An optical module includes a horizontal base plate, a lens mounted on the base plate, a fiber sleeve, and a board lock. The lens has a front end face and a rear end face corresponding to the front end face. The fiber sleeve is mated with the rear end face of the lens. The fiber sleeve has a front surface and a rear surface. The board lock is mounted at a rear of the fiber sleeve. The board lock has a strain relief base and a cover locking to the strain relief base. The strain relief base has a front wall and a pogo pin forwardly extending beyond the front wall. The fiber sleeve defines a receiving hole in the rear surface for fixing the pogo pin. The cover is retained to the base plate.