Zheyuan Zhu
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View article: Extended Kalman filter demonstrated with a reconfigurable analog photonic neural network
Extended Kalman filter demonstrated with a reconfigurable analog photonic neural network Open
We demonstrate a reconfigurable fixed-point photonic neural network (PNN) based on a coherent photonic processor that interfaces with a digital architecture to perform motion tracking on a damped oscillator using the extended Kalman filter…
View article: A Statistical Reconstruction Algorithm for Positronium Lifetime Imaging Using Time-of-Flight Positron Emission Tomography
A Statistical Reconstruction Algorithm for Positronium Lifetime Imaging Using Time-of-Flight Positron Emission Tomography Open
Positron emission tomography (PET) is an important modality for diagnosing diseases such as cancer and Alzheimer's disease, capable of revealing the uptake of radiolabeled molecules that target specific pathological markers of the diseases…
View article: Mode-multiplexed photonic integrated vector dot-product core from inverse design
Mode-multiplexed photonic integrated vector dot-product core from inverse design Open
Photonic computing has the potential to harness the full degrees of freedom (DOFs) of the light field, including the wavelength, spatial mode, spatial location, phase quadrature, and polarization, to achieve a higher level of computing par…
View article: Photonic floating point multiplication using cascaded SSB-SC modulation
Photonic floating point multiplication using cascaded SSB-SC modulation Open
In this paper, we present what we believe to be a novel approach to floating-point multiplication, demonstrated experimentally for the first time. This method involves encoding floating-point numbers onto RF sub-carriers, utilizing amplitu…
View article: Experimental Demonstration and Characterization of a Non-Mode Selective (De)Multiplexer Using Multi-Plane Light Converter (MPLC)
Experimental Demonstration and Characterization of a Non-Mode Selective (De)Multiplexer Using Multi-Plane Light Converter (MPLC) Open
We experimentally demonstrate the use of a multi-plane light converter (MPLC) as a non-mode selective (de)multiplexer for converting Hermite-Gaussian (HG) modes into a Hadamard matrix of fundamental Gaussian spots and vice versa. We interf…
View article: A mode-multiplexed photonic integrated vector dot-product core from inverse design
A mode-multiplexed photonic integrated vector dot-product core from inverse design Open
Photonic computing has the potential of harnessing the full degrees of freedom (DOFs) of the light field, including wavelength, spatial mode, spatial location, phase quadrature, and polarization, to achieve higher level of computation para…
View article: Accelerated fixed-point iterative reconstruction for fiber borescope imaging
Accelerated fixed-point iterative reconstruction for fiber borescope imaging Open
Computational imaging systems with embedded processing have potential advantages in power consumption, computing speed, and cost. However, common processors in embedded vision systems have limited computing capacity and low level of parall…
View article: Fiber optic computing using distributed feedback
Fiber optic computing using distributed feedback Open
The widespread adoption of machine learning and other matrix intensive computing algorithms has inspired renewed interest in analog optical computing, which has the potential to perform large-scale matrix multiplications with superior ener…
View article: Accelerated fixed-point iterative reconstruction for fiber borescope imaging
Accelerated fixed-point iterative reconstruction for fiber borescope imaging Open
Computational imaging systems with embedded processing have potential advantages in power consumption, computing speed, and cost. However, common processors for embedding systems have limited computing capacity with low level of parallelis…
View article: Integrated Photonic Encoder for Terapixel Image Processing
Integrated Photonic Encoder for Terapixel Image Processing Open
Modern lens designs are capable of resolving >10 gigapixels, while advances in camera frame-rate and hyperspectral imaging have made Terapixel/s data acquisition a real possibility. The main bottlenecks preventing such high data-rate syste…
View article: Accelerated fixed-point iterative reconstruction for fiber borescope imaging
Accelerated fixed-point iterative reconstruction for fiber borescope imaging Open
Computational imaging systems with embedded processing have potential advantages in power consumption, computing speed, and cost. However, common processors for embedding systems have limited computing capacity with low level of parallelis…
View article: A physical neural network training approach toward multi-plane light conversion design
A physical neural network training approach toward multi-plane light conversion design Open
Multi-plane light converter (MPLC) designs supporting hundreds of modes are attractive in high-throughput optical communications. These photonic structures typically comprise >10 phase masks in free space, with millions of independent desi…
View article: Low-crosstalk mode-group demultiplexers based on Fabry-Perot thin-film filters
Low-crosstalk mode-group demultiplexers based on Fabry-Perot thin-film filters Open
Mode-group multiplexing (MGM) can increase the capacity of short-reach few-mode optical fiber communication links while avoiding complex digital signal processing. In this paper, we present the design and experimental demonstration of a no…
View article: Post Deadline Paper (PDP) Program
Post Deadline Paper (PDP) Program Open
We report distributed-fiber-optic-sensing results on impulsive acoustic events localization/classification over telecom networks.A deep-learning-based model was trained to classify starter-gun and fireworks signatures with high accuracy of…
View article: A statistical reconstruction algorithm for positronium lifetime imaging using time-of-flight positron emission tomography
A statistical reconstruction algorithm for positronium lifetime imaging using time-of-flight positron emission tomography Open
Positron emission tomography (PET) is an important modality for diagnosing diseases such as cancer and Alzheimer's disease, capable of revealing the uptake of radiolabeled molecules that target specific pathological markers of the diseases…
View article: Fixed-point iterative linear inverse solver with extended precision
Fixed-point iterative linear inverse solver with extended precision Open
Solving linear systems is a ubiquitous task in science and engineering. Because directly inverting a large-scale linear system can be computationally expensive, iterative algorithms are often used to numerically find the inverse. To accomm…
View article: Training of Mixed-Signal Optical Convolutional Neural Networks With Reduced Quantization Levels
Training of Mixed-Signal Optical Convolutional Neural Networks With Reduced Quantization Levels Open
Analog computing paradigms are promising solutions to the growing computational demands of machine learning applications. Despite being susceptible to errors, analog and mixed-signal platforms have the potential to achieve higher speed and…
View article: Signal Retrieval With Measurement System Knowledge Using Variational Generative Model
Signal Retrieval With Measurement System Knowledge Using Variational Generative Model Open
Signal retrieval from a series of indirect measurements is a common task in many imaging, metrology, and characterization platforms in science and engineering. Because most of the indirect measurement processes are well-described by physic…
View article: Computational Imaging with Limited Photon Budget
Computational Imaging with Limited Photon Budget Open
The capability of retrieving the image/signal of interest from extremely low photon flux is attractive in scientific, industrial, and medical imaging applications. Conventional imaging modalities and reconstruction algorithms rely on hundr…
View article: Coded cone-beam x-ray diffraction tomography with a low-brilliance tabletop source
Coded cone-beam x-ray diffraction tomography with a low-brilliance tabletop source Open
X-ray diffraction tomography (XDT) probes the spatially variant x-ray diffraction (XRD) profile within volumetric objects. Here, we demonstrate a tabletop XDT setup with coded cone-beam illumination that accelerates the acquisition process…
View article: Image Transport Through Meter-Long Randomly Disordered Silica-Air Optical Fiber
Image Transport Through Meter-Long Randomly Disordered Silica-Air Optical Fiber Open
We present a randomly disordered silica-air optical fiber featuring a 28.5% air filling fraction in the structured region, and low attenuation below 1 dB per meter at visible wavelengths. The quality of images transported through this fibe…
View article: Dielectric broadband meta-vector-polarizers based on nematic liquid crystal
Dielectric broadband meta-vector-polarizers based on nematic liquid crystal Open
Polarizer, as an indispensable optical element, has been widely used in various optical systems, which splits a beam into two beams of orthogonal linear polarizations. Due to the appearance of the vector optical field (VOF) and its unique …
View article: Small-angle scatter tomography with a photon-counting detector array
Small-angle scatter tomography with a photon-counting detector array Open
Small-angle x-ray scatter imaging has a high intrinsic contrast in cancer research and other applications, and provides information on molecular composition and micro-structure of the tissue. In general, the implementations of small-angle …