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João J. O. Pires
Assistant
Professor
phone: (351) 21-8418476
fax: (351) 21-8418472 email: jpires@lisboa.lx.it.pt |
Research Interests
My present
research interests include mainly SDH and optical networks, as well as optical
switching. In the optical networking area relevant topics include design
and implementation of optical network elements (OADM) with protection
capabilities, study of the impact of physical layer limitations on network
design, and dimensioning of both planar and hierarchical optical networks. The
dimensioning of SDH networks and the interaction between SDH and optical
protection are also considered. In the context of optical switching the research effort has been
concentrated on establishing appropriate methodologies to analyse the performance of large
optical switches, as well as on designing switching networks under specified crosstalk and blocking constraints.
Selected
Publications
Journal articles
- J. J. O. Pires, M .O´Mahony, N. Parnis e E. Jones, “Scaling limitations in full-mesh WDM ring networks using arrayed-waveguide grating OADMs,” Electronics Letters, vol. 35, nº1, pp.73-75,1999.
- J. J. O. Pires, M. O´Mahony, “Photonic switch size limitations imposed by phase noise from semiconductor optical amplifiers,” Electronics Letters, vol. 31, nº18, pp. 1583-1584,1995.
- J. J. O. Pires, J. R. F. da Rocha, “Performance analysis of DPSK direct detection optical systems in the presence of interferometric intensity noise,” IEEE/OSA J. Lightwave Technoloy, vol.10, nº11, pp.1722-1730, 1992.
- J. J. O. Pires, J. R. F. da
Rocha, “Carrier recovery and filtering in optical BPSK
heterodyne systems disturbed by phase noise from external cavity semiconductor lasers,” IEE
Proc. J. Optoelectronics, vol. 138, nº4, pp. 248-292,1991.
- J. J. O. Pires, J. R. F. da Rocha, “Digital pulse
position modulation over optical fibres with avalanche photodiode
receivers,” IEE Proc. J. Optoelectronics, vol.
133, nº5, pp. 309-313,1986.
Conference Papers
- J. J. O. Pires, M .O´Mahony, N. Parnis and E. Jones, “Size limitations of a WDM ring network based on arrayed-waveguide grating OADMs,” Proc. Third Working Conference on Optical Network Design and Modeling (ONDM´99), pp. 71-79, Paris, France, February 1999.
- L. G. C. Cancela, J. J. O. Pires, “Multisource crosstalk as a function of channel frequency spacing in an 8x8 Benes optical switch,” Proc. SPIE Conference on All-Optical Networking: Architecture, Control and Management Issues, vol. 3531, pp. 328-336, Boston, USA, November 1998.
- J. J. O. Pires, M .O´Mahony, N. Parnis and E. Jones, “Crosstalk implications in full-mesh WDM ring networks using arrayed-waveguide grating OADMs,” Proc. 1998 European Conference on Optical Communications (ECOC´98), pp. 541-542, Madrid, Spain, September 1998.
- J. J. O. Pires, L. G. C. Cancela, ”Coherent multipath crosstalk in Benes and dilated Benes optical switches,” Proc. IEEE Laser Electro-Optics Society 1997 Annual Meeting, pp. 544-545, November 1997.
- J. J. O. Pires, M .O´Mahony, “Impact of multipath coherent crosstalk on the size of optical space switches,” Proc. First Optoelectronics and Communications Conference (OECC96), pp. 318-319, Chiba, Japan, July 1996.
- J. J. O. Pires, “Impact of the phase noise generated from semiconductor optical amplifiers on the size of optical space switches,” Proc. IEEE GLOBECOM´95, pp. 2108-2111, Singapoure, November 1995.
- P. A. C. Monteiro, J. J. O. Pires, “ Optically preamplified DPSK direct detection systems with post-detection filtering effects,” Proc. Conference on Broadband Networks: Strategies and Technologies, pp. 519-530, Amesterdam, Netherlands, April 1995.
- J. J. O. Pires, J. R. F. da Rocha, “Effect of phase-induced intensity noise on a DPSK direct detection systems,” Proc. Ninth Annual European Fibre Optic Communications and Local Area Networks Conference (EFOC/LAN), pp. 405-408, London, UK, 1991.
- J. J. O. Pires, J. R. F. da Rocha , ”Carrier recovery and filtering in optical BPSK systems using external cavity semiconductor lasers,” Proc. SPIE Coherent Lightwave Communications Conference, vol. 1372, pp. 118-127, San Jose, USA,1990.
- J. J. O. Pires, J. R. F. da
Rocha ,” Evaluation of filtering effects on optical BPSK systems using
external cavity semiconductor lasers,” Proc.
SBT/
IEEE International Telecommunication Symposium, pp. 21-25, Rio de Janeiro, Brasil 1990.
- J. J. O. Pires, J. R. F. da Rocha , ”Baseband filtering effects on optical BPSK systems using external cavity semiconductor lasers, “ Proc. IEEE/OSA Conference on Lasers and Electro-Optics, pp. 424, Anaheim, USA, 1990.
National Projects
(IT Lisboa)
- JNICT 2525- Optical switching in the Access Network (1996-1998): The work developed within this project included the study of the feasibility of an all-optical access network, analysis and performance evaluation of an optical ring network using optical add-and-drop nodes and characterization and measurement of different optical switches. A demonstrator based on an 2x4 optical switch, used to route both digital and analogue signals, was also developed.
- IT L02-Optical protection (1998-2000): A reconfigurable optical add-drop multiplexer appropriate for operation in a 2 fibre ring was developed within this project. The multiplexer has protection capabilities and could operate either in service mode, or protection mode. The switching between the nodes is done using four 2x2 optical switches. The supervisory system used to detect failures is based on pilot tones and can be applied for monitoring both digital and analogue signals. A control system for reconfiguration and a PC interface and visualization software were also developed.
Lectured Courses
- Telecommunication Systems I, Spring 2000.
- Modulation and Coding. Course given at ISCTE, Spring 2000.
- Telecommunication Networks, Spring 1999.
- Optical Communication Systems. Fall 1998.
Biography
João J. O. Pires received the Diploma degree in Electrical Engineering in 1981 and the M.Sc. and the Doctorate in Electrical and Computer Engineering en 1985 and 1993, respectively, from the Instituto Superior Técnico (IST), Technical University of Lisbon. Since 1981 he is with IST, where he is now an Assistant Professor. In 1994 he also joined the Instituto de Telecomunicações. During 1995 and 1997 he was a visiting scientist at the Photonic Networks Laboratory, University of Essex in United Kingdom.
He has lectured widely on optical communications and telecommunication systems and networks. He has carried out research in many areas related with optical communications, including optical receivers, analog optical systems for video applications, coherent optical systems, multigigabit/s direct detection systems, photonic switching and SDH and optical networks.
He was involved in RACE1051, RACE 2021 TRAVEL and RACE2028 MWTN projects. He was also involved in ACTS projects such as AC049 SPEED and AC066 OPEN. He was also the leader of two national projects. He has authored or co-authored of over 30 technical papers in the area of optical communications and networks. He is a member of the IEEE and Ordem dos Engenheiros in Portugal.
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Last updated 15/1/2001