Tootfinder

Fiber Signal Denoising Algorithm using Hybrid Deep Learning Networks
Linlin Wang, Wei Wang, Dezhao Wang, Shanwen Wang
https://arxiv.org/abs/2506.15125 http…

Fiber Signal Denoising Algorithm using Hybrid Deep Learning Networks
With the applicability of optical fiber-based distributed acoustic sensing (DAS) systems, effective signal processing and analysis approaches are needed to promote its popularization in the field of intelligent transportation systems (ITS). This paper presents a signal denoising algorithm using a hybrid deep-learning network (HDLNet). Without annotated data and time-consuming labeling, this self-supervised network runs in parallel, combining an autoencoder for denoising (DAE) and a long short-t…

Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source
Jipeng Wang, Joscha Hanel, Zenghui Jiang, Raphael Joos, Michael Jetter, Eddy Patrick Rugeramigabo, Simone Luca Portalupi, Peter Michler, Xiao-Yu Cao, Hua-Lei Yin, Shan Lei, Jingzhong Yang, Michael Zopf, Fei Ding
https://arxiv.org/abs/2506.155…

Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source
Quantum key distribution (QKD) with deterministic single photon sources has been demonstrated over intercity fiber and free-space channels. The previous implementations relied mainly on polarization encoding schemes, which are susceptible to birefringence, polarization-mode dispersion and polarization-dependent loss in practical fiber networks. In contrast, time-bin encoding offers inherent robustness and has been widely adopted in mature QKD systems using weak coherent laser pulses. However, i…

In other news, today my neighborhood got glass fiber installed across all houses, now we have to wait for Swisscom to send the appropriate modem for it to become useful.
Apparently it's 10x faster than our current internet connection, we'll see.

Procedures for Constraining Robotic Fiber Positioning for Highly Multiplexed Spectroscopic Surveys: The Case of FPS for SDSS-V
Ilija Medan, Tom Dwelly, Kevin R. Covey, Eleonora Zari, Michael R. Blanton, Joleen K. Carlberg, S. Drew Chojnowski, Alexander Ji, Yue Shen, John Donor, Jos\'e S\'anchez-Gallego, Sean Morrison, H\'ector J. Ibarra-Medel, Conor Sayres, Keivan G. Stassun

Procedures for Constraining Robotic Fiber Positioning for Highly Multiplexed Spectroscopic Surveys: The Case of FPS for SDSS-V
One crucial aspect of planning any large scale astronomical survey is constructing an observing strategy that maximizes reduced data quality. This is especially important for surveys that are rather heterogeneous and broad-ranging in their science goals. The Sloan Digital Sky Survey V (SDSS-V), which now utilizes the Focal Plane System (FPS) to robotically place fibers that feed the spectrographs, certainly meets these criteria. The addition of the FPS facilities an increase in survey efficienc…

What Price Fiber Bundle Substantivalism? On How to Avoid Holes in Fibers
Philipp Berghofer, Jordan Fran\c{c}ois, Lucrezia Ravera
https://arxiv.org/abs/2505.12876

What Price Fiber Bundle Substantivalism? On How to Avoid Holes in Fibers
On a mathematically foundational level, our most successful physical theories (gauge field theories and general-relativistic theories) are formulated in a framework based on the differential geometry of connections on principal bundles. After reviewing the essentials of this framework, we articulate the generalized hole and point-coincidence arguments, examining how they weight on a substantivalist position towards bundle spaces. This question, then, is considered in light of the Dressing Field…

Vane rheology of a fiber-reinforced granular material
Ladislas Wierzchalek, Georges Gauthier, Baptiste Darbois-Texier
https://arxiv.org/abs/2506.11762 http…

Vane rheology of a fiber-reinforced granular material
The addition of a small quantity of flexible fibers in a granular material is an efficient technique to increase the yield stress of the material. While the influence of fiber addition on the mechanical strength of granular media has been studied, much less is known about the flow properties of grain-fiber mixtures. In this article, we explore the effect of flexible fibers on the flow behavior of grain-fiber mixtures above the yield stress. We use a vane geometry to study the rheology of a dry …

Droplet on a sugar fiber
St\'ephane Dorbolo, Floriane Weyer, Alexandre Delory, Apurav Tembe, Zhao Pan
https://arxiv.org/abs/2506.09797 https://

Droplet on a sugar fiber
The motion of a water droplet on a single vertical sugar fiber is analyzed. The fiber is positioned vertically, with the droplet placed at its pending end. If the capillary force exceeds the weight of the droplet, the droplet remains suspended at the fiber's extremity. As water dissolves, the fiber eventually breaks. Subsequently, the droplet may fall down carrying a portion of the undissolved fiber or, more interestingly, the droplet may be propelled upwards, remaining attached to the fiber. T…

These dumbasses cut fiber optic cables thinking they were stealing copper.
✅ Spectrum says would-be copper thieves behind widespread outage - Los Angeles Times
https://www.latimes.com/california/story/2025…

Spectrum says would-be copper thieves behind widespread outage
Spectrum believes cable-cutters were looking for copper and -- though they found none -- they severed fiber-optic cables, causing a widespread internet outage.

The Legendrian Hopf Link has exactly two Lagrangian fillings
Bryce Thomson
https://arxiv.org/abs/2506.15111 https://arxiv.org/pdf/250…

The Legendrian Hopf Link has exactly two Lagrangian fillings
We prove that there are precisely two embedded exact Lagrangian fillings of the standard Legendrian Hopf link, up to compactly supported Hamiltonian isotopy. It was known that the standard Legendrian Hopf link admitted at least two such Lagrangian fillings: we show these are all. Specifically, we use a type of neck-stretching procedure to construct a pseudoholomorphic conic fibration that makes a given arbitrary exact Lagrangian filling fiber over a real curve, under a global pseudoholomorphic …

Few-MHz bandwidth tunable optical filter based on a fiber-ring resonator
Gabriele Maron, Anton B\"olian, Xin-Xin Hu, Luke Masters, Arno Rauschenbeutel, J\"urgen Volz
https://arxiv.org/abs/2506.11953

Few-MHz bandwidth tunable optical filter based on a fiber-ring resonator
We present a fiber-ring resonator that realizes an ultra-narrowband, high-extinction, low-loss, tunable optical filter. It consists of a pair of commercial variable ratio directional couplers that allow precise adjustment of the filter bandwidth and its on-resonance transmission. This design also grants access to multiple modes of operation, such as a simultaneous band-stop and band-pass filter. Our characterization reveals a bandwidth of less than 2 MHz, together with an extinction exceeding 2…

Okay, everything is buttoned up again, only almost stripped a rack hole out. However, time to leave things alone and see if it catches fire.
#homelab #minirack

Controlled manipulation of solitons in a recirculating fiber loop using external potentials
Fran\c{c}ois Copie, Pierre Suret, St\'ephane Randoux
https://arxiv.org/abs/2506.13544

Controlled manipulation of solitons in a recirculating fiber loop using external potentials
Optical solitons are self-sustained wave packets that propagate without distortion due to a balance between dispersion and nonlinearity. Their unique stability underpins key photonic applications while also playing a central role in nonlinear wave physics. However, real-time control over soliton dynamics in non-dissipative systems remains a major challenge, limiting their practical applications in photonic systems. Here, we introduce a fiber-based platform for soliton manipulation, by creating …

Measurements of the Diffuse Interstellar Bands at 5780, 5797, and 6614 \r{A} in the Hot Stellar Spectra of the LAMOST LRS DR10
Xiao-Xiao Ma, A-Li Luo, Jian-Jun Chen, Jing Chen, Jun-Chao Liang
https://arxiv.org/abs/2506.14346

Measurements of the Diffuse Interstellar Bands at 5780, 5797, and 6614 Å in the Hot Stellar Spectra of the LAMOST LRS DR10
Diffuse Interstellar Bands (DIBs) are crucial tracers of the interstellar medium (ISM), yet their carriers remain poorly understood. While large-scale surveys have advanced DIB studies in cool stellar spectra, measurements in hot stellar spectra are still limited. Using 287 277 high signal-to-noise (S/N $>$ 50) hot stellar spectra from the tenth data release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope low-resolution spectroscopic survey (LAMOST LRS DR10), we systematically …

A Hierarchical Constructive Heuristic for Large-Scale Survivable Traffic Grooming Problem under Double-Link Failures
Silong Zhang, Jixuan Feng, Junyan Liu, Yu Liu, Zhou Xu, Fan Zhang
https://arxiv.org/abs/2506.13074

A Hierarchical Constructive Heuristic for Large-Scale Survivable Traffic Grooming Problem under Double-Link Failures
This paper studies a survivable traffic grooming problem in large-scale optical transport networks under double-link failures (STG2). Each communication demand must be assigned a route for every possible scenario involving zero, one, or two failed fiber links. Protection against double-link failures is crucial for ensuring reliable telecommunications services while minimizing equipment costs, making it essential for telecommunications companies today. However, this significantly complicates the…

LP Relaxations for Routing and Wavelength Assignment with Partial Path Protection: Formulations and Computations
Xianyan Yang, Junyan Liu, Fan Zhang, Fabo Sun, Feng Li, Zhou Xu
https://arxiv.org/abs/2506.12838

LP Relaxations for Routing and Wavelength Assignment with Partial Path Protection: Formulations and Computations
As a variant of the routing and wavelength assignment problem (RWAP), the RWAP with partial path protection (RWAP-PPP) designs a reliable optical-fiber network for telecommunications. It assigns paths and wavelengths to meet communication requests, not only in normal working situations but also in potential failure cases where an optical link fails. The literature lacks efficient relaxations to produce tight lower bounds on the optimal objective value of the RWAP-PPP. Consequently, the solution…

High-Sensitivity Fiber Interferometer for Gravitational Phase Shift Measurement on Entangled States
Eleonora Polini, Piotr Chru\'sciel, Georgi Dvali, Christopher Hilweg, Beg\"um Kabag\"oz, Dorotea Macri, Thomas Mieling, Thomas Morling, Eric Oelker, Elisabeth Steininger, Xinghui Yin, Haocun Yu, Sebastian Zell, Tongxuan Zhang, Nergis Mavalvala, Philip Walther

High-Sensitivity Fiber Interferometer for Gravitational Phase Shift Measurement on Entangled States
In this contribution, we describe the status of our experiment aimed at measuring the gravitationally induced phase shift on path-entangled photons. We use a kilometer-scale fiber interferometer whose arms are vertically displaced in the Earth gravitational potential, allowing photons propagating at different heights to accumulate different phases. To date, this is the first experiment to measure this effect on massless particles, thereby experimentally combining general relativity and quantum …

Canonical traces of fiber products and their applications
Shinya Kumashiro, Sora Miyashita
https://arxiv.org/abs/2506.04899 https://a…

Canonical traces of fiber products and their applications
We study the canonical trace of the fiber product of Noetherian rings. Furthermore, we extend results on the class of Cohen-Macaulay rings called Teter type to Noetherian rings. As an application of our study on canonical traces and Noetherian rings of Teter type, we compute the canonical trace of the Stanley-Reisner ring arising from a non-connected simplicial complex. In particular, we provide a characterization of Stanley-Reisner rings for which the canonical trace contains the graded maxima…

AT&T to Acquire Lumen’s Mass Markets Fiber Business
https://about.att.com/story/2025/lumen-mass-markets-fiber-business.html

#Worldrecord: 1 million GB per sec #internet speed achieved by #Japan over 1,100 miles

Japan sends 1 million GB of data across 1,100 miles in a second
Current data transfer speeds aren’t enough to support AI, VR, IoT, and various other emerging technologies. Here’s a mindblowing solution.

Resolving Discrepancies in Wood Micromechanics: Strain-Mapped Compression of Tracheid Wall Micropillars
J\'ulio O. Amando de Barros, Jakob Schwiedrzik, Falk K. Wittel
https://arxiv.org/abs/2506.11177

Resolving Discrepancies in Wood Micromechanics: Strain-Mapped Compression of Tracheid Wall Micropillars
Wood's increasing role as a structural resource in sustainable materials selection demands accurate characterization of its mechanical behavior. Its performance arises from a hierarchical structure, where the dominant load-bearing component is the S2 layer of tracheid cell walls-a thick, fiber-reinforced composite of cellulose microfibrils embedded in hemicelluloses and lignin. Due to the small dimensions and anisotropic nature of the S2 layer, mechanical testing presents significant challenges…

Embeddings into the ultrapower of the Jiang-Su algebra
Ben Bouwen, Jennifer Pi
https://arxiv.org/abs/2506.11983 https://arxiv.org/pdf…

Embeddings into the ultrapower of the Jiang-Su algebra
We study existence of embeddings into ultrapowers of the Jiang-Su algebra $\mathcal{Z}$ and the Razak-Jacelon algebra $\mathcal{W}$. More specifically, we show that the cone over any separable $C^*$-algebra embeds into the ultrapowers of both $\mathcal{Z}$ and $\mathcal{W}$. We also show that the result for $\mathcal{Z}$ generalizes to separable and exact continuous fields of $C^*$-algebras for which one of the fibers embeds into the ultrapower of $\mathcal{Z}$, if this fiber is suitably well-b…

AI-Augmented OTDR Fault Localization Framework for Resilient Rural Fiber Networks in the United States
Sabab Al Farabi (Department of Industrial Engineering, Lamar University, Beaumont, Texas, USA)
https://arxiv.org/abs/2506.03041

AI-Augmented OTDR Fault Localization Framework for Resilient Rural Fiber Networks in the United States
This research presents a novel framework that combines traditional Optical Time-Domain Reflectometer (OTDR) signal analysis with machine learning to localize and classify fiber optic faults in rural broadband infrastructures. The proposed system addresses a critical need in the expansion of middle-mile and last-mile networks, particularly in regions targeted by the U.S. Broadband Equity, Access, and Deployment (BEAD) Program. By enhancing fault diagnosis through a predictive, AI-based model, th…

Using Neurogram Similarity Index Measure (NSIM) to Model Hearing Loss and Cochlear Neural Degeneration
Ahsan J. Cheema, Sunil Puria
https://arxiv.org/abs/2506.12705

Using Neurogram Similarity Index Measure (NSIM) to Model Hearing Loss and Cochlear Neural Degeneration
Trouble hearing in noisy situations remains a common complaint for both individuals with hearing loss and individuals with normal hearing. This is hypothesized to arise due to condition called: cochlear neural degeneration (CND) which can also result in significant variabilities in hearing aids outcomes. This paper uses computational models of auditory periphery to simulate various hearing tasks. We present an objective method to quantify hearing loss and CND by comparing auditory nerve fiber r…

Constrained Hamiltonian Systems on Observation-Induced Fiber Bundles: Theory of Symmetry and Integrability
Dongzhe Zheng
https://arxiv.org/abs/2505.22824 h…

Constrained Hamiltonian Systems on Observation-Induced Fiber Bundles: Theory of Symmetry and Integrability
Classical constrained Hamiltonian theory assumes complete observability of system states, but in reality only partial state information is often available. This paper establishes a complete geometric theoretical framework for handling such incompletely observed systems. By introducing the concept of observation-induced fiber bundles, we naturally extend Dirac constraint theory to the fiber bundle setting, unifying the treatment of state constraints and observation constraints. Main results incl…

This https://arxiv.org/abs/2504.03079 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Evaluation of the Response to Electrons and Pions in the Scintillating Fiber and Lead Calorimeter for the Future Electron-Ion Collider
The performance of the Baby Barrel Electromagnetic Calorimeter (Baby BCAL) - a small-scale lead-scintillating-fiber (Pb/ScFi) prototype of the GlueX Barrel Electromagnetic Calorimeter (BCAL) - was tested in a dedicated beam campaign at the Fermilab Test Beam Facility (FTBF). This study provides a benchmark for the Pb/ScFi component of the future Barrel Imaging Calorimeter (BIC) in the ePIC detector at the Electron-Ion Collider (EIC). The detector response to electrons and pions was studied at b…

Effective positivity of Hodge bundles and applications
Giulio Codogni, Zsolt Patakfalvi, Luca Tasin
https://arxiv.org/abs/2506.10515 https://

Effective positivity of Hodge bundles and applications
We show boundedness results that are from different areas of algebraic geometry, but they are closely connected mathematically. The technical starting point is bounding the integer $q>0$ for which the $q$-th Hodge bundles becomes (semi-)positive for families of stable varieties. We then draw many consequences, among which: 1.) a lower bound for the Chow-Mumford volumes of fibrations of fixed dimension and klt general fiber; 2.) a lower bound on the Chow-Moumford volume of moduli spaces of stabl…

Multipathing: it makes fixing cabling issues so much easier. Swapped out the 2x2m fiber patches to the NAS with 2x5m ones because the old ones were just a smidge strained. Had absolutely no issues swapping them out one by one and no downtime.
#homelab #multipath

Machine Learning-Driven Compensation for Non-Ideal Channels in AWG-Based FBG Interrogator
Ivan A. Kazakov, Iana V. Kulichenko, Egor E. Kovalev, Angelina A. Treskova, Daria D. Barma, Kirill M. Malakhov, Arkady V. Shipulin
https://arxiv.org/abs/2506.13575

Machine Learning-Driven Compensation for Non-Ideal Channels in AWG-Based FBG Interrogator
We present an experimental study of a fiber Bragg grating (FBG) interrogator based on a silicon oxynitride (SiON) photonic integrated arrayed waveguide grating (AWG). While AWG-based interrogators are compact and scalable, their practical performance is limited by non-ideal spectral responses. To address this, two calibration strategies within a 2.4 nm spectral region were compared: (1) a segmented analytical model based on a sigmoid fitting function, and (2) a machine learning (ML)-based regre…

Efficient fiber coupling of telecom single-photons from circular Bragg gratings
Nam Tran, Pavel Ruchka, Sara Jakovljevic, Benjamin Breiholz, Peter Gier{\ss}, Ponraj Vijayan, Carlos Eduardo Jimenez, Alois Herkommer, Michael Jetter, Simone Luca Portalupi, Harald Giessen, Peter Michler
https://arxiv.org/abs/2506.01661

Efficient fiber coupling of telecom single-photons from circular Bragg gratings
Deterministic sources of quantum light are becoming increasingly relevant in the development of quantum communication, particularly in deployed fiber networks. Therefore, efficient fiber-coupled sources at telecom wavelength are highly sought after. With this goal in mind, we systematically investigate the fiber coupling performance of quantum dots in optical resonators under three experimental configurations. We quantify coupling efficiency and sensitivity to spatial displacement for single-mo…

Ideal Triangulations and Once-Punctured Surface Bundles
Birch Bryant
https://arxiv.org/abs/2505.21798 https://arxiv.org/pdf/2505.2179…

Ideal Triangulations and Once-Punctured Surface Bundles
A well-known result of Walsh states that if $\mathcal T^*$ is an ideal triangulation of an atoroidal, acylindrical, irreducible, compact 3-manifold with torus boundary components, then every properly embedded, two-sided, incompressible surface $S$ is isotopic to a spun-normal surface unless $S$ is isotopic to a fiber or virtual fiber. Previously it was unknown if for such a 3-manifold an ideal triangulation in which a fiber spun-normalizes exists. We give a proof of existence and give an algori…

If the meat is burned to carbon, does it count as carbohydrates? Or as fiber?

A Soft Robotic Module with Pneumatic Actuation and Enhanced Controllability Using a Shape Memory Alloy Wire
Mohammadnavid Golchin
https://arxiv.org/abs/2506.05741

A Soft Robotic Module with Pneumatic Actuation and Enhanced Controllability Using a Shape Memory Alloy Wire
In this paper, a compressed air-actuated soft robotic module was developed by incorporating a shape memory alloy (SMA) wire into its structure to achieve the desired bending angle with greater precision. First, a fiber-reinforced bending module with a strain-limiting layer made of polypropylene was fabricated. The SMA wire was then placed in a silicon matrix, which was used as a new strain-limiting layer. A simple closed-loop control algorithm was used to regulate the bending angle of the soft …

Squash And Kale Quinoa Salad #plantbased

Squash And Raw Kale Quinoa Salad
For a fiber-rich and protein packed meal, try this squash and kale quinoa salad. It's served with a cashew dressing.

DAS-MAE: A self-supervised pre-training framework for universal and high-performance representation learning of distributed fiber-optic acoustic sensing
Junyi Duan, Jiageng Chen, Zuyuan He
https://arxiv.org/abs/2506.04552

DAS-MAE: A self-supervised pre-training framework for universal and high-performance representation learning of distributed fiber-optic acoustic sensing
Distributed fiber-optic acoustic sensing (DAS) has emerged as a transformative approach for distributed vibration measurement with high spatial resolution and long measurement range while maintaining cost-efficiency. However, the two-dimensional spatial-temporal DAS signals present analytical challenges. The abstract signal morphology lacking intuitive physical correspondence complicates human interpretation, and its unique spatial-temporal coupling renders conventional image processing methods…

Well now, this is interesting.... what do you think this technique is called?

Dynamical thermalization, Rayleigh-Jeans condensate, vortexes and wave collapse in quantum chaos fibers and fluid of light
Leonardo Ermann, Alexei D. Chepelianskii, Dima L. Shepelyansky
https://arxiv.org/abs/2506.06534

Dynamical thermalization, Rayleigh-Jeans condensate, vortexes and wave collapse in quantum chaos fibers and fluid of light
We study analytically and numerically the time evolution of a nonlinear field described by the nonlinear Schrödinger equation in a chaotic $D$-shape billiard. In absence of nonlinearity the system has standard properties of quantum chaos. This model describes a longitudinal light propagation in a multimode D-shape optical fiber and also those in a Kerr nonlinear medium of atomic vapor. We show that, above a certain chaos border of nonlinearity, chaos leads to dynamical thermalization with the …

Did a smidge of cable management because the fiber runs to the QNAP needed a bit more slack. Things I love: being able to disconnect the connections to the iSCSI storage and have absolutely no loss of connectivity.
#homelab

This https://arxiv.org/abs/2503.06434 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Droplets Suspended Beneath a Fiber Hub
Droplet-fiber interactions, prevalent in nature and widely applied across various engineering fields, have garnered significant research interest. Many works have focused on the interactions between droplets and single or two fibers. However, the wetting behavior of droplets, especially the maximum droplets that can be retained, on fiber hubs formed by many fibers is rarely studied. The current work explores the capability of fiber hubs to retain liquid droplets. We develop analytical and semi-…

Power Domain Sparse Dimensional Constellation Multiple Access (PD-SDCMA) for Enabled Flexible PONs
Yuhao Lian, Xiao Han, Xinmao Deng
https://arxiv.org/abs/2506.08053

Power Domain Sparse Dimensional Constellation Multiple Access (PD-SDCMA) for Enabled Flexible PONs
With the commercial deployment of 5G and the in-depth research of 6G, the demand for high-speed data services in the next-generation fiber optic access systems is growing increasingly. Passive optical networks (PONs) have become a research hotspot due to their characteristics of low loss, high bandwidth, and low cost. However, the traditional orthogonal multiple access (OMA-PON) has difficulty meeting the requirements of the next-generation PON for high spectral efficiency and flexibility. In t…

High-Precision Acoustic Event Monitoring in Single-Mode Fibers Using Fisher Information
Catarina S. Monteiro, Tiago D. Ferreira, Nuno A. Silva
https://arxiv.org/abs/2506.10561

High-Precision Acoustic Event Monitoring in Single-Mode Fibers Using Fisher Information
Polarization optical fiber sensors are based on modifications of fiber birefringence by an external measurand (e.g. strain, pressure, acoustic waves). Yet, this means that different input states of polarization will result in very distinct behaviors, which may or may not be optimal in terms of sensitivity and signal-to-noise ratio. To tackle this challenge, this manuscript presents an optimization technique for the input polarization state using the Fisher information formalism, which allows fo…

This https://arxiv.org/abs/2402.19372 has been replaced.
initial toot: https://mastoxiv.page/@arX…

A miniaturized magnetic field sensor based on nitrogen-vacancy centers
The nitrogen-vacancy (NV) center in diamond is a prime candidate for quantum sensing technologies. Here, we present a fully integrated and mechanically robust fiber-based endoscopic sensor with a tip diameter of $1.25 \mathrm{mm}$. On its tip, a direct laser writing process is used to fixate a diamond containing NV centers above the fiber's core inside a polymer structure. Additionally, a metallic direct laser-written antenna structure next to the fiber facet allows efficient microwave manipula…

Deligne 1-motives with torsion and \'etale motives
Rapha\"el Ruimy
https://arxiv.org/abs/2506.10637 https://arxiv.org/pdf/25…

Deligne 1-motives with torsion and étale motives
We construct the motivic t-structure on 1-motives with integral coefficients over a scheme of characteristic zero or a Dedekind scheme. When we invert the residue characteristic exponents of the base, this t-structure induces a t-structure on the category of smooth 1-motives whose heart is the category of Deligne 1-motives with torsion which we prove to be abelian. This relies on the fact that over a normal scheme, Deligne 1-motives with torsion are determined by their fiber on the generic poin…

This https://arxiv.org/abs/2412.08499 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Scattering polarimetry enables correlative nerve fiber imaging and multimodal analysis
Mapping the intricate network of nerve fibers is crucial for understanding brain function. Three-Dimensional Polarized Light Imaging (3D-PLI) and Computational Scattered Light Imaging (ComSLI) map dense nerve fibers in brain sections with micrometer resolution using visible light. 3D-PLI reconstructs 3D-fiber orientations, while ComSLI disentangles multiple directions per pixel. So far, these imaging techniques have been realized in separate setups. A combination within a single device would fa…

From Spikes to Speech: NeuroVoc -- A Biologically Plausible Vocoder Framework for Auditory Perception and Cochlear Implant Simulation
Jacob de Nobel, Jeroen J. Briaire, Thomas H. W. Baeck, Anna V. Kononova, Johan H. M. Frijns
https://arxiv.org/abs/2506.03959

From Spikes to Speech: NeuroVoc -- A Biologically Plausible Vocoder Framework for Auditory Perception and Cochlear Implant Simulation
We present NeuroVoc, a flexible model-agnostic vocoder framework that reconstructs acoustic waveforms from simulated neural activity patterns using an inverse Fourier transform. The system applies straightforward signal processing to neurogram representations, time-frequency binned outputs from auditory nerve fiber models. Crucially, the model architecture is modular, allowing for easy substitution or modification of the underlying auditory models. This flexibility eliminates the need for speec…

The network cabling came in so got it installed. Not sure if this is _exactly_ the way I want to run it, but either way it's pretty clean overall. Each one of the Minisforum MS-A2s will get 2x10GbE fiber for iSCSI and 1x2.5GbE for VM traffic.
#minirack #homelab

Generalized cones admitting a curvature-dimension condition
Matteo Calisti, Christian Ketterer, Clemens S\"amann
https://arxiv.org/abs/2506.02723 http…

Generalized cones admitting a curvature-dimension condition
We study (generalized) cones over metric spaces, both in Riemannian and Lorentzian signature. In particular, we establish synthetic lower Ricci curvature bounds à la Lott-Villani-Sturm and Ohta in the metric measure case, and à la Cavalletti-Mondino in Lorentzian signature. Here, a generalized cone is a warped product of a one-dimensional base space, which will be positive or negative definite, over a fiber that is a metric space. We prove that Riemannian or Lorentzian generalized cones over …

Brillouin-Mandelstam scattering in telecommunications optical fiber at millikelvin temperatures
E. A. Cryer-Jenkins, A. C. Leung, H. Rathee, A. K. C. Tan, K. D. Major, M. R. Vanner
https://arxiv.org/abs/2506.09654

Brillouin-Mandelstam scattering in telecommunications optical fiber at millikelvin temperatures
Brillouin-Mandelstam scattering is a strong and readily accessible optical nonlinearity enabling a wide array of applications and research directions. For instance, the three-wave mixing process has been employed to great success for narrow-linewidth lasers, sensing applications, microscopy, and signal processing. While most of these avenues focus on room temperature operation, there is now increasing interest in cryogenic operation owing to the scattering mechanism's significant potential for …

Predicting air flow in calendered paper sheets from $\mu$-CT data: combining physics with morphology
Phillip Gr\"afensteiner, Andoni Rodriguez, Peter Leitl, Ekaterina Baikova, Maximilian Fuchs, Eduardo Machado Charry, Ulrich Hirn, Andr\'e Hilger, Ingo Manke, Robert Schennach, Matthias Neumann, Volker Schmidt, Karin Zojer
https://

Predicting air flow in calendered paper sheets from $μ$-CT data: combining physics with morphology
Predicting the macroscopic properties of thin fiber-based porous materials from their microscopic morphology remains challenging because of the structural heterogeneity of these materials. In this study, computational fluid dynamics simulations were performed to compute volume air flow based on tomographic image data of uncompressed and compressed paper sheets. To reduce computational demands, a pore network model was employed, allowing volume air flow to be approximated with less computational…

This https://arxiv.org/abs/2408.06616 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Gromov-Witten invariants in family and quantum cohomology
A moduli space of stable maps to the fibers of a fiber bundle is constructed. The new moduli space is a family version of the classical moduli space of stable maps to a non-singular complex projective variety. The virtual cycle for this moduli space is also constructed, and an analogue of Gromov-Witten invariants is defined. As an application, we recover the formula for the number of rational degree d curves in P3, whose image lies in a plane in P3 (known as planar curves in P3), intersecting r…

Load-Dependent Power-Law Exponent in Creep Rupture of Heterogeneous Materials
Chlo\'e Braux, Antoine B\'erut, Lo\"ic Vanel
https://arxiv.org/abs/2506.06145

Load-Dependent Power-Law Exponent in Creep Rupture of Heterogeneous Materials
Creep tests on heterogeneous materials under subcritical loading typically show a power-law decaying strain rate before failure, with the exponent often considered material-dependent but independent of applied stress. By imposing successive small stress relaxations through a displacement feedback loop, we probe creep dynamics and show experimentally that this exponent varies with both applied load and loading direction. Simulations of a disordered fiber bundle model reproduce this load dependen…

Record-Breaking 1935.6 bit/s/Hz Spectral Efficiency in 19-Ring-Core Fiber Transmission of GMI-Estimated 25.24 Pb/s Capacity Using Low-Complexity 4x4 MIMO
Hualin Li, Junyi Liu, Jie Liu, Shuqi Mo, Haolin Zhou, Yuming Huang, Yining Huang, Lei Shen, Shuo Xu, Lei Zhang, Jie Luo, Zhaohui Li, Siyuan Yu
https://arxiv.org/abs/2506.04910

Record-Breaking 1935.6 bit/s/Hz Spectral Efficiency in 19-Ring-Core Fiber Transmission of GMI-Estimated 25.24 Pb/s Capacity Using Low-Complexity 4x4 MIMO
We achieve a record spectral efficiency of 1935.6 bit/s/Hz in the C+L bands in a 10-km 19-ring-core fiber supporting 266 OAM modes. GMI-estimated capacity of 25.24 Pb/s are transmitted using low-complexity 4x4 MIMO.

Vanishing arcs for isolated plane curve singularities
Hanwool Bae, Cheol-Hyun Cho, Dongwook Choa, Wonbo Jeong, Pablo Portilla Cuadrado
https://arxiv.org/abs/2506.04917

Vanishing arcs for isolated plane curve singularities
The variation operator associated with an isolated hypersurface singularity is a classical topological invariant that relates relative and absolute homologies of the Milnor fiber via a non trivial isomorphism. Here we work with a topological version of this operator that deals with proper arcs and closed curves instead of homology cycles. Building on the classical framework of geometric vanishing cycles, we introduce the concept of vanishing arcsets as their counterpart using this geometric var…

Did a quick test fit of one of the Minisforum MS-A2s and ran some of the cabling. I think this should turn out pretty clean and everything fits better than expected which is a good thing. The PSUs will go in the bottom 2U "compartment" without issue which I didn't run.
#minisforum #homelab

Stark Tuning and Charge State Control in Individual Telecom C-Band Quantum Dots
N. J. Martin, A. J. Brash, A. Tomlinson, E. M. Sala, E. O. Mills, C. L. Phillips, R. Dost, L. Hallacy, P. Millington-Hotze, D. Hallett, K. A. O'Flaherty, J. Heffernan, M. S. Skolnick, A. M Fox, L. R. Wilson
https://arxiv.org/abs/2506.07951…

Stark Tuning and Charge State Control in Individual Telecom C-Band Quantum Dots
Telecom-wavelength quantum dots (QDs) are emerging as a promising solution for generating deterministic single-photons compatible with existing fiber-optic infrastructure. Emission in the low-loss C-band minimizes transmission losses, making them ideal for long-distance quantum communication. In this work, we present the first demonstration of both Stark tuning and charge state control of individual InAs/InP QDs operating within the telecom C-band. These QDs are grown by droplet epitaxy and emb…

Sampling Finite Unit Norm Tight Frames Using Symplectic Geometry
Mason Faldet, Clayton Shonkwiler
https://arxiv.org/abs/2505.22847 https://

Sampling Finite Unit Norm Tight Frames Using Symplectic Geometry
Unit-norm tight frames in finite-dimensional Hilbert spaces (FUNTFs) are fundamental in signal processing, offering optimal robustness to noise and measurement loss. In this paper we introduce the Eigenlift algorithm for sampling random FUNTFs. Our approach exploits the symplectic geometry of the FUNTF space, which we characterize as a symplectic reduction of frame space by a symmetry group. We then define a Hamiltonian torus action on this reduced space whose momentum map induces a fiber bundl…

Velocity-modulated drag-trapping of nanoparticles by moving fringe pattern in hollow-core fiber
Soumya Chakraborty, Gordon K. L. Wong, Philip St. J. Russell, Nicolas Y. Joly
https://arxiv.org/abs/2506.04770

Velocity-modulated drag-trapping of nanoparticles by moving fringe pattern in hollow-core fiber
We report optical trapping and transport at atmospheric pressure of nanoparticles in a moving interference pattern in hollow-core photonic crystal fiber. Unlike in previous work at low pressure, when the viscous drag forces are weak and the particles travel at the fringe velocity, competition between trapping and drag forces causes the particle velocity to oscillate as it is momentarily captured and accelerated by each passing fringe, followed by release and deceleration by viscous forces. As a…

The Impact of Cluster Mergers on Galaxy Properties
O\u{g}uzhan \c{C}ak{\i}r, Matt S. Owers, Lucas C. Kimmig, Paul Nulsen, Mina Pak, Gabriella Quattropani, Warrick J. Couch
https://arxiv.org/abs/2506.04799

The Impact of Cluster Mergers on Galaxy Properties
Being the most energetic events in the known universe, the impact of galaxy cluster mergers on the properties of the resident galaxies has yet to be well-understood. In this paper, we investigate the effects of merging environments on star formation in nearby clusters ($0.04

Fabry-Perot-Insensitive Edge Coupling for Robust PIC Characterization
Sammy Noel Parise, Raphael Dube-Demers, David Turgeon, Alireza Geravand, Sophie LaRochelle, Wei Shi
https://arxiv.org/abs/2506.08155

Fabry-Perot-Insensitive Edge Coupling for Robust PIC Characterization
In this work, we investigate the impact of Fabry-Perot (FP) cavities formed between a fiber array and a silicon chip during edge-coupled testing of photonic integrated circuits (PICs). Our results show that subwavelength variations in the distance between the fiber array and the device under test induce coupling efficiency modulations of several tenths of a decibel - challenging current alignment precision and undermining measurement repeatability in wafer-level probing. To address these FP-ind…

This https://arxiv.org/abs/2409.16556 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Twisted Roe algebras and their $K$-theory
In this paper, we introduce a notion of twisted Roe algebra and a twisted coarse Baum-Connes conjecture with coefficients. We will study the basic properties of twisted Roe algebras, including a coarse analogue of the imprimitivity theorem for metric spaces with a structure of coarse fibrations. We show that the twisted coarse Baum-Connes conjecture with coefficients holds for a metric space with a coarse fibration structure when the base space and the fiber satisfy the twisted coarse Baum-Conn…

An optical frequency shifter based on continuous-wave pump fields
Anica Hamer, Frank Vewinger, Michael H. Frosz, Simon Stellmer
https://arxiv.org/abs/2506.05989

An optical frequency shifter based on continuous-wave pump fields
Practical implementations of quantum information networks require frequency conversion of individual photons. Approaches based on a molecular gas as the nonlinear medium cover a wide range of the optical spectrum and promise high efficiency at negligible background. We present polarization-preserving frequency conversion in a hydrogen-loaded hollow core fiber using continuous-wave pump fields. We demonstrate conversion efficiency at the level of a few per mille, discuss various limitations and …

Soliton eigenvalue control by interaction of circularly polarized lights in a nonlinear fiber
Peng Gao, Xiaofang Wang, Sha An, Kai Wen, Juanjuan Zheng, Tanping Li, Peng Gao
https://arxiv.org/abs/2506.07025

Soliton eigenvalue control by interaction of circularly polarized lights in a nonlinear fiber
We propose a physical method for controlling soliton eigenvalues in optical fibers, which is realized through the interaction between circularly polarized lights. Using this method, we not only achieve the decomposition of high-order solitons (HOSs) with different orders, but also realize physical processes of reconstructing HOSs for the first time. Compared with existing methods, our approach ensures accurate measurement of the discrete eigenvalues of HOSs while exhibiting higher decomposition…

A Simple and Novel Passive Double-Sensitivity Optical Gyroscope Based on Non-Reciprocal Polarization Techniques
Onder Akcaalan, Melike Gumus Akcaalan
https://arxiv.org/abs/2506.03498

A Simple and Novel Passive Double-Sensitivity Optical Gyroscope Based on Non-Reciprocal Polarization Techniques
This paper presents a novel interferometric fiber optic gyroscope (IFOG) architecture, the Double-Sensitive Non-Reciprocal Polarization Phase Shifter IFOG (DS-NRPPS-IFOG), which introduces for the first time a fully passive phase biasing scheme capable of simultaneous operation at two quadrature points $π/2$ and $3π/2$. Building upon prior passive biasing techniques, this design uses a Non-Reciprocal Polarization-Dependent Phase Shifter (NRPPS) combined with a double-pass sensing coil arrange…

Frequency-Domain Joint Monitoring of Differential Group Delay and Dependent Loss of Optical Singleand Few-Mode Fiber Channels Based on CAZAC Sequences
Linsheng Fan, Gao Ye, Zhongliang Sun, Lingguo Cao, Hao Shi, Jianwei Tang, Shunfeng Wang, Hengying Xu, Chenglin Bai, Jian Zhao, Weisheng Hu, Jinlong Wei
https://arxiv.org/abs/2505.…

Frequency-Domain Joint Monitoring of Differential Group Delay and Dependent Loss of Optical Singleand Few-Mode Fiber Channels Based on CAZAC Sequences
This paper addresses the challenges of monitoring optical-fiber channels subject to complex, multidimensional impairments-such as dynamic interference across polarization or modal dimensions-where conventional methods suffer from high equipment costs, poor impairment discrimination and limited scalability. We propose an in-service, frequency-domain joint monitoring scheme based on constant-amplitude zero-autocorrelation (CAZAC) sequences. Exploiting their flat spectra and ideal autocorrelation,…

This https://arxiv.org/abs/2505.12876 has been replaced.
initial toot: https://mastoxiv.page/@ar…

What Price Fiber Bundle Substantivalism? On How to Avoid Holes in Fibers
On a mathematically foundational level, our most successful physical theories (gauge field theories and general-relativistic theories) are formulated in a framework based on the differential geometry of connections on principal bundles. After reviewing the essentials of this framework, we articulate the generalized hole and point-coincidence arguments, examining how they weight on a substantivalist position towards bundle spaces. This question, then, is considered in light of the Dressing Field…

Direct laser ablation of 2D material films for fabricating multi-functional flexible and transparent devices
Yigit Sozen, Yu Kyoung Ryu, Javier Martinez, Andres Castellanos-Gomez
https://arxiv.org/abs/2506.03730

Direct laser ablation of 2D material films for fabricating multi-functional flexible and transparent devices
We present a scalable method for direct patterning of graphite and transition metal dichalcogenide (TMD) films on polycarbonate (PC) and other transparent substrates using fiber laser ablation. This process facilitates the fabrication of various functional devices, including strain gauges, supercapacitors, and photodetector arrays, without the need for photolithography or solvents, thereby simplifying device production and enhancing environmental sustainability. Utilizing roll-to-roll mechanica…

Automated Polarization Basis Adjustment and Security Monitoring in Quantum Communication via Coincidence Entropies
Tom\'a\v{s} Nov\'ak, Carlos Guerra-Y\'anez, Mat\v{e}j Holubi\v{c}ka, Josef Vojt\v{e}ch, Josef Bla\v{z}ej
https://arxiv.org/abs/2505.24071

Automated Polarization Basis Adjustment and Security Monitoring in Quantum Communication via Coincidence Entropies
Polarization-sensitive receivers for single photons are of crucial importance in various applications within the fields of quantum communication and quantum sensing, and are more commonly implemented in free-space optics rather than in optical fibers. This is primarily due to the unpredictable and varying birefringence in single-mode optical fibers. We present a method for birefringence compensation in an all-fiber detection setup that relies solely on coincidence measurements of a polarization…