Optical Fiber Technology最新文献

{"title":"Inverse design of figure eight fiber laser by artificial neural network","authors":"Mahdi Kasmi ,&nbsp;Abdullah S. Karar ,&nbsp;Ahmad Atieh ,&nbsp;Kaboko Jean-Jacques Monga ,&nbsp;Ehsan Adibnia ,&nbsp;Hafedh Mahmoud Zayani ,&nbsp;Mohamed Salhi ,&nbsp;Alexander Perepelov ,&nbsp;Faouzi Bahloul","doi":"10.1016/j.yofte.2025.104290","DOIUrl":"10.1016/j.yofte.2025.104290","url":null,"abstract":"<div><div>Fiber lasers have become indispensable tools in modern photonics, offering unparalleled efficiency, stability, and versatility. Among them, the figure-eight fiber laser (F8FL) has gained prominence for its ability to generate ultra-short pulses with high peak power, making it highly suitable for applications in ultrafast spectroscopy, nonlinear microscopy, and optical frequency comb generation. However, designing and optimizing F8FLs remains a significant challenge due to the intricate interplay of nonlinear effects, dispersion management, and gain dynamics. Traditional design approaches rely on numerical simulations and iterative experimental tuning, which are computationally expensive and often yield suboptimal results. To address these challenges, we introduce a machine learning-based inverse design framework for optimizing F8FL parameters. Using a dataset generated from numerical simulations, an artificial neural network (ANN) is trained to establish a direct mapping between pulse characteristics and the key amplifier parameters, including small-signal gain and saturation energy. This approach enables rapid and accurate prediction of laser settings required to achieve a target pulse profile, significantly reducing the computational burden compared to conventional numerical methods. Our results demonstrate that the trained ANN model achieves excellent agreement with numerical simulations, effectively predicting the optimal parameters for producing high-energy rectangular pulses in the dissipative soliton resonance (DSR) regime. To validate the effectiveness of the predicted parameters, the ANN outputs were independently verified using OptiSystem simulations, confirming strong agreement with the desired pulse profiles. This study highlights the potential of machine learning in photonics, paving the way for the development of self-optimizing, adaptive laser systems with enhanced precision and efficiency. The proposed methodology can be extended to other nonlinear optical systems, offering a powerful tool for accelerating the design and optimization of advanced fiber lasers.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104290"},"PeriodicalIF":2.6,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291293","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}

{"title":"Photoelectric frequency multiplication method","authors":"Xinyue Zhu ,&nbsp;Ying Lin ,&nbsp;Wei Ye ,&nbsp;Jian Chen ,&nbsp;Kejiang Zhou","doi":"10.1016/j.yofte.2025.104286","DOIUrl":"10.1016/j.yofte.2025.104286","url":null,"abstract":"<div><div>A novel method of frequency multiplication, photoelectric frequency multiplication method, is proposed. This approach utilizes a resonant cavity of circular structure, relying on optical heterodyne principles for generating harmonic signals. To ensure stability of the phase shift between the laser beams, this method employs the structure of a ring fiber laser, modulating and heterodyning the laser beams generate by the same ring fiber laser. The proposed technique is capable of generating signals with multiplied frequency. Compared to other methods, this method produces signals with low phase noise and tunable frequencies, supports generation of signals with multiple frequency multiplication factors, and allows for high multiplication factor. Experiments have been conducted and the result demonstrated the feasibility of the method.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104286"},"PeriodicalIF":2.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270289","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}

{"title":"Human intrusion detection with distributed fiber optic data based on Squeeze-Excitation and hierarchical connection enhancement network","authors":"Yewen Huang,&nbsp;Xiaoyan Huang,&nbsp;Dongping Liu,&nbsp;Mianjie Li,&nbsp;Chun Shan","doi":"10.1016/j.yofte.2025.104297","DOIUrl":"10.1016/j.yofte.2025.104297","url":null,"abstract":"<div><div>Intrusion event detection technology plays an important role in home security, however, traditional intrusion detection methods have problems such as having a blind field of vision and not being able to make good use of distributed spatial information, which affects the accuracy of detection. This paper suggests a method for tackling this issue through employing a distributed fiber optic acoustic sensing technique, which makes full use of distributed spatial information to identify important features in fiber optic data. Then, on this basis, a Squeeze-Excitation and Hierarchical Connection Enhancement Network is proposed, whose key idea is to utilize different branches in the network to deal with feature maps of different resolutions or scales, to enhance the important features, and attenuate the unimportant ones, to make the features more directional and achieve higher accuracy. The method’s efficacy is ultimately assessed through analysis of intrusion events in the gathered fiber optic dataset, which achieves an intrusion detection accuracy of 99.2%.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104297"},"PeriodicalIF":2.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270290","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}

{"title":"Self-Q-switched and mode-locked erbium-ytterbium co-doped fiber laser","authors":"Varsha,&nbsp;Gautam Das","doi":"10.1016/j.yofte.2025.104308","DOIUrl":"10.1016/j.yofte.2025.104308","url":null,"abstract":"<div><div>We demonstrated a self-Q-switched mode-locked erbium-ytterbium co-doped fiber laser at 1570 nm. The repetition rate of Q-switched pulses increased from 3.25 kHz to 24.41 kHz, whereas pulse width reduced from 28.8 µs to 4.61 µs. Self-mode-locked pulses appeared inside Q-switched pulses just above the threshold and transitioned into mode-locked pulses beyond a pump power of 695 mW. The average output power, minimum pulse duration, and repetition rate of the mode-locked pulses were 160 mW, 340 ps, and 6.57 MHz, respectively, at a pump power of 2.4 W. Self Q-switched pulses were obtained at low pump power ranging from 205 mW to 694 mW. At high pump power, the Q-switched mode-locked pulses were switched entirely to a mode-locked regime. They stayed up to the maximum available pump power of 2.4 W. We presented the characteristics of the mode-locked laser and discussed their origin.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104308"},"PeriodicalIF":2.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279723","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}

{"title":"Prediction of freeze-thaw damage of asphalt concrete based on distributed fiber optic sensors and KAN-Transformer fusion model","authors":"Xuebing Zhang ,&nbsp;Jia Wang ,&nbsp;Luoqing Liu ,&nbsp;Jun Cao ,&nbsp;Yang Quan ,&nbsp;Xiaonan Xie ,&nbsp;Ping Xiang","doi":"10.1016/j.yofte.2025.104304","DOIUrl":"10.1016/j.yofte.2025.104304","url":null,"abstract":"<div><div>Asphalt mixtures are widely used in road construction but are vulnerable to damage caused by freeze–thaw cycles. This study introduces a novel approach to real-time monitoring using distributed fiber optic sensing (DFOS) technology and proposes an innovative deep learning fusion network architecture combining Kolmogorov-Arnold Network (KAN) and Transformer models. Real-time monitoring of asphalt beams during freeze–thaw cycles is achieved through DFOS, which collects data on strain, temperature, and other critical physical parameters. The KAN-Transformer model, along with Transformer-based time series models, is employed for data processing and feature extraction to detect and predict minor changes in material properties during freeze–thaw cycles. The results demonstrate that the KAN-Transformer model outperforms the traditional Transformer model, which suffers from limited parallel processing capability and sensitivity to hyperparameter tuning, leading to improved accuracy in predicting freeze–thaw damage evolution. This study not only validates the superior damage prediction accuracy of the KAN-Transformer model but also offers an efficient method for field applications in asphalt concrete damage prediction.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104304"},"PeriodicalIF":2.6,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262781","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}

{"title":"Influence of polishing depth on the refractive index response of fiber Bragg gratings inscribed in D-shape fibers","authors":"Denys de S. Scheiner ,&nbsp;Nathalia de C. Prediger ,&nbsp;Thales H.C. de Barros ,&nbsp;Henrique P. Alves ,&nbsp;Joaquim F. Martins-Filho ,&nbsp;Ricardo C. Kamikawachi","doi":"10.1016/j.yofte.2025.104283","DOIUrl":"10.1016/j.yofte.2025.104283","url":null,"abstract":"<div><div>This paper presents a study on the influence of polishing depth on the sensitivity and signal attenuation of D-shaped fiber Bragg gratings. The evaluated depths go beyond the cladding-core interface, typically not presented in the literature. The polishing depths of 1<!--> <!-->µm, 2<!--> <!-->µm, 3<!--> <!-->µm, 4<!--> <!-->µm, and 5<!--> <!-->µm from the core boundary are numerically analyzed using COMSOL Multiphysics. Experimental results are presented to corroborate the simulation results. The results show that increasing the polishing depth increases the power attenuation in the core, as expected, but on the other hand, increases the sensitivity to the refractive index, with values of 45.3<!--> <!-->nm/RIU and 138.9<!--> <!-->nm/RIU being obtained for depths of 2.5<!--> <!-->µm and 5.2<!--> <!-->µm. The observed experimental results are in good agreement with the simulation.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104283"},"PeriodicalIF":2.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240054","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}

{"title":"Systematic review of fiber-optic distributed acoustic sensing: advancements, applications, and challenges","authors":"Arni Munira Markom ,&nbsp;Suhairi Saharudin ,&nbsp;Mohd Hafizulfika Hisham","doi":"10.1016/j.yofte.2025.104293","DOIUrl":"10.1016/j.yofte.2025.104293","url":null,"abstract":"<div><div>Distributed Acoustic Sensing (DAS) is an advanced optical fiber technique that uses Rayleigh backscattering to offer real-time monitoring and data collection across a wide range of applications. Despite tremendous progress, no comprehensive review has summarized recent advancements, applications, and challenges with DAS systems across multiple fields. This study aims to bridge this gap by systematically reviewing the most recent research and addressing four essential questions: significant applications, advancements in technology, critical challenges, and the growth of signal processing approaches in DAS. This review uses a systematic approach of identification, screening, eligibility and data abstraction to group findings into six important themes: civil engineering and structural health monitoring, environmental and oceanographic applications, oil and gas industry applications, seismic and geophysical monitoring, telecommunications and infrastructure security, and signal processing and advanced sensing techniques. Our findings indicate that DAS has notably enhanced applications including structural anomaly detection, environmental monitoring, pipeline surveillance, seismic analysis, and telecommunications security. The precision, scalability, and versatility of DAS have been further enhanced by developments in machine learning, noise reduction methods, and hybrid sensing models. This analysis provides practical insights and future research objectives by tackling issues like noise interference and deployment complexity, establishing DAS as a game-changing instrument for transdisciplinary monitoring and real-time data collecting across a range of industries.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104293"},"PeriodicalIF":2.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239365","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}

{"title":"High-sensitivity strain sensor with air microbubble based on the Vernier effect","authors":"Jingwei Lv ,&nbsp;Weijie Kong ,&nbsp;Jianxin Wang ,&nbsp;Wei Li ,&nbsp;Renfeng Li ,&nbsp;Liangliang Li ,&nbsp;Qiang Liu ,&nbsp;Jianing Shi ,&nbsp;Wei Liu ,&nbsp;Pan Meng ,&nbsp;Xinrui Guo ,&nbsp;Paul K. Chu ,&nbsp;Chao Liu","doi":"10.1016/j.yofte.2025.104295","DOIUrl":"10.1016/j.yofte.2025.104295","url":null,"abstract":"<div><div>A highly sensitive optical fiber strain sensor with simple structure, easy preparation and temperature insensitivity is proposed. It consists of a parallel Fabry-Pérot Interferometer (FPI) based on the Vernier Effect (VE). The sensing cavity (FPI_S) is formed by two single-mode fibers (SMFs) by fusion splicer arc discharge, and the reference cavity (FPI_R) consists of two SMFs inserted into a hollow capillary tube（HCT）. The sensor has a high strain sensitivity of −42.04 pm/µε and an ultra-low temperature cross-sensitivity of 0.022 µε/°C, which reduces the measurement errors caused by temperature variations. At the same time, stable experimental measurements show that the interference fringes change by less than 20 pm. This sensor combines high strain sensitivity, ultra-low temperature cross-sensitivity, and stable performance for precise strain measurement applications.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104295"},"PeriodicalIF":2.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239364","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}

{"title":"First real-time ultra-high-speed field trial using commercial 130-Gbaud PCS-16QAM 800 Gb/s OTN transceivers over deployed multi-core fiber cable","authors":"Jian Cui ,&nbsp;Yu Deng ,&nbsp;Zhuo Liu ,&nbsp;Bin Hao ,&nbsp;Chao Wu ,&nbsp;Leimin Zhang ,&nbsp;Ting Zhang ,&nbsp;Yuxiao Wang ,&nbsp;Bin Wu ,&nbsp;Chengxing Zhang ,&nbsp;Jiabin Wang ,&nbsp;Baoluo Yan ,&nbsp;Li Zhang ,&nbsp;Yong Chen ,&nbsp;Xuechuan Chen ,&nbsp;Hu Shi ,&nbsp;Lei Shen ,&nbsp;Lei Zhang ,&nbsp;Jie Luo ,&nbsp;Yan Sun ,&nbsp;Ninglun Gu","doi":"10.1016/j.yofte.2025.104292","DOIUrl":"10.1016/j.yofte.2025.104292","url":null,"abstract":"<div><div>Space-division multiplexed (SDM) transmission technique using uncoupled multi-core fibers (MCF) is considered a promising candidate for next-generation ultra-high-speed optical transport networks (OTN) due to its huge capacity potential and compatibility with existing OTN transceivers. In this paper, we demonstrate the first real-time 256 Tb/s and 448 Tb/s field trial over deployed 4-core and 7-core MCF cable using commercial 130-Gbaud probability constellation shaping 16-array quadrature amplitude modulation (PCS-16QAM) 800 Gb/s OTN transceivers with 80 wavelength channels. The 4-core and 7-core SDM transmission systems still reserve more than 4.6-dB and 3.7-dB OSNR margins respectively after 2 × 70.76-km transmission thanks to the high-baud-rate coherent modules and the low-crosstalk MCF cable. The 4-core and 7-core fibers inside the fiber cable are both utilize standard 245-μm coating, and the cabling processing has little effect on the characteristics of MCFs. This field trial demonstrates the capacity potential and implementation feasibility of uncoupled MCF in next-generation ultra-high-speed coherent optical transmission networks.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104292"},"PeriodicalIF":2.6,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144223628","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}

{"title":"Noise-suppressed optical correlation-domain reflectometry using dual lasers","authors":"Keisuke Motoda ,&nbsp;Guangtao Zhu ,&nbsp;Takaki Kiyozumi ,&nbsp;Takahiro Ishimaru ,&nbsp;Hiroshi Takahashi ,&nbsp;Kunihiro Toge ,&nbsp;Yosuke Mizuno","doi":"10.1016/j.yofte.2025.104294","DOIUrl":"10.1016/j.yofte.2025.104294","url":null,"abstract":"<div><div>We develop a new configuration of optical correlation-domain reflectometry (OCDR), termed dual-laser OCDR, which utilizes two independent laser diodes for the incident and reference light sources. We experimentally verify its operation via distributed reflectivity measurement along a 52-m-long sensing fiber under the control of the relative modulation phase between the incident and reference lights. The unique operation of dual-laser OCDR offers multiple advantages over conventional OCDR, including system simplification and constant spatial resolution over sensing position.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"94 ","pages":"Article 104294"},"PeriodicalIF":2.6,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205365","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}