More particularly, the invention relates to light emitting device assembly that utilizes an optical fiber, by a reflective cover of the network structure surrounding the same, and an optical fiber that can be side-emitting, the present invention diverges light more efficiently then, the present invention relates to a light emitting assembly visible more easily from the outside thereby. With such an arrangement, it is reflected once again the light emanating from the optical fiber via a reflection cover of network structure, it is possible to recognize brighter the light emitting device assembly from the outside. Furthermore, the light-emitting assembly utilizing optical fibers, these will be able to prevent various accidents which may be used in a variety of applications, due to the nighttime activity thereby.