Abstract: The optoelectronic mechanical assembly can have an integrated light source and couple a non-rotary light outlet thereof directly into a tip of a freely rotatable optical fiber. The assembly includes a fixable structure which can house a light source, and a rotary structure which receives the optical fiber and which is mounted to the fixable structure by way of at least one bearing, in a manner to maintain the optical alignment of the optical fiber with the non-rotary outlet. If more than one light source is used, they can be combined into the common outlet by a beam combiner.