A composite material is provided that includes laminated layers, an optical fiber, and a demodulator. The LEDs are attached to a metallic multi-film support having sandwich-like insulating intermediate layers and having at least a step-like structure with at least one step. A cable connection socket is on the riser card a first distance away from the connector, and a plurality of traces in a signal layer of the riser card run between the cable connection socket and the connector. In use, different components show differential migration along the feed channel so they can be separated into different subsidiary channels at the branch point. Some embodiments provide a system that uses software, embedded hardware or firmware to carry out the above-described method.