Appliance and arrangement for optical signal transmission by means of optical waveguides

The invention relates to an appliance for optical signal transmission by means of optical waveguides in explosion-hazard areas, in particular in underground mining, having an optical transmitter (4), having an optical output interface (12) for connection of an optical waveguide transmission path (14) and having a device for limiting the light power (8). The invention also relates to an arrangement for bi-directional optical signal transmission. In order to provide an appliance for optical signal transmission as well as an arrangement for bi-directional optical signal transmission in explosion-hazard areas, complying with the requirements for intrinsically safe operation of the transmission medium when separating or decoupling the transmission medium, the device for limiting the light power (8) is a passive optical component (8) which is connected in the optical signal path between the optical transmitter (4) and the optical output interface (12).