Fernando Pedro Pereira Guiomar

Fernando Guiomar

Academic position:	Researcher
Joining date:	18-07-2011
Roles in IT:	Researcher
Thematic Line:	Optics and Photonics
Group:	Optical Communication Systems and Networking – Av

Email: Send Email
Address: IT – Aveiro
Instituto de Telecomunicações
Campus Universitário de Santiago
P-3810-193 AVEIRO - PORTUGAL
Tel: +351 234 377 900
Fax: +351 234 377 901

https://www.orcid.org/0000-0001-6404-8431

RESEARCHER ID SCOPUS SCHOLAR LinkedIn

Bio

Fernando Guiomar received the M.Sc. and Ph.D. degrees in Electronics and Telecommunications Engineering from University of Aveiro, Portugal, in 2009 and 2015, respectively. In 2015, he has received a Marie Skłodowska-Curie individual fellowship, project Flex-ON (grant agreement 653412), jointly hosted by Politecnico di Torino, Italy, and CISCO Optical GmbH, Nuremberg. In 2016, he has received the Photonics21 Student Innovation Award, distinguishing industrial-oriented research with high impact in Europe. In 2017, he has joined Instituto de Telecomunicações - Aveiro as an assistant researcher responsible for the national research infrastructure ORCIP, aimed at the testing and prototyping of future 5G solutions involving novel optical and radio technologies.

In 2020, he was awarded a 3-year research contract by the “la Caixa” Foundation, within the framework of the highly competitive Postdoctoral Junior Leader Fellowship program (ID 100010434). His main research interests are focused within the area of fiber-based and free-space optical communication systems, including the development of digital signal processing algorithms, advanced modulation and coding, constellation shaping and nonlinear modelling and mitigation. Fernando Guiomar is an IEEE and OSA member and he has authored or co-authored more than 100 scientific publications in leading international journals and conferences.

Scientific Achievements

Degrees

PhD, Universidade de Aveiro, 07-09-2015
MSc, Universidade de Aveiro, 01-01-2009

Affiliations

Instituto de Telecomunicações, 30-10-2017, Auxiliary Researcher
Politecnico di Torino, 16-10-2015 - 15-10-2017, Marie Skłodowska-Curie Fellow
Universidade de Aveiro, 01-01-2011 - 07-09-2015, PhD Student

Expertise Topics

Digital Signal Processing
Optical Networks
Coherent Optical Communications
Digital Equalization of Signal Impairments

Academic Activities

3Lecture courses

Sistemas de Informação , Universidade de Aveiro, Mestrado Integrado em Engenharia Eletrónica e Telecomunicações
Projeto Industrial, Universidade de Aveiro, Mestrado Integrado em Engenharia Eletrónica e Telecomunicações
Comunicações Digitais, Universidade de Aveiro, Mestrado em Eletrónica e Telecomunicações

6Supervision of PhD theses

Publications

2Books Chapters

I. Alimi, A. Mahmoud, A. O Mufutau, F. P. Guiomar, J. Rodriguez, P. Monteiro, A. Teixeira, Energy Efficiency in Cloud Radio Access Network (C-RAN) for 5G Mobile Networks: Opportunities and Challenges, Chapter in, Optical and Wireless Convergence for 5G Networks and Beyond, Wiley, London, 2019
S. Ranzini, V. Parahyba, J. Júnior, F. P. Guiomar, A. Carena Carena, Impact of Nonlinear Effects and Mitigation on Coherent Optical Systems, Chapter in, Optical Communications - Advanced Systems and Devices for Next Generation Networks, Springer International Publishing, New York City, 2019

46Papers in Journals

H. Harkat, P. Monteiro, A. Gameiro, F. P. Guiomar, H. Ahmed, A Survey on MIMO-OFDM Systems: Review of Recent Trends, signals, Vol. 3, No. 2, pp. 359 - 395, June, 2022,
| Abstract | BibTex
F. P. Guiomar, M. Fernandes, J. Nascimento, V. Rodrigues, P. Monteiro, Coherent Free-Space Optical Communications: Opportunities and Challenges, Journal of Lightwave Technology, Vol. 40, No. 10, pp. 3173 - 3186, May, 2022,
| Abstract | Full text (PDF 3 MBs) | BibTex
M. Fernandes, P. Monteiro, F. P. Guiomar, Free-Space Terabit Optical Interconnects, Journal of Lightwave Technology, Vol. 40, No. 5, pp. 1519 - 1526, March, 2022,
| Abstract | Full text (PDF 2 MBs) | BibTex
M. Fernandes, B. Brandão, A. Lorences-Riesgo, P. Monteiro, F. P. Guiomar, 5G-Compatible IF-Over-Fiber Transmission Using a Low-Cost SFP-Class Transceiver, IEEE Access, Vol. 10, No. 0, pp. 24601 - 24610, February, 2022,
| Abstract | Full text (PDF 1 MB) | BibTex
J. SANTOS, A. Carena, P. Monteiro, F. P. Guiomar, Artificial Neural Network Symbol Estimator With Enhanced Robustness to Nonlinear Phase Noise, IEEE Photonics Technology Letters, Vol. 33, No. 23, pp. 1341 - 1344, December, 2021,
| Abstract | Full text (PDF 1 MB) | BibTex
B. M. Oliveira, F. P. Guiomar, M. C. R. Medeiros, P. Monteiro, Enhancing Power Budget and Spectral Efficiency in Amplifier-Less Coherent Optical Links, IEEE Photonics Technology Letters, Vol. 33, No. 24, pp. 1383 - 1386, December, 2021,
| Abstract | Full text (PDF 7 MBs) | BibTex
C. M. Martins, F. P. Guiomar, A. N. Pinto, Hardware optimization of dual-stage carrier-phase recovery for coherent optical receivers, OSA Continuum, Vol. 4, No. 12, pp. 3157 - 3157, December, 2021,
| Abstract | Full text (PDF 5 MBs) | BibTex
R. K. Patel, F. P. Guiomar, M. Fernandes, I. Alimi, P. Monteiro, N. J. Muga, A. N. Pinto, Impact of Carrier Contribution Factor in the Self-Coherent DC-Value Method, Optics Express, Vol. 29, No. 25/6, pp. 41234 - 41245, November, 2021,
| Abstract | Full text (PDF 3 MBs) | BibTex
M. S. Neves, A. Carena Carena, Antonino Nespola, P. Monteiro, F. P. Guiomar, Joint Carrier-Phase Estimation for Digital Subcarrier Multiplexing Systems with Symbol-Rate Optimization, Journal of Lightwave Technology, Vol. 39, No. 20, pp. 6403 - 6412, October, 2021,
| Abstract | Full text (PDF 1 MB) | BibTex
A. O Mufutau, F. P. Guiomar, A. Oliveira, P. Monteiro, Software-Defined Radio Enabled Cloud Radio Access Network Implementation Using OpenAirInterface, Wireless Personal Communications, Vol., No., pp. -, September, 2021 | BibTex
B. M. Oliveira, A. Lorences-Riesgo, F. P. Guiomar, M. C. R. Medeiros, P. Monteiro, Optimizing Probabilistic Constellation Shaping for Amplifier-Less Coherent Optical Links, Journal of Lightwave Technology, Vol. 39, No. 13, pp. 4318 - 4330, July, 2021,
| Abstract | BibTex
M. Fernandes, B. Brandão, P. Georgieva, P. Monteiro, F. P. Guiomar, Adaptive optical beam alignment and link protection switching for 5G-over-FSO, Optics Express, Vol. 29, No. 13, pp. 20136 - 20136, June, 2021,
| Abstract | Full text (PDF 17 MBs) | BibTex
M. S. Neves, P. Monteiro, F. P. Guiomar, Enhanced Phase Estimation for Long-Haul Multi-Carrier Systems Using a Dual-Reference Subcarrier Approach, Journal of Lightwave Technology, Vol. 39, No. 9, pp. 2714 - 2724, May, 2021 | BibTex
R. M. Ferreira, F. P. Guiomar, P. Pissarra, M. Fernandes, B. Brandão, A. C. Messias, D. A. Formiga, M. M. Rodrigues, T. M. Vilela, P. Monteiro, F. Rodrigues, A. Teixeira, J.D. Reis, Rate Adaptability Using LUT-Based Distribution Matching for Probabilistic Constellation Shaping, IEEE Photonics Technology Letters, Vol. 33, No. 3, pp. 143 - 146, February, 2021,
| Abstract | BibTex
F. P. Guiomar, A. Lorences-Riesgo, D. ALBERGARIA, F. Rocco, A. Sousa, M. Fernandes, B. Brandão, A. Carena Carena, A. Teixeira, M. C. R. Medeiros, P. Monteiro, Adaptive Probabilistic Shaped Modulation for High-Capacity Free-Space Optical Links, Journal of Lightwave Technology, Vol. 38, No. 23, pp. 6529 - 6541, December, 2020 | BibTex
M. Fernandes, Pedro A. Loureiro Loureiro, B. Brandão, A. Lorences-Riesgo, F. P. Guiomar, P. Monteiro, Multi-Carrier 5G-Compliant DML-Based Transmission Enhanced by Bit and Power Loading, IEEE Photonics Technology Letters, Vol. 32, No. 12, pp. 737 - 740, June, 2020,
| Abstract | Full text (PDF 1 MB) | BibTex
O. Golani, D. Pilori, F. P. Guiomar, G. B. Bosco, A. Carena Carena, M. Shtaif, Correlated Nonlinear Phase-Noise in Multi-Subcarrier Systems: Modeling and Mitigation, Journal of Lightwave Technology, Vol. 38, No. 6, pp. 1148 - 1156, March, 2020 | BibTex
A. O Mufutau, F. P. Guiomar, M. Fernandes, A. Lorences-Riesgo, A. Oliveira, P. Monteiro, Demonstration of a hybrid optical fiber--wireless 5G fronthaul coexisting with end-to-end 4G networks, Journal of Optical Communications and Networking, Vol. 12, No. 3, pp. 72 - 78, February, 2020,
| Abstract | BibTex
A. Lorences-Riesgo, F. P. Guiomar, A. Sousa, A. Teixeira, N. J. Muga, M. C. R. Medeiros, P. Monteiro, 200 G Outdoor Free-Space-Optics Link Using a Single-Photodiode Receiver, Journal of Lightwave Technology, Vol. 38, No. 2, pp. 394 - 400, January, 2020,
| Abstract | BibTex
A. Brusin, F. P. Guiomar, A. Lorences-Riesgo, P. Monteiro, A. Carena Carena, Enhanced resilience towards ROADM-induced optical filtering using subcarrier multiplexing and optimized bit and power loading, Optics Express, Vol. 27, No. 21, pp. 30710 - 30710, October, 2019 | BibTex
S. Ziaie, F. P. Guiomar, N. J. Muga, Antonino Nespola, G. B. Bosco, A. Carena Carena, A. N. Pinto, Adaptive Stokes-Based Polarization Demultiplexing for Long-Haul Multi-Subcarrier Systems, IEEE Photonics Technology Letters, Vol. 31, No. 10, pp. 759 - 762, May, 2019 | BibTex
F. P. Guiomar, L. Bertignono, Antonino Nespola, A. Carena Carena, Frequency-Domain Hybrid Modulation Formats for High Bit-Rate Flexibility and Nonlinear Robustness, Journal of Lightwave Technology, Vol. 36, No. 20, pp. 4856 - 4870, October, 2018 | BibTex
C. Martins, L. Bertignono, Antonino Nespola, A. Carena, F. P. Guiomar, A. N. Pinto, Low-Complexity Time-Domain DBP Based on Random Step-Size and Partitioned Quantization, Journal of Lightwave Technology, Vol. 36, No. 14, pp. 2888 - 2895, April, 2018 | BibTex
S. B. Amado, N. J. Muga, F. P. Guiomar, A. N. Nespola, L. Bertignono, A. Carena Carena, A. N. Pinto, Nonlinear Mitigation for 400G Frequency-Hybrid Superchannels, Journal of Lightwave Technology, Vol. 45, No. 18, pp. 3963 - 3973, September, 2017 | BibTex
A. Shahpari, RMF Ferreira, R.S. Luis, Z. Vujicic, F. P. Guiomar, J.D. Reis, A. Teixeira, Coherent Access: A Review, Journal of Lightwave Technology, Vol. 35, No. 4, pp. 1050 - 1058, February, 2017,
| Abstract | BibTex
M. Gagni, F. P. Guiomar, S. Wabnitz, A. N. Pinto, Simplified High-Order Volterra Series Transfer Function for Optical Transmission Links, Optics Express, Vol. 25, No. 3, pp. 2446 - 2459, February, 2017 | BibTex
F. P. Guiomar, A. Carena Carena, G. B. Bosco, L. Bertignono, A. N. Nespola, P. P. Poggiolini, Nonlinear mitigation on subcarrier-multiplexed PM-16QAM optical systems, Optics Express, Vol. 25, No. 4, pp. 4298 - 4298, February, 2017 | BibTex
J. Cartledge, F. P. Guiomar, F. R. Kshischang, G. Liga, M. Yankov, Digital signal processing for fiber nonlinearities [Invited], Optics Express, Vol. 25, No. 3, pp. 1916 - 1916, January, 2017 | BibTex
JPFG Gonçalves, C. M. Martins, F. P. Guiomar, T.R. Cunha, J. C. Pedro, A. N. Pinto, P.M.L. Lavrador, Nonlinear compensation with DBP aided by memory polynomial, Optics Express, Vol. 24, No. 26, pp. 30309 - 30316, December, 2016,
| Abstract | BibTex
C. Martins, F. P. Guiomar, S. B. Amado, RMF Ferreira, S. Ziaie, A. Shahpari, A. Teixeira, A. N. Pinto, Distributive FIR-Based Chromatic Dispersion Equalization for Coherent Receivers, Journal of Lightwave Technology, Vol. 34, No. 21, pp. 5023 - 5032, November, 2016 | BibTex
F. P. Guiomar, R. Li, A. Carena Carena, C. Fludger, V. Curri, Hybrid Modulation Formats Enabling Elastic Fixed-Grid Optical Networks, Journal of Optical Communications and Networking, Vol. 8, No. 7, pp. A92 - A92, June, 2016 | BibTex
S. B. Amado, F. P. Guiomar, N. J. Muga, RMF Ferreira, J.D. Reis, S. M. R. Rossi, A. C. Chiuchiarelli, J. R. F. O. Oliveira, A. Teixeira, A. N. Pinto, Low Complexity Advanced DBP Techniques for Ultra-Long-Haul 400G Transmission Systems (Invited), Journal of Lightwave Technology, Vol. 34, No. 8, pp. 1793 - 1799, April, 2016 | BibTex
A. Shahpari, RMF Ferreira, F. P. Guiomar, S. B. Amado, S. Ziaie, C.Rodrigues Rodrigues, J.D. Reis, A. N. Pinto, A. Teixeira, Real-time bidirectional coherent Nyquist UDWDM-PON coexisting with multiple deployed systems in field-trial (Post-Deadline), Journal of Lightwave Technology, Vol. 34, No. 7, pp. 1643 - 1650, April, 2016,
| Abstract | BibTex
F. P. Guiomar, S. B. Amado, RMF Ferreira, J.D. Reis, S. M. R. Rossi, A. C. Chiuchiarelli, J. R. F. O. Oliveira, A. Teixeira, A. N. Pinto, Multi-Carrier Digital Backpropagation for 400G Optical Superchannels (Invited), Journal of Lightwave Technology, Vol. 34, No. 8, pp. 1896 - 1907, April, 2016 | BibTex
RMF Ferreira, J.D. Reis, S. M. R. Rossi, S. B. Amado, A. Shahpari, F. P. Guiomar, J. R. F. O. Oliveira, A. N. Pinto, A. Teixeira, Coherent Nyquist UDWDM-PON with digital signal processing in real-time (Invited), Journal of Lightwave Technology, Vol. 34, No. 2, pp. 826 - 833, January, 2016,
| Abstract | BibTex
A. Shahpari, RMF Ferreira, V. M. C. Ribeiro, A. Sousa Sousa, S. Ziaie, A. Tavares, Z. Vujicic, F. P. Guiomar, J.D. Reis, A. N. Pinto, A. Teixeira, Coherent ultra dense wavelength division multiplexing passive optical networks, Optical Fiber Technology, Vol. 26, No. Part A, pp. 100 - 107, December, 2015,
| Abstract | BibTex
S. Ziaie, N. J. Muga, F. P. Guiomar, RMF Ferreira, G. Fernandes, A. Shahpari, A. Teixeira, A. N. Pinto, Experimental assessment of the adaptive Stokes space-based polarization demultiplexing for optical metro and access networks, Journal of Lightwave Technology, Vol. 33, No. 23, pp. 4968 - 4974, December, 2015,
| Abstract | BibTex
RMF Ferreira, J.D. Reis, S. B. Amado, A. Shahpari, F. P. Guiomar, J. R. F. O. Oliveira, A. N. Pinto, A. Teixeira, Performance and complexity of digital clock recovery for Nyquist UDWDM-PON in real-time, IEEE Photonics Technology Letters, Vol. 27, No. 21, pp. 2230 - 2233, November, 2015,
| Abstract | BibTex
F. P. Guiomar, S. B. Amado, C. M. Martins, A. N. Pinto, Time Domain Volterra-Based Digital Backpropagation for Coherent Optical Systems, Journal of Lightwave Technology, Vol. 33, No. 15, pp. 3170 - 3181, August, 2015,
| Abstract | Full text (PDF 565 KBs) | BibTex
F. P. Guiomar, S. B. Amado, A. Carena Carena, G. B. Bosco, A. N. Nespola, A. Teixeira, A. N. Pinto, Fully Blind Linear and Nonlinear Equalization for 100G PM-64QAM Optical Systems, Journal of Lightwave Technology, Vol. 33, No. 7, pp. 1265 - 1274, April, 2015,
| Abstract | BibTex
F. P. Guiomar, A. N. Pinto, Simplified Volterra Series Nonlinear Equalizer for Polarization-Multiplexed Coherent Optical Systems, Journal of Lightwave Technology, Vol. 31, No. 13, pp. 3879 - 3891, December, 2013,
| Abstract | Full text (PDF 642 KBs) | BibTex
F. P. Guiomar, J.D. Reis, A. Carena Carena, G. B. Bosco, A. Teixeira, A. N. Pinto, Experimental demonstration of a frequency-domain Volterra series nonlinear equalizer in polarization-multiplexed transmission, Optics Express, Vol. 21, No. 1, pp. 276 - 288, January, 2013,
| Abstract | BibTex
F. P. Guiomar, N. J. Muga, A. N. Pinto, C.Rodrigues Rodrigues, L. Marques, P. Mão-Cheia, F. Macedo, Processamento digital adaptativo em sistemas óticos 40/100G, Revista Saber e Fazer Telecomunicações, Vol., No., pp. 135 - 141, December, 2012,
| Abstract | BibTex
F. P. Guiomar, J.D. Reis, A. Teixeira, A. N. Pinto, Mitigation of intra-channel nonlinearities using a frequency-domain Volterra series equalizer, Optics Express, Vol. 20, No. 2, pp. 1360 - 1369, January, 2012,
| Abstract | Full text (PDF 1 MB) | BibTex
F. P. Guiomar, A. N. Pinto, C.Rodrigues Rodrigues, P. Mão-Cheia, Transmissão e Receção Coerente a 40Gb/s e 100Gb/s, Revista Saber e Fazer Telecomunicações, Vol. 9, No. --, pp. 128 - 133, December, 2011,
| Abstract | BibTex
F. P. Guiomar, J.D. Reis, A. Teixeira, A. N. Pinto, Digital Post-Compensation Using Volterra Series Transfer Function, IEEE Photonics Technology Letters, Vol. 23, No. 19, pp. 1412 - 1414, October, 2011,
| Abstract | BibTex

74Papers in Conferences

M. Fernandes, J. Nascimento, P. Monteiro, F. P. Guiomar, Highly Reliable Outdoor 400G FSO Transmission Enabled by ANN Channel Estimation, OSA Optical Fiber Communications - OFC, San Diego, United States, March, 2022,
| Abstract | Full text (PDF 4 MBs) | BibTex
M. Fernandes, P. Monteiro, F. P. Guiomar, 400G MIMO-FSO Transmission with Enhanced Reliability Enabled by Joint LDPC Coding, European Conference on Optical Communication ECOC, Bordeaux, France, September, 2021,
| Abstract | Full text (PDF 1 MB) | BibTex
R. K. Patel, F. P. Guiomar, M. Fernandes, I. Alimi, P. Monteiro, N. J. Muga, A. N. Pinto, Virtual Carrier Assisted Self-Coherent Detection Employing DC-Value Method, OSA Optical Fiber Communications - OFC, San Francisco, United States, June, 2021 | BibTex
M. Fernandes, B. Brandão, A. C. Messias, T. M. Vilela, D. A. Formiga, J.D. Reis, P. Monteiro, F. P. Guiomar, AI-Based Cooperative Optimization of Pre- and Post-Compensation Filters for Coherent Transceivers with Limited Bandwidth and ENOB, OSA Optical Fiber Communications - OFC, San Francisco, United States, June, 2021,
| Abstract | Full text (PDF 487 KBs) | BibTex
M. Fernandes, P. Monteiro, F. P. Guiomar, Single-Wavelength Terabit FSO Channel for Datacenter Interconnects Enabled by Adaptive PCS, OSA Optical Fiber Communications - OFC, San Francisco, United States, June, 2021,
| Abstract | Full text (PDF 8 MBs) | BibTex
J. H. Silva, L. S. L. Leitão, F. P. Guiomar, P. Monteiro, Development and Experimental Validation of a 5G-NR Simulator Supporting Carrier Aggregation, Conference on Telecommunications - ConfTele, Leiria, Portugal, February, 2021,
| Abstract | BibTex
J. Nascimento, M. Fernandes, F. P. Guiomar, P. Monteiro, Experimental Analysis of the Impact of Indoor Turbulence on FSO for Intra-Datacenter Communications, Conference on Telecommunications - ConfTele, Leiria, Portugal, February, 2021,
| Abstract | Full text (PDF 2 MBs) | BibTex
A. O Mufutau, F. P. Guiomar, M. Fernandes, A. Oliveira, P. Monteiro, On the Suitability of VLC Enabled Fronthaul for Future Mobile Network, Conference on Telecommunications - ConfTele ConfTELE, Leiria, Portugal, Vol., pp. 1 - 4, February, 2021,
| Abstract | BibTex
M. S. Neves, P. Monteiro, F. P. Guiomar, Chromatic Dispersion-Aware Carrier-Phase Estimation for Digital Subcarrier Multiplexing Systems, European Conference on Optical Communication ECOC, Conference online, December, 2020 | BibTex
A. Lorences-Riesgo, F. P. Guiomar, B. M. Oliveira, M. C. R. Medeiros, P. Monteiro, Joint Optimization of Coding, Shaping and Clipping for Amplifier-Less Coherent Optical Systems, OSA Optical Fiber Communications - OFC, San Diego, United States, March, 2020 | BibTex
M. Oliveira, M. Fernandes, P. S. Santos, F. P. Guiomar, L. Alves, A. P. Pohl, P. Monteiro, Experimental Transmission of LTE Signal Using Visible Light Communications, Microwave and Optoelectronics Conference (IMOC) SBMO/IEEE MTT-S International IMOC, Aveiro, Portugal, November, 2019,
| Abstract | Full text (PDF 270 KBs) | BibTex
F. P. Guiomar, A. Lorences-Riesgo, D. ALBERGARIA, F. Rocco, A. Sousa, A. Carena Carena, A. Teixeira, M. C. R. Medeiros, P. Monteiro, High-Capacity and Rain-Resilient Free-Space Optics Link Enabled by Time-Adaptive Probabilistic Shaping, European Conference on Optical Communication ECOC, Dublin, Ireland, September, 2019 | BibTex
P. Monteiro, I. Alimi, F. P. Guiomar, A. Lorences-Riesgo, A. O Mufutau, A. Gameiro, Flexible Optical and Wireless Testbed for 5G and Beyond Communication Systems, OSA Advanced Photonics Congress, San Francisco, United States, August, 2019 | BibTex
B. M. Oliveira, A. Lorences-Riesgo, F. P. Guiomar, M. C. R. Medeiros, P. Monteiro, Transmission Range of High-Capacity 100-QAM with Probabilistic Constellation Shaping, Conference on Telecommunications - ConfTele, Lisbon, Portugal, June, 2019 | BibTex
B. Brandão, A. Lorences-Riesgo, F. P. Guiomar, P. Monteiro, On the Design and Optimisation of an RF Frontend for a Multi-RAT Optical Access Testbed, Conference on Telecommunications - ConfTele, Lisbon, Portugal, June, 2019 | BibTex
D. ALBERGARIA, F. Rocco, A. Carena Carena, F. P. Guiomar, A. Lorences-Riesgo, P. Monteiro, Characterization and Modeling of Link Loss for an Outdoor Free-Space Optics Transmission System, Conference on Telecommunications - ConfTele, Lisbon, Portugal, June, 2019 | BibTex
M. Fernandes, A. Lorences-Riesgo, F. P. Guiomar, P. Monteiro, Optimization of Low-Cost Analog Optical Transceivers for a C-RAN Outdoor Testbed, Conference on Telecommunications - ConfTele, Lisboa, Portugal, June, 2019,
| Abstract | Full text (PDF 883 KBs) | BibTex
A. Lorences-Riesgo, F. P. Guiomar, A. Sousa, A. Teixeira, N. J. Muga, P. Monteiro, 200 Gbit/s Free-Space Optics Transmission Using a Kramers-Kronig Receiver, OSA Optical Fiber Communications - OFC, San Diego, United States, March, 2019 | BibTex
F. P. Guiomar, A. Lorences-Riesgo, A. Brusin, D. Morillo, A. Carena Carena, P. Monteiro, Reducing ROADM Filtering Penalties using Subcarrier Multiplexing with Offline Bit and Power Loading, European Conference on Optical Communication ECOC, Rome, Italy, September, 2018 | BibTex
F. P. Guiomar, I. Alimi, P. Monteiro, A. Gameiro, Flexible Infrastructure for the Development and Integration of Access / Fronthauling Solutions in Future Wireless Systems, IEEE INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS - SPAWC, Kalamata, Greece, June, 2018 | BibTex
F. P. Guiomar, L. Bertignono, A. N. Nespola, P. P. Poggiolini, F. Forghieri, A. Carena Carena, Combining Probabilistic Shaping and Nonlinear Mitigation: Potential Gains and Challenges, OSA Optical Fiber Communications - OFC, San Diego, United States, March, 2018 | BibTex
M. Cantono, F. P. Guiomar, A. Carena Carena, V. Curri, Networking Benefit of Multi-Subcarrier Transceivers, OSA Optical Fiber Communications - OFC, San Diego, United States, March, 2018 | BibTex
P. P. Poggiolini, G. B. Bosco, A. Carena Carena, F. P. Guiomar, M. Zefreh, F. Forghieri, S. Piciaccia, Non-Linearity Modeling at Ultra-High Symbol Rates, OSA Optical Fiber Communications - OFC, San Diego, United States, March, 2018 | BibTex
C. Martins, L. Bertignono, Antonino Nespola, A. Carena Carena, F. P. Guiomar, A. N. Pinto, Efficient Time-Domain DBP using Random Step-Size and Multi-Band Quantization, OSA Optical Fiber Communications - OFC, San Diego, United States, March, 2018 | BibTex
S. Ziaie, RMF Ferreira, N. J. Muga, F. P. Guiomar, A. Shahpari, A. Teixeira, A. N. Pinto, Coherent UDWDM transceivers based on adaptive Stokes space polarization de-multiplexing in real-time, European Conference on Optical Communication ECOC, Gothenburg, Sweden, Vol. Th.1.B.4, pp. 1 - 3, September, 2017 | BibTex
F. P. Guiomar, L. Bertignono, D. Pilori, A. N. Nespola, G. B. Bosco, A. Carena Carena, F. Forghieri, Comparing Different Options for Flexible Networking: Probabilistic Shaping vs. Hybrid Subcarrier Modulation, European Conference on Optical Communication ECOC, Gothenburg, Sweden, September, 2017 | BibTex
A. Carena Carena, F. P. Guiomar, On the Accumulation of Non-Linear Interference in Multi-Subcarrier Systems, European Conference on Optical Communication ECOC, Gothenburg, Sweden, September, 2017 | BibTex
C. Martins, S. Amado, R. Ferreira, A. Shahpari, A. Teixeira, F. P. Guiomar, A. N. Pinto, Real-Time Demonstration of Low-Complexity Time-Domain Chromatic Dispersion Equalization, International Conference on Transparent Optical Networks ICTON, Girona, Spain, July, 2017 | BibTex
F. P. Guiomar, L. Bertignono, A. N. Nespola, A. Carena Carena, Mitigation of transceiver bandwidth limitations using multi-subcarrier signals, International Conf. on Transparent Optical Networks - ICTON, Girona, Spain, July, 2017 | BibTex
C. Martins, S. B. Amado, S. Rossi, A. C. Chiuchiarelli, J.D. Reis, A. Carena Carena, F. P. Guiomar, A. N. Pinto, Low-Complexity Chromatic Dispersion Equalizer for 400G Transmission Systems, Encontro com a Ciência e Tecnologia em Portugal, Lisbon, Portugal, July, 2017 | BibTex
S. Ziaie, N. J. Muga, RMF Ferreira, F. P. Guiomar, A. Shahpari, A. Teixeira, A. N. Pinto, Adaptive Stokes Space Based Polarization Demultiplexing for Flexible UDWDM Metro-Access Networks, OSA Optical Fiber Communications - OFC, Los Angeles, United States, Vol. Th1K.6, pp. 1 - 3, March, 2017 | BibTex
S. B. Amado, F. P. Guiomar, N. J. Muga, A. N. Nespola, L. Bertignono, A. Carena Carena, A. N. Pinto, 400G Frequency-Hybrid Superchannel for the 62.5 GHz Slot, OSA Optical Fiber Communications - OFC, Los Angeles, United States, March, 2017 | BibTex
C. Martins, S. B. Amado, S. Rossi, A. Chiuchiarelli, J.D. Reis, A. Carena, F. P. Guiomar, A. N. Pinto, Low-Complexity Chromatic Dispersion Equalizer for 400G Transmission Systems, OSA Optical Fiber Communications - OFC, Los Angeles, United States, March, 2017 | BibTex
F. P. Guiomar, A. Carena Carena, G. B. Bosco, L. Bertignono, A. N. Nespola, P. P. Poggiolini, Effectiveness of Symbol-Rate Optimization with PM-16QAM Subcarriers in WDM Transmission, OSA Optical Fiber Communications - OFC, Los Angeles, United States, March, 2017 | BibTex
G. B. Bosco, D. Pilori, P. P. Poggiolini, A. Carena Carena, F. P. Guiomar, Scalable Modulation Technology and the Tradeoff of Reach, Spectral Efficiency and Complexity, SPIE Photonics West, San Francisco, United States, January, 2017 | BibTex
F. P. Guiomar, Advanced Techniques For Digital Nonlinear Compensation In Multi-carrier Optical Transmission Systems, OSA Frontiers in Optics, Rochester, United States, October, 2016 | BibTex
A. N. Pinto, S. B. Amado, C. Martins, S. Ziaie, N. J. Muga, F. P. Guiomar, Multi-Carrier High-Speed Optical Communication Systems Supported by Digital Signal Processing, International Conf. on Transparent Optical Networks - ICTON, Trento, Italy, Vol. Mo.B1.2, pp. 1 - 4, July, 2016 | BibTex
F. P. Guiomar, A. Carena Carena, Achieving Fine Bit-Rate Granularity with Hybrid Subcarrier Modulation, OSA Signal Processing in Photonic Communications - SPPCom, Vancouver, Canada, July, 2016 | BibTex
S. Ziaie, N. J. Muga, RMF Ferreira, F. P. Guiomar, A. Shahpari, A. Teixeira, A. N. Pinto, Flexible and Hybrid bidirectional optical metro networking using adaptive Stokes space polarization demultiplexing, European Conf. on Networks and Optical Communications - NOC, Lisbon, Portugal, Vol. CD, pp. 1 - 4, June, 2016 | BibTex
A. Shahpari, A. Teixeira, RMF Ferreira, F. P. Guiomar, J.D. Reis, Coherent Access [Invited Paper], OSA Optical Fiber Communications - OFC, Anaheim, United States, Vol. Cd, pp. 1 - 3, March, 2016 | BibTex
T. Almeida, A. Shahpari, Ana M. Rocha, R. Oliveira, F. P. Guiomar, A. Teixeira, A. N. Pinto, P.S André, R.N. Nogueira, Experimental demonstration of selective core coupling in multicore fibers of a 200 Gb/s DP-16QAM signal, OSA Optical Fiber Communications - OFC, Anaheim,, United States, Vol. Tu3I.4, pp. 1 - 4, March, 2016 | BibTex
RMF Ferreira, A. Shahpari, F. P. Guiomar, S. B. Amado, M. V. Drummond, J.D. Reis, A. N. Pinto, A. Teixeira, Hardware Optimization for Carrier Recovery based on Mth Power Schemes, OSA Optical Fiber Communications - OFC, Anaheim, United States, Vol. Th2A.43, pp. 1 - 3, March, 2016 | BibTex
S. Ziaie, F. P. Guiomar, RMF Ferreira, S. B. Amado, A. Shahpari, A. Teixeira, A. N. Pinto, 100 Gb/s DP-QPSK transmission over 8000 km of standard single mode fiber using recirculating loop technique, Conf. on Telecommunications - ConfTele, Aveiro, Portugal, Vol. CD, pp. 28 - 31, September, 2015 | BibTex
S. B. Amado, F. P. Guiomar, N. J. Muga, J.D. Reis, A. Teixeira, A. N. Pinto, Experimental Demonstration of theWeighted Volterra Series Nonlinear Equalizer, Conf. on Telecommunications - ConfTele, Aveiro, Portugal, Vol. 1, pp. 197 - 200, September, 2015 | BibTex
S. B. Amado, F. P. Guiomar, N. J. Muga, J.D. Reis, A. Teixeira, A. N. Pinto, Experimental Demonstration of the Parallel Split-Step Method in Ultra-Long-Haul 400G Transmission, European Conf. on Optical Communications - ECOC, Valencia, Spain, Vol. 1, pp. 1 - 3, September, 2015 | BibTex
JPFG Gonçalves, P.M.L. Lavrador, F. P. Guiomar, A. N. Pinto, T.R. Cunha, J. C. Pedro, Nonlinear Behavioral Modeling Equalization Techniques for Optical Transmission Systems, Conf. on Telecommunications - ConfTele, Aveiro, Portugal, Vol. 1, pp. 1 - 3, September, 2015,
| Abstract | BibTex
RMF Ferreira, A. Shahpari, F. P. Guiomar, S. B. Amado, C.Rodrigues Rodrigues, J.D. Reis, A. N. Pinto, A. Teixeira, Field-Trial of a Real-Time Bidirectional UDWDM-PON Coexisting with GPON, RF Video Overlay and NG-PON2 Systems, European Conf. on Optical Communications - ECOC, Valencia, Spain, Vol. CD, pp. 1 - 3, September, 2015 | BibTex
A. N. Pinto, F. P. Guiomar, S. B. Amado, C. Martins, S. Ziaie, N. J. Muga, Digital Signal Processing for Coherent Optical Communication Systems, Annual International Conference on Advanced Laser Technologies ALT, Faro, Portugal, September, 2015 | BibTex
F. P. Guiomar, S. B. Amado, C. Martins, A. N. Pinto, Digital Equalization of Nonlinear Fiber Impairments in Coherent Optical Transmission Systems, International OSA Network of Students (IONS), Valencia, Spain, September, 2015 | BibTex
F. P. Guiomar, S. B. Amado, J.D. Reis, S. M. R. Rossi, A. C. Chiuchiarelli, J. R. F. O. Oliveira, A. Teixeira, A. N. Pinto, Ultra-Long-Haul 400G Superchannel Transmission with Multi-Carrier Nonlinear Equalization, European Conference on Optical Communication ECOC, Valencia, Spain, September, 2015 | BibTex
N. J. Muga, S. Ziaie, A. Shahpari, F. P. Guiomar, A. N. Pinto, Optimizing polarization related dynamic equalization in coherent optical communications, International Conf. on Transparent Optical Networks - ICTON, Budapest, Hungary, Vol. Mo.C1.6, pp. 1 - 4, July, 2015,
| Abstract | BibTex
A. N. Pinto, S. B. Amado, C. M. Martins, S. Ziaie, N. J. Muga, Ricardo Ferreira Ferreira, A. Teixeira, F. P. Guiomar, Real-time Digital Signal Processing for Coherent Optical Systems, International Conf. on Transparent Optical Networks - ICTON, Budapest, Hungary, Vol. Mo.C1.2, pp. 1 - 5, July, 2015 | BibTex
S. B. Amado, F. P. Guiomar, N. J. Muga, A. N. Pinto, Assessment of Nonlinear Equalization Algorithms for Coherent Optical Transmission Systems using an FPGA, International Conf. on Transparent Optical Networks - ICTON, Budapest, Hungary, Vol. Mo.C1.4, pp. 1 - 4, July, 2015,
| Abstract | Full text (PDF 332 KBs) | BibTex
F. P. Guiomar, S. B. Amado, C. Martins, J.D. Reis, A. Teixeira, A. N. Pinto, Volterra-based Digital Backpropagation: Performance and Complexity Assessment, OSA Signal Processing in Photonic Communications - SPPCom, Boston, United States, June, 2015 | BibTex
F. P. Guiomar, S. B. Amado, C. M. Martins, A. N. Pinto, Parallel Split-Step Method for Digital Backpropagation, OSA Optical Fiber Communications - OFC, Los Angeles, United States, Vol. 0, pp. 1 - 3, March, 2015,
| Abstract | BibTex
F. P. Guiomar, A. Carena Carena, G. B. Bosco, A. N. Nespola, A. N. Pinto, Transmission of PM-64QAM over 1524 km of PSCF using Fully-Blind Equalization and Volterra-Based Nonlinear Mitigation, European Conf. on Optical Communications - ECOC, Cannes, France, Vol., pp. 1 - 2, September, 2014,
| Abstract | BibTex
A. Shahpari, RMF Ferreira, V. M. C. Ribeiro, Z. Vujicic, F. P. Guiomar, S. Ziaie, M. J. N. Lima, A. N. Pinto, A. Teixeira, Free space optics hybrid PTMP advanced modulation bidirectional PON, European Conf. on Optical Communications - ECOC, Cannes, France, Vol. CD, pp. P.7.16 - P.7.16, September, 2014,
| Abstract | BibTex
RMF Ferreira, A. Shahpari, S. B. Amado, P. Costa Costa, J.D. Reis, F. P. Guiomar, A. N. Pinto, A. Teixeira, Impact of TWDM on optional real-time QPSK WDM channels, European Conf. on Optical Communications - ECOC, Cannes, France, Vol. CD, pp. 1 - 3, September, 2014 | BibTex
F. P. Guiomar, S. B. Amado, A. N. Pinto, Reducing the Complexity of Digital Nonlinear Compensation for High-Speed Coherent Optical Communication Systems, International Conference on Applications of Optics and Photonics - AOP2014, Aveiro, Portugal, Vol. 9826, pp. 92864L-1 - 92864L-9, August, 2014,
| Abstract | BibTex
A. N. Pinto, F. P. Guiomar, R. M. Ferreira, A. Teixeira, S. Ziaie, A. Shahpari, N. J. Muga, Digital Equalization of Optical Nonlinearities in Very High-Speed Optical Communication Systems, International Conf. on Transparent Networks – ICTON, Graz, Austria, Vol. We.D1.1, pp. 1 - 5, July, 2014 | BibTex
S. B. Amado, F. P. Guiomar, S. Ziaie, A. Teixeira, N. J. Muga, A. N. Pinto, Clock and carrier recovery in high-speed coherent optical communication systems, International Conf. on Applications of Optics and Photonics - AOP, Aveiro, Portugal, Vol. 1, pp. 1 - 7, May, 2014,
| Abstract | BibTex
F. P. Guiomar, A. N. Pinto, Terabit-Per-Second Optical Communication Systems Enabled by Digital Signal Processing, European Industrial Doctoral School Summer Workshop EIDS, Pardubice, Czech Republic, Vol. 1, pp. 42 - 43, May, 2014 | BibTex
F. P. Guiomar, N. J. Muga, J.D. Reis, A. Teixeira, A. N. Pinto, Simplified Volterra Series Nonlinear Equalizer by Intra-Channel Cross-Phase Modulation Oriented Pruning, European Conf. on Optical Communications - ECOC, London, United Kingdom, Vol. -, pp. We.3.C.6 -, September, 2013,
| Abstract | BibTex
N. J. Muga, F. P. Guiomar, A. N. Pinto, Stokes Space Based Digital PolDemux for Polarization Switched-QPSK Signals, Conf. on Lasers and Electro-optic - CLEO, San Jose, United States, Vol. CM1G.4, pp. - - -, June, 2013,
| Abstract | BibTex
A. N. Pinto, N. J. Muga, F. P. Guiomar, Equalization of Fiber Impairments Using High-Speed Digital Signal Processing, International Conf. on Transparent Optical Networks - ICTON, Cartagena, Spain, June, 2013 | BibTex
S. B. Amado, F. P. Guiomar, A. N. Pinto, Digital Equalization of Chromatic Dispersion in an FPGA, Conf. on Telecommunications - ConfTele, Castelo Branco, Portugal, Vol. 1, pp. 1 - 4, May, 2013,
| Abstract | BibTex
J.D. Reis, A. Shahpari, RMF Ferreira, F. P. Guiomar, D. Neves, A. N. Pinto, A. Teixeira, Analysis of Transmission Impairments on Terabit Aggregate PONs, OSA Optical Fiber Communications - OFC, Anaheim, United States, Vol. CD, pp. OM2A5 - --, March, 2013,
| Abstract | BibTex
F. P. Guiomar, J.D. Reis, A. Carena Carena, G. B. Bosco, A. Teixeira, A. N. Pinto, Experimental Demonstration of a Frequency-Domain Volterra Series Nonlinear Equalizer in Polarization-Multiplexed Transmission, European Conf. on Optical Communications - ECOC, Amsterdam, Netherlands, Vol. CD, pp. Th.1.D.1 -, September, 2012,
| Abstract | BibTex
F. P. Guiomar, A. N. Pinto, Receiver-side Digital Signal Processing for 100-GE Coherent Optical Transmission Systems, European Conf. on Networks and Optical Communications and Conf. on Optical Cabling and Infrastructure - NOC/OC, Barcelona, Spain, Vol. CD, pp. -, June, 2012,
| Abstract | BibTex
M. Forzati, J. Mårtensson, H.-M. Chin, M. Mussolin, D. Rafique, F. P. Guiomar, Non-linear compensation techniques for coherent fibre transmission, Asia Communications and Photonics Conf. - ACP, Shanghai, China, November, 2011 | BibTex
F. P. Guiomar, J.D. Reis, A. Teixeira, A. N. Pinto, Mitigation of Intra-Channel Nonlinearites Using a Frequency-Domain Volterra Series Equalizer, European Conf. on Optical Communications - ECOC, Geneve, Switzerland, Vol. CD, pp. Tu.6.B.1 -, September, 2011,
| Abstract | BibTex
F. P. Guiomar, A. N. Pinto, Optimizing the Nonlinear Operator in Backward Propagation, Conf. on Telecommunications - ConfTele, Lisboa, Portugal, Vol. 1, pp. 1 - 4, April, 2011,
| Abstract | BibTex
F. P. Guiomar, A. N. Pinto, Backward Propagation Algorithms for Digital Post-Compensation of Fiber Impairments, BONE Summer School, Budapest, Hungary, Vol., pp. 58 - 60, September, 2010,
| Abstract | BibTex
F. P. Guiomar, A. N. Pinto, Impairment Compensation of a Single-Channel NRZ-QPSK Optical System through Digital Backward Propagation, European Conf. on Networks and Optical Communications and Conf. on Optical Cabling and Infrastructure - NOC/OC, Faro, Portugal, Vol. 1, pp. 197 - 202, June, 2010,
| Abstract | BibTex

Patents

3Patents

Method for embeded data modulation over pilot symbols in QAM transmission systems, 117250, National, Pending, 24-05-2021, Portugal
Method and system for correcting and monitoring phase noise in coherent optical multi-carrier systems with chromatic dispersion, PCT/IB2021/053476, PCT, 27-04-2020,
| Abstract
Método de Equalização Não-Linear do Canal Óptico no Domínio da Frequência, PT105765, National, Granted, 17-06-2011, Portugal

Projects

Currently running projects6

Acronym	Name	Funding Agency	Start date	Ending date
Dior	Deep Intelligent Optical and Radio Communication Networks	EC	01-12-2021	30-11-2025
FreeCom-B5G	Ultra-high-capacity free-space optical communications for beyond 5G	IT	01-01-2020	31-12-2022
Huawei-DSP	Digital Signal Processing for Digital Subcarrier Multiplexing	Huawei Technologies France	21-04-2021	20-10-2022
Opt5G+	High-capacity optical transmission infrastructure to support 5G communications and beyond	La Caixa Foundation	01-05-2020	30-04-2023
OptWire	Next-Generation Optical Wireless Communications Enabled by Artificial Intelligence	FCT	01-12-2021	30-11-2024
ORCIP	Optical Radio Convergence Infrastructure for Communications and Power Delivering	PO Centro	01-05-2017	30-04-2029

Closed Projects8

Acronym	Name	Funding Agency	Start date	Ending date
AdvMH	Advanced Features for Multi-Haul Optical Transmission Systems	Idea! Eletronic Systems	29-11-2018	31-12-2019
advMH-2020	Advanced Features for Multi-Haul Optical Transmission Systems	Idea! Eletronic Systems	01-01-2020	30-06-2020
DiNEq	Digital Nonlinear Equalization in Very-High Speed Coherent Optical Transmission Systems	FCT/PTDC	01-07-2013	01-06-2015
IDEA-2020	Spec & Modeling for 400G+/800G+ Optical Systems – Phase 3	Idea! Eletronic Systems	01-07-2020	31-03-2021
IDEA-2021	Spec & Modeling for 400G+/800G+ Optical Systems – Phase 4	Idea! Eletronic Systems	01-04-2021	31-03-2022
NG-COS	Next-Generation Coherent Optical Communication Systems	IT/LA	01-09-2011	01-08-2013
PANORAMA II	Desenvolvimento de um Sistema de Telecomunicações sustentado em Plataformas Ópticas e de Rádio Avançadas com gestão integrada	PT Inovação	01-01-2013	01-01-2015
VADONetC	Simplified Volterra analysis for dynamical optical networks compensation	IT/LA	01-06-2014	01-05-2016

Other Scientific Achievements

5Awards

F. P. Guiomar, Photonics 21 Student Innovation Award, Awarded by the European Technology Platform Photonics21 for high-quality photonics-related research with high industrial impact., 01-03-2016
F. P. Guiomar, Marie Skłodowska-Curie Grant for an Individual Fellowship, Research grant for a 2-years fellowship awarded by the European Commission in the framework of the Horizon 2020 Research and Innovation programme., 01-10-2015
F. P. Guiomar, Runner-up of ECOC2015 Best Student Paper Prize, Honorable mention (2nd place) for the work “Ultra-Long-Haul 400G Superchannel Transmission with Multi-Carrier Nonlinear Equalization”, on the Best Student Paper Prize Competition at ECOC2015, Valencia, Spain., 01-09-2015
F. P. Guiomar, FLAD Travel Grant, Grant to support the travelling expenses related with the participation on the “Optics & Photonics Congress on Advanced Photonics”, held in Boston, USA., 01-06-2015
F. P. Guiomar, Best Engineering Poster at UA Research Day, Awarded to the best engineering-related poster at the University of Aveiro research day, 01-07-2013

Other Contributions

6Conference Committees

International Conf. on Photonics, Optics and Laser Technology - PHOTOPTICS Photoptics, Technical Programme Committee, 2019
International Optics and Photonics Conference SBFOTON, Technical Programme Committee, 2018
International Conf. on Transparent Optical Networks - ICTON, Technical Programme Committee, 2018
International Conf. on Transparent Optical Networks - ICTON, Technical Programme Committee, 2017
OSA Frontiers in Optics, Sessions Chairman, 2016
International OSA Network of Students (IONS), Organizing Committee, 2015

13Refereeing Journals

Journal of Lightwave Technology
2019, 2 review(s); 2018, 3 review(s); 2017, 3 review(s); 2016, 1 review(s); 2015, 1 review(s);
IEEE Access
2018, 1 review(s);
Optics Express
2018, 1 review(s); 2017, 1 review(s); 2016, 1 review(s); 2014, 1 review(s); 2013, 1 review(s); 2012, 1 review(s);
IEEE Photonics Technology Letters
2018, 5 review(s); 2017, 5 review(s); 2016, 2 review(s);
Optical Fiber Technology
2017, 1 review(s); 2015, 1 review(s);
Electronics Letters
2016, 1 review(s);
IEEE Transactions on Magnetics
2016, 1 review(s);
Optics Letters
2016, 1 review(s);
IEEE Transactions on Microwave Theory and Techniques
2015, 1 review(s);
IEEE Photonics Journal
2015, 1 review(s);
Photonic Network Communications
2015, 1 review(s);
IEEE Signal Processing Letters
2015, 1 review(s);
Journal of Optical Communications and Networking
2012, 1 review(s);

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