1. An optoelectronic module, comprising: a micro-optical substrate; a beam transmitter, comprising a laser die mounted on the micro-optical substrate and configured to emit at least one laser beam along a beam axis; a receiver, comprising a detector die mounted on the micro-optical substrate and configured to sense light received by the module along a collection axis of the receiver; and beam-combining optics, which are configured to direct the laser beam and the received light so that the beam axis is aligned with the collection axis outside the module.