Underwater wireless optical communications: From system-level demonstrations to channel modelling
AuthorsOubei, Hassan M.
Ng, Tien Khee
Ooi, Boon S.
KAUST DepartmentCommunication Theory Lab
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2018-01-09
Print Publication Date2017-11
Permanent link to this recordhttp://hdl.handle.net/10754/626989
MetadataShow full item record
AbstractIn this paper, we discuss about recent experimental advances in underwater wireless optical communications (UWOC) over various underwater channel water types using different modulation schemes as well as modelling and describing the statistical properties of turbulence-induced fading in underwater wireless optical channels using laser beam intensity fluctuations measurements.
CitationOubei HM, Shen C, Park K-H, Kammoun A, Ng TK, et al. (2017) Underwater wireless optical communications: From system-level demonstrations to channel modelling. 2017 22nd Microoptics Conference (MOC). Available: http://dx.doi.org/10.23919/MOC.2017.8244482.
Showing items related by title, author, creator and subject.
Wide-field-of-view optical detectors based on fused fiber-optic tapers for high-speed optical wireless communicationOoi, Boon S.; Alkhazragi, Omar; Trichili, Abderrahmen (SPIE, 2022-05-24) [Conference Paper, Presentation]Optical wireless communication (OWC) is envisioned to become an indispensable technology in future wireless networks. However, one of the main issues hindering the widespread of OWC systems is the strict alignment required to maintain connectivity. This is due to the tradeoff between the receiver’s active area and its response speed, which necessitates the use of a lens to focus the light, limiting the field of view (FOV). Taking inspiration from the wide-FOV eyes of horseflies to address this issue, we propose the use of a convex-surface fused fiber-optic taper (FFOT) that can effectively expand a planar array of photodetectors and project it onto a spherical dome, respectively improving the light collection of individual photodetectors and expanding the overall FOV of the array. In our proof-of-concept demonstration, we show an optical receiver with a FOV semi-angle of around 25° and optical power density gain up to 120 in a 1-GHz link whose bandwidth is limited only by the photodetector. Moreover, reducing of the FOV of each individual fiber that results from tapering and the extra-mural absorption material incorporated around the fibers’ cores reduce the crosstalk between them, preserving the image quality. Therefore, unlike non-imaging light focusing elements, FFOTs can potentially be used in applications in which preserving the image is necessary, such as in imaging multiple-input and multiple-output systems and light detection and ranging (LiDAR). We also show the performance of FFOTs in collecting light from color-converting materials, a technique used in expanding the FOV beyond the étendue limit.
Polarization Micro-Optics: circular polarization from a Fresnel Rhomb 3D printed on an optical fiberBertoncini, Andrea; Liberale, Carlo (IEEE Photonics Technology Letters, Institute of Electrical and Electronics Engineers (IEEE), 2018-09-20) [Article]High resolution fabrication of three dimensional polymeric structures with Direct Laser Writing (DLW) holds a unique potential for the miniaturization of bulk optical elements. This has been so far mainly demonstrated for the fabrication of reflective, refractive and phase-mask micro-optics. Here we show the use of DLW for the fabrication of a miniaturized phase retarder element, a Fresnel Rhomb, which acts as a broadband quarter-wave plate. We show the integration of the Fresnel Rhomb onto a polarization-maintaining optical fiber, converting linearly polarized light from the fiber into circularly polarized light over a very broad spectral range.
Optical force on diseased blood cells: Towards the optical sorting of biological matterGongora, Juan Sebastian Totero; Fratalocchi, Andrea (Optics and Lasers in Engineering, Elsevier BV, 2016-01) [Article]By employing a series of massively parallel ab-initio simulations, we study how optical forces act on biological matter subject to morphological disease. As a representative case study, we here consider the case of Plasmodium falciparum on red blood cells (RBC) illuminated by a monochromatic plane wave. Realistic parameters for the geometry and the refractive index are then taken from published experiments. In our theoretical campaign, we study the dependence of the optical force on the disease stage for different incident wavelengths. We show that optical forces change significantly with the disease, with amplitude variation in the hundreds of pN range. Our results open up new avenues for the design of new optical systems for the treatment of human disease.