Optics Communications最新文献_第10页

Large circular dichroic long-wave infrared polarization photodetector based on rotationally operated chiral metasurfaces

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-05 DOI: 10.1016/j.optcom.2025.131680

Bo Cheng , Li Liu , Yuxiao Zou , Guofeng Song , Shujie Li , Kunpeng Zhai

{"title":"Large circular dichroic long-wave infrared polarization photodetector based on rotationally operated chiral metasurfaces","authors":"Bo Cheng , Li Liu , Yuxiao Zou , Guofeng Song , Shujie Li , Kunpeng Zhai","doi":"10.1016/j.optcom.2025.131680","DOIUrl":"10.1016/j.optcom.2025.131680","url":null,"abstract":"<div><div>A long-wave HgCdTe (MCT) detector, akin to the human eye, cannot inherently discern light polarization. Therefore, a miniature polarization filter needs to be placed in front of the image sensor, which defines the intensity of the different polarization modes. However, the circular dichroism and circular polarization extinction ratios of these miniature polarization detectors are typically not very high in the mid and long wavelength bands, which severely limits the polarization resolving power of the pixels. We numerically simulate a circularly dichroic metasurface based on the silicon material, gradually break the spatial symmetry through displacement and rotation operations of the unit cell of metasurface, and analyze the cause of the large chiral symmetry based on the FP mode and near-field map of the electric field intensity. The resulting high-quality chiral metasurface-based photodetector achieves remarkable circular dichroism and circularly polarized extinction ratios of 0.97 and 20 dB, respectively, promising advancements in microdetector technology from intensity to polarization detection. Last but not least, the use of silicon materials aligns with established silicon-based processes, reducing theoretical process preparation challenges.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131680"},"PeriodicalIF":2.2,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610927","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}

引用次数: 0

High-sensitivity and multiple fingerprint detection at an exception point in electromagnetic induced transparent metasurfaces

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-05 DOI: 10.1016/j.optcom.2025.131699

Pingsheng Zhang, Menghan Xiong, Xingyan Zhao, Yang Qiu, Shaonan Zheng, Yuan Dong, Qize Zhong, Ting Hu

{"title":"High-sensitivity and multiple fingerprint detection at an exception point in electromagnetic induced transparent metasurfaces","authors":"Pingsheng Zhang, Menghan Xiong, Xingyan Zhao, Yang Qiu, Shaonan Zheng, Yuan Dong, Qize Zhong, Ting Hu","doi":"10.1016/j.optcom.2025.131699","DOIUrl":"10.1016/j.optcom.2025.131699","url":null,"abstract":"<div><div>Electromagnetic induced transparent (EIT) metasurfaces have garnered significant interest in the terahertz (THz) fingerprint sensing field, owing to their capability to enhance light-matter interactions. However, previous EIT metasurfaces typically exhibit unsatisfactory sensitivity and a narrower detection bandwidth, limiting their capability in broadband fingerprint detection. Here, an EIT metasurface characterized by exceptional point and tunable properties is presented. Based on the synchronous gate voltage tuning, this EIT metasurface demonstrates tunability in the range of 2.6–4.1 THz, which facilitates the acquisition of multiple fingerprint from analytes. And through theoretical calculations, the exceptional point was accurately identified, enabling the EIT metasurface to achieve a sensitivity of 1.22 THz<em>/RIU</em>. Most importantly, the proposed EIT metasurface identifies multiple THz fingerprints of melamine, showcasing a excellent capability for fingerprint sensing. The proposed EIT metasurface integrates high sensitivity and tunability, showcasing significant potential for applications in broadband THz fingerprint sensing.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131699"},"PeriodicalIF":2.2,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562246","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}

引用次数: 0

Coherent fading suppression method in the COTDR system based on multi-band filtering

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-04 DOI: 10.1016/j.optcom.2025.131696

Xiang Sui , Ying Shang , Sheng Huang , Wenan Zhao , Xiaohan Qiao , Guangqiang Liu , Chunmei Yao , Shouling Liu , Na Wan , Xianggui Kong , Hong Zhao , Fengming Mou , Zhengying Li , Weitao Wang , Chen Wang , Gangding Peng

{"title":"Coherent fading suppression method in the COTDR system based on multi-band filtering","authors":"Xiang Sui , Ying Shang , Sheng Huang , Wenan Zhao , Xiaohan Qiao , Guangqiang Liu , Chunmei Yao , Shouling Liu , Na Wan , Xianggui Kong , Hong Zhao , Fengming Mou , Zhengying Li , Weitao Wang , Chen Wang , Gangding Peng","doi":"10.1016/j.optcom.2025.131696","DOIUrl":"10.1016/j.optcom.2025.131696","url":null,"abstract":"<div><div>In this paper, a multi-band filtering method is proposed and demonstrated to suppress the coherent fading in the coherent optical time-domain reflectometry (COTDR) system. The local light and the Rayleigh backscattered (RBS) light beat together and create the intermediate frequency signal <em>u</em><sub><em>BPD</em></sub>(<em>t</em>). Effective bandwidth <em>BW</em><sub><em>c</em></sub> can be obtained by analysing the frequency composition of <em>u</em><sub><em>BPD</em></sub>(<em>t</em>). Applying band-pass filters with different widths no less than <em>BW</em><sub><em>c</em></sub>, signals with varying amplitude distributions can be obtained. The coherent fading can be eliminated by fusing signals with amplitude evaluation method. The experimental results show that the standard deviation of the demodulated phase is reduced from 0.039 rad to 0.008 rad. Additionally, the signal-to-noise ratio (SNR) of the demodulated signal is 40 dB. The results demonstrated the high reliability of this method.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131696"},"PeriodicalIF":2.2,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552036","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}

引用次数: 0

Deep learning based channel equalization method for wireless UV MIMO scattering turbulence channel

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-04 DOI: 10.1016/j.optcom.2025.131697

T.A.I.F.E.I. ZHAO , Y.U.Q.I. CHEN , Y.U.X.I.N. SUN , feixiang pan

{"title":"Deep learning based channel equalization method for wireless UV MIMO scattering turbulence channel","authors":"T.A.I.F.E.I. ZHAO , Y.U.Q.I. CHEN , Y.U.X.I.N. SUN , feixiang pan","doi":"10.1016/j.optcom.2025.131697","DOIUrl":"10.1016/j.optcom.2025.131697","url":null,"abstract":"<div><div>Aiming at the problems of traditional equalization methods for ultraviolet (UV) multiple-input multiple-output (MIMO) channels in turbulent environments, such as their strong dependence on a priori knowledge of the channel and the low accuracy in coping with the modeling of complex nonlinear channels, this paper proposes a deep-learning-based equalization method for wireless UV-scattering MIMO channels. The method transforms the MIMO signal into a two-dimensional time series, takes the bidirectional long short-term memory (BiLSTM) with bidirectional sequence feature extraction capability as the core, and supplements it with deep neural network for nonlinear modeling to construct a deep learning network model suitable for UV MIMO channel equalization, so as to realize the accurate recovery of the original MIMO signal. Simulation results show that the scheme exhibits stronger BER and MSE performance compared with the least mean square(LMS) algorithm, recursive least squares(LMS) algorithm, and the equalization scheme based on multilayer long and short-term memory(multi-LSTM). At SNR of 9 dB, the scheme reduces the BER by about 67.9%, compared with the equalization scheme based on multi-LSTM, and has stable equalization effects in turbulence environments with different intensities.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131697"},"PeriodicalIF":2.2,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562271","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}

引用次数: 0

Adaptive multi-task convolutional neural network for optical performance monitoring

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-04 DOI: 10.1016/j.optcom.2025.131702

Qinghui Zeng , Yibu Kong , Peng Zhou , Ye Lu

{"title":"Adaptive multi-task convolutional neural network for optical performance monitoring","authors":"Qinghui Zeng , Yibu Kong , Peng Zhou , Ye Lu","doi":"10.1016/j.optcom.2025.131702","DOIUrl":"10.1016/j.optcom.2025.131702","url":null,"abstract":"<div><div>In order to enhance the study of optical communication, we collaboratively monitor modulation format identification (MFI) and optical signal-to-noise ratio (OSNR) estimation using few-shot learning (FSL) and transfer learning techniques. The constellation diagrams were input into the network, with MFI and OSNR classification treated as joint modulation tasks. Utilizing a 16-way-8-shot dataset configuration, the adaptive few-shot transfer learning network (AFTLN) algorithm achieved outstanding performance, attaining 100% accuracy in MFI and 97.29% accuracy in OSNR classification. Ablation studies were conducted on adaptive few-shot meta-learning network (AMCN), adaptive multi-task learning (AMTL), adaptive direct detection network (ADTN), and AFTLN. Notably, only the AFTLN method achieved 100% accuracy in MFI, while its OSNR classification accuracy was approximately 15% higher than that of AMTL. An analysis of the confusion matrix revealed that OSNR classification errors were primarily concentrated around 25 dB for 64QAM and 29 dB for 128QAM. The adaptive weight variation curve was also analyzed, indicating that after approximately 750 epochs, the model primarily concentrated on the first task of MFI. Subsequently, a dataset from optical fibers collected over a distance of 400 km was assembled to validate the feasibility of the proposed algorithms. The classification accuracy for MFI remained at 100%, while the OSNR estimation accuracy was 95.21%, reflecting only a roughly 2% decrease. This demonstrates that the algorithm exhibits strong robustness and is effective in diagnosing optical performance.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131702"},"PeriodicalIF":2.2,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592392","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}

引用次数: 0

Research on parallel AES encryption algorithm based on a ternary optical computer

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-04 DOI: 10.1016/j.optcom.2025.131660

Kai Song , Shuzhe Liu , Hejie Wang , Sheng Yang , Liping Yan , Sulan Zhang

{"title":"Research on parallel AES encryption algorithm based on a ternary optical computer","authors":"Kai Song , Shuzhe Liu , Hejie Wang , Sheng Yang , Liping Yan , Sulan Zhang","doi":"10.1016/j.optcom.2025.131660","DOIUrl":"10.1016/j.optcom.2025.131660","url":null,"abstract":"<div><div>The Advanced Encryption Standard (AES) encryption algorithm has never been broken since its introduction, and its security has been widely recognized and adopted widely by numerous countries and organizations. However, the algorithm requires dozens of iterations and each iteration involves a large number of computations, so there are problems such as low encryption efficiency and high computational costs. Aiming at these problems, this paper combines the characteristics of ternary optical computer (TOC), such as many data bits, parallel computation, three-valued encoding, to study and propose a parallel AES encryption scheme based on TOC. This scheme leverages the parallel advantages of TOC to improve the block-by-block encryption mode in the AES encryption algorithm. By employing a parallel computing strategy, it effectively reduces the execution time of the algorithm and significantly enhances encryption efficiency. In addition, this paper introduces three-valued operation logic on the basis of binary Exclusive OR(XOR) operation and constructs a set of three-valued XOR (T-XOR) standards to further improve the operation efficiency of AES encryption algorithm on TOC. Through the in-depth analysis of the algorithm resource consumption and time efficiency, and combined with the experimental verification, it can be concluded that the parallel AES encryption algorithm based on TOC has better computing efficiency and time effectiveness, which demonstrates the advantages of TOC in dealing with large-scale computing tasks.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131660"},"PeriodicalIF":2.2,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562247","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}

引用次数: 0

Ring-shaped multi-filament array formation in fused silica using center-blocked femtosecond laser pulses

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-03 DOI: 10.1016/j.optcom.2025.131691

Ting Zhang , Dongwei Li , Zhongzheng Zhang , Tao Wei , Zuoqiang Hao , Lanzhi Zhang

引用次数: 0

Underwater moving targets imaging method under non-uniform active illumination based on single-polarization image

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-03 DOI: 10.1016/j.optcom.2025.131695

Bocheng Lu , Nana Yu , Xunuo Ma , Xiaoyu Hui , Bing Ren , Xiaolei Wang , Sixing Xi

{"title":"Underwater moving targets imaging method under non-uniform active illumination based on single-polarization image","authors":"Bocheng Lu , Nana Yu , Xunuo Ma , Xiaoyu Hui , Bing Ren , Xiaolei Wang , Sixing Xi","doi":"10.1016/j.optcom.2025.131695","DOIUrl":"10.1016/j.optcom.2025.131695","url":null,"abstract":"<div><div>Active polarization imaging technology can effectively recover target information in scattering media. However, traditional methods for recovering moving targets often require multiple polarization images with consistent imaging positions, which has high requirements for the number and accuracy of detection equipment, increasing the time and cost of experiments. Additionally, non-uniform illumination from active light sources may further degrade underwater imaging quality. To address these issues, this study propose a single-polarization imaging method for underwater moving targets under active non-uniform illumination, we analyze backscattered intensity at various image positions and correlate it with the backscattered light distributions estimated through low-pass filtering, achieving an accurate global estimation of backscattered light. Subsequently, we improve the dynamic descattering model and introduce single-polarization imaging theory to enhance the stability of recovering moving targets by reducing polarization imaging inputs. Theoretical and experimental findings demonstrate that this method enhances imaging efficiency while achieving clear recovery of moving targets across various turbidity levels, effectively resolving uneven brightness throughout the image. Compared to other dynamic polarization imaging methods, using a single input offers greater practicality for dynamic descattering. The recovery video results of the moving target further demonstrate the effectiveness of this method in dynamic descattering of highly polarized objects.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131695"},"PeriodicalIF":2.2,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580720","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}

引用次数: 0

Enhancing long-distance optical link performance in MDM systems with multi-stage amplification and systematic design

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-01 DOI: 10.1016/j.optcom.2025.131687

Wenxuan Xu , Li Pei , Jianshuai Wang , Zhouyi Hu , Jingjing Zheng , Bing Bai

{"title":"Enhancing long-distance optical link performance in MDM systems with multi-stage amplification and systematic design","authors":"Wenxuan Xu , Li Pei , Jianshuai Wang , Zhouyi Hu , Jingjing Zheng , Bing Bai","doi":"10.1016/j.optcom.2025.131687","DOIUrl":"10.1016/j.optcom.2025.131687","url":null,"abstract":"<div><div>Few-mode erbium-doped fiber amplifiers (EDFAs) are crucial for long-distance transmission and modal power management. Current research primarily focuses on gain equalization within individual amplifiers. However, the gain of the amplifier is closely related to the input power. Variations in modal loss result in power disparities among different signal modes, causing gain instability and adversely impacting the system's overall performance. In multi-stage links, even a single amplifier with minimal gain discrepancy might create unequal amplification in the subsequent stage due to difference modal losses. After cascading multiple amplifiers, the imbalance will become even more severe. We have designed a target loss compensation erbium-doped fiber for multi-stage amplification. By considering both gain differences and fiber losses, we manipulate the doping structure to intentionally introduce differential modal gain to compensate for various modal losses. With a power disparity threshold set at 2 dB, the tolerance of cascaded inline amplifiers has been enlarged from 2 to 15, significantly extending the permissible relay distance from 250 km to 2000 km. The method no longer focuses solely on the performance of individual amplifiers but examines the power management of the entire link. The results clearly demonstrate the effectiveness of the loss compensation strategy. It provides a robust and practical method for mode power management without increasing the complexity.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131687"},"PeriodicalIF":2.2,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562234","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}

引用次数: 0

Research on electro-optical chaotic communication based on optical feedback mutual injection

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-03-01 DOI: 10.1016/j.optcom.2025.131686

Ke-Yuan Mo , Yu-Gang Huang , Zhao-Yun Li , Zhi-Yong Tao , Ya-Xian Fan

{"title":"Research on electro-optical chaotic communication based on optical feedback mutual injection","authors":"Ke-Yuan Mo , Yu-Gang Huang , Zhao-Yun Li , Zhi-Yong Tao , Ya-Xian Fan","doi":"10.1016/j.optcom.2025.131686","DOIUrl":"10.1016/j.optcom.2025.131686","url":null,"abstract":"<div><div>In this paper, an electro-optical chaotic communication scheme based on optical feedback inter-injection is proposed, which employs two inter-injection structures consisting of intensity-modulated and phase-modulated feedback branches and introduces optical feedback at the intensity-modulated end to realize a chaotic signal output with high complexity. Simulation results show that when the feedback gain coefficient is 0.6, the alignment entropy of the system reaches more than 0.9, which possesses optical chaotic signal output characteristics with high complexity, and when the feedback gain coefficient is lower than 0.1, the output time series starts bifurcation behavior, which does not require very large feedback gain coefficients under the condition of which the system time-delay characteristics can be hidden. At the same time, the scheme has less influence on the synchronization by the feedback gain coefficient mismatch and higher sensitivity to the time delay mismatch parameter, which indicates that the scheme can enhance the robustness of the system while improving the high security of the system when the time delay is used as the key.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131686"},"PeriodicalIF":2.2,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562240","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}

引用次数: 0