Ahmad W. Mohammad

ORCID: 0009-0009-6723-5393
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Advanced Photonic Communication Systems
  • Photonic and Optical Devices
  • Advanced Fiber Laser Technologies
  • Optical Network Technologies
  • Antenna Design and Optimization
  • Millimeter-Wave Propagation and Modeling
  • Advanced SAR Imaging Techniques

LioniX (Netherlands)
2020-2024

This paper presents the design, fabrication, and characterization of first photonic-assisted receiver module for a Scan-on-Receive synthetic aperture radar (SCORE-SAR) intended Earth observation from space. The is hybrid photonic integrated circuit (PIC) that designed to do precise continuous beamforming-on-receive wideband signals 12 antenna elements array, synthesizing up three simultaneous beams. PIC also implements frequency-agnostic down-conversion so synthesized beams can be directly...

10.1109/jlt.2023.3318473 article EN cc-by-nc-nd Journal of Lightwave Technology 2023-09-22

Synthetic aperture radar is a remote sensing technology finding applications in wide range of fields, especially related to Earth observation. It enables fine imaging that crucial critical activities, like environmental monitoring for natural resource management or disasters prevention. In this picture, the scan-on-receive paradigm allows enhanced capabilities thanks swath observations at finer azimuthal resolution achieved by beamforming multiple simultaneous antenna beams. Recently,...

10.1109/jlt.2021.3119225 article EN publisher-specific-oa Journal of Lightwave Technology 2021-10-11

Abstract High‐throughput satellite (HTS) is an ideal way to realize cross‐regional massive, multifaceted digital exchange services, and it requires a signal processing module that can be massively multiplexed has high flexibility. Due the limitations of frequency characteristics, microwave integrated circuits are difficult meet this requirement. One solution problem photonic (PICs). However, full‐size PIC payloads containing main optoelectronic components extremely challenging implement on...

10.1002/lpor.202200952 article EN Laser & Photonics Review 2023-11-20

This paper reports the first-ever beamforming demonstration of a hybrid photonic integrated circuit operating as RF down-converter based on an optical Blass-matrix architecture for Scan-on-Receive synthetic aperture radar intended Earth observation from space.

10.1364/ofc.2024.m4j.7 article EN Optical Fiber Communication Conference (OFC) 2022 2024-01-01

This paper reports the first-ever demonstration of a multibeam optical beamforming based on Blass matrix implemented in hybrid photonic integrated circuit. The architecture serves as Scan-on-Receive synthetic aperture radar for Earth observation.

10.1364/cleo_si.2024.sm2m.3 article EN 2024-01-01

This paper presents the design and performance analysis of a photonics-based beamformer for spaceborne synthetic aperture radar implementing scan-on-receive functionality. The considered device is hybrid photonic integrated circuit composed actives in InP passives TriPleX™, realizing fast beamforming three receiver beams out 12 radio-frequency input signals providing their simultaneous down-conversion to intermediate frequency. considers as main indicators gain, noise figure, dynamic range...

10.23919/mwp48676.2020.9314435 article EN 2020-11-24

Synthetic Aperture Radar (SAR) is a well-known technique for remote sensing applications with great advantages like uninterrupted imaging capabilities even at night or in presence of cloud cover. However, spaceborne SAR sensors face major challenges cost and size, which are among the barriers against their applicability future constellations low-Earth observation applications. not compact require large medium-sized satellites weighting hundred kilograms more, hundreds million dollars. To...

10.1117/12.2601247 article EN International Conference on Space Optics — ICSO 2020 2021-06-11

Here, we demonstrate a hybrid integrated photonic satellite repeater with large-scale multiplexing potential and high flexibility. Hybrid integration of InP/Si3N4 external cavity laser, arrayed InP modulators semiconductor optical amplifier (SOAs), as well multifunctional Si3N4 signal processors, to fulfill 1x4 Ka-band module on-chip frequency down-conversion outstanding narrowband channelization. Combined the full-chip repeater, broadband, highly integrated, cost-effective communications...

10.1109/mwp58203.2023.10416567 article EN 2023-10-15
Coming Soon ...