In the last years more and more fibre optic transmission systems were used in the field of automation. This is because of the decisive advantages as - high protection against electromagnetic interference, - ground loop immunity between transmitter and receiver parts, - data rates which are independent of transmission distances. The present state of fibre optic transmission systems in Germany is shown in some examples of mainly installed point-to-point-links in short, medium and long distances, as well as bussystems. The situation of standardization activities and guideline works in Germany is shortly described. Finally, some future aspects and trends are given.