Optical Fiber Technology最新文献_第9页

Generation of various bound solitons in a carbon nanotube-based bidirectional mode-locked all-fiber ring laser 碳纳米管双向锁模全光纤环形激光器中各种束缚孤子的产生

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-13 DOI: 10.1016/j.yofte.2025.104217

Yan Li, Ping Tang, Jin Zhang, Zixuan Guo, Feng Wu

{"title":"Generation of various bound solitons in a carbon nanotube-based bidirectional mode-locked all-fiber ring laser","authors":"Yan Li, Ping Tang, Jin Zhang, Zixuan Guo, Feng Wu","doi":"10.1016/j.yofte.2025.104217","DOIUrl":"10.1016/j.yofte.2025.104217","url":null,"abstract":"<div><div>Bound solitons, as an interesting physical phenomenon operating at multi-pulse mode, are intensively investigated in unidirectional mode-locked lasers, both theoretically and experimentally. However, they have rarely been observed in bidirectional lasers, especially the bound solitons with anti-phase and in-phase have not even reported. Here, we demonstrate a systematic experimental observation of two-soliton bound states with phase differences of 0 (in-phase), <span><math><mrow><mo>±</mo><mi>π</mi><mo>/</mo><mn>2</mn></mrow></math></span>, and <span><math><mi>π</mi></math></span> (anti-phase). The laser is passively mode-locked by a carbon nanotube saturable absorber, with the unsaturated loss, saturation optical intensity, and modulation depth of 40 MW/cm<sup>2</sup>, 52.3%, and 6.1%, respectively. Two synchronous single-soliton pulses in clockwise and counter-clockwise directions, with a repetition frequency of 63.92 MHz, were delivered simultaneously from the fiber laser. Besides, various two-soliton bound states with different pulse separations and phase differences were obtained when the pump power was up to 68 <!-->mW. Furthermore, not only the same, but also the different bound states were observed between the counter-propagation directions. The short- and long-term stability of the bound states were also investigated in laboratory environments. The results enrich the content of nonlinear dynamics of bound solitons and have potential applications in fiber optical communications.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"93 ","pages":"Article 104217"},"PeriodicalIF":2.6,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Damage state monitoring of buried pipeline based on distributed acoustic sensing technology 基于分布式声传感技术的埋地管道损伤状态监测

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-13 DOI: 10.1016/j.yofte.2025.104230

Xiaoke Gong , Jinghong Wu , Na Zheng , Zhuo Chen , Xiangyu Zhao , Lixiang Jia , Wenhao Shi , Mengfen Shen

{"title":"Damage state monitoring of buried pipeline based on distributed acoustic sensing technology","authors":"Xiaoke Gong , Jinghong Wu , Na Zheng , Zhuo Chen , Xiangyu Zhao , Lixiang Jia , Wenhao Shi , Mengfen Shen","doi":"10.1016/j.yofte.2025.104230","DOIUrl":"10.1016/j.yofte.2025.104230","url":null,"abstract":"<div><div>Buried water pipelines, as crucial urban infrastructure, play an essential role. However, the damage to the pipeline structure has emerged as a severe public safety hazard. Monitoring the state of the pipeline structure holds great significance for the normal operation of water pipelines. In this paper, a damage monitoring method for buried pipelines based on distributed acoustic sensing technology is proposed. Through a series of field experiments conducted on a pipeline, the feasibility of utilizing the attached fiber − optic cable to acquire vibration information has been demonstrated. The recorded vibration signals can indicate various damage statuses during the pipeline damage process, including rock/soil fall, pipeline seepage, and pipe wall failure. The results suggest that the fiber − optic cable accompanying the pipelines can be exploited as sensing resources to monitor damage risks to the pipelines, which presents advantages in the damage identification and location of buried pipelines. This research provides a valuable reference for the application of distributed acoustic sensing technology in the damage monitoring of urban buried water pipelines.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"93 ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband dual channel mode filter based on triple-core photonic crystal fiber 基于三芯光子晶体光纤的宽带双通道滤波器

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-13 DOI: 10.1016/j.yofte.2025.104232

Zhanqiang Hui , Zengxiang Qiu , Yue Zhao , Dongdong Han , Tiantian Li , Kelei Miao , Abdel-Hamid Soliman

{"title":"Broadband dual channel mode filter based on triple-core photonic crystal fiber","authors":"Zhanqiang Hui , Zengxiang Qiu , Yue Zhao , Dongdong Han , Tiantian Li , Kelei Miao , Abdel-Hamid Soliman","doi":"10.1016/j.yofte.2025.104232","DOIUrl":"10.1016/j.yofte.2025.104232","url":null,"abstract":"<div><div>A novel mode filter based on a triple-core photonic crystal fiber (PCF) with a large bandwidth was proposed. The device uses silica as the substrate material, and its main core can support three modes: LP<sub>01</sub>, LP<sub>11</sub>, and LP<sub>21</sub>. By coating gold film on the inner walls of the air holes in the cladding of the side cores, the coupled LP<sub>01</sub> and LP<sub>11</sub> modes from the main core experience significant attenuation when propagating in the side cores. This enables the mode filter to output only the LP<sub>21</sub> mode. The structure of the mode filter was optimized by using the eigenmode finite difference method and the eigenmode expansion method. The results indicate that when the input wavelength is 1.55 μm, the mode suppression ratios (MSRs) for the filtered LP<sub>01</sub> and LP<sub>11</sub> modes exceed 20 dB. Moreover, the mode filter operates in two working bands with bandwidths of 125 nm (1.5–1.625 μm) and 53 nm (1.766–1.819 μm), covering the S, C, and L bands. The total length of the device is only 46.5 mm. Especially, at 1550 nm, the insertion loss (IL) is as low as 0.024 dB, and the MSR is 19.84 dB. Owing to the advantages of wide bandwidth, low IL, high MSR, and compact structure, this mode filter will find great potential for applications in mode-division multiplexing fiber-optic communication/sensing, quantum information systems, and related fields.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"93 ","pages":"Article 104232"},"PeriodicalIF":2.6,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microfiber biosensor for detection of ultra-low concentration alpha-fetoprotein based on graphene oxide 基于氧化石墨烯的超低浓度甲胎蛋白检测微纤维生物传感器

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-13 DOI: 10.1016/j.yofte.2025.104229

Xi Deng , Yun Peng , Rong Long

{"title":"Microfiber biosensor for detection of ultra-low concentration alpha-fetoprotein based on graphene oxide","authors":"Xi Deng , Yun Peng , Rong Long","doi":"10.1016/j.yofte.2025.104229","DOIUrl":"10.1016/j.yofte.2025.104229","url":null,"abstract":"<div><div>Alpha-fetoprotein (AFP) is an important hepatocellular carcinoma (HCC) marker, however, its ultra-low concentration in the body of patient with early HCC makes it difficult to diagnose early HCC. In this paper, a microfiber biosensor on the basis of graphene oxide (GO) is proposed for the detection of ultra-low concentration AFP antigen. It is difficult to detect AFP antigen biomolecule solutions with ultra-low concentrations directly, because the variation in the concentration has a negligible impact on the refractive index (RI) of the entire solution. However, GO contains plenty of oxygen-containing groups and binding sites. Therefore, it will adsorb plenty of AFP antigen molecules, which will change the effective surround RI, and consequently, it makes the sensor achieve highly sensitive AFP antigen detection. The biosensor we proposed demonstrates high sensitivity of 1.11582 nm/lg (mol/L) in the linear range from 7 zg/mL to 7 pg/mL (R<sup>2</sup> = 0.99647). And the detection limit (LOD) of 78 zg/mL is ultra-low. The biosensor achieves detection of ultra-low concentration AFP antigen solution, which indicates exceptional potential prospects in early diagnosis of HCC.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"93 ","pages":"Article 104229"},"PeriodicalIF":2.6,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Fast recognition method for DVS perimeter security intrusion signals based on transfer learning 基于迁移学习的分布式交换机周边安全入侵信号快速识别方法

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-13 DOI: 10.1016/j.yofte.2025.104227

Yongxu Shen , Chang Wang , Zhihui Sun , Faxiang Zhang , Shaodong Jiang , Xu Liu , Fengxia Gao

{"title":"A Fast recognition method for DVS perimeter security intrusion signals based on transfer learning","authors":"Yongxu Shen , Chang Wang , Zhihui Sun , Faxiang Zhang , Shaodong Jiang , Xu Liu , Fengxia Gao","doi":"10.1016/j.yofte.2025.104227","DOIUrl":"10.1016/j.yofte.2025.104227","url":null,"abstract":"<div><div>In the perimeter security intrusion signal monitoring based on the Distributed Optical Fiber Vibration Sensing (DVS) system, the common approach for identifying intrusion signals in new scenarios is to collect large amounts of data and perform large-scale, long-term retraining of the initial network. However, this process consumes a significant amount of human resources and computational power each time. To address this issue, this paper proposes a transfer learning method. Using 53,000 sample data from six types of events collected in the laboratory, an SE-Densenet model was trained for 300 epochs on three NVIDIA A100 Tensor Core GPUs at the National Supercomputing Center in Jinan. Then, through the transfer learning approach, fine-tuning was performed on the new scenario by freezing 1/2 and 1/4 of the network layers and applying a feature extractor method. The fine-tuning training was carried out on a laptop equipped with 16 GB of memory and an Intel Core i7-12700 CPU. Experimental results show that, after 19.81 min of retraining using 600 data points from the new scenario, the feature extractor method achieved a test accuracy of 97.53 %. Compared to the other two methods, the training time was reduced by 20.87 min and 9.34 min, respectively, while the test accuracy increased by 13.76 % and 3.83 %. Compared to retraining with 6000 sufficient data, the transfer learning method improved training time by 6 to 13 times while achieving similar recognition accuracy. This study provides a new, convenient, and efficient method for perimeter security intrusion signal recognition, enabling quick adaptation to new scenarios and application in common engineering upper-level computer systems.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"93 ","pages":"Article 104227"},"PeriodicalIF":2.6,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of mean least squares on probabilistic shaping direct detection optical OFDM systems 概率整形直接检测光学OFDM系统的均值最小二乘研究

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-13 DOI: 10.1016/j.yofte.2025.104234

Jinhui Wang , Yupeng Li , Jiaxin Xue , Jiaheng Duan

{"title":"Investigation of mean least squares on probabilistic shaping direct detection optical OFDM systems","authors":"Jinhui Wang , Yupeng Li , Jiaxin Xue , Jiaheng Duan","doi":"10.1016/j.yofte.2025.104234","DOIUrl":"10.1016/j.yofte.2025.104234","url":null,"abstract":"<div><div>Probabilistic shaping (PS) techniques have been widely used in optical fiber communication systems due to their ability to significantly improve transmission efficiency and spectrum utilization. This paper generates probabilistic shaped 16QAM (PS-16QAM) signals based on the direct detection optical OFDM (DDO-OFDM) system using the block-bit shaping technique for constellation shaping of uniformly distributed 16QAM signals. In the process, considering the impact of inter carrier interference (ICI) and inter symbol interference (ISI) in OFDM signals on the signal quality at the receiver, comb pilot signals are inserted into PS-16QAM signals in the time domain and improve the accuracy of channel vector estimation by the mean least squares (LS) algorithm. We used optical simulation software VPItransmissionMaker10.1 to build the PS-DDO-OFDM system, and used MATLAB for digital signal processing (DSP). The simulation results after a 40-km standard single mode fiber show that the optical signal-to-noise ratio (OSNR) sensitivity of PS-16QAM with mean LS algorithm is improved by 5.6/8.2/10.2 dB, respectively, compared with uniform 16QAM with mean LS algorithm at entropy values of 3.78/3.31/2.82 bits/symbol, and in the PS-16QAM based system, the mean LS algorithm improves the OSNR sensitivity by 5.5/5.5/5.1 dB compared to the common LS algorithm for entropy values of 3.78/3.31/2.82 bits/symbol, respectively. In addition, the error vector magnitude (EVM) values at the receiver side and the convergence analysis of the constellation diagram further validate the significant advantages of the mean LS algorithm in PS-16QAM systems.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"93 ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Q-switched neodymium doped all-fiber laser with iron phthalocyanines saturable absorber 酞菁铁饱和吸收器调q掺钕全光纤激光器

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-11 DOI: 10.1016/j.yofte.2025.104235

Nurul Izzah S. Wadi , Suziana Omar , Zulzilawati Jusoh , Muhammad Imran M.A. Khudus , Aeriyn D. Ahmad , Sameer Salam

引用次数: 0

Optimized power coupling for enhanced wavelength switching in Brillouin-Raman fiber lasers 布里渊-拉曼光纤激光器中增强波长开关的优化功率耦合

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-10 DOI: 10.1016/j.yofte.2025.104225

Zhi Yong Yau , Yu Gang Shee , Eng Hock Lim , Mohd Adzir Mahdi

引用次数: 0

End-to-end geometric constellation shaping with artificial parameter setting for long-haul coherent optical transmission 远距离相干光传输端到端几何星座人工参数设置

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-09 DOI: 10.1016/j.yofte.2025.104218

Jiayu Zheng , Tianhong Zhang , Xiang Cai , Xiansong Fang , Fan Zhang

引用次数: 0

Stability analysis of mode-locked pulses generated by nonlinear polarization rotation effect using nonlinear optical fiber Jones matrix 利用非线性光纤琼斯矩阵分析非线性偏振旋转效应产生的锁模脉冲的稳定性

IF 2.6 3区计算机科学

Optical Fiber Technology Pub Date : 2025-04-08 DOI: 10.1016/j.yofte.2025.104216

Minseok Kim , Dowon Kim , Hyun Su Kim

引用次数: 0