Juuso T. Olkkonen received his M.Sc. and Ph.D. degrees in physics from the University of Oulu, Finland, in 2002 and 2010, respectively. During the years 2002-2004 he was a visiting researcher in Optical Sciences Center at the University of Arizona. He is currently working in multidisciplinary projects at VTT Technical research centre of Finland. His current research interests in digital signal processing include discrete wavelet transform algorithms, B-spline filters, fractional time-shift and Hilbert transform operators, novel sampling and reconstruction techniques for ultra wideband and optical pulse waveforms. He is also very active in other research fields related to micro- and nanophotonics, paper-based microfluidics, electrical biosensors and electromagnetic modeling. He has authored and co-authored more than 30 reviewed journal articles, two book chapters and 13 international reviewed conference papers.