2011
Autores
Reis, C; Andre, P; Dionisio, R; Neto, B; Teixeira, A; Maziotis, A; Kouloumentas, C; Stamatiadis, C; Bougioukos, M; Avramopoulos, H; Calabretta, N; Dorren, HJS;
Publicação
ICENCO'2010 - 2010 International Computer Engineering Conference: Expanding Information Society Frontiers
Abstract
We experimentally demonstrate the accuracy of an all-optical S-R latch and an optical S-R flip-flop based on hybrid integrated Mach-Zehnder Interferometers, with Semiconductor Optical Amplifier in each arm (MZI-SOA). The performance of both bistable devices will be studied and compared in terms of extinction ratio and switching times. © 2011 IEEE.
2011
Autores
Dionisio, RP; Parca, G; Reis, C; Teixeira, AL;
Publicação
ELECTRONICS LETTERS
Abstract
A methodology for achieving the best-fit set of parameters for a Mach-Zehnder interferometer with a semiconductor optical amplifier (MZI-SOA) static model is proposed. A multi-objective genetic algorithm is exploited and the quality of the approach is validated by applying it in an existing sample. Optimisation of performance and determination of operational limits are enabled by the proposed methodology and good agreement was obtained between simulated and practical results.
2011
Autores
Dionisio, R; Marques, P; Rodriguez, J;
Publicação
2011 Future Network and Mobile Summit, FutureNetw 2011
Abstract
For the characterization of TV White Spaces (TVWS), an extensive simulation of the impact of interfering signals was undertaken in a generalized scenario. The simulation for these investigations was derived from a Monte Carlo methodology using SEAMCAT, and the results include the computation of TVWS maps as it can be done with the access to a geo-location database, or based on autonomous sensing only. Geo-location database approach is shown to utilize TVWS spectrum more efficiently. The impact of Professional Wireless Microphone Systems (PWMS) devices on the availability of TVWS is also analyzed and imposes additional limitations of the maximum power emitted by secondary spectrum users. © 2011 IIMC.
2011
Autores
Parca, G; Dionisio, R; Reis, C; Betti, S; Beleffi, GT; Teixeira, A;
Publicação
2010 12TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON)
Abstract
The characteristics of MZI-SOA are affected by its internal design yields and asymmetries, leading to an unbalanced power distribution at the output arms and difficult or non optimum biasing. Therefore, we propose an experimental methodology and model for MZI-SOA structures taking into account internal asymmetries as well as the internal SOA behaviour under different current both as what regards amplitude and phase.
2011
Autores
Neto, B; Klingler, A; Reis, C; Dionisio, RP; Nogueira, RN; Teixeira, ALJ; Andre, PS;
Publicação
OPTICS COMMUNICATIONS
Abstract
In this paper, we propose a method to mitigate the temporal power transients arising from Erbium doped fiber amplifiers (EDFAs) on packeted/bursty scenario. The technique, applicable on hybrid WDM/TDM-PON for extended reach, is based on a low power clamping provided by a distributed feedback (DFB) laser and a fiber Bragg grating (FBG). An improvement in the data signal Q factor was achieved keeping the clamping control signal with a low power, accompanied by a maximum reduction in the gain excursion of 1.12 dB.
2011
Autores
Reis, C; Maziotis, A; Kouloumentas, C; Stamatiadis, C; Bougioukos, M; Calabretta, N; Andre, PS; Dionisio, R; Neto, B; Dorren, HJS; Avramopoulos, H; Teixeira, A;
Publicação
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
Abstract
We demonstrate, by using multiple Mach-Zehnder interferometer (MZI)-semiconductor optical amplifier structures, an all-optical synchronous D type flip-flop, with high-photonic integration capability. Experimental performance analysis shows its functional and performance feasibility and high-switching speeds were achieved. (C) 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1201-1204, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25998
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