The bachelor thesis deals with the issue of optical fiber joining. The theoretical part describes the methods of optical fiber splicing, protection of optical splices and possible errors that affect the quality of the optical splice. Also described are methods for measuring important optical joint parameters, such as attenuation or reflection attenuation. An important part of the work is a description of the restoration of primary protection of spliced fiber. The theory is further applied in the practical part, where the attenuation of the optical links was measured using the mentioned methods. It also includes a comparison of the mechanical strength of optical splice and a joint formed by optical connectors. This knowledge is then applied ...