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About

I am a PhD student at the MAP-Tele Doctoral Programme in Telecommunications and a researcher at INESC TEC, in the CTM group. My main interests include optical fiber communication systems, specifically nonlinearity mitigation techniques and multimode fibers. My thesis proposal is entitled "Phase-Conjugated Twin Waves for Space-Division Multiplexed Systems", where I proposed to study spectrally efficient PCTW techniques to overcome the spectral efficiency loss inherent to the PCTW technique. 

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Publications

2019

Resonant tunneling diode photodetectors for optical communications

Authors
Watson, S; Zhang, WK; Tavares, J; Figueiredo, J; Cantu, H; Wang, J; Wasige, E; Salgado, H; Pessoa, L; Kelly, A;

Publication
Microwave and Optical Technology Letters

Abstract
Optical modulation characteristics of resonant tunneling diode photodetectors (RTD-PD) are investigated. Intensity modulated light excites the RTD-PDs to conduct data experiments. Simple and complex data patterns are used with results showing data rates up to 80 and 200 Mbit/s, respectively. This is the first demonstration of complex modulation using resonant tunneling diodes. © 2019 The Authors. Microwave and Optical Technology Letters published by Wiley Periodicals, Inc.

2019

Optical direct intensity modulation of a 79GHz resonant tunneling diode-photodetector oscillator

Authors
Zhang, WK; Watson, S; Figueiredo, J; Wang, J; Cantu, HI; Tavares, J; Pessoa, L; Al Khalidi, A; Salgado, H; Wasige, E; Kelly, AE;

Publication
Optics Express

Abstract

2018

Experimental Evaluation of Resonant Tunnelling Diode Oscillators Employing Advanced Modulation Formats

Authors
Tavares, JS; Pessoa, LM; Salgado, HM;

Publication
International Conference on Transparent Optical Networks

Abstract
The performance of Resonant Tunnelling Diode (RTD) oscillators with an optical window is evaluated experimentally, in the transmission of advanced modulation formats using electrical and optical modulation, for the first time. Additionally, the impact of phase noise in the transmission performance is also assessed. © 2018 IEEE.

2017

Analysis of resonant tunnelling diode oscillators under optical modulation

Authors
Tavares, JS; Pessoa, LM; Figueiredo, JML; Salgado, HM;

Publication
International Conference on Transparent Optical Networks

Abstract
In this paper, we investigate the optical modulation characteristics of a resonant tunnelling diode (RTD) oscillator. This preliminary work on the first RTD-PD oscillators with an optical window available from the iBROW project demonstrate that this device can effectively be used to accomplish amplitude and frequency modulation with light injection. © 2017 IEEE.

2017

Nonlinear Compensation Assessment in Few-Mode Fibers via Phase-Conjugated Twin Waves

Authors
Tavares, JS; Pessoa, LM; Salgado, HM;

Publication
JOURNAL OF LIGHTWAVE TECHNOLOGY

Abstract
In this paper, we further explore the concept of phase-conjugated twin waves (PCTW) for nonlinear cancellation in space-division multiplexed (SDM) systems. Previously, we demonstrated that the PCTW technique can successfully provide nonlinear cancellation in SDM systems. In this paper, we investigate the cases where two and four spatial modes are copropagating in a multimode fiber, considering three link lengths (1000, 3200, and 8000 km). Weak-and strong-coupling regimes are also evaluated. Our numerical simulation results show an average performance improvement > 10 dB after a 1000 km transmission link.