Szczerba Krzysztof, Westbergh Petter, Karout Johnny, Gustavsson Johan, Haglund Åsa, Karlsson Magnus, Andrekson Peter, Agrell Erik, Larsson Anders
Department of Microtechnology and Nanoscience, Chalmers University of Technology, 412-96 Gothenburg, Sweden.
Opt Express. 2011 Dec 12;19(26):B203-8. doi: 10.1364/OE.19.00B203.
We present high speed real time, error free 4-PAM transmission for short range optical links based on a VCSEL operating at 850 nm, a multimode fibre and a simple intensity detector. Transmission speeds of 25 Gbps and 30 Gbps are demonstrated, and the maximum fibre reaches were 300 m and 200 m, respectively. The 4-PAM is also compared with OOK transmission at 25 Gbps, and we find that at this bit rate 4-PAM increases the error free transmission distance in the multimode fibre by 100 m, compared to OOK.
