Results 21 to 30 of about 4,667 (157)
Large-Scale Integrated Multi-Lines Optical Phased Array Chip
IEEE Photonics Journal, 2020 We design and integrate four optical phased arrays (OPAs) in a single chip. Each OPA possesses different output grating period. Furthermore, we use optical switches to select one or more OPAs for beam scanning. We demonstrate the longitudinal scanning by
Lan-Xuan Zhang +11 more
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Internally sensed optical phased array
Optics Letters, 2013 Extending phased array techniques to optical frequencies is challenging because of the considerably smaller wavelengths and the difficulty of stabilizing the optical path lengths of multiple emitters to this level of precision. This is especially true under real-world conditions where thermal and vibrational disturbances cause path length variations ...
Bowman, David J +7 more
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Silicon Ribbon-Based Dual-Beam Optical Phased Array with Low Crosstalk and Large FoV
Applied Sciences, 2022 In this paper, a silicon ribbon (SR)-based microstructure is developed and added to a 32-channel optical phased array (OPA) to reduce the crosstalk between the antennas of grating waveguides.
Hsun-Yuan Chi +4 more
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Applied Sciences, 2023 By introducing the arrayed waveguide router (AWGR) optical true time-delay (OTTD) architecture in bent-pipe satellite optical inter-link to optically assist the RF phased array in Low-earth orbit satellites will extend the multi-hop bent-pipe satellite ...
Shiyi Xia +7 more
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First Demonstration of Dynamic High-Gain Beam Steering With a Scanning Lens Phased Array
IEEE Journal of Microwaves, 2022 We report on the first demonstration of dynamic beam steering using a scanning lens phased array. A scanning lens phased array relies on a combination of mechanical and electrical phase shifting to dynamically steer a high-gain beam beyond the grating ...
Sjoerd Bosma +4 more
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FSO Receiver With Adaptive Alignment Based on Pure Phased Holographic Imaging
Frontiers in Physics, 2021 This paper proposes a free space optical communication (FSO) receivier system with adaptive alignment based on pure phase holographic imaging. During the frame header transmission period, the optical phased array in this system performs specific ...
Haibo Wang, Zaichen Zhang, Yidi Zhang
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Optical phased array power penalty analysis
Optics Express, 2007 This paper investigates the power penalty from optical phased arrays used for wide-angle beam steering of optical communication signals. The analysis studies the effect of aperture size, data rate, modulation format, and diffraction angle on digital lightwave signals.
Jing M, Tsui +2 more
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Non-redundant optical phased array
Optica, 2021 Optical phased arrays (OPAs) are promising beam-steering devices for various applications such as light detection and ranging, optical projection, free-space optical communication, and optical switching. However, previously reported OPAs suffer from either an insufficient number of resolvable points, or complicated control requirements due to an ...
Taichiro Fukui +6 more
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Design of a Low-Crosstalk Sub-Wavelength-Pitch Silicon Waveguide Array for Optical Phased Array
IEEE Photonics Journal, 2021 In this work, a compact sub-wavelength-pitch silicon waveguide array with low crosstalk is proposed and analyzed. The crosstalk is suppressed by periodic silicon nano-blocks symmetrically arranged along the silicon strip waveguides.
Guangzhu Zhou +3 more
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Photonic Approach to Phased Array Application [PDF]
Radioengineering, 2021 Many applications, including phased array antennas, require a significant and tunable time delay, which pure electrical methods cannot establish. A variable microwave true-time delay line utilizing a photonic approach is presented in this paper.
E. Udvary
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