Common path-based mobile free-space optical terminal with adaptive beamforming function for Gbps out-of-band full-duplex connectivity to UAVs

Park, Siwoong; Yeo, Chan Il; Heo, Young Soon; Ryu, Jae Hyoung; Kang, Hyun Seo; Kim, Sung Chang; Jang, Jae Won

doi:10.1016/j.optcom.2021.127041

Cited by 7 publications

(17 citation statements)

References 21 publications

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“…The required beam divergence angle to achieve the maximum FSO link distance of 100 m was 1.8 mrad, at which the link range was 55-100 m. With our method, the link range was expanded to 5-100 m by merging the link ranges of 20-110 m at 1.8 mrad and 5-30 m at 6 mrad in our method. The range of 1.8-6 mrad was feasible [13]. The link range at 1.8 mrad and that at 6 mrad had a common range of 10 m, which was much larger than the required value of 0.3 m for maintaining the FSO link while changing the beam divergence angle, so the feasibility was confirmed.…”

Section: B Fso With Moving Antenna On Trainmentioning

confidence: 81%

“…For changing the beam divergence, a beam divergence control component should be added compared with the conventional method. The component is, for example, a simple position controller [13]. If we expand the link range with the conventional method, multiple beam transmitters of different beam divergence angles are needed, which increases the implementation cost and complexity.…”

Section: Adaptive Beam Divergence Controlmentioning

confidence: 99%

“…4, the link range was expanded to 5-200 m by merging the link ranges of 20-200 m at 1 mrad and 5-60 m at 3.4 mrad. 3.4 mrad was the smallest beam divergence angle at which the FSO link could be maintained through the minimum FSO link distance of 5 m. The range of the beam divergence angle of 1-3.4 mrad was feasible according to [13].…”

Section: A Fso With Moving Antenna On Dronementioning

confidence: 99%

“…Because 𝑉 was shorter than that in the previous case, the upper limit of the link range at each beam divergence angle was shorter than that in the previous case. The required beam divergence angle to achieve the maximum FSO [13]. The link range at 0.4 mrad and that at 3.4 mrad had no common range, so the additional angle of 1.8 mrad was utilized, which maximized the minimum of the common range.…”

Section: A Fso With Moving Antenna On Dronementioning

confidence: 99%

See 3 more Smart Citations

Adaptive Beam Divergence for Expanding Range of Link Distance in FSO With Moving Nodes Toward 6G

Harada

Shibata

Kaneko

et al. 2022

IEEE Photon. Technol. Lett.

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Free space optics (FSO) provides high-capacity optical wireless communications. To maintain an FSO link with a moving node, a beam should be steered toward it. As the FSO link distance gets shorter, it becomes difficult to maintain the link. This is because the beam radius has not largely expanded yet at shorter transmission distances and the received optical power decreases as the receiver moves away from the center of the beam. In this paper, we address an adaptive beam divergence control method to expand the range of the FSO link distance within which the FSO link can be maintained. Theoretical evaluation results show our method expanded the minimum FSO link distance to 5 m in assumed use cases, though it was at least 20 m with a fixed beam divergence. Furthermore, we confirmed the range of the beam divergence angle and the divergence changing interval in our method were feasible.

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Section: B Fso With Moving Antenna On Trainmentioning

confidence: 81%

Section: Adaptive Beam Divergence Controlmentioning

confidence: 99%

Section: A Fso With Moving Antenna On Dronementioning

confidence: 99%

Section: A Fso With Moving Antenna On Dronementioning

confidence: 99%

See 2 more Smart Citations

Adaptive Beam Divergence for Expanding Range of Link Distance in FSO With Moving Nodes Toward 6G

Harada

Shibata

Kaneko

et al. 2022

IEEE Photon. Technol. Lett.

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show abstract

“…Previously reported FSO communication systems employing an adaptive beamforming function [ 40 ] demonstrated an improved tracking efficiency between FSO terminals within a limited size, weight, and power (SWaP) value for UAV mounting.…”

Section: Introductionmentioning

confidence: 99%

Tracking Efficiency Improvement According to Incident Beam Size in QPD-Based PAT System for Common Path-Based Full-Duplex FSO Terminals

Park

Yeo

Heo

et al. 2022

Sensors

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Free space optical (FSO) communication can support various unmanned aerial vehicles’ (UAVs) applications that require large capacity data transmission. In order to perform FSO communication between two terminals, it is essential to employ a pointing, acquisition, and tracking (PAT) system with an efficient and optimal performance. We report on the development of a common optical-path-based FSO communication system, tailored for applications in UAVs. The proposed system is equipped with a quadrant photodiode (QPD)-based PAT system without an additional beacon beam subsystem. The presented approach reduced the structural complexity and improved the tracking efficiency for the same size, weight, and power (SWaP). To achieve a robust FSO link in a dynamic UAV environment, the observability and controllability were obtained based on the linearized control according to the incident beam size on the QPD, which was verified by optical simulation and experiments. As a result, the QPD-based PAT system for implementing FSO links demonstrated an up to 4.25 times faster tracking performance. Moreover, the FSO link experimentally confirmed the 1.25 Gbps full-duplex error-free communication at a 50 m distance.

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Beaconless angle-of-arrival tracking with improved receiver sensitivity and tracking precision for free-space optical communications

Mai

Kim

2023

Optics Communications

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Common path-based mobile free-space optical terminal with adaptive beamforming function for Gbps out-of-band full-duplex connectivity to UAVs

Cited by 7 publications

References 21 publications

Adaptive Beam Divergence for Expanding Range of Link Distance in FSO With Moving Nodes Toward 6G

Adaptive Beam Divergence for Expanding Range of Link Distance in FSO With Moving Nodes Toward 6G

Tracking Efficiency Improvement According to Incident Beam Size in QPD-Based PAT System for Common Path-Based Full-Duplex FSO Terminals

Beaconless angle-of-arrival tracking with improved receiver sensitivity and tracking precision for free-space optical communications

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