" Low-complexity direct detection optical OFDM systems for high data rate communications."
Melle Fatima BARRAMI
Thursday, April 9, 2015 at 10:00
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
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Thesis preparedin the laboratory IMEP-LaHC supervised by Emil NOVAKOV