Optical Frequency Conversion: Novel Integrated Devices and Applications
Prof. Roberto Morandotti, University of Quebec, Montreal
DEI - Edificio 24, aula alfa
19 Dicembre 2011
Until today, the world of electronics has always been an inexhaustible source of resources to satisfy the continuous request for larger bandwidths in communication systems. Unfortunately the bit rate limit of electronic devices (around 50 Gb/s) will soon be reached, and scientists and engineers are now struggling for alternative solutions. Among them, all-optical signal processing appears to be one of the most viable approaches since it brings the promise to drastically increase the performances of transmission networks and, at the same time, to keep the associated costs low. However, in order to fulfill the goal of realizing all-optical agile communications systems and improve overall all-optical devices performances, it is mandatory to efficiently perform fundamental network operations such as optical switching, data storage, ultrafast modulation, etc. In particular, wavelength conversion is required to realize wavelength division multiplexing systems capable of substantially increasing the bit rate by channeling the information on different frequency carriers. Recently ultra-low CW pump power (5mW) wavelength conversion based on Four Wave Mixing (FWM) has been reported in silicon micro-ring resonators. Nevertheless, it is of paramount importance to study other material systems, since silicon is well known to suffer from two-photon absorption (TPA) that in turn induces free carrier losses and may affect the performance of silicon based devices. In this work we first demonstrated, by means of C-MOS compatible high index glass based micro ring resonators, efficient wavelength conversion by FWM using ultra-low continuous-wave pump power.
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Roberto Morandotti received a MSc in Physics from the University of Genova in 1993 and a PhD in Electronic Engineering at the University of Glasgow (Scotland) in 1999, where his research activity focused on the study of the linear and nonlinear properties of optical discrete systems.
In June 2003 he joined INRS-EMT (University of Quebec) in Montreal , where he is a Full Professor since 2008.
His research interests mainly deal with the linear and nonlinear properties of periodic structures, both in III-V semiconductors and silica, as well as with optics at unusual wavelengths, including THz.
Prof. Morandotti is author and coauthor of more than 400 papers in scientific journals and conferences, and gave some 100 invited and keynote talks in various international conferences. He is currently serving as a subcommittee chair/technical committee member for several OSA, LEOS and SPIE meetings. He is an E.W.R. Steacie Memorial Fellow 2011, a Fellow of the Optical Society of America, a Fellow of the Institute of Nanotechnology, and a Full Member of SigmaXi.
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