Metalens wide-angle receiver for free space optical communications

Islam, Shafiqul; Zaman, Imam Uz; Sadri-Moshkenani, Parinaz; Khan, Mohammad Wahiduzzaman; Boyraz, Özdal

doi:10.1117/12.2596325

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Any lenses (metalens/refractive lens) in the receiver aperture focus the incoming optical beam to different locations at the focal plane based on the AoA of the beam. As stated in [4][5][6] this causes problems when there is a vibration on the transmitter and receivers or when alignment between two nodes drifts. Our goal in this paper is to design a system that can accept large variations in the AoAs and focus them all on the same detector spot to accommodate spatial multiplexing of multiple channels.…”

Section: Proposed Systemmentioning

confidence: 99%

Wide field of regard metalens receiver for free space optical communication

Islam,

Boyraz

2023

Current Developments in Lens Design and Optical Engineering XXIV

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In conventional free space optical communication receivers, focusing optics reduces the field of regard (in the range of millidegree) while increasing the power received by the detector. As a result, a receiver communicates with one transmitter at a time. In this paper, we propose a novel two-metalens-receiver system that offers a wider field of regard (in the range of degrees) to capture the optical signal from a large Angle of Arrival (AoA). The first metalens of the system compresses and separates optical beams, based on different incident angles. The compression factor of the first metalens needs to be chosen based on the receiver system's overall length, aperture size, and minimum angular separation between the transmitters. The second metalens redirects and focuses the beam to the detector sitting on the optical axis. Physical Optics calculation with the proposed phase profile as a phase mask shows that our proposed system increases the power received by the detector up to 1000 times compared to the conventional system for large AoA. As a result, transmitters with wide angular (and spatial) separation can communicate with the proposed receiver simultaneously. The designed phase profile is implemented by a meta-unit cell with varying diameters of Si nanopillars sitting on the quartz substrate. Finally, Quasi-3D full wave simulation is carried out to show the effectiveness of the two metalens-receiver systems.

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Section: Proposed Systemmentioning

confidence: 99%

Wide field of regard metalens receiver for free space optical communication

Islam,

Boyraz

2023

Current Developments in Lens Design and Optical Engineering XXIV

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“…Similar to diffractive optics, metasurfaces have shown to have several benefits compared to classical refractive and reflective optics used generally in FSOC 174 . The metasurface technology is maturing rapidly and will enable a lot of new possibilities for FSOC, e.g., compact wide field angle receivers 175 and multiplexing 176 , 177 . The opto-thermo-mechanical behavior of these components and their impact on communication has to be further understood to extend their applicability to satellite terminals in the future.…”

Section: Future Workmentioning

confidence: 99%

Opto-thermo-mechanical phenomena in satellite free-space optical communications: survey and challenges

Badás,

Piron,

Bouwmeester

et al. 2023

Opt. Eng.

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Growing interest in free-space optical communication, due to the high bandwidth and security provided by these links, has generated the necessity of designing high-performance satellite terminals. In order to develop these terminals, the optothermo-mechanical phenomena that appear in the space environment and their effect on optical communication links have to be understood in detail. A review of the opto-thermo-mechanical phenomena occurring in spaceborne terminals is presented, describing the relevance of each of them. The methods found to compute the impact on the communication performance due to opto-thermo-mechanical phenomena are collected by building the bridge between the optical and communication performance parameters. Finally, techniques available to mitigate the detrimental effects of these phenomena are classified, and the relevant research challenges are identified.

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