Pontus Johannisson received his Ph.D. degree from Chalmers University of Technology, Göteborg, Sweden, in 2006. His thesis was focused on nonlinear intrachannel signal impairments in optical fiber communications systems. In 2006, he joined the research institute IMEGO in Göteborg, Sweden, where he worked with digital signal processing for inertial navigation with MEMS-based accelerometers and gyroscopes. In 2009, he joined the Photonics Laboratory, Chalmers University of Technology, where he currently holds a position as Assistant Professor. His research interests include nonlinear effects in optical fibers and digital signal processing in coherent optical receivers.