comprising light emitting device and light receiving device completely sandwiched by the topmost surface and bottommost surface of a carrier body with different vertically separated distances

An optical sensing device, comprising:

• a carrier body having a topmost surface and a bottommost surface;
• a first light-emitting device disposed on the carrier body, and having a light-emitting surface;
• and
• a light-receiving device comprising a group III-V semiconductor material, disposed on the carrier body, and having a light-receiving surface;
• wherein the first light-emitting device and the light-receiving device are completely located within a space sandwiched by the topmost surface and the bottommost surface, the light-emitting surface is vertically separated from the topmost surface by a first distance H1, the light-receiving surface is vertically separated from the topmost surface by a second distance H2, and H1 is different from H2.