Optics Communications最新文献

{"title":"Improved phase generated carrier demodulation algorithm for vibration sensing system based on distributed feedback fiber laser","authors":"Fenghong Chu,&nbsp;Jiaxiang Zhang,&nbsp;Zhenglan Bian,&nbsp;Anduo Hu,&nbsp;Shumin Peng,&nbsp;Wang Yao,&nbsp;Siwen Cai","doi":"10.1016/j.optcom.2025.132098","DOIUrl":"10.1016/j.optcom.2025.132098","url":null,"abstract":"<div><div>This paper presents a vibration sensing system based on distributed feedback fiber laser (DFB-FL), and proposes an improved phase generated carrier (PGC) demodulation algorithm incorporating single frequency information extraction (SFIE) and harmonic mixing. The SFIE module dynamically extracts carrier frequency features from the interference signal, thereby enabling the real-time reconstruction of three harmonic signals to compensate for carrier phase delay. Subsequently, the harmonic mixing process mitigates distortions induced by modulation depth drift and light intensity disturbance (LID). Experimental results show the signal-to-noise ratio (SNR) of the proposed algorithm is 84.24 dB when demodulating 800 Hz vibration signal, exceeding the SFIE-DCM and SFIE-Arctan algorithms by 21.45 dB and 11.95 dB, respectively. During 60 s of continuous monitoring, the standard deviations of signal-to-noise-and-distortion ratio (SINAD) is 0.01856 dB, the total harmonic distortion (THD) is 0.00331 %, and the demodulated signal amplitude is 0.00142 rad. The acceleration sensitivity of the system is 37.8619 rad/(m/s²)@800 Hz. The proposed algorithm is computationally efficient, easy to implement and stable, providing a reliable signal processing solution for practical applications in fiber optic interferometric vibration sensing systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132098"},"PeriodicalIF":2.2,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297123","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":"Temperature compensated optical fiber current sensing system based on a two-tap microwave photonic filter","authors":"Yi Zhuang ,&nbsp;Wenzhao Liu ,&nbsp;Tongtong Xie ,&nbsp;Shuaihua Gao ,&nbsp;Shiwei Liu ,&nbsp;Weiyu Dai ,&nbsp;Hua Wang ,&nbsp;Hongyan Fu","doi":"10.1016/j.optcom.2025.132106","DOIUrl":"10.1016/j.optcom.2025.132106","url":null,"abstract":"<div><div>In this paper, a two-tap microwave photonic filter (MPF) based temperature compensated optical fiber current sensing system has been proposed and experimentally demonstrated. Two fiber Bragg gratings (FBGs) are employed in the experiment, and the light signals modulated by radio-frequency (RF) signals reflected by two FBGs can be treated as two tap signals, which enter the dispersion-compensated fiber for the delay and beat through the photodetector to recover the RF signals, then a two-tap MPF is formed. Two FBGs are considered as the sensing and temperature compensation elements, respectively. The sensing FBG is affixed on the Terfenol-D. The variation of the current applied to the solenoid changes the magnetic field, and axial stretching strain is generated on the sensing element and sensing FBG's wavelength will change, which results in the shifts of the dip frequency of the MPF, by measuring which the current can be demodulated. Meanwhile, applying current will cause internal heating of the solenoid, and to further reduce the effect of the variation of temperature on current measurement, the temperature compensation FBG is affixed on the temperature compensated material Monel-400, and both two FBGs are placed inside the solenoid and good temperature compensation can be obtained. In the three-time repetitive continuous experiment, the current sensitivity as current increases of the system with temperature compensation is 4.23 MHz/A. The current measurement errors of the systems without and with temperature compensation are 0.83 A and 0.12 A, respectively. Our proposed system offers the advantages of easy fabrication, high current resolution with temperature compensation, good repeatability and high system stability, high current measurement precision, etc.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132106"},"PeriodicalIF":2.2,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312706","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":"Enhanced second harmonic generation in hybrid MoS2/Au/MoS2 and MoS2/SiO2/MoS2 Langmuir-Blodgett films","authors":"Cédric Lambin ,&nbsp;Wensen Wang ,&nbsp;Gilles Pécastaings ,&nbsp;Damien Voiry ,&nbsp;Serge Ravaine ,&nbsp;François Lagugné-Labarthet","doi":"10.1016/j.optcom.2025.132100","DOIUrl":"10.1016/j.optcom.2025.132100","url":null,"abstract":"<div><div>Transition metal dichalcogenides have gained much attention due to their semiconducting properties, enabling a wealth of applications that integrate these 2D materials. Optical properties such as luminescence and nonlinear optical properties are of particular interest for photonic applications despite the small surface of the individual exfoliated flakes or the inherent difficulty to mechanically transfer flakes grown by CVD onto a given substrate. Herein, we investigate the Langmuir-Blodgett transfer of exfoliated MoS₂ flakes deposited onto glass coverslips. Intercalation of Au and SiO₂ nanoparticles between 2 layers of MoS₂ was conducted using successive LB deposition, enabling the formation of heterostructures films with conductor and dielectric materials. The properties of these films were investigated using Raman spectroscopy and second harmonic generation (SHG) microscopy. The multilayers films are transferred on ∼ cm² surface area with good coverage but with uncontrolled crystalline orientation of the MoS₂ flakes. Raman enhancement of MoS₂ was evidenced when Au nanoparticles are intercalated between two layers of MoS₂. Polarized SHG microscopy shows a transition from quadrupolar response of the MoS₂ flake driven by their D_3h symmetry to a dipolar polarized response driven by the Au nanoparticles.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132100"},"PeriodicalIF":2.2,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270914","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":"Highly sensitive lossy mode resonance sensor based on perovskite-coated D-shaped fiber","authors":"Leilei Ma ,&nbsp;Ying He ,&nbsp;Run Xu ,&nbsp;Yanfang Yang ,&nbsp;Feng Hong ,&nbsp;Yan Zhu","doi":"10.1016/j.optcom.2025.132031","DOIUrl":"10.1016/j.optcom.2025.132031","url":null,"abstract":"<div><div>We propose a D-shaped optical fiber sensor with the perovskite coating excited by lossy mode resonance (LMR). MAPbI₃ is a promising candidate for perovskite fiber sensors. LMRs produced by MAPbI₃ coating are demonstrated by the transmission spectra in the near infrared wavelength. The sensor can detect a wide range of surrounding refractive indices from 1 to 1.448, and the loss spectra of Y-polarization and X-polarization modes can be clearly distinguished. The position of the resonance peak can be adjusted by varying the film thickness to regulate the detection range and improve detection accuracy. The resonance width is reduced by adjusting the residual cladding thickness due to the light coupling at LMRs transmitted through the D-shaped optical fiber core to the perovskite coating. The maximum sensitivity reaches up to 35,000 nm/RIU and the maximum figure of merit is 925.68 RIU⁻¹ in the perovskite fiber sensor. Compared with D-shaped optical fiber sensors with conventional materials, the proposed sensor with perovskite coating shows superior sensing performance. Perovskite-based LMR sensing is a productive way to contribute to resonance optical fiber sensing technology and may make a breakthrough in the development of miniaturization, high detection accuracy and multi-target detection.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132031"},"PeriodicalIF":2.2,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270913","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":"Scattering properties of multilayer chiral particles by Hermite-Gaussian beams","authors":"Jing Bai ,&nbsp;Cheng-Xian Ge ,&nbsp;Tan Qu ,&nbsp;Zheng-Jun Li ,&nbsp;Qing-Chao Shang ,&nbsp;Wen-Hao Ma ,&nbsp;Zhen-Sen Wu","doi":"10.1016/j.optcom.2025.132092","DOIUrl":"10.1016/j.optcom.2025.132092","url":null,"abstract":"<div><div>This study, based on the Generalized Lorenz-Mie Theory (GLMT), focuses on the scattering trait of multilayer chiral spherical particles in the presence of high-order Hermite-Gaussian beam (HGB). The spherical vector wave functions (SVWFs) of high-order HGBs were derived using the complex source point method and extended to arbitrary directions through the coordinate rotation theorem. By substituting the beam expressions into the electromagnetic field boundary continuity conditions and combining them with the iterative relationships of multilayer sphere, the scattering coefficients for each region of the multilayer sphere were calculated. To verify the accuracy of the algorithm and theoretical framework, we simplified the beam and particle models and compared the results with those in existing literature. The study thoroughly examined the effects of various factors, including beam order, incidence angle, particle chirality, waist radius, polarization angle, and number of layers, on the near-field, internal-field, and far-field scattering results. These research findings provide significant theoretical and experimental guidance for the identification and manipulation of multilayer biological particle structures.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132092"},"PeriodicalIF":2.2,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279558","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":"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}