Optical Fiber Technology最新文献

{"title":"Efficient fiber-coupled system based on coreless fiber end-face aspherical microlens","authors":"Zhu Ma,&nbsp;Chuxuan Deng,&nbsp;Jia Tang,&nbsp;Xiaodong Liu,&nbsp;Dinghui Luo,&nbsp;Shunshun Zhong,&nbsp;Ji’an Duan","doi":"10.1016/j.yofte.2025.104185","DOIUrl":"10.1016/j.yofte.2025.104185","url":null,"abstract":"<div><div>To enhance the applicability of non-contact optical fiber interconnects, a coreless optical fiber (COF) segment is spliced onto the tip of a single-mode fiber (SMF). Subsequently, an aspherical microlens (AM) is precisely fabricated at the COF end through grinding and polishing processes. This design aims to significantly improve the coupling efficiency (CE) of the optical fiber interconnect, addressing critical challenges in high-performance optical systems. First, the Gaussian beam propagation matrix is used to analyze the transmission characteristics of light within the aspheric microlens. Then, an optical coupling model is developed to investigate the effects of parameters such as the incident light wavelength, positional offset, angular deviation, lens diameter, lens curvature radius, refractive index, and temperature on CE. Finally, an experimental platform is constructed to validate the simulation results. The simulation results show that the CE of design and fabrication of the fiber tip microlens can reach to 92% and it shows universality for incident light wavelengths. Additionally, it obtains generous axial coupling tolerances, reducing the requirements of the assembly process.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"92 ","pages":"Article 104185"},"PeriodicalIF":2.6,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552707","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":"Radiation vulnerability of optical fiber cables for underground nuclear waste monitoring","authors":"Jérémy Perrot ,&nbsp;Adriana Morana ,&nbsp;Emmanuel Marin ,&nbsp;Youcef Ouerdane ,&nbsp;Aziz Boukenter ,&nbsp;Johan Bertrand ,&nbsp;Stéphane Poirier ,&nbsp;Hanaa Houjeij ,&nbsp;Evzen Novak ,&nbsp;Tomas Peltan ,&nbsp;Sylvain Girard","doi":"10.1016/j.yofte.2025.104181","DOIUrl":"10.1016/j.yofte.2025.104181","url":null,"abstract":"<div><div>This work presents our evaluation of the radiation vulnerability of optical fiber cables candidate to monitor temperature and strain in nuclear waste repositories. For this, the cables have been both exposed to γ-1 MGy Total Ionizing Dose (TID) and to mixed-field neutron-γ-rays up to 150 Gy TID and neutron fluence of 2.8 × 10¹³ n/cm². The effect of hydrogen-rich atmospheres is also investigated as this constraint is associated with the targeted environments. The evolution of the properties of seven optical fiber cables, differing in their compositions and structures, were evaluated during these two irradiation campaigns. Radiation-Induced Attenuation (RIA), Brillouin Frequency Shift (BFS), and Rayleigh Frequency Shift (RFS) were measured online at room temperature. Additional post-irradiation assessments have been performed: thermo-mechanical properties of both Brillouin and Rayleigh scatterings were evaluated pre- and post-irradiation, along with carbon coating H₂-blocking capabilities and radiation-induced degradation. Results demonstrated that radiation induces hydrogen diffusion from some of the cable structures, particularly from gel components. This, in addition to RIA, significantly increases the optical loss levels at infrared wavelengths under γ-rays (&gt;1200 dB/km, at 1550 nm). The study explores the origins of these losses and the radiation-induced BFS and RFS levels. Post-mortem analyses, including spectral assessments, macroscopic cable degradation observations, and hydrogenation, provided further insights into cable behavior in such conditions. A PEEK-structured cable showed notable resilience, with minimal changes in its Brillouin/Rayleigh sensitivity, no visible degradation, and the lowest H₂-blocking capability degradation under irradiation. This work offers a comprehensive qualification process for evaluating optical fiber cable performance for nuclear waste monitoring, and the findings exhibit broader implications for various nuclear industry applications.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"92 ","pages":"Article 104181"},"PeriodicalIF":2.6,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two different wavelength stopping states in a single-frequency self-sweeping fiber laser","authors":"Xianming Huang ,&nbsp;Baole Lu ,&nbsp;Chengcheng Lu ,&nbsp;Lingkang Meng ,&nbsp;Haowei Chen ,&nbsp;Jintao Bai","doi":"10.1016/j.yofte.2025.104183","DOIUrl":"10.1016/j.yofte.2025.104183","url":null,"abstract":"<div><div>In this paper, we report for the first time two different wavelength stopping states in a single-frequency self-sweeping fiber laser due to polarization state control and loss tuning, respectively. In the former, the dynamic grating disappears due to the two counter-propagating modes are orthogonal to each other, while in the latter the dynamic grating remains. The output spectrum as well as the optical signal-to-noise ratio (OSNR) of the two wavelength stopping states are able to maintain good agreement.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"92 ","pages":"Article 104183"},"PeriodicalIF":2.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527516","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":"Structural parameter dependence of differential mode delay in dual-step index core based 2LP-mode fiber","authors":"Taro Iwaya ,&nbsp;Yuto Sagae ,&nbsp;Taiji Sakamoto ,&nbsp;Takashi Matsui ,&nbsp;Takanori Sato ,&nbsp;Kunimasa Saitoh ,&nbsp;Kazuhide Nakajima","doi":"10.1016/j.yofte.2025.104172","DOIUrl":"10.1016/j.yofte.2025.104172","url":null,"abstract":"<div><div>This study investigates a structure for minimizing Rayleigh scattering loss and differential mode delay (DMD) in a dual-step index 2LP-mode fiber which is composed of a pure silica center core, F-doped outer core and F-doped cladding. The optimum structure with DMD = 0 ns/km shows a Rayleigh scattering loss reduction of 13 % compared to that of the 2LP-mode fiber with a graded-index (GI) GeO₂-doped glass core. We examined the effect of structural change on the DMD with the optimum structure and found that the structural change in the radial direction strongly affects the DMD. A radial structure change of less than 2.3 % is required to achieve low DMD in a dual-step index 2LP-mode fiber.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"92 ","pages":"Article 104172"},"PeriodicalIF":2.6,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512085","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":"Flexible and efficient network slicing scheme based on resource awareness and traffic prediction for Fi-Wi access network","authors":"Kun Li ,&nbsp;Qinghua Tian ,&nbsp;Xiangjun Xin ,&nbsp;Xiao Zhang ,&nbsp;Zuxian Li ,&nbsp;Fu Wang ,&nbsp;Wensheng Yu ,&nbsp;Feng Tian ,&nbsp;Haipeng Yao ,&nbsp;Qi Zhang","doi":"10.1016/j.yofte.2025.104176","DOIUrl":"10.1016/j.yofte.2025.104176","url":null,"abstract":"<div><div>Optical access networks are widely recognized as a pivotal technology for addressing the last-mile connectivity challenges. However, the continuous emergence of novel applications within the industrial Internet introduces unprecedented challenges to these networks. This paper proposes a resource-aware dynamic slicing scheme for Fi-Wi access networks. This proposed scheme adheres to the ISA-95 standard and seamlessly integrates network slicing technology into optical access networks. The scheme uses a resource-aware model to select the optimal path and reduce processing latency. LSTM-Attention is introduced for traffic prediction, reducing the delay in slice adjustments caused by large-scale traffic. Simulation results show that this scheme can efficiently select the optimal path, reserve more resources for services, and has a lower bandwidth blocking rate compared to traditional DES and LSTM methods.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"92 ","pages":"Article 104176"},"PeriodicalIF":2.6,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512083","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":"Polarization-multiplexed single-cavity dual-comb fiber laser and its running condition for ranging","authors":"Haonan Gong ,&nbsp;Xiaorong Gu ,&nbsp;Gaowei Wang ,&nbsp;Jiming Wang ,&nbsp;Yiqiu Liang ,&nbsp;Rui Guo ,&nbsp;Yao Li ,&nbsp;Youwen Liu","doi":"10.1016/j.yofte.2025.104179","DOIUrl":"10.1016/j.yofte.2025.104179","url":null,"abstract":"<div><div>We have firstly demonstrated a free-running, polarization-multiplexed, single-cavity dual-comb fiber laser with a simplified linear-cavity configuration. The repetition rate of the laser is around 86.3 MHz while its repetition rate difference can be tuned from 1.0 kHz to 1.8 kHz. Then, it is verified that the ranging precision by this dual-comb source can be optimized according to the carrier frequency of the beat interferogram signal. When the interferogram’s carrier frequency is centered at 26 MHz by tuning the mode-locking state of the laser, a ranging precision of 392 nm is achieved with 67 ms averaging time. In further, we have found the radio frequency spectrum of the interferogram signal is hardly influenced by the change of the repetition rate difference, which leads to the consistency of the distance measurement. This result indicates dual-comb ranging by this compact single-cavity fiber laser is potentially robust to environmental disturbance and this laser source can be a good candidate for other dual-comb applications.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"92 ","pages":"Article 104179"},"PeriodicalIF":2.6,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508687","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":"Stable L-band single-frequency erbium fiber laser by applying parity-time symmetric sagnac ring design","authors":"Chi-Chin Wu,&nbsp;Wen-Hao Hung,&nbsp;Kuan-Ming Cheng,&nbsp;Lan-Yin Chen,&nbsp;Yu-Ting Lai,&nbsp;Chun-Yen Lin,&nbsp;Tsu-Hsin Wu,&nbsp;Teng-Yao Yang,&nbsp;Chien-Hung Yeh","doi":"10.1016/j.yofte.2025.104180","DOIUrl":"10.1016/j.yofte.2025.104180","url":null,"abstract":"<div><div>A Sagnac ring with parity-time (PT) symmetry design is included to the L-band EDF ring laser to achieve single-longitudinal-mode (SLM) operation. The PT symmetry configuration can cause two opposite lightwave propagation direction to induce the gain and loss effect, when the polarization states of two lightwaves are adjusted by two polarization controllers (PCs) accurately. Once the gain and loss coefficient are greater than coupling coefficient, the SLM output can be reached. Furthermore, the wavelength tunability range, power output, linewidth, optical signal to noise ratio (OSNR) and stability of the EDF Sagnac ring laser presented are experimentally performed.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"91 ","pages":"Article 104180"},"PeriodicalIF":2.6,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471176","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":"Annular micro-nano optic fiber sensor based on α-Fe2O3@SiO2@CS imprinting for Cu(II) ion detection","authors":"Yue Feng ,&nbsp;Weixiang Yuan ,&nbsp;Wenbo Hao ,&nbsp;Tao Shen","doi":"10.1016/j.yofte.2025.104174","DOIUrl":"10.1016/j.yofte.2025.104174","url":null,"abstract":"<div><div>Sensors for the rapid and easy detection of copper ions (Cu²⁺) are crucial in drinking water and healthcare. However, this research is still challenging, such as more complicated sample pretreatment and longer detection time. In this paper, a highly sensitive optic fiber sensor for trace detection of Cu²⁺ in aqueous solution is proposed. Based on the principle of intermodal interference, the coating method of surface functionalization of functional groups is adopted, and the single-mode fiber (SMF) is bent to form an annular structure to enhance the interference, and the cone pulling machine is used to perform cone pulling treatment before coating a uniform layer of α-Fe₂O₃@SiO₂@CS nanocomposite imprinted material. The amino and hydroxyl groups have specific recognition functions for Cu²⁺ and can chelate with Cu²⁺, thus changing the refractive index of the material, which in turn makes the interference spectrum shifted. Furthermore, Cu²⁺ is chosen as the template ion to make ion-imprinted materials, and the trace detection of Cu²⁺. The results showed that the interference spectrum was red-shifted with the increase of Cu²⁺ concentration in the range of 0–1 μM with a concentration dependence coefficient of 3.35 nm/log·μM, and the maximum detection sensitivity of Cu²⁺ reached 1232.52 nm/μM with a good linearity of 0.994. The selectivity of Cu²⁺ was more than 70 times that of other ions. In addition, the sensor has the advantages of fast response time, high stability, good reproducibility, simple fabrication and low cost.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"91 ","pages":"Article 104174"},"PeriodicalIF":2.6,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453341","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 refractive index sensor based on ultrafine conical no-core optical fiber","authors":"Yuxuan Qi ,&nbsp;Hailong Liu ,&nbsp;Ying Chen ,&nbsp;Jiacheng Lv ,&nbsp;Yubo Liu ,&nbsp;Yanjie Zhao ,&nbsp;Jiasheng Ni","doi":"10.1016/j.yofte.2025.104175","DOIUrl":"10.1016/j.yofte.2025.104175","url":null,"abstract":"<div><div>A high-sensitivity refractive index (RI) sensor based on a Mach-Zehnder Interferometer (MZI) configuration utilizing ultrafine tapered no-core fiber (Tapered No-Core Fiber, TNCF) is proposed and fabricated. The sensor consists of a single-mode fiber (SMF) – no-core fiber (NCF) – single-mode fiber (SMF) structure, with a tapered configuration formed in the no-core fiber region via the fusion tapering process. Multi-mode interference (MMI) and the excitation of higher-order modes within the tapered region significantly enhance the evanescent field effect of the light beam, thereby improving the sensor’s sensitivity to refractive index variations. Three sensors with tapered waist diameters of 60.1 μm, 41.2 μm, and 22.1 μm were fabricated. Experimental results show that, within refractive index ranges of 1.338–1.358 and 1.347–1.405, the refractive index sensitivity of the sensor increases significantly as the waist diameter of the tapered region decreases. When the tapered waist diameter is 22.1 μm, the refractive index sensitivity reaches 617.60 nm/RIU and 643.36 nm/RIU, with linearity coefficients of R² = 0.9835 and R² = 0.9994, demonstrating excellent sensitivity and linear performance. The proposed sensor not only exhibits high sensitivity, structural stability, and a wide measurement range, but also demonstrates suitability for high-precision refractive index measurements in the fields of medicine, biological sensing, and energy.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"91 ","pages":"Article 104175"},"PeriodicalIF":2.6,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453342","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":"Inter-sequence-attention Transformer network for distributed fiber-optic sensing signal recognition","authors":"Junyi Duan,&nbsp;Jiageng Chen,&nbsp;Zuyuan He","doi":"10.1016/j.yofte.2025.104171","DOIUrl":"10.1016/j.yofte.2025.104171","url":null,"abstract":"<div><div>Distributed fiber-optic acoustic sensing (DAS) is an emerging technology which can capture acoustic waves everywhere along the sensing fiber. The recognition of such spatial-temporal sensing data is a crucial step in some applications of DAS. In this work, we extend the Transformer neural network well known for its state-of-the-art performance in sequential tasks into an inter-sequence form, mainly by rearranging the query matrices, key matrices, and value matrices separately from each temporal sequence, into piles of matrices that each matrix contains information from all sequences, consequently getting inter-sequence attention weights and attention matrices. The network is named inter-sequence-attention Transformer (ISAT), which simultaneously extracts the temporal and spatial joint features of DAS data, while explicitly preferring temporal dimension to spatial dimension rather than treating them equally like in 2D convolution neural networks (CNNs). According to evaluation results based on the open dataset, the ISAT network shows an improvement in aspects of both recognition accuracy and parameter efficiency compared with previously proposed networks.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"91 ","pages":"Article 104171"},"PeriodicalIF":2.6,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437483","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}