Pub Date : 2026-07-01Epub Date: 2026-02-03DOI: 10.1016/j.optcom.2026.132991
Xiaotong Wu , Jiajing Lang , Chenyue Lv , Jintao Bai , Baole Lu
In this work, we build an Erbium-doped fiber laser based on a saturable absorber and nonlinear polarization rotation to generate Q-switched mode-locking (QML) and continuous wave mode-locking (CWML). By adjusting polarization state or pump power, the evolution process from QML to CWML has been observed. Theoretically, the formation mechanism of QML is numerically investigated using the coupled Ginzburg-Landau equations. Additionally, we demonstrated the transition dynamics between QML and CWML with variations in gain or polarization state in simulation. Our results deepen the understanding of single/dual-timescale pulse evolution in mode-locked fiber lasers and establish a foundation for investigating mode-locking nonlinear evolutionary paths.
{"title":"Transition dynamics between Q-switched mode-locking and continuous wave mode-locking","authors":"Xiaotong Wu , Jiajing Lang , Chenyue Lv , Jintao Bai , Baole Lu","doi":"10.1016/j.optcom.2026.132991","DOIUrl":"10.1016/j.optcom.2026.132991","url":null,"abstract":"<div><div>In this work, we build an Erbium-doped fiber laser based on a saturable absorber and nonlinear polarization rotation to generate Q-switched mode-locking (QML) and continuous wave mode-locking (CWML). By adjusting polarization state or pump power, the evolution process from QML to CWML has been observed. Theoretically, the formation mechanism of QML is numerically investigated using the coupled Ginzburg-Landau equations. Additionally, we demonstrated the transition dynamics between QML and CWML with variations in gain or polarization state in simulation. Our results deepen the understanding of single/dual-timescale pulse evolution in mode-locked fiber lasers and establish a foundation for investigating mode-locking nonlinear evolutionary paths.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132991"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-04DOI: 10.1016/j.optcom.2026.132994
Renhao Deng , Qiupin Wang , Ziyi Kang , Pu Ou , Yingke Xie , Dan Lu , Junqi Liu , Zhengmao Wu , Guangqiong Xia
In this work, we propose and experimentally demonstrate a scheme for generating chaotic signals with tunable bandwidth by coupling a distributed feedback laser diode (DFB-LD) to a Si3N4 microring resonator (MRR). In such a scheme, the MRR is utilized as an external cavity for the DFB-LD and provides a wavelength-dependent optical feedback. The reflection response of the MRR is composed of a back-reflection of the bus waveguide facets and a ring waveguide. The former induces sinusoidal modulation of the MRR transmission and reflection, and the latter leads to a narrowband reflection feature that interferes with the facet back-reflection. Via analyzing the time-series, RF spectra, and optical spectra of these outputs, the dynamic states of DFB-LD can be determined under different bias current (IDFB-LD) and attenuation rate (α) of feedback light from the MRR to the DFB-LD. Two cases are investigated: Case I is that the back-reflection of the bus waveguide facets is dominant, and Case II is that two back-reflection pathways interfere. The experimental results show that, under Case I, multiple dynamic states can be observed under different IDFB-LD and α, and the evolution route of the period one (P1) state to chaotic (CO) state is revealed. In particular, when the laser operates at the CO state, the bandwidth of the chaotic signals is highly dependent on IDFB-LD and α. By varying IDFB-LD from 80.00 mA to 130.00 mA and α from 6.97% to 19.2%, the effective bandwidth (EB) of the chaotic signal can be changed within a range of 17.69 GHz to 22.98 GHz. For IDFB-LD and α fixed at 105.00 mA and 7.66%, respectively, the chaotic signals with a maximum EB of 22.98 GHz can be achieved. Under Case II, the DFB-LD is easy to enter a tight locking state with only a minuscule reflection provided by the MRR.
{"title":"Generation of tunable bandwidth chaotic signals using a DFB-LD coupled with a microring resonator","authors":"Renhao Deng , Qiupin Wang , Ziyi Kang , Pu Ou , Yingke Xie , Dan Lu , Junqi Liu , Zhengmao Wu , Guangqiong Xia","doi":"10.1016/j.optcom.2026.132994","DOIUrl":"10.1016/j.optcom.2026.132994","url":null,"abstract":"<div><div>In this work, we propose and experimentally demonstrate a scheme for generating chaotic signals with tunable bandwidth by coupling a distributed feedback laser diode (DFB-LD) to a Si<sub>3</sub>N<sub>4</sub> microring resonator (MRR). In such a scheme, the MRR is utilized as an external cavity for the DFB-LD and provides a wavelength-dependent optical feedback. The reflection response of the MRR is composed of a back-reflection of the bus waveguide facets and a ring waveguide. The former induces sinusoidal modulation of the MRR transmission and reflection, and the latter leads to a narrowband reflection feature that interferes with the facet back-reflection. Via analyzing the time-series, RF spectra, and optical spectra of these outputs, the dynamic states of DFB-LD can be determined under different bias current (I<sub>DFB-LD</sub>) and attenuation rate (α) of feedback light from the MRR to the DFB-LD. Two cases are investigated: Case I is that the back-reflection of the bus waveguide facets is dominant, and Case II is that two back-reflection pathways interfere. The experimental results show that, under Case I, multiple dynamic states can be observed under different I<sub>DFB-LD</sub> and α, and the evolution route of the period one (P1) state to chaotic (CO) state is revealed. In particular, when the laser operates at the CO state, the bandwidth of the chaotic signals is highly dependent on I<sub>DFB-LD</sub> and α. By varying I<sub>DFB-LD</sub> from 80.00 mA to 130.00 mA and α from 6.97% to 19.2%, the effective bandwidth (EB) of the chaotic signal can be changed within a range of 17.69 GHz to 22.98 GHz. For I<sub>DFB-LD</sub> and α fixed at 105.00 mA and 7.66%, respectively, the chaotic signals with a maximum EB of 22.98 GHz can be achieved. Under Case II, the DFB-LD is easy to enter a tight locking state with only a minuscule reflection provided by the MRR.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132994"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-07DOI: 10.1016/j.optcom.2026.133005
Kaijing Hu , Wei Li , Xingrui Su , Yujia Hu , Xinyu Chu , Liyan Huang , Qianggao Hu
In this paper, we first verified through experiments that a 3rd-order Raman fiber amplifier can still achieve gain for signal light without 2nd-order pump seed light, but the efficiency will be reduced compared to using 2nd-order pump light. Even a low power of 2nd-order pump seed light is sufficient to yield a notable signal gain, an average power increase and an average optical signal-to-noise ratio (OSNR) increase. Secondly, we constructed a backward 3rd-order Raman 47 wave 200-km wavelength division multiplexing (WDM) transmission system based on physical information neural network (PINN) through simulation, and conducted experimental verification with an error of less than 1.3 dB. PINN can accurately simulate the evolution process of 3rd-order Raman system signals and enables reverse parameter identification, and has a higher tolerance for boundary conditions. This has important guiding significance for the practical application of 3rd-order Raman amplifiers.
{"title":"Influence of pump seed light on 3rd-order Raman amplifiers and applications of PINN in 3rd-order Raman amplification systems","authors":"Kaijing Hu , Wei Li , Xingrui Su , Yujia Hu , Xinyu Chu , Liyan Huang , Qianggao Hu","doi":"10.1016/j.optcom.2026.133005","DOIUrl":"10.1016/j.optcom.2026.133005","url":null,"abstract":"<div><div>In this paper, we first verified through experiments that a 3rd-order Raman fiber amplifier can still achieve gain for signal light without 2nd-order pump seed light, but the efficiency will be reduced compared to using 2nd-order pump light. Even a low power of 2nd-order pump seed light is sufficient to yield a notable signal gain, an average power increase and an average optical signal-to-noise ratio (OSNR) increase. Secondly, we constructed a backward 3rd-order Raman 47 wave 200-km wavelength division multiplexing (WDM) transmission system based on physical information neural network (PINN) through simulation, and conducted experimental verification with an error of less than 1.3 dB. PINN can accurately simulate the evolution process of 3rd-order Raman system signals and enables reverse parameter identification, and has a higher tolerance for boundary conditions. This has important guiding significance for the practical application of 3rd-order Raman amplifiers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 133005"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-04DOI: 10.1016/j.optcom.2026.132995
Lina Zhou , Hongyun Chen , Shuyao Lei , Caihua Nie , Pengshun Luo
Magnonic frequency combs (MFC), similar to optical frequency combs (OFC), are a set of equidistant frequencies generated through the magnetostrictive effect in cavity magnomechanics (CM). In this paper, we propose a new kind of frequency combs in ferromagnetic yttrium iron garnet (YIG), i.e. the fraction-order MFC, which can be generated in cavity magnomechanical system driven by a control field and two probe fields. We specifically explore the MFC, with a particular emphasis on the enhancement of magnon squeezing in fractional MFC. Additionally, we find that under certain conditions, a stronger probe field results in more lines of the MFC spectrum. These results enhance our understanding of magnetostrictive interactions and magnon squeezing, laying a solid foundation for the application of cavity magnetomechanics of magnon squeezing in precision measurement.
{"title":"Magnon-squeezing-enhanced fractional magnonic frequency combs in cavity magnomechanics","authors":"Lina Zhou , Hongyun Chen , Shuyao Lei , Caihua Nie , Pengshun Luo","doi":"10.1016/j.optcom.2026.132995","DOIUrl":"10.1016/j.optcom.2026.132995","url":null,"abstract":"<div><div>Magnonic frequency combs (MFC), similar to optical frequency combs (OFC), are a set of equidistant frequencies generated through the magnetostrictive effect in cavity magnomechanics (CM). In this paper, we propose a new kind of frequency combs in ferromagnetic yttrium iron garnet (YIG), i.e. the fraction-order MFC, which can be generated in cavity magnomechanical system driven by a control field and two probe fields. We specifically explore the MFC, with a particular emphasis on the enhancement of magnon squeezing in fractional MFC. Additionally, we find that under certain conditions, a stronger probe field results in more lines of the MFC spectrum. These results enhance our understanding of magnetostrictive interactions and magnon squeezing, laying a solid foundation for the application of cavity magnetomechanics of magnon squeezing in precision measurement.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132995"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-05DOI: 10.1016/j.optcom.2026.133000
Hang Chen , Yuchen Zhao , Moyao Yu , Haitao Yang , Zhengjun Liu , Fei Tong
A novel optical image cryptosystem combining extended fractional Fourier transform, Fresnel diffraction, phase modulation and chaotic systems has been proposed in this paper. Due to the nonlinear phase encoding and chaotic scrambling in the color image encryption process, the security of the cryptosystem is strengthened. The system adopts random phase masks, the relative positions of the double-lens system, the propagation distance, and the initial values of chaotic mapping as keys, which strengthen confidentiality. The proposed cryptosystem can be implemented by an electro-optical hybrid setup. Some numerical simulations are implemented to testify the validity and robustness of the proposed cryptosystem for multiple images.
{"title":"Optical color image cryptosystem based on fresnel diffraction and phase modulation in extended fractional Fourier transform domain","authors":"Hang Chen , Yuchen Zhao , Moyao Yu , Haitao Yang , Zhengjun Liu , Fei Tong","doi":"10.1016/j.optcom.2026.133000","DOIUrl":"10.1016/j.optcom.2026.133000","url":null,"abstract":"<div><div>A novel optical image cryptosystem combining extended fractional Fourier transform, Fresnel diffraction, phase modulation and chaotic systems has been proposed in this paper. Due to the nonlinear phase encoding and chaotic scrambling in the color image encryption process, the security of the cryptosystem is strengthened. The system adopts random phase masks, the relative positions of the double-lens system, the propagation distance, and the initial values of chaotic mapping as keys, which strengthen confidentiality. The proposed cryptosystem can be implemented by an electro-optical hybrid setup. Some numerical simulations are implemented to testify the validity and robustness of the proposed cryptosystem for multiple images.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 133000"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-01DOI: 10.1016/j.optcom.2026.132982
Hongda Quan, Lingbao Kong, Shiqing Hua
Transparent samples are ubiquitous in biological and medical research, yet their low intrinsic contrast poses a major challenge for label-free and non-destructive imaging. Quantitative phase microscopy (QPM) addresses this by converting optical phase variations into measurable intensity contrast. However, conventional QPM techniques often require significant modifications to the microscope's illumination or imaging path, resulting in complex system configurations. Additionally, many QPM methods based on structured or coded illumination suffer from insufficient light throughput, which can hinder image acquisition quality and stability. In this work, we present a new enhanced brightfield microscopy approach for label-free QPM, enabled by asymmetric illumination modulated by a cylindrical lens. The cylindrical lens introduces directional modulation in the illumination wavevector, effectively encoding phase information into conventional intensity images. The proposed method can be seamlessly integrated into standard brightfield microscopes with minimal hardware modification, while preserving high illumination efficiency and imposing no additional burden on the imaging sensor. Both simulations and experimental results confirm the feasibility and effectiveness of the approach. This demonstrates that our method offers a novel, low-cost, and easily deployable QPM solution based on conventional brightfield microscopy, with strong potential for applications in biomedical imaging and transparent sample analysis.
{"title":"Enhancing brightfield microscopy for label-free quantitative phase microscopy via asymmetric illumination modulated by cylindrical lens","authors":"Hongda Quan, Lingbao Kong, Shiqing Hua","doi":"10.1016/j.optcom.2026.132982","DOIUrl":"10.1016/j.optcom.2026.132982","url":null,"abstract":"<div><div>Transparent samples are ubiquitous in biological and medical research, yet their low intrinsic contrast poses a major challenge for label-free and non-destructive imaging. Quantitative phase microscopy (QPM) addresses this by converting optical phase variations into measurable intensity contrast. However, conventional QPM techniques often require significant modifications to the microscope's illumination or imaging path, resulting in complex system configurations. Additionally, many QPM methods based on structured or coded illumination suffer from insufficient light throughput, which can hinder image acquisition quality and stability. In this work, we present a new enhanced brightfield microscopy approach for label-free QPM, enabled by asymmetric illumination modulated by a cylindrical lens. The cylindrical lens introduces directional modulation in the illumination wavevector, effectively encoding phase information into conventional intensity images. The proposed method can be seamlessly integrated into standard brightfield microscopes with minimal hardware modification, while preserving high illumination efficiency and imposing no additional burden on the imaging sensor. Both simulations and experimental results confirm the feasibility and effectiveness of the approach. This demonstrates that our method offers a novel, low-cost, and easily deployable QPM solution based on conventional brightfield microscopy, with strong potential for applications in biomedical imaging and transparent sample analysis.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132982"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-07DOI: 10.1016/j.optcom.2026.132996
Yiqun Wang, Hongxia Zhang, Xiaolei Guo, Dagong Jia, Tiegen Liu
Interferometric particle imaging (IPI) has emerged as a powerful non-invasive measurement technique for characterizing irregular particles, yet it faces two fundamental metrological challenges: accurate shape retrieval under low-sampling-rate conditions and ambiguity in 3D orientation determination. To address these measurement bottlenecks, we propose a novel computational measurement framework named Sparsity and Projection-consistency-based Reconstruction (SPR). The SPR framework integrates two key components to enhance measurement robustness and accuracy. First, a wavelet-sparsity-constrained Hybrid Input–Output algorithm overcomes interference pattern overlap and significantly enhances the fidelity of 2D projection measurements under low-sampling conditions. Second, a projection-consistency-based disambiguation approach effectively resolves the 180°orientation measurement uncertainty in multi-view 3D reconstruction without requiring additional hardware, serving as a computational validation step. Both simulations and experiments based on digital micromirror devices (DMD) demonstrate the high measurement performance of our SPR method for micrometer-scale particles, with our setup specifically validating its effectiveness in the 400 to 1000 m range. Experimentally, it achieves an average Jaccard Index exceeding 0.90 for single particles and 0.84 for challenging particle pairs, demonstrating high 2D shape measurement accuracy. For 3D reconstruction tasks, the method maintains an average reprojection accuracy greater than 0.869, confirming its practical utility as a high-fidelity 3D shape measurement tool in complex scenarios.
{"title":"A sparsity and projection-consistency framework for 3D Shape measurement of irregular particles via interferometric imaging","authors":"Yiqun Wang, Hongxia Zhang, Xiaolei Guo, Dagong Jia, Tiegen Liu","doi":"10.1016/j.optcom.2026.132996","DOIUrl":"10.1016/j.optcom.2026.132996","url":null,"abstract":"<div><div>Interferometric particle imaging (IPI) has emerged as a powerful non-invasive measurement technique for characterizing irregular particles, yet it faces two fundamental metrological challenges: accurate shape retrieval under low-sampling-rate conditions and ambiguity in 3D orientation determination. To address these measurement bottlenecks, we propose a novel computational measurement framework named Sparsity and Projection-consistency-based Reconstruction (SPR). The SPR framework integrates two key components to enhance measurement robustness and accuracy. First, a wavelet-sparsity-constrained Hybrid Input–Output algorithm overcomes interference pattern overlap and significantly enhances the fidelity of 2D projection measurements under low-sampling conditions. Second, a projection-consistency-based disambiguation approach effectively resolves the 180°orientation measurement uncertainty in multi-view 3D reconstruction without requiring additional hardware, serving as a computational validation step. Both simulations and experiments based on digital micromirror devices (DMD) demonstrate the high measurement performance of our SPR method for micrometer-scale particles, with our setup specifically validating its effectiveness in the 400 to 1000 <span><math><mi>μ</mi></math></span>m range. Experimentally, it achieves an average Jaccard Index exceeding 0.90 for single particles and 0.84 for challenging particle pairs, demonstrating high 2D shape measurement accuracy. For 3D reconstruction tasks, the method maintains an average reprojection accuracy greater than 0.869, confirming its practical utility as a high-fidelity 3D shape measurement tool in complex scenarios.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132996"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-08DOI: 10.1016/j.optcom.2026.133007
Jiajun Song , Qinghui Zhang , Lei Lu , Chenxia Wan , Cheng Yuan
Three-dimensional (3D) profile measurement of non-Lambertian surfaces within dynamic scenes poses significant challenges for Fringe Projection Profilometry (FPP). Specular reflections characteristic of such surfaces frequently cause image saturation, leading to data voids and incomplete 3D reconstructions, particularly in high-gloss areas. To mitigate these issues, this paper proposes a hybrid methodology integrating single-shot FPP with dynamic Near-field Photometric Stereo (NFPS). Initially, single-shot FPP reconstructs a baseline point cloud primarily capturing non-specular surface regions, inherently leaving data voids where specular highlights occur. Subsequently, a sequence of dynamic photometric images is captured under varying illumination, leveraging pre-estimated object motion, to provide complementary surface information within these previously void regions, a dependency that inherently restricts the framework to dynamic measurement scenarios. The NFPS stage utilizes a dedicated calibration procedure, incorporating a proposed planar target-based method for precise light source localization and spherical harmonics (SH) modeling to represent the anisotropic point light source radiance distribution. Finally, a globally consistent and complete point cloud is generated utilizing a multi-view depth-photometric stereo network. This network is designed to integrate the NFPS-derived surface normal data with the FPP depth data, while simultaneously enforcing boundary constraints provided by the valid FPP depth measurements. Experimental validations performed on a glossy blade, a ceramic component, and a high-reflectivity cup confirm the efficacy of the proposed method in achieving high-fidelity reconstruction for dynamic objects with challenging optical properties.
{"title":"Synergistic integration of structured light and kinematic MVPS for 3D measurement of dynamic specular surfaces","authors":"Jiajun Song , Qinghui Zhang , Lei Lu , Chenxia Wan , Cheng Yuan","doi":"10.1016/j.optcom.2026.133007","DOIUrl":"10.1016/j.optcom.2026.133007","url":null,"abstract":"<div><div>Three-dimensional (3D) profile measurement of non-Lambertian surfaces within dynamic scenes poses significant challenges for Fringe Projection Profilometry (FPP). Specular reflections characteristic of such surfaces frequently cause image saturation, leading to data voids and incomplete 3D reconstructions, particularly in high-gloss areas. To mitigate these issues, this paper proposes a hybrid methodology integrating single-shot FPP with dynamic Near-field Photometric Stereo (NFPS). Initially, single-shot FPP reconstructs a baseline point cloud primarily capturing non-specular surface regions, inherently leaving data voids where specular highlights occur. Subsequently, a sequence of dynamic photometric images is captured under varying illumination, leveraging pre-estimated object motion, to provide complementary surface information within these previously void regions, a dependency that inherently restricts the framework to dynamic measurement scenarios. The NFPS stage utilizes a dedicated calibration procedure, incorporating a proposed planar target-based method for precise light source localization and spherical harmonics (SH) modeling to represent the anisotropic point light source radiance distribution. Finally, a globally consistent and complete point cloud is generated utilizing a multi-view depth-photometric stereo network. This network is designed to integrate the NFPS-derived surface normal data with the FPP depth data, while simultaneously enforcing boundary constraints provided by the valid FPP depth measurements. Experimental validations performed on a glossy blade, a ceramic component, and a high-reflectivity cup confirm the efficacy of the proposed method in achieving high-fidelity reconstruction for dynamic objects with challenging optical properties.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 133007"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-09DOI: 10.1016/j.optcom.2026.132987
Ondřej Mokrý , Petr Dejdar , Martin Čížek , Pavel Rajmic , Jiří Schimmel , Tomáš Horváth , Petr Münster , Ondřej Číp
The paper investigates the feasibility of capturing human speech using standard telecommunication optical fibers in real-world installations. We compare three acoustic sensing approaches—the Michelson interferometer (MI) and the distributed acoustic sensing (DAS) in intensity (single-pulse) and phase (dual-pulse) modes—and evaluate their performance using the Speech Transmission Index, the Short-Time Objective Intelligibility, and the neurogram similarity index measure.
Results show that while all systems can detect the presence and temporal structure of speech, none technique of them achieved intelligible reconstruction under realistic conditions. The MI delivered the highest speech quality metrics, and dual-pulse mode of DAS outperformed the single-pulse mode in terms of sensitivity and the signal-to-noise ratio. The findings highlight the current limitations of fiber-based acoustic sensing for direct speech monitoring but confirm its potential for applications such as speaker activity detection and event classification.
{"title":"Possibilities and limitations of speech acoustic sensing using fiber optics: Comparison of interferometric and distributed approaches","authors":"Ondřej Mokrý , Petr Dejdar , Martin Čížek , Pavel Rajmic , Jiří Schimmel , Tomáš Horváth , Petr Münster , Ondřej Číp","doi":"10.1016/j.optcom.2026.132987","DOIUrl":"10.1016/j.optcom.2026.132987","url":null,"abstract":"<div><div>The paper investigates the feasibility of capturing human speech using standard telecommunication optical fibers in real-world installations. We compare three acoustic sensing approaches—the Michelson interferometer (MI) and the distributed acoustic sensing (DAS) in intensity (single-pulse) and phase (dual-pulse) modes—and evaluate their performance using the Speech Transmission Index, the Short-Time Objective Intelligibility, and the neurogram similarity index measure.</div><div>Results show that while all systems can detect the presence and temporal structure of speech, none technique of them achieved intelligible reconstruction under realistic conditions. The MI delivered the highest speech quality metrics, and dual-pulse mode of DAS outperformed the single-pulse mode in terms of sensitivity and the signal-to-noise ratio. The findings highlight the current limitations of fiber-based acoustic sensing for direct speech monitoring but confirm its potential for applications such as speaker activity detection and event classification.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132987"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-02DOI: 10.1016/j.optcom.2026.132970
Masato Shotoku, Fan Wang, Tomoyoshi Ito, Tomoyoshi Shimobaba
This study proposes a holographic signal converter that transforms existing video equipment such as game consoles, televisions, and computers into holographic displays. This converter transforms the two-dimensional (2D) video signal output from existing video equipment into a three-dimensional (3D) hologram signal without any changes to the video equipment itself. This conversion uses a deep neural network to estimate the depth and a layer method to generate a hologram from the RGB and inferred depth images. Real-time conversion of a 2D video signal to a 3D hologram signal was achieved using the constructed holographic signal converter. We demonstrate a real-time holographic 3D TV game with a PlayStation 5 using our holographic signal converter.
{"title":"Holographic signal converter for existing two-dimensional video equipment","authors":"Masato Shotoku, Fan Wang, Tomoyoshi Ito, Tomoyoshi Shimobaba","doi":"10.1016/j.optcom.2026.132970","DOIUrl":"10.1016/j.optcom.2026.132970","url":null,"abstract":"<div><div>This study proposes a holographic signal converter that transforms existing video equipment such as game consoles, televisions, and computers into holographic displays. This converter transforms the two-dimensional (2D) video signal output from existing video equipment into a three-dimensional (3D) hologram signal without any changes to the video equipment itself. This conversion uses a deep neural network to estimate the depth and a layer method to generate a hologram from the RGB and inferred depth images. Real-time conversion of a 2D video signal to a 3D hologram signal was achieved using the constructed holographic signal converter. We demonstrate a real-time holographic 3D TV game with a PlayStation 5 using our holographic signal converter.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132970"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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