PhD Defense of Fatima BARRAMI

A possible approach to maximize the data rate per wavelength, is to employ the high spectral efficiency discrete multitone (DMT) modulation. The work presented in this thesis mainly focuses on optimizing the power consumption and cost of DMT, that are the major obstacles to its market development.
Within this context, we have first developed novel techniques permitting to discard the use of Hermitian symmetry in DMT modulations, thus significantly reducing the power consumption and the system cost. We have next proposed an asymmetric linear companding algorithm permitting to reduce the optical power of conventional DCO-OFDM modulation with a moderate complexity.
A new VCSEL behavioural model based on the use of the VCSEL quasi-static characteristic was also developed to accurately evaluate the VCSEL impact on DMT modulations.
Finally, we have built an experimental system to experimentally validate our proposed techniques.  Several simulations and measurement results are then provided.

Members of  jury :
Emil NOVAKOV - Supervisor
Yannis LE GUENNEC - Co Supervisor
Pierre BUSSON - Co Supervisor
Christelle AUPETIT - Rapporteur
Mohammad-Ali KHALIGUI - Rapporteur
Bruno FRACASSO - Examiner