A coupling system includes a first connecting unit and a second connecting unit adapted to be connected to each other. Each of the first connecting unit and a second connecting unit includes an enclosure with a substantial even mating surface and a pair of lens module. Each lens module includes a lens enclosed within a magnet, and the magnets of the coupled lens modules have opposite magnet poles around the corresponding mating surfaces. The pair of lens modules are further equipped with a transmitting chip and a receiving chip in aligned with the corresponding lens, respectively.