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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Rothe, Stefan Krause, David Zhang, Qian Pohle, Dennis Koukourakis, Nektarios Czarske, Jürgen W. Technische Universitat Dresden Faculty of Electrical and Computer Engineering Laboratory of Measurement and Sensor System Technique Dresden01062 Germany

We show reference-less transmission matrix measurements using a neural network operating with up to 23 modes in real-time. We use synthetic training data enabling optical predistortion through an SLM for light control... 详细信息

ISBN: (纸本)9781957171258

关键词： Light propagation

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3D lensless fiber endoscopy exploiting deep learning and diffractive optical elements

3D lensless fiber endoscopy exploiting deep learning and dif...

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3D Image Acquisition and Display: Technology, Perception and Applications, 3D 2022

作者： Czarske, Juergen W. Glosemeyer, Tom Scharf, Elias Kuschmierz, Robert Laboratory of Measurement and Sensor System Technique TU Dresden Dresden01069 Germany Dresden Germany

This paper presents a paradigm shift in endoscopy using coherent fiber bundles (CFB). The memory effect of CFB is exploited towards 3D endoscopy using printed diffractive optical elements (DOE) and deep neural network... 详细信息

ISBN: (纸本)9781957171098

关键词： Endoscopy

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Securing Data in Multimode Fibers by Exploiting Mode-Dependent Light Propagation Effects

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Research 2023年第3期2023卷 669-682页

作者： Stefan Rothe Karl-Ludwig Besser David Krause Robert Kuschmierz Nektarios Koukourakis Eduard Jorswieck Jürgen W.Czarske TU Dresden Faculty of Electrical and Computer EngineeringLaboratory of Measurement and Sensor System Technique01062 DresdenGermany TU Braunschweig Faculty of Electrical EngineeringInformation TechnologyPhysicsInstitute for Communications Technology38106 BraunschweigGermany TU Dresden Faculty of Physics01062 DresdenGermany

Multimode fibers hold great promise to advance data rates in optical communications but come with the challenge to compensate for modal crosstalk and mode-dependent losses,resulting in strong *** holographic measurement of the transmission matrix enables not only correcting distortions but also harnessing these effects for creating a confidential data connection between legitimate communication parties,Alice and *** feasibility of this physical-layer-security-based approach is demonstrated experimentally for the first time on a multimode fiber link to which the eavesdropper Eve is physically *** the proper structured light field is launched at Alice’s side,the message can be delivered to Bob,and,simultaneously,the decipherment for an illegitimate wiretapper Eve is *** a real communication scenario,we implement wiretap codes and demonstrate confidentiality by quantifying the level of *** to an uncoded data transmission,the amount of securely exchanged data is enhanced by a factor of *** complex light transportation phenomena that have long been considered limiting and have restricted the widespread use of multimode fiber are exploited for opening new perspectives on information security in spatial multiplexing communication systems.

关键词： distortion destroyed holographic

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Smart transmission matrix measurement of multimode fibers using digital holography and deep learning for confidential data transmission

Smart transmission matrix measurement of multimode fibers us...

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Digital Holography and Three-Dimensional Imaging, DH 2022

作者： Rothe, Stefan Zhang, Qian Pohle, Dennis Koukourakis, Nektarios Czarske, Juergen W. TU Dresden Faculty of Electrical and Computer Engineering Laboratory of Measurement and Sensor System Technique Dresden01062 Germany

We present smart measurements of the transmission matrix of multimode fibers (MMF). The modal crosstalk of the MMF is exploited by authorized communication participants against an eavesdropper towards physical layer s... 详细信息

ISBN: (纸本)9781957171128

关键词： Multimode fibers

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Learning to demultiplex the superposition of spatial modes in multimode fiber using physics-informed deep learning

Learning to demultiplex the superposition of spatial modes i...

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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Zhang, Qian Sui, Yuan Rothe, Stefan Czarske, Jürgen W. Laboratory of Measurement and Sensor System Technique TU Dresden Helmholtzstrasse 18 Dresden01069 Germany Institute of Applied Physics School of Science TU Dresden Dresden Germany

We have proposed a physics-informed deep neural network for multimode fiber communication networks. It is able to demultiplex the 55 fiber modes in real-time and without the need for reference light. © Optica Pub... 详细信息

ISBN: (纸本)9781957171296

关键词： Deep learning Fiber networks Fiber optic communications Multimode fibers Neural networks Space division multiplexing

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Compressive holographic sensing simplifies quantitative phase imaging

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Light(Science & Applications) 2023年第6期12卷 946-948页

作者： Jiawei Sun Juergen W.Czarske Competence Center for Biomedical Computational Laser Systems(BIOLAS) TU DresdenDresdenGermany Laboratory of Measurement and Sensor System Technique(MST) TU DresdenHelmholtzstrasse 1801069 DresdenGermany Cluster of Excellence Physics of Life TU DresdenDresdenGermany Institute of Applied Physics TU DresdenDresdenGermany

Quantitative phase imaging (QPI) has emerged as method for investigating biological specimen and technical objects. However, conventional methods often suffer from shortcomings in image quality, such as the twin image artifact. A novel computational framework for QPI is presented with high quality inline holographic imaging from a single intensity image. This paradigm shift is promising for advanced QPI of cells and tissues.

关键词： holographic phase shortcomings

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Step-by-step transfer function reversal for single-shot 3D fiber endoscopy using a diffuser 30

Step-by-step transfer function reversal for single-shot 3D f...

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Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XXX 2023

作者： Glosemeyer, Tom Lich, Julian Kuschmierz, Robert Czarske, Jürgen Laboratory of Measurement and Sensor System Technique TU Dresden Dresden Germany TU Dresden Dresden Germany Else Kröner Fresenius Center for Digital Health TU Dresden Dresden Germany

ISBN: (纸本)9781510658752

Endoscopy through coherent fiber bundles plays a significant role in industrial and medical 2D imaging. By replacing the lens on the distal side with a diffuser, the 3D information of the measurement volume is encoded as 2D speckle patterns on the camera. Neural Networks can then be employed to reconstruct the 3D object. Therefore, minimally invasive single-shot 3D imaging through a flexible low-cost endoscope with a diameter of less than 1 mm is enabled. However, the number of fiber cores is limiting the transferable information and reduces the reconstruction quality. In this paper, separate reconstruction for the diffuser and the coherent fiber bundle for different core numbers is explored. This approach enables biomedical applications for in vivo diagnostics, e.g. with fluorescence imaging in 3D. © 2023 SPIE. All rights reserved.

关键词： Endoscopy

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Single-shot 3D incoherent imaging with diffuser endoscopy

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Light(Advanced Manufacturing) 2024年第2期5卷 64-74页

作者： Julian Lich Tom Glosemeyer Jürgen Czarske Robert Kuschmierz Laboratory of Measurement and Sensor System Technique TU DresdenGermany Competence Center for Biomedical Computational Laser Systems(BIOLAS) TU DresdenGermany Else Kroner Fresenius Center for Digital Health(EKFZ) TU DresdenGermany Cluster of Excellence Physics of Life TU DresdenGermany

Minimally invasive endoscopy offers a high potential for biomedical imaging ***,conventional fiberoptic endoscopes require lens systems which are not suitable for real-time 3D ***,a diffuser is utilized for passively encoding incoherent 3D objects into 2D speckle *** networks are employed for fast computational image reconstruction beyond the optical memory *** this paper,we demonstrate single-shot 3D incoherent fiber imaging with keyhole access at video *** the diffuser fiber endoscope for fluorescence imaging is promising for in vivo deep brain diagnostics with cellular resolution.

关键词： Endoscopy Diffuser Deep learning Coherent fiber bundle Multicore fiber Neural networks Fiber optics Speckle patterns Fluorescence imaging

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Secret Key Generation in Multi-Mode Fiber Channels: Channel measurements and Achievable Rates

Secret Key Generation in Multi-Mode Fiber Channels: Channel ...

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IEEE International Conference on Communications (ICC)

作者： Pin-Hsun Lin Paul Nowitzki Eduard A. Jorswieck Dennis Pohle Juergen Czarske Institute for Communications Technology Technische Universität Braunschweig Germany Laboratory of Measurement and Sensor System Technique Technische Universität Dresden Germany

ISBN: (数字)9781728190549

ISBN: (纸本)9781728190556

Secret keys play a critical role in secure data transmission, and an efficient secret key generation scheme will enhance the secure transmission rate. However, the secret key is a scarce resource for classical encryption schemes like the Rivest-Shamir-Adleman (RSA) cryptosystem and its counterpart in quantum applications, and we should extract it from all possible random sources to maximize the key rate. In this paper, we investigate the achievable rate of the secret key generation (SKG)-channel-model based on an actual measured multi-mode fiber (MMF) channel, where there is an additional public discussion channel between the legitimate parties, which the adversary can perfectly overhear. In particular, we measure the fiber transmission matrix by digital holography. Based on the real measurements, we show that for 55-mode MMF, we can achieve a positive secret key rate at 51.3 bit/channel use with mode-dependent loss (MDL) at 1 dB and transmit power at 20 dBm. This demonstrates the feasibility of SKG in MMF.

关键词： Power measurement Atmospheric measurements Power transmission Holography Particle measurements Propagation losses Optical fiber communication

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Learning to control the complex light propagation through few-mode fiber without a reference wave

Learning to control the complex light propagation through fe...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Stefan Rothe David Krause Qian Zhang Dennis Pohle Nektarios Koukourakis Jürgen W. Czarske Faculty of Electrical and Computer Engineering Laboratory of Measurement and Sensor System Technique Technische Universität Dresden Dresden Germany

ISBN: (纸本)9781957171258

关键词： Few mode fibers Light propagation Modal crosstalk Neural networks Spatial light modulators Transmission measurement

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