Optics Communications最新文献

{"title":"Dispersion-induced power fading mitigation in intermediate frequency-over-fiber transmission using phase–time block coding","authors":"Jinwoo Park,&nbsp;Joungmoon Lee,&nbsp;Sang-Kook Han","doi":"10.1016/j.optcom.2025.131789","DOIUrl":"10.1016/j.optcom.2025.131789","url":null,"abstract":"<div><div>In this paper, a novel phase–time block coding (PTBC) approach incorporating an optical in-phase/quadrature (IQ) modulator for dispersion-induced power fading mitigation is proposed in a broadband intermediate-frequency-over-fiber (IFoF) system. The multiband IFoF signal is modulated simultaneously into in-phase and quadrature components by the IQ modulator while ensuring orthogonality with the PTBC to mitigate the effect of dispersion-induced power fading. The feasibility of the proposed technique is demonstrated using a 20 GHz-bandwidth IFoF signal transmission simulation in the fading-affected band of a 20 km dispersive fiber. In addition, proof-of-concept experiments are conducted using a 9.5 GHz IFoF signal and a 50 km dispersive fiber.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131789"},"PeriodicalIF":2.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747289","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":"Wavelength multiplexed optical dynamic encryption","authors":"Pengteng Li ,&nbsp;Yuhang Xiao ,&nbsp;Wenxi Zhu ,&nbsp;Haoyang Yu ,&nbsp;Chao Lu ,&nbsp;Tianhua Feng ,&nbsp;Zhaohui Li","doi":"10.1016/j.optcom.2025.131821","DOIUrl":"10.1016/j.optcom.2025.131821","url":null,"abstract":"<div><div>Optical encryption has recently attracted intensive research attention to meet the rapidly growing demand for information security. Various methods, such as developing precise algorithms and modulating multiple degrees of freedom in the optical field by using metasurfaces, have been studied to enhance information capacity, efficiency, and security. However, these methods often require a powerful computer configuration and consume significant energy, or they may encounter challenges in manufacturing and dynamic modulation. Here, by employing the multiplexing principle, we propose and experimentally validate a wavelength multiplexed optical dynamic encryption scheme to facilitate information encryption channels and security. Specifically, information is flexibly and dynamically encrypted within the Fourier domain of optical images and multiplexed in a parallel way with different wavelengths. Importantly, information security is further bolstered by the decryption requirement of region separation for the ciphertext image according to different wavelengths. This work represents a step forward for the optical encryption platform and may advance the investigation of information encryption.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131821"},"PeriodicalIF":2.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760482","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":"Power scaling strategy for resonant second-harmonic generation in the visible regime","authors":"Manuel A. Medina,&nbsp;Sahar Alidousti,&nbsp;Callum McEwan,&nbsp;W. Andrew Clarkson","doi":"10.1016/j.optcom.2025.131776","DOIUrl":"10.1016/j.optcom.2025.131776","url":null,"abstract":"<div><div>In this paper, we describe external resonant second harmonic generation (SHG) of a multi-axial mode near-infrared (near-IR) source for scaling power in the visible (green) spectral band. By distributing the power across multiple frequencies, we significantly increased the output power obtainable from an ytterbium-doped fibre amplifier before reaching the onset of Stimulated Brillouin Scattering (SBS). Using a near-IR laser with <span><math><mo>∼</mo></math></span>9 longitudinal modes and an LBO crystal in a bow-tie cavity configuration, up to 15 W at a wavelength of 532 nm was achieved, with a conversion efficiency of 65% with respect to incident power. We discuss strategies for further up-scaling of output power, including increasing the number of axial modes and optimizing the amplifier configuration. Additionally, we highlight the advantages of our approach compared to previously reported high-power SHG systems, demonstrating its potential for future power scaling.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131776"},"PeriodicalIF":2.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental demonstration of modified constant modulus algorithm with polarization demultiplexing in Stokes space in optical coherent receiver","authors":"Bohang Huang,&nbsp;Xiangyong Dong,&nbsp;Fengjie Shi,&nbsp;Zhenming Yu,&nbsp;Kun Xu","doi":"10.1016/j.optcom.2025.131763","DOIUrl":"10.1016/j.optcom.2025.131763","url":null,"abstract":"<div><div>Constant modulus algorithm (CMA) is widely applied for polarization demultiplexing in coherent optical communication system. However, the singular value problem always plagues CMA. Modified CMA based on polarization demultiplexing in Stokes space (SS-PDM) was proposed to avoid the singular value problem in simulation. Here we firstly experimentally demonstrate the modified CMA based on SS-PDM in optical coherent receivers. We conduct experiment of 40-Gbit/s polarization multiplexing (PDM) QPSK to verify this method. The experimental results show that the singularity problem of CMA disappears for Polarization-dependent loss (PDL) of 2.7 dB and 4.8 dB by using the modified CMA and the convergence speed of the modified CMA increases significantly compared with that of conventional CMA.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131763"},"PeriodicalIF":2.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747390","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":"Exploring the influence of hydrostatic pressure on the structural and optoelectronic behavior of cubic A3PCl3 (A = Mg, Ca) perovskite for solar cell applications","authors":"Asadul Islam Shimul ,&nbsp;Md Mezbahul Haque ,&nbsp;Avijit Ghosh ,&nbsp;Nasser S. Awwad ,&nbsp;Hala A. Ibrahium","doi":"10.1016/j.optcom.2025.131807","DOIUrl":"10.1016/j.optcom.2025.131807","url":null,"abstract":"<div><div>This study utilizes first-principles simulations to investigate the optoelectronic properties of lead-free halide A₃PCl₃ (A = Mg, Ca) perovskites subjected to hydrostatic pressures from 0 to 60 GPa. As pressure increases, both the lattice parameter and cell volume decrease, indicating structural compression of the material. At ambient pressure, Mg₃PCl₃ and Ca₃PCl₃ demonstrate band gaps of 2.227 eV and 1.801 eV, respectively, indicating their potential for optoelectronic applications. The materials meet the Born stability criteria for mechanical stability throughout the examined pressure range, thereby confirming their stability under hydrostatic conditions. The perovskites demonstrate anisotropic elastic properties and possess high ductility, mechanical stability, and resistance to plastic deformation, all of which are improved under pressure. The mechanical analysis indicates that the materials maintain ductility and mechanical stability, exhibiting increased ductility with rising pressure. The optical properties were computed over the 0–35 eV energy spectrum under multiple pressures. Additionally, the optimized DFT values were employed in the proposed device construction FTO/ZnO/Mg₃PCl₃/Cu₂O/Ni and FTO/ZnO/Ca₃PCl₃/Cu₂O/Ni configurations attained optimal power conversion efficiencies (PCE) of around 15.29 % and 23.2 %, respectively, providing a safer, lead-free alternative to conventional Pb-based perovskites. Both materials exhibit remarkable ductility and compressive resistance, with bulk moduli substantially exceeding those of other perovskites such as CsPbX₃ and Sr₃AsCl₃. The amalgamation of mechanical stability, superior ductility, and pressure resilience renders Mg₃PCl₃ and Ca₃PCl₃ exemplary candidates for applications necessitating both high optoelectronic performance and durability under fluctuating pressure conditions.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131807"},"PeriodicalIF":2.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747290","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":"Polarization-independent dual-band optical modulation via strongly coupled optical Tamm states at 1D photonic crystal heterointerfaces","authors":"Lu Chen ,&nbsp;Wu Fei ,&nbsp;Zhichang Wang ,&nbsp;Chengchen Bi ,&nbsp;Xiaofan Deng ,&nbsp;Long Chen ,&nbsp;Haowei Ouyang ,&nbsp;Dongmei Li ,&nbsp;Youlong Yu ,&nbsp;Jigang Hu","doi":"10.1016/j.optcom.2025.131811","DOIUrl":"10.1016/j.optcom.2025.131811","url":null,"abstract":"<div><div>Here, we theoretically studied the strong longitudinal coupling of two optical Tamm states (OTS) in one-dimensional (1D) photonic crystal heterostructures embedded with lithium niobate (LN) layers in the near-infrared band. It is found that the two optical Tamm states can strongly interact with one another in the out-of-plane direction, enabling a large Rabi splitting (∼3.1 meV) in spectral response. The hybrid modes have an ultra-narrow linewidth of 0.85 nm with a Q factor up to 2.2 × 10³. The hybridization of two OTSs was investigated by calculating field profiles and Hopfield coefficients of hybrid modes. The simulation results show that the resonant frequencies of two OTSs can be flexibly controlled by changing the structural parameters or dynamically modulating the gate voltage on the LN layers to reach zero-detuning for strong coupling generation. Remarkably, we reveal that resonant frequencies of the hybrid modes are extremely sensitive to the gate voltage on LN films while immune to the polarization of normally incident light, enabling a dual-band electro-optic (EO) modulation with an ultra-high sensitivity (0.13 nm/V) and nearly perfect modulation depth (∼99 %). The polarization-independent, dual-band, highly efficient optical modulation offered by the hybrid modes in this etchless multilayer structure can find potential applications in multi-channel light detecting, multispectral nanolasing, tunable filtering, and optical modulation devices.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131811"},"PeriodicalIF":2.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746880","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":"Supercontinuum light generated in water with small and large scattering particles","authors":"Shah Faisal Bin Mazhar ,&nbsp;Robert Alfano","doi":"10.1016/j.optcom.2025.131795","DOIUrl":"10.1016/j.optcom.2025.131795","url":null,"abstract":"<div><div>White light generation for intense 90 fs laser pulses at 800 nm was experimentally investigated on the anti-Stokes side from water with small and large polystyrene scattering particles. The output spectra of the light propagation pattern inside the scattering water media and from conical angular pattern of the light on a screen shows salient features of the effects of small and large particles. This work shed light on propagation of light in free space communication, imaging in tissues and scattering media.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131795"},"PeriodicalIF":2.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747294","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":"Effect of spin–orbit coupling on the ionization of Xe atom by quantum-field scattering theory","authors":"Xianghe Ren ,&nbsp;Jingtao Zhang","doi":"10.1016/j.optcom.2025.131772","DOIUrl":"10.1016/j.optcom.2025.131772","url":null,"abstract":"<div><div>We present a theoretical investigation of spin–orbit coupling effects on the ionization of Xe atom in corotating two-color (CoRTC) and counter-rotating two-color (CRTC) circularly polarized laser fields. Through implementation of quantum-field scattering theory, we develop an ionization matrix element formalism that incorporates both spin–orbit interactions and fractional spherical harmonic functions, thereby extending beyond conventional frameworks employing integer-order spherical harmonics. By calculating ionization yields across various spin–orbit coupled states, we find that these yields are significantly influenced by the spin–orbit coupling. Specifically, for <span><math><mrow><mi>m</mi><mo>=</mo><mn>0</mn></mrow></math></span> the ionization yields are notably suppressed, especially in the polarization plane at <span><math><mrow><mi>θ</mi><mo>=</mo><mn>90</mn><mo>°</mo></mrow></math></span>. We explain these phenomena through a theoretical approach combining generalized phased Bessel functions with fractional spherical harmonic functions.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131772"},"PeriodicalIF":2.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760384","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-dimensional Orbital Angular Momentum Communication of Perfect Vortex Beam Based on Demultiplexing of Microlens Array with sector sub-aperture","authors":"Fan Wu ,&nbsp;Ao Tang ,&nbsp;Zhijie Pan,&nbsp;Feng Shen","doi":"10.1016/j.optcom.2025.131762","DOIUrl":"10.1016/j.optcom.2025.131762","url":null,"abstract":"<div><div>The Perfect Vortex Beam (PVB) exhibits a consistent ring radius across different Orbital Angular Momentum (OAM) modes, this unique characteristic endows the PVB has excellent application prospects in the free-space optical communication field, etc. In this paper, we experimentally demonstrate a high-dimensional OAM communication method using PVB for encoding, and demultiplexing via a microlens array with sector sub-aperture(MLA-S). At the transmitter, multiple PVB with different radii and modes are superimposed to achieve high-dimensional information encoding. At the receiver, an MLA-S is employed for decoding, which the circularly symmetric structure effectively matches the helical phase. This device can simultaneously measure multiple OAM modes at different spatial positions. And compared to using only the OAM modulation, this method can encode more information by utilizing fewer modes. Meanwhile, the OAM decoding device has high measurement accuracy, and a large measurement range without complex image processing. Therefore, this work has promising applications in high-capacity spatial optical communication and mode recognition.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131762"},"PeriodicalIF":2.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747288","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":"External cavity second-Stokes Raman laser based on potassium yttrium tungstate (KYW) crystal","authors":"Guorui Lv ,&nbsp;Lei Guo ,&nbsp;Haiping Xu ,&nbsp;Xian-An Dou ,&nbsp;Qing Ye ,&nbsp;Hui Kong ,&nbsp;Yaling Yang ,&nbsp;Jintian Bian ,&nbsp;Nanxiang Zhao ,&nbsp;Zefeng Wang ,&nbsp;Kejian Yang ,&nbsp;Jianjun Zhang","doi":"10.1016/j.optcom.2025.131806","DOIUrl":"10.1016/j.optcom.2025.131806","url":null,"abstract":"<div><div>We present an external-cavity potassium yttrium tungstate (KYW) second-Stokes Raman laser with strong pulse compression capability. A linearly polarized 1064 nm Nd:YAG laser is used as the pump source with a pulse width of 236 ns and a repetition frequency of 10 kHz. Under the maximum pump power of 22 W, the Stokes output power of 1.06 W is obtained at 1318 nm with a slope efficiency of 8.5 %, and the corresponding pulse width is reduced to 24 ns with a compression ratio of ∼10. And the generation process of second-Stokes pulse is simulated theoretically based on the steady-state stimulated Raman coupled wave theory. As far as we know, this is the first watt-level second-Stokes Raman laser based on KYW crystal. In addition, the cross-cascade mechanism of second-Stokes is studied among 905 cm⁻¹, 765 cm⁻¹ and 87 cm⁻¹ modes, which demonstrates the potential of KYW crystal in multi-wavelength Raman lasers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131806"},"PeriodicalIF":2.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747292","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}