Concatenated filtering is an important impairment in high-spectral density transmission
systems enabled by flexible-grid reconfigurable optical add-drop multiplexers (ROADMs). In …

As modern optical networks continue evolving toward higher symbol rates while supporting
tight channel spacing, penalties due to optical filtering incurred by transmission through …

In this work, we assess the impact of several physical layer impairments (PLIs) on the
performance of optical networks based on colorless, directionless and contentionless …

The performance implications of passband impairments and bandwidth narrowing caused
by the cascading of optical filters are investigated using a 100 Gb/s dual polarization …

Explicit expressions for the dependence of signal-to-noise ratio on the optical filter
bandwidth and its slope have been obtained. The resulting expressions were confirmed …

Using real-time transceivers with symbol rates up to 72 GBd, we investigate the impact of
ROADM filtering on optimum symbol rate and fractional m-QAM modulation required to …

This thesis describes novel contributions in the field of physical layer aware optical
networks. IP traffic increase and revenue compression in the Telecom industry is putting a lot …

In this work, we consider the impact of spectral narrowing of 43Gb/s NRZ‐DPSK signals on
the system performance. NRZ‐DPSK signals passing through reconfigurable optical …

Superchannels have been proposed as a cost-effective solution to cope with the future data
capacity demand in long-haul transport networks. However, in superchannels, the spectrum …

As redes óticas de transporte atuais estão a aproximar-se do seu limite de capacidade
devido às novas aplicações e serviços que requerem uma maior quantidade de recursos de …