A laser diode module for optical communication is disclosed and includes a plurality of leads, a housing having a vertical wall, a heat sink disposed on the housing, a superlattice microcooler disposed on the heat sink, a laser diode disposed on one side of the superlattice microcooler, a photo diode to convert the received light emitted from the laser diode into current, and a light condensing unit disposed on one side of the heat sink to condense the laser beams emitted from the laser diode.