Beam Steering and Divergence Control Using Variable Focus Liquid Lenses for WDM FSO Communications

Optical beam steering and divergence control is a critical function in free-space optical (FSO) communications. Variable focus liquid lenses (VFLLs) can be used for simultaneous realization of beam steering and adaptive beam divergence control. Two off-axis VFLLs are employed to steer the optical be...

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Bibliographic Details
Published in:IEEE photonics technology letters 2022-11, Vol.34 (22), p.1226-1229
Main Authors: Mai, Vuong, Kim, Hoon
Format: Article
Language:English
Subjects:
adaptive beam divergence control
Adaptive control
Adaptive optics
Beam steering
Free-space optical (FSO) communications
Free-space optical communication
Lenses
optical beam steering
Optical beams
Optical fibers
Optical transmitters
Wavelength division multiplexing
wavelength-division multiplexing (WDM)
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Summary:Optical beam steering and divergence control is a critical function in free-space optical (FSO) communications. Variable focus liquid lenses (VFLLs) can be used for simultaneous realization of beam steering and adaptive beam divergence control. Two off-axis VFLLs are employed to steer the optical beam in 2 dimensional directions, while one on-axis VFLL adjusts the beam divergence adaptively to channel conditions. This VFLL-based system has been studied only for single-wavelength FSO communications. In this letter, we explore the possibility of using the VFLL-based system for wavelength-division-multiplexed (WDM) FSO communications. For this purpose, we investigate the wavelength dependence of VFLL-based optical beam steering and divergence control through experiment and theory. We also demonstrate the transmission of 4\times 10 -Gb/s WDM signals over a 104-m FSO link.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2022.3210024