Fiber optic cables not only offer a high data throughput, they are also immune to eavesdropping and interference. Fibre optic cables can therefore easily be laid in parallel with other supply lines - electromagnetic interference does not occur. The disadvantage of fiber optic cabling, however, is the cost. They are more expensive than copper cables but have a considerably lower attenuation and are therefore suitable for long distances. But even for short distances in LANs, optical fibers are increasingly being installed nowadays. Especially for the measurement and documentation of optical networks, the necessary measurement technology must be of high quality and future-proof.