Devices, units and assemblies for the data, communication and information transmission; measuring, test, control, protection devices and assemblies thereof; distributor and connector devices for light waveguides, namely removable and/or stationary connector devices and/or partitioning devices such as couplers, splitters; connector devices for light waveguides with opto-electrical components, connector devices for light waveguids with opaque design elements, combinations of light-conducting and opaque materials; termination devices and quick-terminate devices for light waveguides, termination devices of light waveguides to an optical network; light waveguides with light-amplifying properties, amplifier devices