Optics Communications最新文献

{"title":"Electro-optically cavity-dumped Ho:YAG laser with wavelengths switching between 2090nm and 2122nm","authors":"Na Chen ,&nbsp;Zhen-Ling Li ,&nbsp;Jing-Ya Zhang ,&nbsp;Ao-Nan Zhang ,&nbsp;Ke Liu ,&nbsp;Yang Kou ,&nbsp;Xiao-Jun Wang","doi":"10.1016/j.optcom.2025.132095","DOIUrl":"10.1016/j.optcom.2025.132095","url":null,"abstract":"<div><div>A wavelength switchable cavity dumped nanosecond (ns) Ho:YAG laser is demonstrated. A rubidium titanyl phosphate (RTP) electro-optic cell is combined with a thin film polarizer (TFP) for cavity dumping operating at 10 kHz repetition rate. By finely rotating the TFP, the intracavity loss for different wavelength peak around 2.1 μm is accurately controlled, and the laser can be selectively operated at 2090.31 nm and 2122.41 nm, respectively. The output characteristics are almost similar for both of the two wavelengths. The pulse width is kept at approximately 4.5 ns. When the incident pump power is 21.8 W, the maximum average output power of 7.3 W is achieved, corresponding to a maximum pulse energy of 0.73 mJ.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132095"},"PeriodicalIF":2.2,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254899","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}

{"title":"DNASM -TID: Atmospheric scattering model construction based on light source distance and image dehazing for nighttime traffic scenes","authors":"Xingang Wang ,&nbsp;Junwei Tian ,&nbsp;Yalin Yu ,&nbsp;Qin Wang ,&nbsp;Yupeng Feng ,&nbsp;Haokai Gao ,&nbsp;Irene Korkor Nyengor Agbenu ,&nbsp;Shifan Yu","doi":"10.1016/j.optcom.2025.132093","DOIUrl":"10.1016/j.optcom.2025.132093","url":null,"abstract":"<div><div>Nighttime traffic scene image dehazing has an important application value for nighttime traffic driving and security monitoring activities. Aiming at the existing nighttime image dehazing optical model for the non-uniform distribution of artificial light sources is not enough to consider the problems of halo and uneven illumination in the dehazed image. A nighttime image imaging atmospheric scattering model based on the distance of the light source is constructed. An image dehazing algorithm for nighttime traffic scenes is proposed based on the constructed optical model. Firstly, the near light source region in the foggy image at nighttime is segmented based on Gaussian pyramid, and in order to deal with the scattering effect of artificial light source more accurately, a discriminative index for the proximity of scene pixels to the center of the light source is proposed. Then, the atmospheric light matrix conforming to the regional distribution of light sources is estimated using Gaussian low-pass filtering, and to obtain a more accurate atmospheric light matrix, a channel map is constructed as a guided map by utilizing the luminance and saturation components of the image, and fast guided filtering is carried out on the preliminarily obtained atmospheric light matrix. Subsequently, the transmittance matrices of the near-source and far-source regions are solved using the bright and dark channel a priori, respectively. The optimal fusion model with <em>L</em>₂ norm regularization is established to solve the fused transmittance matrix. To avoid the block partition effect in the process of transmittance fusion, anisotropic Gaussian filtering is carried out on the fused transmittance matrix. Finally, a dark-adaptive adjustment function is designed to adaptively adjust the image's brightness level after dehazing. The experimental results show that the proposed nighttime traffic scene image dehazing algorithm dehazes the image after the subjective visual effect of dehazing more thoroughly, at the same time, effectively mitigates the problem of uneven halo and luminance distribution. Compared with other nighttime image dehazing algorithms, it shows substantial superiority in subjective and objective evaluation experiments.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132093"},"PeriodicalIF":2.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241210","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}

{"title":"Propagation of modified anomalous vortex beams in a gradient-index medium","authors":"Bikash K. Das ,&nbsp;Camilo Granados ,&nbsp;Marcelo F. Ciappina","doi":"10.1016/j.optcom.2025.132030","DOIUrl":"10.1016/j.optcom.2025.132030","url":null,"abstract":"<div><div>Modified anomalous vortex (MAV) beams are orbital angular momentum (OAM)-carrying light beams with controlled self-focusing properties. We investigate the propagation of MAV beams in a gradient-index (GRIN) medium. Based on the Huygens-Fresnel integral and ABCD matrix, we derive an analytical expression for the complex amplitude of the MAV beam propagating in a GRIN medium. The effects of the topological charge (TC), the order of the vortex beam, the modification parameter, the gradient-index parameter, and the refractive index of the medium axis on the intensity distributions of the MAV beam are numerically studied. The propagation trajectory and intensity distributions are shown to change periodically in the GRIN medium with increasing propagation distances. The gradient index parameter also determines the periodic values of the MAV beams during propagation, and the period of evolution decreases as the value of the gradient index parameter increases. Moreover, the refractive index at the symmetry axis has little effect on the focusing intensity of the MAV beam and does not influence the maximum radius of the bright ring as the beam propagates through the GRIN medium. The results presented in this paper may be useful for applications of MAV beams in optical guiding, optical communication, and laser optics.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132030"},"PeriodicalIF":2.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255389","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}

{"title":"Recent advances in ring-core fiber for orbital-angular-momentum-based mode-division multiplexing","authors":"Wenqian Zhao ,&nbsp;Yingning Wang ,&nbsp;Haoyang Ren ,&nbsp;Wenpu Geng ,&nbsp;Yuanpeng Liu ,&nbsp;Zhongqi Pan ,&nbsp;Yang Yue","doi":"10.1016/j.optcom.2025.132091","DOIUrl":"10.1016/j.optcom.2025.132091","url":null,"abstract":"<div><div>Orbital angular momentum (OAM) modes constitute a complete basis set for the spatial distribution of electromagnetic fields. By exploiting the orthogonality of OAM modes, optical fiber communication systems can establish independent transmission channels, thereby substantially expanding system capacity. Furthermore, the combination of OAM mode-division multiplexing (MDM) with other multiplexing techniques, such as wavelength-division multiplexing (WDM), offers the potential to reduce the complexity of multiple-input multiple-output (MIMO) processing and further enhance fiber-based communication capacity. In this paper, we review the advantages of OAM mode transmission in ring-core fibers, discuss the design strategies that enable the support of multiple OAM modes while maintaining low crosstalk, and introduce OAM-based MDM communication systems aimed at boosting overall transmission capacity.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132091"},"PeriodicalIF":2.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536007","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}

{"title":"Indoor visible light positioning system driven by deep neural network based on kalman filtering and clustering optimization","authors":"Xiaotong Mao,&nbsp;Lei Jing,&nbsp;Zhengrong Tong,&nbsp;Weihua Zhang,&nbsp;Peng Li,&nbsp;Xue Wang,&nbsp;Hao Wang,&nbsp;Tianyi Cao,&nbsp;Zhen Sun","doi":"10.1016/j.optcom.2025.132090","DOIUrl":"10.1016/j.optcom.2025.132090","url":null,"abstract":"<div><div>With the continuous development of indoor positioning technology, indoor visible light positioning as an emerging positioning scheme has gradually become an emerging and promising field with its high accuracy and low cost. However, visible light is easily affected by environmental noise and reflections from indoor boundary walls, which reduces the accuracy and system robustness of indoor visible light positioning. To solve this problem, K-medoids clustering and Kalman filtering are introduced in this paper, which effectively reduce the adverse effect of noise and the problem of large errors in edge position positioning, finally, the positioning accuracy and system robustness are further improved by deep neural network training. After the experimental simulation, the positioning accuracy reached 1.3 cm, and compared with the other nine common indoor visible light positioning schemes, the positioning scheme proposed in this paper has obvious advantages in terms of positioning accuracy and system robustness.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132090"},"PeriodicalIF":2.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365879","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}

{"title":"Simultaneous detection of refractive index and sound velocity in liquid solvents using topological interface states in phoxonic crystal waveguides","authors":"Yuankun Ji,&nbsp;Yiming Song,&nbsp;Tianren Lin,&nbsp;Tian-Xue Ma","doi":"10.1016/j.optcom.2025.132026","DOIUrl":"10.1016/j.optcom.2025.132026","url":null,"abstract":"<div><div>Topologically protected boundary states in artificially photonic and phononic materials offer a promising platform for the design of robust wave devices due to their inherent immunity to structural perturbations. In this study, we propose phoxonic crystal (PxC) waveguides for simultaneous guidance of electromagnetic and acoustic waves, and numerically investigate their wave characteristics using finite element analysis. It is demonstrated that both the topologically trivial and non-trivial phases could be realized by varying the PxC waveguides’ geometric parameters, enabling the creation of PxC structures supporting the zero-dimensional topological interface states (TISs) for both electromagnetic and acoustic waves. The developed TISs are subsequently applied for the detection of refractive index and sound velocity of water/1-propanol mixtures with different concentrations. Notably, the sensing performance of the topological PxC waveguides maintain remarkable stability against intentionally introduced structural perturbations.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132026"},"PeriodicalIF":2.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241212","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}

{"title":"Ultrafast-pumped temperature response in in-line cascaded quasi-phase-matching optical second harmonic","authors":"Yuhang He ,&nbsp;Dan Yu ,&nbsp;Yan Li ,&nbsp;Hongpeng Liu ,&nbsp;Weiji He ,&nbsp;Qian Chen","doi":"10.1016/j.optcom.2025.132088","DOIUrl":"10.1016/j.optcom.2025.132088","url":null,"abstract":"<div><div>We have proposed and experimentally demonstrated a bus temperature sensor array based on nonlinear optics second harmonic generation (SHG) in periodically poled lithium niobate (PPLN) and wavelength coded with poling period. The temperature response on bulk PPLN is studied by interrogating SHG spectra. Group dispersion factor and efficient thermal-birefringence between fundamental wave and second harmonic wave are proposed to describe peak wavelength shift. Single temperature sensor capitalizing on mode-locked laser provides 0.11 nm/°C sensitivity, 80 °C dynamic range around room temperature, and 2 °C temperature resolution. Additionally, a wavelength-coded 1 × 4 sensor array is demonstrated via quasi-comb spectra induced by poling period engineering. Each sensing unit has a unique poling period and SHG peak wavelength which can shift independently, and the temporal-evolved joint spectra of two non-cooperative targets confirm the practicability. The arrayed temperature sensors validate great applying potential on photonic integrated circuits (PIC).</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132088"},"PeriodicalIF":2.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279557","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}

{"title":"Optimal control of redshift of high-order harmonic in two-color laser fields","authors":"Guang-Rui Jia,&nbsp;Hui-Xia Kang,&nbsp;Ze-Hui Liu","doi":"10.1016/j.optcom.2025.132069","DOIUrl":"10.1016/j.optcom.2025.132069","url":null,"abstract":"<div><div>High-order harmonic generation (HHG) from the polar diatomic molecule HeH²⁺ is investigated by time-dependent Schrödinger equation (TDSE) in the few-cycle two-color laser (TCL) fields. The impact of the phase difference and inhomogeneity of the TCL fields on HHG was elucidated in this paper. The phase difference affects the rising and falling part and the asymmetry of the TCL field to modulate the occurrence of non-adiabatic redshift. The redshift variations with a period of π as the phase difference changes and the redshift amplitude is the largest when the phase difference is 0.5π. The phase difference also affects the recombination of electrons with adjacent ions, the maximum kinetic energies change increases with the increase of phase difference that can make the high-order harmonic spectrum broaden. The inhomogeneity modifies the laser field distribution, inducing observable modulations in the redshift magnitude of high-order harmonics. Crucially, with a fixed phase difference, controlled enhancement of the inhomogeneity within an optimal range significantly amplifies the redshift. We can optimize of redshift tuning in HHG by these adjustments above.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132069"},"PeriodicalIF":2.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263686","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}

{"title":"Exploration of AI security: Application of a novel chaotic map 2D- SCD in the two-dimensional spatial mirror projection algorithm","authors":"Zhenlong Man ,&nbsp;Yu Dai ,&nbsp;Tengyuan Liu ,&nbsp;Xiangfu Meng","doi":"10.1016/j.optcom.2025.132023","DOIUrl":"10.1016/j.optcom.2025.132023","url":null,"abstract":"<div><div>Artificial intelligence technology has broad prospects, and there are numerous researches related to computer vision. Ensuring the security of training image data for artificial intelligence models has become a research hotspot. In view of the characteristics of continuity and large amount of data of training images, this paper designs a new lightweight Two-dimensional Chaotic Map(2D-SCD) as a key generator. While ensuring the randomness of the key, it reduces the complexity of the chaotic system. The superiority of this chaotic map is proved through a series of performance analyses. In addition, this paper also proposes a random mirror mapping image security research scheme. Firstly, combined with the proposed Quadrature Amplitude Modulation(QAM), pixels of different blocks are migrated between blocks with different random waveforms to break the correlation between adjacent pixels. Afterwards, a chaotic system is used to generate a random mirror. By decomposing the key and pixel value in a 2D space, the key constitutes a spatial mirror, and the pixel value generates a diffusion value through the projection of this spatial mirror, thereby achieving the hiding of plaintext information. Simulation outcomes demonstrate that the suggested encryption method can successfully safeguard image security in the context of artificial intelligence.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132023"},"PeriodicalIF":2.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241209","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}

{"title":"Spectral efficiency optimization for optical IRS assisted multi-user MISO beamforming-based indoor visible light communication systems","authors":"Qi Liu,&nbsp;Fengyuan Shi,&nbsp;Ping Wang,&nbsp;Ting Yang,&nbsp;Yanzhe Sun,&nbsp;Hanlin Su","doi":"10.1016/j.optcom.2025.132005","DOIUrl":"10.1016/j.optcom.2025.132005","url":null,"abstract":"<div><div>In this work, a novel spectral efficiency (SE) optimization scheme has been proposed to improve the performance of the optical intelligent reflective surface (OIRS) assisted multi-user multi-input single-output (MISO) beamforming-based indoor visible light communication (VLC) system. Specifically, by jointly optimizing the transmit beamforming (BF) and OIRS assignment, an overall SE maximization problem has been formulated, which is subject to the communication quality of service (QoS) requirement for each user, OIRS configuration constraints, and the direct current (DC) bias constraints of the light-emitting diodes (LEDs). In order to tackle this formulated non-convex problem, the original problem is decomposed into the transmit BF and OIRS assignment sub-problems, which are transformed by variable transformations and first-order Taylor expansions, and then the successive convex approximation (SCA)-based semidefinite relaxation (SDR) algorithm and the SCA-based relaxed greedy algorithm are proposed to solve these two transformed sub-problems, respectively. Subsequently, the alternating optimization (AO) algorithm is adopted to solve the sub-problems alternatively until convergence. Simulation results demonstrate that for 48 OIRS units, the proposed scheme could improve the overall SE by approximately 4.24 bps/Hz, 4.19 bps/Hz, 3.74 bps/Hz and 2.70 bps/Hz, respectively, compared to that of the location-assisted interior-point (LIP) algorithm-based OIRS assignment scheme, the distance-greedy OIRS assignment scheme, the random OIRS assignment scheme and the scheme without OIRS under the noise power of <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>10</mn></mrow></msup></mrow></math></span> W. This work will benefit the research and development of indoor VLC systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132005"},"PeriodicalIF":2.2,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221501","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}