Given a component comprising at least one active area formed on a substrate and designed to be coupled to a light guide, a support is used, at least one hole is formed in the support starting from one face of this support, this hole being designed to receive one end of the guide, the substrate is fixed to the other face of the support by forming the hole facing the active area if the active area has already been formed, and otherwise it is formed on the substrate facing the hole and the end of the guide is placed in the hole. The optical system is obtained by optically coupling two devices thus obtained.