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About

I was born in Viana do Castelo, Portugal, in 1996. I came to Porto in 2014 to join the Degree in Electrical and Computer Engineering in Instituto Superior de Engenharia do Porto (ISEP). In 2017, I joined the Master in Electrical and Computer Engineering - Specialization in Telecommunications in the same institution.

My master thesis was carried out at INESC TEC as a trainee researcher. Currently, I am a research fellow with a research grant from the Optical and Electronic Technologies (OET) group of the Centre for Telecommunications and Multimedia (CTM).

My main interests include high-speed optical and wireless communications, underwater communications, electronic circuits, optoelectronic devices, and microelectronics.

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Publications

2020

LASER diode-based transmitter module for optical wireless communications

Authors
Araujo, JH; Kraemer, R; Santos, HM; Pereira, F; Salgado, HM; Pessoa, LM;

Publication
2020 12th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2020

Abstract
In this paper, we present the design of an analog transmitter based on a blue LD targeting optical wireless communications, suitable for OFDM signals. The approach relies on a thorough characterization of the individual components of the module, whence a detailed circuit model is obtained to design an impedance matching circuit for improved performance, prior to fabrication. The impedance matching is based on non-uniform transmission lines and works well over a wide frequency range (100 MHz to 2 GHz). The results are experimentally validated by the transmitter response exhibiting an increased 6 dB bandwidth limit and 1 GHz bandwidth improvement. © 2020 IEEE.

2020

5.36 Gbit/s OFDM optical wireless communication link over the underwater channel

Authors
Araujo, JH; Kraemer, R; Tavares, JS; Pereira, F; Salgado, HM; Pessoa, LM;

Publication
2020 12th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2020

Abstract
An OFDM transmission system is reported based on a directly modulated blue LASER diode, for high bit rate under-water optical communication applications. The 256 subcarriers 16-QAM signal is transmitted over a total distance of 2.4 m underwater with an EVM lower than -28.5 dB for a 250 MHz bandwidth and -16.5 dB for a 2 GHz bandwidth, the BER being lower than the forward error corrector limit. At the maximum bandwidth of 2 GHz a transmission rate of 5.36 Gbit/s is achieved. © 2020 IEEE.