Publications (52)
uSee: Unified Speech Enhancement and Editing with Conditional Diffusion Models
Muqiao Yang, Chunlei Zhang, Yong Xu +4
Speech enhancement aims to improve the quality of speech signals in terms of quality and intelligibility, and speech editing refers to the process of editing the speech according t…
Quantum diffusion of microcavity solitons
Chengying Bao, Myoung-Gyun Suh, Boqiang Shen +9
Coherently-pumped (Kerr) solitons in an ideal optical microcavity are expected to undergo random quantum motion that determines fundamental performance limits in applications of so…
Vernier spectrometer using counter-propagating soliton microcombs
Qi-Fan Yang, Boqiang Shen, Heming Wang +8
Acquisition of laser frequency with high resolution under continuous and abrupt tuning conditions is important for sensing, spectroscopy and communications. Here, a single microres…
CbLDM: A Diffusion Model for recovering nanostructure from atomic pair distribution function
Jiarui Cao, Zhiyang Zhang, Heming Wang +4
The nanostructure inverse problem is an attractive problem that helps researchers to understand the relationship between the properties and the structure of nanomaterials. This stu…
On the density and multiplicity of solutions to the fractional Nirenberg problem
Zhongwei Tang, Heming Wang, Ning Zhou
This paper is devoted to establishing some results on the density and multiplicity of solutions to the fractional Nirenberg problem which is equivalent to studying the conformally…
Integrated Pockels Laser
Mingxiao Li, Lin Chang, Lue Wu +14
The development of integrated semiconductor lasers has miniaturized traditional bulky laser systems, enabling a wide range of photonic applications. A progression from pure III-V b…
Leveraging Laryngograph Data for Robust Voicing Detection in Speech
Yixuan Zhang, Heming Wang, DeLiang Wang
Accurately detecting voiced intervals in speech signals is a critical step in pitch tracking and has numerous applications. While conventional signal processing methods and deep le…
Three-dimensional integration enables ultra-low-noise, isolator-free Si photonics
Chao Xiang, Warren Jin, Osama Terra +12
While photonic integrated circuits (PICs) are being widely used in applications such as telecommunications and datacenter interconnects, PICs capable of replacing bulk optics and f…
Self-regulating soliton domain walls in microresonators
Heming Wang, Boqiang Shen, Yan Yu +9
Dissipative soliton Kerr frequency combs in microresonators have recently been demonstrated with the self-injection locking process. They have the advantage of turnkey deterministi…
Topology of the generalized Brillouin zone of one-dimensional models
Heming Wang, Janet Zhong, Shanhui Fan
The generalized Brillouin zones (GBZs) are integral in the analysis of non-Hermitian band structures. Conventional wisdom suggests that the GBZ should be connected, where each poin…
Prescribed -curvature flow on the four-dimensional unit ball
Pak Tung Ho, Cheikh Birahim Ndiaye, Liming Sun +1
In this paper, we study the prescribed -curvature problem on the unit ball of via the -curvature flow approach. By combining Ache-Chang's inequ…
Unifying Robustness and Fidelity: A Comprehensive Study of Pretrained Generative Methods for Speech Enhancement in Adverse Conditions
Heming Wang, Meng Yu, Hao Zhang +5
Enhancing speech signal quality in adverse acoustic environments is a persistent challenge in speech processing. Existing deep learning based enhancement methods often struggle to…
Lorentz-Drude dipoles in the radiative limit and their modeling in finite-difference time-domain methods
Heming Wang, Shanhui Fan
The Lorentz-Drude model for electric dipoles is a classical framework widely used in the study of dipole dynamics and light-matter interactions. Here we focus on the behaviors of L…
Integrated magneto-optic based magnetometer: classical and quantum limits
Paolo Pintus, Heming Wang, Sudharsanan Srinivasan +6
Magnetic field sensors with high sensitivity and spatial resolution have profoundly impacted diverse applications ranging from geo-positioning and navigation to medical imaging, ma…
Brillouin Backaction Thermometry for Modal Temperature Control
Yu-Hung Lai, Zhiquan Yuan, Myoung-Gyun Suh +3
Stimulated Brillouin scattering provides optical gain for efficient and narrow-linewidth lasers in high-Q microresonator systems. However, the thermal dependence of the Brillouin p…
DDTSE: Discriminative Diffusion Model for Target Speech Extraction
Leying Zhang, Yao Qian, Linfeng Yu +5
Diffusion models have gained attention in speech enhancement tasks, providing an alternative to conventional discriminative methods. However, research on target speech extraction u…
Experimentally Realizing Convolution Processing in the Photonic Synthetic Frequency Dimension
Lingling Fan, Kai Wang, Heming Wang +2
Convolution is an essential operation in signal and image processing and consumes most of the computing power in convolutional neural networks. Photonic convolution has the promise…
Single-shot ToF sensing with sub-mm precision using conventional CMOS sensors
Manuel Ballester, Heming Wang, Jiren Li +2
We present a novel single-shot interferometric ToF camera targeted for precise 3D measurements of dynamic objects. The camera concept is based on Synthetic Wavelength Interferometr…
Integrated turnkey soliton microcombs operated at CMOS frequencies
Boqiang Shen, Lin Chang, Junqiu Liu +14
While soliton microcombs offer the potential for integration of powerful frequency metrology and precision spectroscopy systems, their operation requires complex startup and feedba…
Combined Generative and Predictive Modeling for Speech Super-resolution
Heming Wang, Eric W. Healy, DeLiang Wang
Speech super-resolution (SR) is the task that restores high-resolution speech from low-resolution input. Existing models employ simulated data and constrained experimental settings…
Petermann-factor limited sensing near an exceptional point
Heming Wang, Yu-Hung Lai, Zhiquan Yuan +2
Non-Hermitian Hamiltonians describing open systems can feature singularities called exceptional points (EPs). Resonant frequencies become strongly dependent on externally applied p…
Wav2vec-Switch: Contrastive Learning from Original-noisy Speech Pairs for Robust Speech Recognition
Yiming Wang, Jinyu Li, Heming Wang +3
The goal of self-supervised learning (SSL) for automatic speech recognition (ASR) is to learn good speech representations from a large amount of unlabeled speech for the downstream…
Topological nature of edge states for one-dimensional systems without symmetry protection
Janet Zhong, Heming Wang, Alexander N Poddubny +1
We numerically verify and analytically prove a winding number invariant that correctly predicts the number of edge states in one-dimensional, nearest-neighbor (between unit cells),…
Braiding of dynamical eigenvalues of Hermitian bosonic Kitaev chains
Heming Wang, Shanhui Fan
In quantum mechanics, observables correspond to Hermitian operators, and the spectra are restricted to be real. However, the dynamics of the underlying fields may allow complex eig…
Pockels Laser Directly Driving Ultrafast Optical Metrology
Shixin Xue, Mingxiao Li, Raymond Lopez-rios +10
The invention of the laser unleashed the potential of optical metrology, leading to numerous advancements in modern science and technology. This reliance on lasers, however, also s…
Engineered zero-dispersion microcombs using CMOS-ready photonics
Qing-Xin Ji, Warren Jin, Lue Wu +14
Normal group velocity dispersion (GVD) microcombs offer high comb line power and high pumping efficiency compared to bright pulse microcombs. The recent demonstration of normal GVD…
Probing material absorption and optical nonlinearity of integrated photonic materials
Maodong Gao, Qi-Fan Yang, Qing-Xin Ji +12
Optical microresonators with high quality () factors are essential to a wide range of integrated photonic devices. Steady efforts have been directed towards increasing microreso…
A self-starting bi-chromatic LiNbO3 soliton microcomb
Yang HE, Qi-Fan Yang, Jingwei Ling +7
For its many useful properties, including second and third-order optical nonlinearity as well as electro-optic control, lithium niobate is considered an important potential microco…
Hertz-linewidth semiconductor lasers using CMOS-ready ultra-high- microresonators
Warren Jin, Qi-Fan Yang, Lin Chang +8
Driven by narrow-linewidth bench-top lasers, coherent optical systems spanning optical communications, metrology and sensing provide unrivalled performance. To transfer these capab…
Chip-scale high-performance photonic microwave oscillator
Yang He, Long Cheng, Heming Wang +5
Optical frequency division based on bulk or fiber optics provides unprecedented spectral purity for microwave oscillators. To extend the applications of this approach, the big chal…
Preserving Speech-to-Text LLM Capabilities in Speech-to-Speech Generation
Yuxuan Hu, Heng Lu, Ruchao Fan +8
Strong speech-to-text (S2T) LLMs already provide robust speech perception and text reasoning, but adding speech-to-speech (S2S) output is challenging: fine-tuning the backbone can…
Unified results of compactness and existence for prescribing fractional -curvatures problem
Yan Li, Zhongwei Tang, Heming Wang +1
In this paper we study the problem of prescribing fractional -curvature of order for a conformal metric on the standard sphere $\Sn$ with and . Com…
Non-Abelian lattice gauge fields in the photonic synthetic frequency dimension
Dali Cheng, Kai Wang, Charles Roques-Carmes +4
Non-Abelian gauge fields provide a conceptual framework for the description of particles having spins. The theoretical importance of non-Abelian gauge fields motivates their experi…
Soliton pulse pairs at multiple colors in normal dispersion microresonators
Zhiquan Yuan, Maodong Gao, Yan Yu +7
Soliton microcombs are helping to advance the miniaturization of a range of comb systems. These combs mode lock through the formation of short temporal pulses in anomalous dispersi…
Self-injection-locked second-harmonic integrated source
Jingwei Ling, Jeremy Staffa, Heming Wang +12
High coherence visible and near-visible laser sources are centrally important to the operation of advanced position/navigation/timing systems as well as classical/quantum sensing s…
One-dimensional non-Hermitian band structures as Riemann surfaces
Heming Wang, Lingling Fan, Shanhui Fan
We present the viewpoint of treating one-dimensional band structures as Riemann surfaces, linking the unique properties of non-Hermiticity to the geometry and topology of the Riema…
Broadband quantum-dot frequency-modulated comb laser
Bozhang Dong, Mario Dumont, Osama Terra +3
Frequency-modulated (FM) laser combs, which offer a periodic quasi-continuous-wave output and a flat-topped optical spectrum, are emerging as a promising solution for wavelength-di…
High-performance lasers for fully integrated silicon nitride photonics
Chao Xiang, Joel Guo, Warren Jin +12
Silicon nitride (SiN) waveguides with ultra-low optical loss enable integrated photonic applications including low noise, narrow linewidth lasers, chip-scale nonlinear photonics, a…
A degree-counting formula for a Keller-Segel equation on a surface with boundary
Mohameden Ahmedou, Zhengni Hu, Heming Wang
In this paper, we consider the following Keller-Segel equation on a compact Riemann surface with smooth boundary : \[ -Î_g u = Ï\Big(\frac{V e^u}{\int_Σ V…
Creating high-dimensional topological physics using a single ring resonator
Dali Cheng, Heming Wang, Charles Roques-Carmes +2
In spaces of three or more dimensions, there exists topological physics of significant richness that has no lower-dimensional counterparts. To experimentally explore high-dimension…
Correlated self-heterodyne method for ultra-low-noise laser linewidth measurements
Zhiquan Yuan, Heming Wang, Peng Liu +9
Narrow-linewidth lasers are important to many applications spanning precision metrology to sensing systems. Characterization of these lasers requires precise measurements of their…
New type of bubbling solutions to a critical fractional Schrödinger equation with double potentials
Ting Li, Zhongwei Tang, Heming Wang +1
In this paper, we study the following critical fractional Schrödinger equation: \begin{equation} (-Î)^s u+V(|y'|,y'')u=K(|y'|,y'')u^{\frac{n+2s}{n-2s}},\quad u>0,\quad y =(y',y''…
Towards visible soliton microcomb generation
Seung Hoon Lee, Dong Yoon Oh, Qi-Fan Yang +7
Frequency combs have applications that extend from the ultra-violet into the mid-infrared bands. Microcombs, a miniature and often semiconductor-chip-based device, can potentially…
Experimental observation of energy-band Riemann surface
Dali Cheng, Heming Wang, Janet Zhong +3
Non-Hermiticity naturally arises in many physical systems that exchange energy with their environment. The presence of non-Hermiticity leads to many novel topological physics pheno…
SpatialCodec: Neural Spatial Speech Coding
Zhongweiyang Xu, Yong Xu, Vinay Kothapally +3
In this work, we address the challenge of encoding speech captured by a microphone array using deep learning techniques with the aim of preserving and accurately reconstructing cru…
Turnkey locking of quantum-dot lasers directly grown on Si
Bozhang Dong, Yating Wan, Weng W. Chow +5
Ultra-low-noise laser sources are crucial for a variety of applications, including microwave synthesizers, optical gyroscopes, and the manipulation of quantum systems. Silicon phot…
Improving Noise Robustness of Contrastive Speech Representation Learning with Speech Reconstruction
Heming Wang, Yao Qian, Xiaofei Wang +6
Noise robustness is essential for deploying automatic speech recognition (ASR) systems in real-world environments. One way to reduce the effect of noise interference is to employ a…
Pole and zero edge state invariant for 1D non-Hermitian sublattice symmetry
Janet Zhong, Heming Wang, Shanhui Fan
There have been several criteria for the existence of topological edge states in 1D non-Hermitian two-band sublattice-symmetric tight-binding Hamiltonians. The generalized Brilloui…
Extending the spectrum of fully integrated photonics
Minh Tran, Chong Zhang, Theodore Morin +15
Integrated photonics has profoundly impacted a wide range of technologies underpinning modern society. The ability to fabricate a complete optical system on a chip offers unrivalle…
Forced Oscillatory Motion of Trapped Counter-Propagating Solitons
Chengying Bao, Boqiang Shen, Myoung-Gyun Suh +6
Both the group velocity and phase velocity of two solitons can be synchronized by a Kerr-effect mediated interaction, causing what is known as soliton trapping. Trapping can occur…
On the CR Nirenberg problem: density and multiplicity of solutions
Zhongwei Tang, Heming Wang, Bingwei Zhang
We prove some results on the density and multiplicity of positive solutions to the prescribed Webster scalar curvature problem on the -dimensional standard unit CR sphere $…
A Novel Foward-PDE Approach as an Alternative to Empirical Mode Decomposition
Heming Wang, Richard Mann, Edward R. Vrscay
In this paper we present a mathematical model of the Empirical Mode Decomposition (EMD). Although EMD is a powerful tool for signal processing, the algorithm itself lacks an approp…