Antonio Díez is a Professor at the Department of Applied Physics, University of Valencia, Spain. He is a member of the Laboratory of Fiber Optics. He received his Ph.D. in physics in 1998 from the University of Valencia, Spain, where he was involved in the design and fabrication of optical fiber sensors. While doing his Ph.D., he did several stays at the Optoelectronic Research Centre, Southampton, U.K. In 1999, he joined the Optoelectronics Research Group at the University of Bath, U.K, for two years, where he was engaged in research on acousto-optic effects in standard fibers and on photonic crystal fibers. His current research interests include photonic crystal fibers, fiber lasers, optical fiber devices for signal processing, and optical sensors. He is a co-author of over 120 papers in peer-reviewed scientific journals on waveguide propagation and optical fiber technology, and he holds 7 patents.