Article
Engineering, Electrical & Electronic
Bin Chen, Yi Lei, Gabriele Liga, Zhiwei Liang, Wei Ling, Xuwei Xue, Alex Alvarado
Summary: Shaping modulation formats in multi-dimensional space is an effective approach to improve spectral efficiency in both AWGN channel and optical fiber channel. The first part of the paper reviews existing MD geometrically-shaped modulations for fiber optical communications, emphasizing the gains obtained through correlation exploitation and increasing modulation format cardinality, along with discussing practical limitations and challenges with efficient solutions. The second part presents extensions to the 4D modulation format family and optimization for designing nonlinear-tolerant 4D modulation formats, resulting in significant improvements in spectrum efficiency and effective SNRs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Hami Rabbani, Hamid Hosseinianfar, Hamed Rabbani, Maite Brandt-Pearce
Summary: This paper introduces a nonlinear model for multi-channel WDM systems, valid for arbitrary modulation formats, including asymmetric ones. The model focuses on the XPM nonlinear term to reduce nonlinear interference undergone by these formats.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Erik Borjeson, Per Larsson-Edefors
Summary: The text introduces the circuit implementations of one- and two-stage carrier phase recovery (CPR) for 256QAM coherent optical receivers, discussing the optimization of algorithms and trade-offs between energy per bit and SNR penalty. It shows that achieving energy dissipation around 1 pJ/bit at an SNR penalty of 0.6 dB is possible with specific implementations, with PCPE+BPS being the preferred choice due to its smaller area.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Christian Dorize, Sterenn Guerrier, Elie Awwad, Haik Mardoyan, Jeremie Renaudier
Summary: In the past decade, coherent technology has been developed for transmission over core optical networks, leveraging fiber capacity through the use of polarization diversity I/Q modulation and advanced signal processing. Recently, Distributed Acoustic Sensing (DAS) over telecom infrastructure has gained interest, and this paper shows that the combination of coherent solutions and digital processing techniques in current transceiver systems can greatly improve DAS technology by enhancing key performance parameters and coexistence with data traffic.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Takayuki Kobayashi, Junho Cho, Marco Lamponi, Guilhem De Valicourt, Christopher R. Doerr
Summary: The advancement of digital coherent technologies has increased system capacity per single-core single-mode fiber, approaching the Shannon limit, but extending optical bandwidth is necessary for increasing energy efficiency and reducing system complexity.
PROCEEDINGS OF THE IEEE
(2022)
Article
Engineering, Electrical & Electronic
Mandeep Singh, Maninder Lal Singh, Rajandeep Singh, Hardeep Kaur, Priyanka Chohan
Summary: This study investigates the performance of a high-speed spectrally efficient UWOC link using polarization division multiplexing and spatial diversity techniques. The results show that with 3 x 3 repetition coding multiple-input multiple-output configuration, the link length can be extended to 215 m in pure seawater, and there is a 5.02 dBm received power improvement compared to single-input single-output configuration.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Instruments & Instrumentation
Damian Kuznar, Robert Szczygiel, Piotr Maj, Anna Koziol
Summary: We have designed a scalable processor that can provide artificial neural network functionality and developed tools for automatic conversion of ANN models from TensorFlow to HDL code. The hardware, described in SystemVerilog, allows the processor to perform neural network calculations at a speed exceeding 100 MHz. Our software tool supports the translation of multilayer perceptron neural networks into state machine modules and can be dynamically reconfigured. The project aims to implement energy estimation for X-ray photons at the pixel level with higher accuracy than an ADC converter.
JOURNAL OF INSTRUMENTATION
(2023)
Article
Instruments & Instrumentation
Yuan Xiao, Huaguo Liang, Liyu Jin, Yuchuan Wang, Zhiwei Shao, Yue Wang, Yingchun Lu
Summary: In this study, a new dual-edge TDL structure is proposed to improve the performance of TDC. By improving the original pulse-holding circuit and using an enhanced sampling sequence circuit, the proposed scheme achieves good results in terms of resolution and accuracy.
JOURNAL OF INSTRUMENTATION
(2023)
Article
Engineering, Electrical & Electronic
Omaro Fawzi Abdelhamid Gonem, Roger Philip Giddings, Jianming Tang
Summary: Hybrid OFDM-DFMA PONs provide a cost-effective solution for next-generation optical and 5G networks. This paper investigates the impact of DAC/ADC timing jitter on performance and introduces a DSP-based technique to mitigate the effects and reduce optical power penalties, ultimately reducing implementation costs.
IEEE PHOTONICS JOURNAL
(2021)
Article
Instruments & Instrumentation
A. Sebastian-Lombrana, L. Ortiz, J. P. Brito, J. Saez de Buruaga, R. J. Vicente, R. B. Mendez, R. Artinano, V. Martin
Summary: This paper presents the Quantum Communications Lab that took place at the 6th INFIERI Summer School in 2021, which is an example of teaching quantum communication. It highlights the importance of utilizing participants' different technical and engineering backgrounds as well as other technological resources, with a focus on the access to the Madrid Quantum Communication Infrastructure (MadQCI) in the lab.
JOURNAL OF INSTRUMENTATION
(2023)
Article
Engineering, Electrical & Electronic
Ryo Koma, Masamichi Fujiwara, Ryo Igarashi, Kazutaka Hara, Jun-Ichi Kani, Tomoaki Yoshida
Summary: This paper presents a new data-aided carrier frequency offset (CFO) estimation and compensation method for m-array phase shift keying (m-PSK) signals in burst-mode digital coherent reception. The key contributions of this method are the use of specially designed training symbols (TS) and a vector summation based feed-forward CFO estimation algorithm. Simulation and experimental results show that the proposed method has a wide CFO estimation range and high sensitivity detection for long-reach and high splitting ratio optical access.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Guangyi Li, Difei Shi, Xiangyan Meng, Lu Wang, Ming Li, Ninghua Zhu, Wei Li
Summary: A photonic method utilizing a dual-polarization dual-parallel Mach-Zehnder Modulator (DP-DPMZM) is proposed and experimentally verified to generate dual-band microwave waveforms with simultaneous and different formats. The DP-DPMZM consists of four sub-MZMs driven by two independent RF signals and two independent baseband signals. After photo-detection, the two baseband signals are up-converted into two different higher frequency bands. This method allows for independent tunability of the central frequencies and modulation formats of waveforms at two frequency bands, enabling diverse applications in radar and communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Camila Costa, Lucio Borges, Rafael A. Penchel, Marcelo L. F. Abbade, Elias Giacoumidis, Jinlong Wei, Jose A. de Oliveira, Mirian Santos, Shi Li, Andre Richter, Jorge D. Marconi, Julian L. Pita, Ivan Aldaya
Summary: This paper proposes and analyzes the clustering of both polarizations in dual-polarization 16-ary quadrature amplitude modulation (DP-16QAM) to address the effects of self-phase modulation and cross-phase modulation. Simulation results show that processing the two polarizations significantly improves the performance of nonlinear compensation. Thus, the proposed 4D clustering enables range extensions of 13.6 km and 9 km for target bit error ratios of 10-3 and 10-2, respectively. This range extension requires approximately 8000 symbols and 5632 operations, which can be parallelized, requiring just 19 sequential operations.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Optics
Mandeep Singh, Maninder Lal Singh, Rajandeep Singh
Summary: This paper proposes a system for high-speed and reliable wireless optical communication underwater, achieving a data rate of 112 Gbps. The use of MIMO techniques improves the transmission range and power budget.
Article
Nanoscience & Nanotechnology
Vito Sorianello, Alberto Montanaro, Marco Angelo Giambra, Nadia Ligato, Wolfgang Templ, Paola Galli, Marco Romagnoli
Summary: Optical communication is expanding from long distance links to chip-to-chip interconnections to meet the increasing demand for higher bandwidth. Next-generation transceivers aim for high bandwidth, energy efficiency, compact size, and low cost, with silicon photonics expected to play a crucial role. However, silicon modulators have limitations in terms of bandwidth and size. This work presents a graphene photonics I/Q modulator based on four graphene on silicon electro-absorption modulators, enabling advanced modulation formats and demonstrating quadrature phase shift keying (QPSK) modulation up to 40 Gb/s.
Article
Computer Science, Hardware & Architecture
M. Iqbal, L. Velasco, N. Costa, A. Napoli, J. Pedro, M. Ruiz
Summary: This paper proposes a secure cryptographic solution called Light Path SECurity (LPsec) for optical connections, providing high-speed rates and sufficient security level through fast data encryption and key exchange methods.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2022)
Article
Engineering, Electrical & Electronic
Yu Wang, Srivathsa Bhat, Netsanet Tessema, Rafael Kraemer, Antonio Napoli, Giovanni Delrosso, Nicola Calabretta
Summary: An ultrawide-band, polarization insensitive arrayed waveguide grating has been designed and realized, which can be used as a demultiplexer and multiplexer in photonic integrated circuits. Experimental results show its high performance in terms of insertion losses, cross-talk, polarization dependent loss, and polarization dependent wavelength shift.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Dave Welch, Antonio Napoli, Johan Back, Sanketh Buggaveeti, Carlos Castro, Aaron Chase, Xi Chen, Vince Dominic, Thomas Duthel, Tobias A. Eriksson, Sezer Erkilinc, Peter Evans, Chris R. S. Fludger, Ben Foo, Thomas Frost, Paul Gavrilovic, Steven J. Hand, Aditya Kakkar, Ales Kumpera, Vikrant Lal, Robert Maher, Fabio Marques, Fady Masoud, Atul Mathur, Ray Milano, Miguel Iglesias Olmedo, Magnus Olson, Don Pavinski, Joao Pedro, Amir Rashidinejad, Parmijit Samra, Warren Sande, Azmina Somani, Han Sun, Norman Swenson, Huan-Shang Tsai, Amin Yekani, Jiaming Zhang, Mehrdad Ziari
Summary: The deployment of end-to-end solutions across multi-domains in optical networks has been hindered by various factors. Coherent transceivers based on digital subcarrier multiplexing (DSCM) are proposed to address these issues and improve the flexibility, scalability, and adaptability of optical networks. DSCM allows for the design of high-capacity point-to-point and point-to-multipoint optical networks, simplified aggregation with passive optics, and connections between low- and high-speed transceivers. Furthermore, DSCM-based networks reduce the number of opto-electro-opto stages, halve the number of bookended transceivers, and better suit existing traffic patterns in fast-growing and dynamic access/metro segments. Experimental results of coherent point-to-multipoint transceivers are presented, highlighting the potential of DSCM-based solutions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Matheus Sena, Pratim Hazarika, Caio Santos, Bruno Correia, Robert Emmerich, Behnam Shariati, Antonio Napoli, Vittorio Curri, Wladek Forysiak, Colja Schubert, Johannes K. K. Fischer, Ronald Freund
Summary: Efficient anomaly detection schemes are crucial for autonomous optical networks. Receiver-based digital signal processing can help locate defective devices and monitor network performance. This study explores the benefits of utilizing DSP-based longitudinal power estimation and wavelet-denoising tools for anomaly detection.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Computer Science, Hardware & Architecture
Lareb Zar Khan, Joao Pedro, Nelson Costa, Lorenzo De Marinis, Antonio Napoli, Nicola Sambo
Summary: This paper investigates a variational-autoencoder-based data augmentation technique to improve data quality in the training of neural networks for failure management in optical networks. The generated synthetic data are shown to reduce imbalanced datasets, decrease training time, computational complexity, and improve classification accuracy.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Computer Science, Hardware & Architecture
D. Sequeira, M. Ruiz, N. Costa, A. Napoli, J. Pedro, L. Velasco
Summary: In this work, we propose OCATA, a deep-learning-based digital twin for optical time domain, which can be used for automation and fault management in optical transport networks. OCATA models optical links and nodes using deep neural networks, enabling representation of lightpaths. It models linear and nonlinear noise, as well as optical filtering, and extracts useful lightpath metrics. OCATA exhibits low complexity, making it suitable for real-time applications. Illustrative results show remarkable accuracy in disaggregated and mixed disaggregated-proprietary optical network scenarios.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Computer Science, Hardware & Architecture
Pablo Pavon-Marino, Nina Skorin-Kapov, Antonio Napoli
Summary: In this paper, the novel problem of dimensioning optical networks with digital subcarrier-based point-to-multipoint coherent transceivers is investigated, known as tree-determination, routing, and spectrum assignment (TRSA). A heuristic algorithm is proposed to solve the TRSA problem with and without fault tolerance for arbitrary network topologies. The cost benefits of using point-to-multipoint transceivers are evaluated in a case study, showing significant savings in transceiver cost and equipment, although with increased spectrum occupation.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Computer Science, Hardware & Architecture
Mohammad Mohammad Hosseini, Joao Pedro, Antonio Napoli, Nelson Costa, Jaroslaw E. Prilepsky, Sergei K. Turitsyn
Summary: This paper proposes an integer linear programming framework for optimizing multi-period planning of metro-aggregation networks. Using point-to-multipoint coherent pluggable transceivers and a filterless line system architecture, the planning strategies aim to minimize capital expenditure caused by transceiver cost while considering operational expenses. The results show significant reductions in transceiver cost and operational expenses compared to the point-to-point approach.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Computer Science, Hardware & Architecture
Carlos Castro, Antonio Napoli, Mario Porrega, Johan Back, Amir Rashidinejad, Marco Quagliotti, Emilio Riccardi, David Hillerkuss, Amin Yekani, Fady Masoud, Atul Mathur, Joao Pedro, Bernhard Spinnler, Sezer Erkilinc, Aaron Chase, Tobias A. Eriksson, Dave Welch
Summary: Metro aggregation is a rapidly growing segment in the telecommunications industry, requiring high capacity and low cost solutions at the intersection of core and access. This study examines Telecom Italia Mobile's metro aggregation networks and optimizes their design and planning. By comparing traditional point-to-point and digital subcarrier-based coherent modules, we find that the flexibility of the latter leads to significant cost savings in network deployment.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Chemistry, Analytical
Masab Iqbal, Luis Velasco, Marc Ruiz, Nelson Costa, Antonio Napoli, Joao Pedro, Jaume Comellas
Summary: New 5G and beyond services require innovative solutions in optical transport to improve efficiency, flexibility, and cost-effectiveness. Optical point-to-multipoint (P2MP) connectivity is proposed as an alternative to reduce capital and operational expenditures. This paper introduces optical constellation slicing (OCS) as a technology that enables efficient communication between source and multiple destinations. Simulation results show that OCS and digital subcarrier multiplexing (DSCM) provide good performance in terms of BER. A quantitative study demonstrates that OCS and DSCM offer better efficiency and cost savings compared to traditional optical P2P connectivity.
Article
Engineering, Electrical & Electronic
Md Sabbir-Bin Hossain, Georg Boecherer, Talha Rahman, Tom Wettlin, Nebojsa Stojanovic, Stefano Calabro, Stephan Pachnicke
Summary: This article extensively compares uniform 8-ary pulse amplitude modulation (PAM) with probabilistic shaping (PS) PAM-8 using different Maxwell-Boltzmann distributions. The results show that, in the presence of linear equalization, PS-PAM-8 outperforms uniform PAM-8 in terms of bit error ratio, achievable information rate, and operational net bit rate, indicating high tolerance against nonlinearities. The focus of this paper is on O-band electro-absorption modulated laser unamplified IM/DD systems operated close to the zero dispersion wavelength.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Christian Bluemm, Bo Liu, Bing Li, Talha Rahman, Md Sabbir-Bin Hossain, Maximilian Schaedler, Ulf Schlichtmann, Maxim Kuschnerov, Stefano Calabro
Summary: In this article, the challenges and options for scaling IM/DD transceivers towards 800 Gbps are discussed. The focus is on CWDM4 PAM4 transmission over a target distance of 10 km in O-band. Chromatic dispersion (CD) is identified as the main challenge, which can be mitigated through digital signal processing. The use of neural network equalization and magnitude weight pruning can significantly reduce hardware complexity without performance loss.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Nebojsa Stojanovic, Lin Youxi, Talha Rahman, Stefano Calabro
Summary: This study explores the soft information quality of different DSP schemes and the performance of hybrid soft/hard decision FEC. Through simulations and experiments, it is shown that BCJR outperforms DFE by providing superior soft information, leading to significant gains.
2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC
(2023)
Proceedings Paper
Optics
Pablo Pavon-Marino, Nina Skorin-Kapov, Antonio Napoli
Summary: This paper presents the first generalized dimensioning algorithm for optical networks with subcarrier-based Point-to-Multipoint (P2MP) coherent transceivers, covering hub-spoke determination, transceiver allocation, along with light-tree routing and spectrum assignment in arbitrary topologies. The benefits of using P2MP optics in a metro-network case study are evaluated.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)
Proceedings Paper
Optics
Rasoul Sadeghi, Bruno Correia, Nelson Costa, Joao Pedro, Antonio Napoli, Vittorio Curri
Summary: This study investigates the impact of different multi-band approaches on network capacity and device count (including amplifiers and interfaces), highlighting the trade-off between exploiting part of the S-band and extending C+L-band systems.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)