Daniel Fonseca
Instituto Superior Técnico
74 Papers
365 Citations
Daniel Fonseca is an academic researcher from Instituto Superior Técnico. The author has contributed to research in topics: Compatible sideband transmission & Sideband. The author has an hindex of 12, co-authored 74 publications. Previous affiliations of Daniel Fonseca include Nokia Networks & Siemens.
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Papers
Design of Few-Mode Fibers With M-modes and Low Differential Mode Delay
TL;DR: In this article, the authors investigated the design of few-mode fibers (FMFs) guiding 2 to 12 linearly polarized (LP) modes with low differential mode delay (DMD) over the C-band, suitable for longhaul transmission.
Planning fixed to flexgrid gradual migration: drivers and open issues
Marc Ruiz,Luis Velasco,Andrew Lord,Daniel Fonseca,Michal Pioro,Roland Wessäly,Juan Fernandez-Palacios +6 more
TL;DR: The migration process where flexgrid is deployed in the network progressively is studied, and the main drivers and open issues induced by its deployment are reviewed.
Highly Linear Integrated Optical Transmitter for Subcarrier Multiplexed Systems
TL;DR: In this paper, an integrated dual Mach-Zehnder modulator (MZM) is utilized to combine an optical carrier suppressed signal with the optical carrier, which enables more than 10dB improvement in the carrier-to-interference ratio compared to a quadrature biased MZM.
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All-Optical Burst-Mode Power Equalizer Based on Cascaded SOAs for 10-Gb/s EPONs
Silvia Pato,Rui Meleiro,Daniel Fonseca,Paulo André,Paulo P. Monteiro,Henrique J. A. da Silva +5 more
TL;DR: In this article, a power equalization scheme based on cascaded semiconductor optical amplifiers is proposed for 10-Gb/s passive optical networks with uneven topology, which enables a 16dB reduction of the receiver dynamic range.
36
Design of Few-Mode Fibers With Arbitrary and Flattened Differential Mode Delay
TL;DR: In this paper, the authors proposed the use of a refractive index profile with a graded core and a cladding trench for the design of few-mode fibers, aiming an arbitrary differential mode delay (DMD) flattened over the C+L band.