TRABALHOS PUBLICADOS
2025 |
Proposal for an All-Optical Intra-Pulse Instantaneous Frequency Measurement Proceedings Article Gonçalves, André Paim; Marins, Felipe Araújo; Olivieri, Danilo M.; Ribeiro, Ricardo Marques; Ivo, Felipe Streitenberger; Coutinho, Olympio Lucchini Resumo | Links | BibTeX | Tags: Instantaneous Frequency Measurement (IFM), Instantaneous Wideband, Microwave Photonics @inproceedings{Goncalves2025ProposalAllOptical,This article presents a new concept of Instantaneous Frequency Measurement (IFM) performed at the receiver, which is based on Microwave Photonics. The implementation of IFM has the capability of measuring RF intra-pulse parameters. The proposed optical circuit is based on the concept of optical self-homodyning, where the carrier and one of the sidebands are eliminated. The remaining sideband is inserted into an MZI with arms of different sizes coupled to a low-speed photodetector. This process produces a tone increased by the spectral components of the measured RF signal envelope because of the spectral components of the remaining sideband beating in the photodetector. The proposed optical circuit brings the benefit of employing simpler digitizers, reducing system latency, and has the possibility of being transformed into a photonic integrated circuit (PIC). It was predicted by mathematical deduction, and the concept was experimentally confirmed. |
2021 |
High Sensitivity Long Pulse Envelope Detector Assisted by Microwave Photonics Proceedings Article Gonçalves, André Paim; Ivo, Felipe Streitenberger; Richter, Renan Miranda; Coutinho, Olympio Lucchini Resumo | Links | BibTeX | Tags: Envelope detection, high sensitivity, long pulse, Microwave Photonics @inproceedings{Andr\'{e}2021Envelopeb,This article presents a concept of a long pulse envelope detector (ED) with a high sensitivity value based on Microwave Photonics (MWP). The process of envelope detecting of RF signals is achieved by the translation of the RF spectrum to the optical spectrum range followed by optical filtering to cut the lower sideband and the carrier, finally beating the remaining upper sideband into a low-speed photodetector (LSPD). The LSPD amplified by transimpedance gain. This approach depends only on the RF passing band of the phase modulator (PM) and the optical filter transfer function. This concept is experimentally demonstrated reaching envelope detector tangential signal sensitivity (TSS) values around -40 dBm for RF input frequency range from 10 GHz to 20 GHz. The proposed architecture does not use any optical or video signal amplifier. The implementation of this approach is simple, employs few components, and Commercial off-the-Shelf (COTS). |
2020 |
Microwave photonic Radar Warning Receiver (RWR) airborne antenna over fiber optic Proceedings Article Bastos, Paulo Henrique Kiohara A; Ivo, Felipe Streitenberger; Coutinho, Olympio Lucchini Resumo | Links | BibTeX | Tags: Electronic Warfare, Microwave Photonics, Radar Warning Receiver @inproceedings{Paulo2020Electronicb,Electronic warfare was of great importance mainly in the second world war. Radar was one of the greatest inventions in the area at that time, reinventing the way war was viewed until then. Today, modern combat aircraft have sophisticated warfare systems, one of which is known as the Radar Warning Receiver (RWR), responsible for alert pilots to possible radar detection and guiding the direction in which it is being radiated. Technological the interaction of the Microwave and optoelectronics area, thus emerging an area known as Microwave Photonics (MWP). This article presents a photonic link to replace the copper cables used by RWR systems, thus applying photonic technology in order to improve performance and benefit from the intrinsic characteristics that optical fiber offers to the system, offering a totally passive remote system, where only one phase modulator is connected to the RWR antenna. |