Article
Engineering, Electrical & Electronic
Shemsi Shaqiri, Shyqyri Haxha, Ian Flint, Huseyin Ademgil
Summary: In this paper, a novel Microwave Photonics Analog Link (MPAL) system configuration is proposed for high-speed Radio over Fibre (RoF) transmissions. The system configuration eliminates intermodulation distortions and harmonic distortions, uses fewer RF shifters, and is easy to implement. The proposed system, with high spurious free dynamic range, would have a significant impact on future aerospace, radar, defense and satellite-to-ground downlink communication systems applications.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Heidar Keshavarz, S. Esmail Hosseini, Kambiz Jamshidi, Dirk Plettemeier
Summary: In this paper, an integrated microwave photonic reconfigurable mixer, phase shifter, and frequency doubler based on silicon photonics platform is proposed and theoretically investigated. The structure consists of a novel DDMZM and PM, and can be configured for various functions such as phase tunable mixing, double-balanced mixing, up-converting, down-converting, RF frequency doubling, and phase shifting by adjusting optical wavelength and choosing the proper RF hybrid coupler. The proposed structure is theoretically analyzed and verified through simulations.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Taimur Nazir Mirza, Shyqyri Haxha, Iyad Dayoub
Summary: An improved linearized analog microwave photonic link (AMPL) with a significant multioctave bandwidth performance is experimentally presented in this study. The system configuration is designed to process a carrier suppressed double-sideband signal through the link, demonstrating a fundamental signal to interference ratio of 60 dB. The use of gallium arsenide (GaAs) modulators instead of lithium niobate (LiNbO3) modulators provides better system stability and performance in harsh operating environments.
IEEE SYSTEMS JOURNAL
(2021)
Article
Optics
Christian Bohley, Vakhtang Jandieri, Benjamin Schwager, Ramaz Khomeriki, Dominik Schulz, Daniel Erni, Douglas H. Werner, Jamal Berakdar
Summary: The thickness-dependent multimodal nature of three-dimensional coupled photonic crystal waveguides is investigated for the formation of controlled optical gap solitons. Both linear and nonlinear behaviors are studied, revealing the spectral properties and temporal solitons associated with crystal thickness.
Article
Engineering, Electrical & Electronic
Abdelrahman H. Ahmed, Leonardo Vera, Lorenzo Iotti, Ruizhi Shi, Sudip Shekhar, Alexander Rylyakov
Summary: Supporting advanced modulation schemes, an automatically reconfigurable transimpedance amplifier reduces noise and total harmonic distortion, while introducing a collaborative offset and dc current cancellation technique to protect the receiver. In a prototype fabricated on a 130-nm SiGe BiCMOS process, the RX achieves a maximum gain of 75.5 dB Omega, dynamic range of 35.5 dB, and 42-GHz bandwidth. The silicon-photonic transceiver assembly, incorporating four such RXs, achieves a required ROSNR of 25 dB for received optical power and an aggregate data rate of 528 Gb/s/lambda at 66 Gbaud.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2023)
Article
Engineering, Electrical & Electronic
M. Botella-Campos, J. Mora, B. Ortega
Summary: This article presents a theoretical and experimental analysis of the mmW signal gain observed in photonically generated signals by using carrier suppressed external modulation in a centralized network architecture. The quantitative results demonstrate the importance of proper system conditions in exploiting the mmW signal gain for the future deployment of high energy efficient networks.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jeffrey Rodriguez, Michael J. Benker, Jason Poirier, Robert Dougenik, Yifei Li
Summary: The paper proposes a coherent amplitude-modulated link with optical down-conversion, achieving high dynamic range by utilizing a receiver with balanced detection and digital linearization. Experimental results demonstrate notable dynamic range enhancements in down-conversion RF photonic links compared to prior arts.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Dinka Milovancev, Nemanja Vokic, David Loschenbrand, Thomas Zemen, Bernhard Schrenk
Summary: The study presents a mobile fronthaul methodology for analogue optical transmission of native radio signals with integrated photonic true-time delay for beam steering of phased-array antennas. Using laser-based coherent homodyne detectors and delay dissemination through ultra-dense wavelength division multiplexing ensures low complexity at the optical layer. Experimental results verify successful native radio signal transmission over a 14.3-km coherent optical fronthaul with low end-to-end error vector magnitude.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2021)
Article
Optics
Yiran Gao, Hao Chi, Jian Dai, Kun Xu
Summary: We present and experimentally verify a photonic down-conversion link for Ku-band based on coherent in-phase/quadrature (I/Q) image rejection and digital nonlinear compensation. The image-rejection ratio at 17.5 GHz is measured to be 47 dB. After digital processing, the image intermodulation distortions (MMD) and the intermodulation distortions (IMD3) are suppressed by 18.1 dB and 10.9 dB, respectively. The corresponding spurious-free dynamic range (SFDR) reaches 108.83 dB center dot Hz2/3.
Article
Optics
Yiran Gao, Hao Chi, Jian Dai, Kun Xu
Summary: In this study, a Ku-band photonic down-conversion link based on coherent I/Q image rejection and digital nonlinear compensation is demonstrated and experimentally verified. The image-rejection ratio at 17.5 GHz is measured to be 47 dB. After digital processing, the image intermodulation distortions (MMD) and the intermodulation distortions (IMD3) are suppressed by 18.1 dB and 10.9 dB, respectively. The corresponding spurious-free dynamic range (SFDR) reaches 108.83 dB center dot Hz(2/3).
Article
Optics
S. V. Vinodhini, S. Piramasubramanian, M. Ganesh Madhan, M. Sandhiya
Summary: A Schottky diode based linearization network is introduced for distortion reduction in 1.3 mu m Transistor Laser for the first time. By using predistortion techniques, significant improvement in intermodulation distortion and bandwidth can be achieved.
Article
Engineering, Electrical & Electronic
Stephen R. Anderson, Amir Begovic, Z. Rena Huang
Summary: An integrated RF-photonic link using a slow-light enhanced silicon electro-optic modulator, a single mode Si optical waveguide, and a silicon-germanium photodetector was fabricated. By optimizing the parameters of the Si Mach-Zehnder modulator, high SFDR and modulation efficiency were achieved in the slow-light region.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Shuhei Amakawa, Ryotaro Sugimoto, Korkut Kaan Tokgoz, Sangyeop Lee, Hiroyuki Ito, Ryoko Kishikawa
Summary: This paper develops a signal flow graph (SFG) representation of the small-signal responses of nonlinear microwave circuits using X-parameters. It emphasizes the inclusion of negative-frequency nodes and unravels the circuit-operational meaning of T-type small-signal X-parameters. The SFG is used to derive a closed-form expression of the amplifier output power in terms of the load reflection coefficient and plot load-pull power contours.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Optics
Cong Ma, Xiangchuan Wang, Yue Yang, Zeyong Ding, Shilong Pan
Summary: This paper proposes a novel method for generating coherent and wideband stepped-frequency waveforms using recirculating microwave photonic frequency conversion. The proof-of-concept experiment demonstrates the feasibility and stability of the method, and generates stepped-frequency signals with different frequency intervals and bandwidths.
Article
Physics, Applied
A. R. Medema, G. Ghigo, S. K. Remillard
Summary: It is found from the research that intermodulation distortion of microwave signals incident upon a superconducting sample relaxes with the relaxation of sample magnetization, and the presence of defects influences the relaxation process of IMD.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Josep M. Fabrega, Raul Munoz, Laia Nadal, Carlos Manso, Michela Svaluto Moreolo, Ricard Vilalta, Ricardo Martinez, Francico Javier Vilchez, Diego Perez Galacho, Salvador Sales, Evangelos Grivas, Jaroslaw P. Turkiewicz, Simon Rommel, Idelfonso Tafur Monroy
Summary: An experiment showcasing a 5G digital fronthaul network utilizing multi-adaptive bandwidth/bitrate variable transceivers and an autonomic SDN control system for partially-disaggregated WDM/SDM. The SDN controller assigns optimal constellation based on per-subcarrier SNR to achieve EVM below 2.1%.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2021)
Article
Optics
Erica Sanchez, Daniel Perez-Lopez, Diego Perez-Galacho, Tan Huy-ho, David Wessel, Jose Capmany
Summary: We present an end-to-end analytic model for calculating the figures of nerit (FOMs) of arbitrarily filtered and amplified heterodyne coherent microwave photonics (MWP) links. This model is applicable to evaluating the performance of complex systems, particularly in the final stage of radio frequency (RF) signal conversion. We apply this model to a specific case in the 5G link, representing the front-haul segment between the central office and the base station. It is expected to serve as a useful and efficient tool for analyzing various cases combining fiber and photonic chip elements during the design stage.
Editorial Material
Engineering, Electrical & Electronic
Jose Capmany, Christina Lim, Kazutosi Kato, Patrick Runge, Andreas Beling
Summary: The papers in this special section focus on optical detectors and the conversion from photons to electrons, which is a crucial operation in photonic systems. The development in the past five decades, especially based on heterostructures, quantum wells, and uni-carrier operation, has yielded impressive results in terms of bandwidth, noise, and footprint.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
News Item
Optics
Jose Capmany, Daniel Perez-Lopez
Summary: Controlling the refractive index of BaTiO3 thin films through ferroelectric domain switching controlled by electrical pulses is now possible. A device based on this material has been introduced for implementing low-power, high-speed and CMOS-compatible programmable phase shifters in silicon photonic chips.
Article
Optics
Elham Nazemosadat, Sergi Garcia, Ivana Gasulla
Summary: A novel microwave frequency measurement scheme using a heterogeneous multicore fiber is demonstrated. The scheme utilizes the different relative group delays among the cores of the fiber to construct microwave filters with different free spectral ranges, and the ratio of their frequency response traces is used for measurement. By varying the operational wavelength, different measurement curves are obtained, enhancing the accuracy of the measurement.
Article
Optics
Mario Urena, Sergi Garcia, Jose Herranz, Ivana Gasulla
Summary: Phased array antenna beam-steering in high radiofrequency bands is crucial for upcoming 5G and Beyond wireless communication systems. This paper presents the experimental demonstration of tunable optical beamforming using dispersion-diversity multicore optical fiber. Continuous 1D beam-steering is achieved by varying the operating optical wavelength. The demonstrated optical beamforming offers flexibility, versatility, capacity, and connectivity with reduced size, weight, and power consumption.
Article
Nanoscience & Nanotechnology
Sergi Garc ia, Mario Uren, Ivana Gasulla
Summary: Multicore optical fibers play a crucial role in high-capacity communication networks and offer advantages in optical and microwave signal processing. By tailoring the refractive index profile of each core, parallel signal processing can be achieved. A novel multicore fiber was experimentally demonstrated for reconfigurable signal processing, showing advantages in microwave signal filtering.
Article
Optics
Xiangzhi Xie, Guchang Chen, Feifei Yin, Kun Xu, Jose Capmany, Yitang Dai
Summary: A time reversal method for broadband microwave signals based on frequency conversion of multiple subbands is proposed and experimentally demonstrated. The input spectrum is divided into narrowband subbands and the center frequency of each subband is reassigned using multiheterodyne measurement. The system achieves both spectral inversion and time reversal of the input waveform. Mathematical derivation and numerical simulation support the equivalence between time reversal and spectral inversion in this system. Experimental results also show successful spectral inversion and time reversal of a broadband signal with instantaneous bandwidth larger than 2 GHz. The proposed solution shows promise for integration without dispersion elements and is competitive for processing broadband microwave signals.
Article
Engineering, Electrical & Electronic
Sergi Garcia, Mario Urena, Ivana Gasulla
Summary: Multigigabit-per-second photonic-assisted time-interleaved analog-to-digital conversion (ADC) is demonstrated using a dispersion-diversity multicore fiber (MCF) for the first time. The MCF provides tunable true-time delay line operation for the analog signal replicas. By time interleaving 5 digitized channels, continuous real-time ADC tunability with the optical wavelength is achieved, surpassing the sampling rates offered by commercial electronic ADCs. The use of MCFs in photonic-assisted ADCs brings benefits in terms of size, weight, power consumption reduction, system flexibility, and stability improvement, making it relevant for various applications.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Elham Nazemosadat, Jose I. Herranz-Herruzo, Ivana Gasulla
Summary: In this study, we demonstrated, for the first time, the tunable optical beamforming for phased array antennas using a few-mode fiber. The few-mode fiber acted as a continuously tunable true-time delay line, allowing for continuous steering of the beam-pointing angle. This fiber-based beamformer shows potential benefits for next-generation fiber-wireless communications and radar systems in terms of versatility, capacity, size, weight, and power consumption reduction.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Xiangzhi Xie, Jilong Li, Kun Xu, Jose Capmany, Yitang Dai
Summary: This paper proposes a method of compressing LFM signals based on the spectral Talbot effect and demonstrates it through experiments. The method can effectively compress broadband LFM signals with long durations and measure the delay difference between signals.
Proceedings Paper
Nanoscience & Nanotechnology
Sergi Garcia, Mario Urena, Elham Nazemosadat, Ivana Gasulla
Summary: This experiment demonstrates the reconfigurable microwave signal processing using dispersion-diversity multicore fiber, and provides several representative applications including signal filtering, radio beam-steering in phased array antennas, frequency measurement, and arbitrary waveform generation.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
Sergi Garcia, Mario Urena, Ivana Gasulla
Summary: In this study, we propose and experimentally demonstrate photonic temporal differentiation and integration on a customized dispersion-diversity 7-core heterogeneous multicore fiber for the first time. We successfully demonstrate up to 4th-order temporal differentiation and 7-sample temporal integration.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
Proceedings Paper
Optics
Elham Nazemosadat, Ivana Gasulla
Summary: In this study, we demonstrate for the first time the reconfigurable radiofrequency signal processing in a few-mode fiber link, utilizing the modes of the double-clad step-index few-mode fiber to create a tunable 2D sampled true-time delay line.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)
Article
Engineering, Electrical & Electronic
Elham Nazemosadat, Ivana Gasulla
Summary: In this study, we experimentally demonstrate tunable true-time delay line operation over a few-mode fiber link for the first time. The performance of this true-time delay line when applied to microwave signal filtering is also assessed.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
