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Multigigabit Clock Recovery
Mário José Neves de Lima; José R. Ferreira da RochaThis dissertation purpose is the design and implementation of circuits to be used in the synchronization of high bit rate digital signals. At those rates clock recovery is done using an opne-loop structure, since the technology needed for developing closed-loop synchronisers is still not completely mature. (...)Keywords: optical communications; clock recovery; multigigabit; jitter; Gallium Arsenide monolit...
Optimization of dense multi-wavelength optical communication systems (WDM)
António Luís Jesus Teixeira; José R. Ferreira da RochaIn this work, two main ideas were observed: The linear propagation, typically NRZ and the nonlinear propagation, typically RZ. However distinct, and normally taken in the academic and company environments as concurrent, they start to mix joining the benefits and the techniques to create more robust systems. (...)keywords: WDM; Wavelength division multiplexing; solitons; DST; Dispersion supported transmissi...
Optimisation of preamplified optical receivers for very high bit rates
Paulo Miguel N. Pereira Monteiro; José R. Ferreira da RochaThis thesis is concerned with design, optimisation and realisation of optical preamplified receivers appropriate for high capacity optical telecommunication systems. A range of post-detection filters appropriate for multigigabit return-to-zero (RZ) signalling inherent in high speed optical communication systems were investigated. (...)keywords: optical receivers; optical systems; optical solitons; signal p...
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