An optical rotary joint includes a first collimator arrangement for coupling on first light-waveguides, and a second collimator arrangement for coupling on second light-waveguides, with the second collimator arrangement being supported to be rotatable relative to the first collimator arrangement about a rotation axis. The outer casing has a power terminal passage formed penetratingly in the outer casing. The voltage switching control circuit generates first and second voltage switching signals in accordance with at least one voltage switching signal. The process for producing such a thin film transistor is also provided. The intercepted network traffic is provided to a receiving application.