Changxi Yang
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Multilingual Routing in Mixture-of-Experts Open
Mixture-of-Experts (MoE) architectures have become the key to scaling modern LLMs, yet little is understood about how their sparse routing dynamics respond to multilingual data. In this work, we analyze expert routing patterns using parall…
Nanometric dual-comb ranging using photon-level microcavity solitons Open
Laser-based absolute distance measurement with low return power, fast measurement speed, high precision, and immunity to intensity fluctuations is highly demanded in applications spanning from nanotechnology to satellite formation. However…
Rhythmic Soliton Interactions for Integrated Dual-Microcomb Spectroscopy Open
Soliton waves are sustained by a self-created index potential well, and their interactions occur when the potential well is invaded by other solitons. The interactions are important to soliton compounds in plasma, Bose-Einstein condensatio…
Self-injection locking dynamics with Raman actions in AlN microresonators Open
Self-injection locking (SIL) of semiconductor lasers to on-chip microcavities enables significant laser noise purification and diverse nonlinear optical actions. Realizing nonlinear SIL in new material platforms is essential for advancing …
A microcomb-empowered Fourier domain mode-locked LIDAR Open
Light detection and ranging (LIDAR) has emerged as an indispensable tool in autonomous technology. Among its various techniques, frequency-modulated continuous wave (FMCW) LIDAR stands out due to its capability to operate with ultralow ret…
Coherence memory and amnesia in a mode-locked Mamyshev oscillator Open
Self-organization of temporal modes in mode-locked lasers usually starts from quantum noise. In this process, incoherent spontaneous emission is steered into coherent ultrashort pulses by dissipation and nonlinearity. In this work, we inve…
Nanometric dual-comb ranging using photon-level microcavity solitons Open
Absolute distance measurement with low return power, fast measurement speed, high precision, and immunity to intensity fluctuations is highly demanded in nanotechnology. However, achieving all these objectives simultaneously remains a sign…
A microcomb-empowered Fourier domain mode-locked LiDAR Open
Light detection and ranging (LiDAR) has emerged as an indispensable tool in autonomous technology. Among its various techniques, frequency modulated continuous wave (FMCW) LiDAR stands out due to its capability to operate with ultralow ret…
Observation of spatiotemporal stabilizer in a multi-mode fibre laser Open
Spatiotemporal mode-locking (STML) has become an emerging approach to realize organized wavepackets in high-dimensional nonlinear photonic systems. Mode-locking in one dimensional systems employs a saturable absorber to resist fluctuations…
A novel hybrid model for bridge dynamic early warning using LSTM-EM-GMM Open
Early warning of existing bridges is now predominated by deterministic methods. However, these methods face challenges in expressing uncertain factors (such as wind load, temperature load, and other variables, etc.). These problems directl…
View article: Integrated microcavity electric field sensors using Pound-Drever-Hall detection
Integrated microcavity electric field sensors using Pound-Drever-Hall detection Open
Discerning weak electric fields has important implications for cosmology, quantum technology, and identifying power system failures. Photonic integration of electric field sensors is highly desired for practical considerations and offers o…
Rhythmic soliton interactions for integrated dual-microcomb spectroscopy Open
Rotation symmetry of microresonators supports the generation of phase-locked counter-propagating (CP) solitons that can potentially miniaturize dual-comb systems. Realization of these dual-comb compatible solitons in photonic integrated ci…
Coherence memory and amnesia in a mode-locked laser Open
Self-organization of temporal modes in mode-locked lasers usually starts from quantum noise. In this process, incoherent spontaneous emission is steered into coherent ultrashort pulses by dissipation and nonlinearity. In this work, we inve…
Spatiotemporal mode-locking and dissipative solitons in multimode fiber lasers Open
Multimode fiber (MMF) lasers are emerging as a remarkable testbed to study nonlinear spatiotemporal physics with potential applications spanning from high energy pulse generation, precision measurement to nonlinear microscopy. The underlyi…
Plug-and-play fiber-optic sensors based on engineered cells for neurochemical monitoring at high specificity in freely moving animals Open
In vivo detection of neurochemicals, including neurotransmitters and neuromodulators, is critical for both understanding brain mechanisms and diagnosing brain diseases. However, few sensors are competent in monitoring neurochemical dynamic…
View article: Intracavity spatiotemporal metasurfaces
Intracavity spatiotemporal metasurfaces Open
Optical metasurfaces are endowed with unparallel flexibility to manipulate the light field with a subwavelength spatial resolution. Coupling metasurfaces to materials with strong optical nonlinearity may allow ultrafast spatiotemporal ligh…
A Rapid Identification Technique of Moving Loads Based on MobileNetV2 and Transfer Learning Open
Rapid and accurate identification of moving load is crucial for bridge operation management and early warning of overload events. However, it is hard to obtain them rapidly via traditional machine learning methods, due to their massive mod…
All-step-index-fiber spatiotemporally mode-locked laser Open
Spatiotemporal mode-locking (STML) in multi-mode fiber (MMF) lasers has extended the concept of temporal dissipative solitons into spatiotemporal dissipative solitons. To date, all reported STML in MMF lasers has used graded-index (GRIN) M…
Soft and plasmonic hydrogel optical probe for glucose monitoring Open
Glucose monitoring sensors with high softness and flexibility are critical for the developments of wearable and implantable healthcare devices that enable diagnosis, prognosis, and management of diabetes. The design and implementation of s…
Pulsating dissipative solitons in a Mamyshev oscillator Open
Mode-locked fiber lasers provide a versatile playground to study dissipative soliton (DS) dynamics. The corresponding studies not only give insights into soliton dynamics in dissipative systems, but also contribute to femtosecond fiber las…
A New Optical Fiber Probe-Based Quantum Dots Immunofluorescence Biosensors in the Detection of Staphylococcus aureus Open
Staphylococcus aureus ( S. aureus ) is one of the most common clinical pathogenic bacteria with strong pathogenicity and usually leads to various suppurative infections with high fatality. Traditional bacterial culture for the detection of…
Spatiotemporal Mode-Locking in Lasers with Large Modal Dispersion Open
Dissipative nonlinear wave dynamics have been investigated extensively in mode-locked lasers with single transverse mode, whereas there are few studies related to three-dimensional nonlinear dynamics within lasers. Recently, spatiotemporal…
Pure quartic solitons in dispersion-engineered aluminum nitride micro-cavities Open
Pure quartic soliton (PQS) is a new class of solitons demonstrated in recent years and provides innovations in nonlinear optics and its applications. Generating PQSs in micro-cavities offers a novel way to achieve coherent microcombs, pres…
Period-doubling bifurcation in spatiotemporal mode-locked lasers Open
Period-doubling bifurcation is a universal dynamic of nonlinear systems, which has been extensively investigated in laser systems with a single transverse mode. This study presents an experimental observation and theoretical investigation …
Generation of stable and breathing flat-top solitons via Raman assisted four wave mixing in microresonators Open
Flat-top-soliton (or platicon) dynamics in coherently pumped normal dispersion microresonators is important for both fundamental nonlinear physics and microcomb generation in the visible band. Here we numerically investigate the platicon g…
Pattern formation in 2-μm Tm Mamyshev oscillators associated with the dissipative Faraday instability Open
International audience
Soft and Stretchable Polymeric Optical Waveguide-Based Sensors for Wearable and Biomedical Applications Open
The past decades have witnessed the rapid development in soft, stretchable, and biocompatible devices for applications in biomedical monitoring, personal healthcare, and human–machine interfaces. In particular, the design of soft devices i…
Multiple-soliton in spatiotemporal mode-locked multimode fiber lasers Open
Experimental observations of spatiotemporal mode-locked multiple-soliton, including harmonic mode locking and multiple pulses, in multimode fiber (MMF) lasers are reported. Numerical simulations are conducted to investigate the nonlinear d…
Multimodal Coherent Anti-Stokes Raman Scattering Microscopy With a Supercontinuum All-Fiber Laser Open
We demonstrate a compact supercontinuum (SC) all-fiber laser source for multimodal coherent anti-Stokes Raman scattering (CARS) microscopy based on an Er-fiber seed. It can be used in both high-speed narrowband CARS microscopy and broadban…