Optics Communications最新文献

{"title":"Experimental demonstration of enhanced coherent free-space optical communications with optical frequency comb in atmospheric turbulence","authors":"Lu Zhang","doi":"10.1016/j.optcom.2025.132511","DOIUrl":"10.1016/j.optcom.2025.132511","url":null,"abstract":"<div><div>In this paper, an optical frequency comb (OFC) based wavelength division multiplexing (WDM) scheme for coherent free-space optical (FSO) communications in atmospheric turbulence was proposed. In the scheme, by exploiting the broadband phase coherence of comb lines and the correlation of phase noise for different wavelength channels, a phase noise sensing (PNS) channel was constructed to perceive the phase noise for all of the information symbols even in different wavelength channels. In other words, the estimated phase noise in PNS channel can compensate the phase noise in other wavelength channels regardless of whether the span between the PNS channel and other wavelength channel was small or big. An experiment was built to validate the scheme. The experimental results showed that great improvement of bit error rate performance can be brought by the proposed scheme, namely, the WDM based coherent FSO communications with OFC was enhanced.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132511"},"PeriodicalIF":2.5,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221539","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":"StableCam: Lensless imaging with stable diffusion model-based reconstruction","authors":"Di Xiao ,&nbsp;Qiangyu Cai ,&nbsp;Zifeng Xiao ,&nbsp;Wenting Gu ,&nbsp;Shouyu Chai ,&nbsp;Yunlu Sun ,&nbsp;Xin Liu","doi":"10.1016/j.optcom.2025.132503","DOIUrl":"10.1016/j.optcom.2025.132503","url":null,"abstract":"<div><div>Lensless imaging offers low-cost camera miniaturization by replacing traditional lenses with coded masks, enabling applications across diverse domains. However, its reconstruction quality is often constrained by the ill-conditioned nature of the inverse problem. In this paper, we present <strong>StableCam</strong>, a lensless imaging system employing a Modified Uniform Redundant Array (MURA) mask and a physically interpretable reconstruction network, <strong>StaRNet</strong>. StaRNet integrates a separable initialization module based on the lensless imaging model, which provides preliminary reconstructions with reduced computational complexity. Additionally, it includes a parameter-efficient image enhancement module that improves resolution and refines details. The experimental results demonstrate that the proposed StableCam enables to achieve high-quality reconstruction under both calibration and random matrix conditions. Compared to the previous lensless method, e.g., FlatNet, our approach achieves improvements across all evaluation metrics, including peak signal-to-noise ratio (PSNR), structural similarity index measure (SSIM), perceptual image patch similarity (LPIPS), and Fréchet inception distance (FID).</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132503"},"PeriodicalIF":2.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159254","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":"Intelligent and efficient task-aligned nonlinear compensation for coherent optical fiber communication systems","authors":"Yutong Pan ,&nbsp;Tianhong Zhang ,&nbsp;Xiansong Fang ,&nbsp;Yixiao Zhu ,&nbsp;Chuanchuan Yang ,&nbsp;Xian Zhou ,&nbsp;Fan Zhang","doi":"10.1016/j.optcom.2025.132490","DOIUrl":"10.1016/j.optcom.2025.132490","url":null,"abstract":"<div><div>Fiber Kerr nonlinearity remains a critical bottleneck in high-capacity long-haul coherent optical communication systems, highlighting the importance of developing compensation schemes that balance performance and computational efficiency. Recently, neural network-based equalizers have attracted increasing attention due to their powerful nonlinear modeling capability. However, existing neural network-based methods often lead to undesired constellation deformation, compromising symbol integrity and limiting system reliability. We propose Task-Aligned center-oriented gated recurrent unit (Co-GRU), a low-complexity nonlinear compensation method that simultaneously addresses nonlinear distortion and constellation deformation through a task-coordinated strategy. In contrast to existing neural approaches that handle these objectives in isolation, our method integrates them into a unified optimization process, effectively decoupling compensation from geometric distortion and achieving accurate equalization. The method is experimentally assessed in both single-channel and wavelength-division multiplexing (WDM) systems, demonstrating its applicability across diverse transmission scenarios. In a single-channel experimental system operating at 64 Gbaud 16QAM over 2240 km standard single-mode fiber (SSMF), Task-Aligned Co-GRU achieves up to a 0.42 dB improvement in <span><math><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>-factor over chromatic dispersion compensation (CDC), while outperforming one-step-per-span digital backpropagation (DBP-1) with a 75.5% reduction in computational complexity. In an eight-channel WDM experimental system transmitting 64 Gbaud 16QAM signals over 1600 km SSMF, it surpasses 16-step-per-span DBP (DBP-16) by 0.07 dB, requiring only 2.1% of its computational cost. These results demonstrate that Task-Aligned Co-GRU achieves a favorable trade-off between performance and complexity, supporting its potential for real-time deployment in high-capacity coherent optical networks.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132490"},"PeriodicalIF":2.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159249","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":"Analysis and suppression of inter-axis optical crosstalk on threshold of multi-axis fiber optic gyroscopes","authors":"Hui Cao ,&nbsp;Qihang Duan ,&nbsp;Nianbao Shi ,&nbsp;Jintao Xu ,&nbsp;Shesheng Gao","doi":"10.1016/j.optcom.2025.132504","DOIUrl":"10.1016/j.optcom.2025.132504","url":null,"abstract":"<div><div>Multi-axis fiber optic gyroscopes (FOGs) commonly utilize a single superluminescent diode (SLD) light source to drive multiple optical paths, enabling compact design and reduced power consumption. However, internal backreflections within the shared SLD source can introduce inter-axis optical crosstalk, significantly degrading the accuracy of low rotation rate measurements. This paper investigates the mechanism of backreflection at the fiber end face within the SLD source and constructs a model of inter-axis optical backreflection crosstalk pathways. A mathematical relationship is derived between the optical backreflection crosstalk and the closed-loop feedback phase of each axis. To quantitatively characterize crosstalk, an open-loop excitation method is proposed to measure the optical backreflection crosstalk coefficients experimentally. A closed-loop control model is then used to simulate how varying crosstalk coefficients influence the system's threshold. To mitigate this impact, a static operating point flipping bias method is introduced. Experimental results demonstrate that this method reduces the threshold from 0.2°/h to less than 0.01°/h, thereby substantially improving the low rotation rate measurement accuracy of multi-axis FOGs.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132504"},"PeriodicalIF":2.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221535","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":"High-performance, spectrometer-free sensing of refractive index with a tunable, high-Q metasurface","authors":"Xiaojun Li ,&nbsp;Yiwen Tang ,&nbsp;Zenghui Chen ,&nbsp;Hengjun Chen ,&nbsp;Xin-lin Wang","doi":"10.1016/j.optcom.2025.132501","DOIUrl":"10.1016/j.optcom.2025.132501","url":null,"abstract":"<div><div>High-performance optical sensors often face a trade-off between achieving ultra-high sensitivity via high Q-factor resonances, like bound states in the continuum (BICs), and maintaining robustness against fabrication imperfections. Moreover, reliance on bulky, costly spectrometers hinders the development of practical, high-performance refractive index (RI) sensors. This work overcomes these limitations by introducing an electro-optically tunable lithium niobate metasurface platform featuring engineered Q-factor robustness and supporting spectrometer-free RI sensing. We developed a strategy based on weak-field perturbation of symmetry-protected BICs, producing quasi-BICs that maintain ultra-high Q-factors (2.8 × 10⁶) while exhibiting significantly improved resilience to structural variations. This high-Q resonance yields an exceptional figure of merit for RI sensing exceeding 2 × 10⁶. We proposed a novel spectrometer-free RI sensing scheme, facilitated by efficient electro-optic modulation in the metasurface, which converts RI changes into simple voltage readouts via compensation. This work presents an approach for creating high-performance, robust, actively tunable, compact, and cost-effective optical sensors through engineered electro-optic metasurfaces.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132501"},"PeriodicalIF":2.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159247","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":"Bidirectional transmission of 5G/5G NR/6G signals in a SMF-FSO-wireless/UWOC/FSO converged system","authors":"Stotaw Talbachew Hayle ,&nbsp;Ming-Chung Cheng ,&nbsp;Hai-Han Lu ,&nbsp;Wei-Zhi Jiang ,&nbsp;Chi-Hsiang Hsu ,&nbsp;Wei-Ting Huang ,&nbsp;Feng-Ti Chen ,&nbsp;Yen-Chen Chen ,&nbsp;Chun-Cheng Liang ,&nbsp;Jia-Hui Chou","doi":"10.1016/j.optcom.2025.132507","DOIUrl":"10.1016/j.optcom.2025.132507","url":null,"abstract":"<div><div>A bidirectional converged system integrating single-mode fiber (SMF), free-space optical (FSO), and various wireless/underwater optical communication (UWOC)/FSO links is demonstrated for seamless multiband transmission of fifth-generation (5G), 5G new radio (NR), and sixth-generation (6G) signals. Utilizing millimeter-wave, sub-terahertz (sub-THz), and terahertz (THz) bands, the architecture supports high-capacity, long-distance communication across terrestrial and underwater environments. Both 5G NR sub-THz feedback signal and a spatial light modulator are used to correct beam misalignment in UWOC links due to ocean disturbances. An FSO backup path is used in place of the 6G THz wireless link to support reliability. Based on the experimental results, the total downstream and upstream data rates are 70-Gb/s and 180-Gb/s, respectively, transmitted over 38-km of SMF, 1.58-km of FSO, and various wireless/UWOC/FSO links. The system attains bit-error rates below 3.8 × 10⁻³, error vector magnitudes below 12.5 %, and clear constellation patterns confirming system reliability for next-generation integrated air-land-underwater systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132507"},"PeriodicalIF":2.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158613","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":"A fabrication-aware inverse design method for thin-film lithium niobate photonic devices","authors":"Yiman Qiao ,&nbsp;Cheng Qiu ,&nbsp;Yongyi Chen ,&nbsp;Li Qin ,&nbsp;Lijun Wang","doi":"10.1016/j.optcom.2025.132506","DOIUrl":"10.1016/j.optcom.2025.132506","url":null,"abstract":"<div><div>Lithium niobate on insulator (LNOI) is a compelling platform for photonic integrated circuits, enabling compact devices with a unique combination of high-speed electro-optic modulation, high efficiency, and strong nonlinear optical effects. This makes it an ideal candidate for inverse-design-enabled devices. However, its anisotropic etching produces sloped sidewalls that degrade device performance, a critical challenge overlooked by conventional inverse design methodologies. We propose a fabrication-aware inverse design framework that directly integrates sidewall profile modeling into optimization. Using this method, we design a mode multiplexer/demultiplexer (MUX/DEMUX) achieving −26 dB extinction ratio and below 0.28 dB insertion loss over 100 nm bandwidth. The approach ensures robustness against fabrication variations, paving the way for practical high-performance inverse-designed LNOI devices.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132506"},"PeriodicalIF":2.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158612","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":"High-Q mid-infrared fano metasurface biosensor based on toroidal dipole resonance","authors":"Tongshun Wang ,&nbsp;HengLi Feng ,&nbsp;Ruochen Zhao ,&nbsp;Daqiang Cong ,&nbsp;Sibo Wang ,&nbsp;Yang Gao","doi":"10.1016/j.optcom.2025.132500","DOIUrl":"10.1016/j.optcom.2025.132500","url":null,"abstract":"<div><div>This article presents a metasurface biosensor exhibiting a Fano resonance with ultra-high quality factor (<em>Q</em>) up to 153,789. Field distribution and multipole decomposition reveal that the sharp Fano resonance originates from a toroidal dipole mode. The metasurface demonstrates polarization-independent response, enhancing operational robustness in practical biosensing scenarios. Numerical simulations are conducted to detect different types of amino acids, blood samples infected with <em>Mycobacterium tuberculosis</em>, and malaria-affected red blood cells (RBCs). The results show that the sensor can achieve maximum sensitivity of 4.084 μm/RIU and figure of merit (<em>FOM</em>) of 73,781. This research highlights the metasurface's great potential for label-free biosensing applications while providing a theoretical foundation for high-Q factor sensor design.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132500"},"PeriodicalIF":2.5,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119238","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 characteristics and multi-particle trapping of Gaussian beams double-modulated by sine-cosine power-exponent-phase vortices","authors":"Jian Yu ,&nbsp;Yuchuan Yang ,&nbsp;Shandong Tong ,&nbsp;Zhe Zhang ,&nbsp;Min Zhou ,&nbsp;Huihong Long ,&nbsp;Siying Li","doi":"10.1016/j.optcom.2025.132468","DOIUrl":"10.1016/j.optcom.2025.132468","url":null,"abstract":"<div><div>In this paper, we introduce a novel class of noncanonical optical vortices, termed sine-cosine power vortices (SCPVs), which linear combine sinusoidal and cosine power-exponent-phase vortices. By superimposing these engineered vortices onto conventional Gaussian beams, we conduct comprehensive theoretical and experimental investigations on the propagation dynamics of dual-phase-modulated beams. The effects of different beam parameters on the morphological transformations of beam intensity profile structure are explored systematically, and the self-healing capability of these structured beams is also revealed through rigorous analysis of the Poynting energy flux distribution and validated via dynamic reconstruction experiments under partial beam obstruction, demonstrating their resilience against perturbations during propagation. In addition, in the context of particle trapping, these specially modulated Gaussian beams can generate unique optical trap structures, enabling precise capture and control of multiple microparticles, which has been verified using holographic optical tweezers experiments. Our research work opens new avenues for the directional or structured optical self-assembly of multiple particles.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132468"},"PeriodicalIF":2.5,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119244","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":"Dynamic Fabry–Perot cavity length detection based on multi-layer wavelet decomposition transformation method","authors":"Weijin Wang,&nbsp;Weizhao Pang,&nbsp;Yuxuan Peng,&nbsp;Tai Yuan,&nbsp;Leizhen Lu,&nbsp;Xuefeng Mao","doi":"10.1016/j.optcom.2025.132485","DOIUrl":"10.1016/j.optcom.2025.132485","url":null,"abstract":"<div><div>In this paper, a scanning laser-based dynamic Fabry–Perot sensor detection scheme is proposed to demodulate the absolute cavity length based on the multilayer wavelet decomposition transform method, which employs two newly proposed threshold functions. The demodulation accuracy and stability of the wavelet transform method with four different threshold functions are compared. Under the laser scanning frequency of 15 kHz, the algorithm can eliminate Doppler effect and achieve a mean square error of 1.0008 × 10⁻⁶μm², a standard deviation of 0.0181um, and a wavelength resolution of 0.01pm, which is characterized by low cost and high stability.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132485"},"PeriodicalIF":2.5,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221534","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}