Alan E. Willner
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View article: Perspective on tailoring longitudinal structured beam and its applications
Perspective on tailoring longitudinal structured beam and its applications Open
Tailoring structured beams with varying lightwave properties along the longitudinal dimension has recently gained much interest. This paper gives a perspective on the advances of longitudinally structured beams, their potential application…
View article: <b>Synthesis of space-time wave packets using correlated frequency comb and spatial field</b>
<b>Synthesis of space-time wave packets using correlated frequency comb and spatial field</b> Open
Shaping transverse degrees of freedom across different temporal frequency spectra has unlocked new possibilities for realizing a wide variety of novel spatiotemporal phenomena. In particular, using the discrete frequencies of optical frequ…
View article: Automatic mitigation of dynamic atmospheric turbulence using optical phase conjugation for coherent free-space optical communications
Automatic mitigation of dynamic atmospheric turbulence using optical phase conjugation for coherent free-space optical communications Open
Coherent detection can provide enhanced receiver sensitivity and spectral efficiency in free-space optical (FSO) communications. However, turbulence can cause modal power coupling effects on a Gaussian data beam and significantly degrade t…
View article: Optically Delaying a Radio Frequency–Linear Frequency-Modulated (RF-LFM) Pulse Using Kerr Comb Carriers and Off-the-Shelf Concatenation of a Linearly Chirped Fiber Bragg Grating and a Chirped-and-Sampled Fiber Bragg Grating
Optically Delaying a Radio Frequency–Linear Frequency-Modulated (RF-LFM) Pulse Using Kerr Comb Carriers and Off-the-Shelf Concatenation of a Linearly Chirped Fiber Bragg Grating and a Chirped-and-Sampled Fiber Bragg Grating Open
We demonstrate a low latency delay of a radio frequency (RF)–linear frequency-modulated (LFM) pulse by modulating it onto optical carriers from a Kerr comb and sending the signal through a concatenation of off-the-shelf linearly chirped fi…
View article: Temporally and longitudinally tailored dynamic space-time wave packets
Temporally and longitudinally tailored dynamic space-time wave packets Open
In general, space-time wave packets with correlations between transverse spatial fields and temporal frequency spectra can lead to unique spatiotemporal dynamics, thus enabling control of the instantaneous light properties. However, spatio…
View article: Efficiently adding mode multiplexing for cost-effective, high-capacity fiber links
Efficiently adding mode multiplexing for cost-effective, high-capacity fiber links Open
Advanced Photonics, co-published by SPIE and Chinese Laser Press, is a highly selective, Gold Open Access, international journal publishing innovative research in all areas of optics and photonics, including fundamental and applied researc…
View article: Temporally and Longitudinally Tailored Dynamic Space-Time Wave Packets
Temporally and Longitudinally Tailored Dynamic Space-Time Wave Packets Open
In general, space-time wave packets with correlations between transverse spatial fields and temporal frequency spectra can lead to unique spatiotemporal dynamics, thus enabling control of the instantaneous light properties. However, spatio…
View article: Roadmap on spatiotemporal light fields
Roadmap on spatiotemporal light fields Open
Spatiotemporal sculpturing of light pulse with ultimately sophisticated structures represents a major goal of the everlasting pursue of ultra-fast information transmission and processing as well as ultra-intense energy concentration and ex…
View article: Integrated circuits based on broadband pixel-array metasurfaces for generating data-carrying optical and THz orbital angular momentum beams
Integrated circuits based on broadband pixel-array metasurfaces for generating data-carrying optical and THz orbital angular momentum beams Open
There is growing interest in using multiple multiplexed orthogonal orbital angular momentum (OAM) beams to increase the data capacity of communication systems in different frequency ranges. To help enable future deployment of OAM-based com…
View article: Integrated sensing and communication in an optical fibre
Integrated sensing and communication in an optical fibre Open
The integration of high-speed optical communication and distributed sensing could bring intelligent functionalities to ubiquitous optical fibre networks, such as urban structure imaging, ocean seismic detection, and safety monitoring of un…
View article: High-capacity free-space optical communications using wavelength- and mode-division-multiplexing in the mid-infrared region
High-capacity free-space optical communications using wavelength- and mode-division-multiplexing in the mid-infrared region Open
Due to its absorption properties in atmosphere, the mid-infrared (mid-IR) region has gained interest for its potential to provide high data capacity in free-space optical (FSO) communications. Here, we experimentally demonstrate wavelength…
View article: Generation of OAM-carrying space-time wave packets with time-dependent beam radii using a coherent combination of multiple LG modes on multiple frequencies
Generation of OAM-carrying space-time wave packets with time-dependent beam radii using a coherent combination of multiple LG modes on multiple frequencies Open
Space-time (ST) wave packets, in which spatial and temporal characteristics are coupled, have gained attention due to their unique propagation characteristics, such as propagation invariance and tunable group velocity in addition to their …
View article: Roadmap on spatiotemporal light fields
Roadmap on spatiotemporal light fields Open
Spatiotemporal sculpturing of light pulse with ultimately sophisticated structures represents the holy grail of the human everlasting pursue of ultrafast information transmission and processing as well as ultra-intense energy concentration…
View article: High capacity terahertz communication systems based on multiple orbital-angular-momentum beams
High capacity terahertz communication systems based on multiple orbital-angular-momentum beams Open
Structured electromagnetic waves carrying orbital angular momentum (OAM) have been explored in various frequency regimes to enhance the data capacity of communication systems by multiplexing multiple co-propagating orthogonal OAM beams (i.…
View article: Tunability of space-time wave packet carrying tunable and dynamically changing OAM value
Tunability of space-time wave packet carrying tunable and dynamically changing OAM value Open
Space-time (ST) wave packets have gained much interest due to their dynamic optical properties. Such wave packets can be generated by synthesizing frequency comb lines, each having multiple complex-weighted spatial modes, to carry dynamica…
View article: Experimental demonstration of dynamic spatiotemporal structured beams that simultaneously exhibit two orbital angular momenta by combining multiple frequency lines, each carrying multiple Laguerre–Gaussian modes
Experimental demonstration of dynamic spatiotemporal structured beams that simultaneously exhibit two orbital angular momenta by combining multiple frequency lines, each carrying multiple Laguerre–Gaussian modes Open
In general, there are different, relatively independent forms of orbital angular momenta at a given propagation distance, which might exhibit different dynamic spatial characteristics. One type involves a beam with a helical phasefront tha…
View article: Metasurface on integrated photonic platform: from mode converters to machine learning
Metasurface on integrated photonic platform: from mode converters to machine learning Open
Integrated photonic circuits are created as a stable and small form factor analogue of fiber-based optical systems, from wavelength-division multiplication transceivers to more recent mode-division multiplexing components. Silicon nanowire…
View article: Synthesis of near-diffraction-free orbital-angular-momentum space-time wave packets having a controllable group velocity using a frequency comb
Synthesis of near-diffraction-free orbital-angular-momentum space-time wave packets having a controllable group velocity using a frequency comb Open
Novel forms of light beams carrying orbital angular momentum (OAM) have recently gained interest, especially due to some of their intriguing propagation features. Here, we experimentally demonstrate the generation of near-diffraction-free …
View article: Directionally Resolved Measurement and Modeling of THz Band Propagation Channels
Directionally Resolved Measurement and Modeling of THz Band Propagation Channels Open
Design and assessment of THz communications systems, which will form an essential part of 6G, require an understanding of the propagation channels the systems will operate in. This paper presents investigations of the channel characteristi…
View article: Orbital angular momentum of light for communications
Orbital angular momentum of light for communications Open
Structured light, especially beams carrying orbital angular momentum (OAM), has gained much interest due to its unique amplitude and phase structures. In terms of communication systems, multiple orthogonal OAM beams can be potentially util…
View article: Turbulence-resilient pilot-assisted self-coherent free-space optical communications using automatic optoelectronic mixing of many modes
Turbulence-resilient pilot-assisted self-coherent free-space optical communications using automatic optoelectronic mixing of many modes Open
In free-space optical communications that use both amplitude and phase data modulation (for example, in quadrature amplitude modulation (QAM)), the data are typically recovered by mixing a Gaussian local oscillator with a received Gaussian…