Defense of the DOCTORAL thesis of Róbert HORVÁTH, for the University Grenoble Alpes , speciality "OPTICS and RADIOFREQUENCIES", entitled:
3 Parvis Louis Néel
«Sampling and demodulation of RF signals modulated by multi-Gbit/s data streams»
Friday, June 14, 2019 at 14:00
LesFiber optics, photonic and RF technologies will be at the core of next generation communication networks, while the carrier frequencies are moving into the millimetre wave range (30GHz – 300 GHz). Despite the use of high carrier frequencies, these transmission systems still require the detection and downconversion of modulated data-streams into the baseband for signal processing.
In this thesis we are proposing an optoelectronic heterodyne mixer system, based on a single device, for photonic assisted processing of data transmitted in a millimetre wave telecommunication link. The proposed scheme is a feasible solution for mixers at the receiver side of a Radio-over-Fibre network wireless link. The system is working in the 1.5 μm wavelength range and taking advantage of the ultrafast properties of an InGaAs photoconductive switch, in combination with a semiconductor mode-locked laser.
The characterization of the switch showed an ultrashort photocarrier lifetime of 1.2 ps, which ensures its high bandwidth and ability to work in the millimetre wave range.
System characterisations obtained a relatively flat response both in the electrical and optical domains up to 164 GHz. We demonstrate the optoelectronic mixer system performance through the downconversion and demodulation of a 2 Gbit/s QPSK modulated data-stream.
Ultrafast photoswitches are also potential candidates as samplers in Analog-to-Digital Converters. Finally, an experimental study is given to show the InGaAs photoswitch potential in such devices.
Jury members :
Jean-François ROUX - Supervisor
Anne-Laure BILLABERT - Reviewer
Guillaume DUCOURNAU - Reviewer
Jean-Emmanuel BROQUIN - Examiner
Frédéric VAN DIJK - Examiner
Cyril RENAUD - Examiner
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Thesis prepared in the laboratory : UMR 5130 - Institut de Microélectronique, Electromagnétisme et Photonique -Laboratoire d'hyperfréquences et de caractérisation , supervised by Jean-François ROUX, supervisor and Béatrice CABON Co-supervisor.