{"title":"Tapered POF-SPR sensor for dual-channel measurement of refractive index and temperature","authors":"Zhitao Yang, Lingzui Wei, Zehong Xu, Fenglei Zhao, Sijia Han, Songlin Jia","doi":"10.1016/j.yofte.2025.104385","DOIUrl":"10.1016/j.yofte.2025.104385","url":null,"abstract":"<div><div>Temperature is a key parameter that affects the performance of optical fiber sensors. In this work, we designed a tapered surface plasmon resonance (SPR) sensor based on plastic optical fiber (POF), and the sensor’ s sensitivity to liquid refractive index (RI) and temperature was investigated separately. The results show that when the taper ratio of the sensor is 2.80, its sensitivity can reach 2890.536 nm/RIU within the RI range of 1.333 ∼ 1.433. After coating a polydimethylsiloxane (PDMS) temperature-sensitive film on the Ag film in the sensing area, within the temperature ranges of 0 ∼ 96 °C and − 40 ∼ 0 °C, the temperature sensitivities reach −0.906 nm/°C and −1.807 nm/°C, respectively, and demonstrating high linearity and cyclic stability. We further developed a dual-channel sensor for simultaneous measurement of RI and temperature. The results demonstrate that within the RI range of 1.333 ∼ 1.373 and temperature range of 10 ∼ 60 °C, the sensitivities for RI and temperature are 1845.603 nm/RIU and −0.891 nm/°C, respectively. The proposed dual-channel plastic optical fiber SPR sensor offers advantages such as low cost, high sensitivity, low crosstalk, and simple fabrication, making it promising for research and application in fields such as biology and medicine.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104385"},"PeriodicalIF":2.7,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057269","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}
Siyu Wan , Shuang Zhou , Chenxi Wang , Deen Wang , Xiaolan Sun
{"title":"Optical fiber sensor for pyrophosphate detection using Cu2+-responsive polymer-modified PbS quantum dots","authors":"Siyu Wan , Shuang Zhou , Chenxi Wang , Deen Wang , Xiaolan Sun","doi":"10.1016/j.yofte.2025.104382","DOIUrl":"10.1016/j.yofte.2025.104382","url":null,"abstract":"<div><div>We report a compact optical fiber sensor for selective detection of pyrophosphate (PPi), based on a tapered interferometer coated with amphiphilic polymer-modified PbS quantum dots (P-QDs). The amphiphilic polymer enhances QD solubility and stability, while providing oxygen-rich groups for Cu<sup>2+</sup> coordination. PPi competitively displaces Cu<sup>2+</sup>, leading to photoluminescence recovery and refractive index changes that yield a dual optical response. The sensor achieves a detection limit of 56.25 μM and excellent repeatability. Compared with conventional enzymatic or colorimetric assays, this fiber-integrated system offers operational simplicity, real-time monitoring capability, and robustness in complex aqueous environments. Beyond PPi, the P-QD/fiber platform provides a versatile framework for extending quantum-dot–based sensing to other biomedical and environmental analytes.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104382"},"PeriodicalIF":2.7,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047193","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":"Performance evaluation of two-stage and three-stage triple pass PDFAs in O-band","authors":"Hasan Cihangir , Murat Yücel","doi":"10.1016/j.yofte.2025.104388","DOIUrl":"10.1016/j.yofte.2025.104388","url":null,"abstract":"<div><div>Tunable laser source (TLS), <span><math><msup><mrow><mi>P</mi><mi>r</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> doped fiber (PDF), and pump laser are the main design components for the praseodymium doped fiber amplifier (PDFA) design. Determination of the important parameter values of these components for the design is quite essential in terms of cost and performance (e.g., gain, power conversion effect [PCE]). For TLS, signal wavelength and power; for PDF, PDF length, ion density, upconversion, numerical aperture, core radius, doping radius, and operating environment temperature; pump laser, pump power, and pump wavelength are the critical design parameters. Another factor that will improve the performance of the amplifier is the amplifier configuration. Although there are single-pass and double-pass PDFA studies in the literature, in this article, for the first time, the simulation, parameter optimization, and analysis of two-stage triple-pass PDFA (2P3S-PDFA) and three-stage triple-pass PDFA (2P3S-PDFA) are performed. The performances of 2P3S-PDFA and 2P3S-PDFA are compared in terms of gain and noise figure (NF). The optimum gain obtained for 2S3P-PDFA is 49,4 dB, and the NF at this point is around 6,5 dB. For 3S3P-PDFA, the optimum gain is 47,7 dB and the NF at this point is around 5,1 dB. When we look at the two amplifier types in general, 2S3P-PDFA performs better than 3S3P-PDFA in terms of optimum gain by around 1,7 dB. However, in terms of NF, 2S3P-PDFA has more NF than 3S3P-PDFA by around 1,6 dB. As a result of the optimization, it is seen that the 2S3P-PDFA system is more efficient than the 3S3P-PDFA system in terms of gain.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104388"},"PeriodicalIF":2.7,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047188","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":"Tunable random laser with a cavity based on an erbium-doped germanophosphosilicate artificial Rayleigh fiber","authors":"S.M. Popov , A.A. Rybaltovsky , A.M. Smirnov , A.P. Bazakutsa , A.S. Shikin , D.V. Ryakhovskiy , V.V. Voloshin , A.O. Kolosovskii , I.L. Vorob’ev , Yu.K. Chamorovskiy , D.S. Lipatov , O.V. Butov","doi":"10.1016/j.yofte.2025.104405","DOIUrl":"10.1016/j.yofte.2025.104405","url":null,"abstract":"<div><div>This study is devoted to the construction and investigation of a tunable random laser with a cavity based on weak fiber Bragg gratings (the so-called artificial Rayleigh fibers) inscribed in a 3-m-long active fiber. An array of weak fiber Bragg gratings (wFBGs) is inscribed using an ultraviolet (UV) excimer laser operating in pulsed mode and a chirped phase mask during the optical fiber drawing process. The inscription of a wFBG array by a UV laser is performed using a specially designed photosensitive germanophosphosilicate preform doped with erbium ions. It is found that, in a semi-open cavity configuration, the narrow-band generation peak can be tuned within the wavelength range of 1546.5–1547.5 nm by stretching the 90 %-reflective FBGs. The resulting random lasing is characterized by a maximum efficiency of 10 % at an output power of 1 mW under backward pumping at a wavelength of 976 nm. It is established that the tunable random laser operates in continuous-wave mode with a linewidth of ∼470 Hz.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104405"},"PeriodicalIF":2.7,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047191","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}
Ruoning Wang , Haidong Shao , Zhiruo Wu , He Tian , Cuiting Sun , Tao Geng
{"title":"A high sensitivity strain sensor based on a long-period fiber grating with curvilinear core in taper structure","authors":"Ruoning Wang , Haidong Shao , Zhiruo Wu , He Tian , Cuiting Sun , Tao Geng","doi":"10.1016/j.yofte.2025.104400","DOIUrl":"10.1016/j.yofte.2025.104400","url":null,"abstract":"<div><div>In this article, a highly sensitive strain sensor based on a long-period fiber grating (LPFG) with curvilinear core in taper structure (CT-LPFG) is described. The proposed LPFG has been fabricated by periodically cutting and electro-discharge along the axis of single-mode fiber (SMF). It consists of curvilinear core taper structures, all of which exhibit asymmetry along the axis. This fabrication method converts SMF into the optical fiber with special cores. The unique design of the curvilinear core and tapered cladding has achieved the effect of improving strain performance of the sensor. Experimental results indicate that the CT-LPFG achieves a maximum strain sensitivity of −250.43 pm/με within 0–300 με. The sensor also exhibits a temperature sensitivity of 0.2 nm/℃. This structure combines high strain sensitivity with low manufacturing cost and easy fabrication.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104400"},"PeriodicalIF":2.7,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047192","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}
Kaixuan Zheng , Yan Liu , Lanling Lan , Yuanyuan Zhang
{"title":"Solar dual-end-pumped single crystal fiber laser with conical reflector","authors":"Kaixuan Zheng , Yan Liu , Lanling Lan , Yuanyuan Zhang","doi":"10.1016/j.yofte.2025.104390","DOIUrl":"10.1016/j.yofte.2025.104390","url":null,"abstract":"<div><div>To enhance the output power and solar-laser conversion efficiency of a solar-pumped single crystal fiber (SCF) laser, we propose a dual-end-pumped configuration based on a hollow conical reflector. The three-stage solar concentrator consists of parabolic mirrors, 3D-CPCs, and hollow conical reflector, in which the SCF is placed. The DDE is used to establish an information exchange channel between Matlab and TracePro to optimize the position of the SCF based on simulated annealing algorithm. For the same sunlight-receiving area (1.2 m<sup>2</sup>), ray tracing with Tracepro shows that the solar power absorbed by the dual-end-pumped SCF (Φ1 × 100 mm, 1at.% doping concentration) is enhanced by 48.03 % compared to the single-end-pumped configuration when the third-stage concentrator is a hollow cylindrical reflector. When the third-stage concentrator is a 2-stage conical reflector, the solar power absorbed by the SCF can be effectively improved and reach 140.81 W. Solving the rate equations and the power transmission equations, the maximum laser output power and the solar-laser conversion efficiency of the solar pumped SCF laser are 47.84 W and 3.96 %.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104390"},"PeriodicalIF":2.7,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047190","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}
Zhuan Zhao , You Wu , Weilong Chen , Jinrui Xiao , Teng Ma
{"title":"Al2O3 and SiO2 doping on improving the gamma radiation resistance of optical fibers under different temperatures","authors":"Zhuan Zhao , You Wu , Weilong Chen , Jinrui Xiao , Teng Ma","doi":"10.1016/j.yofte.2025.104403","DOIUrl":"10.1016/j.yofte.2025.104403","url":null,"abstract":"<div><div>In this work, single mode fibers with coatings doped with SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> were developed and their radiation induced attenuation (RIA) spectra at 1310 nm were analyzed. These results were compared to undoped fibers and two commercially used single mode fibers, G652, PM1016-C during and after γ-irradiation at different temperatures. Results show that the fibers doped with SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> exhibited significant lower attenuation than other fibers. At a temperature of −45 °C and a gamma irradiation dose of 2 kGy, the doped fibers showed an RIA of only 0.73 dB/Km, while the other fibers experienced losses exceeding 8 dB/km. Even when the irradiation dose was increased to 200 kGy, the prepared fiber exhibited a maximum attenuation of just 4.37 dB/km, which is still lower than the others. Furthermore, the doped fibers demonstrated rapid recovery of attenuation levels after the irradiation was removed. The resulted indicate that the incorporation of Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> significantly enhances radiation resistance. This study provides valuable insights for designing high-performance, radiation-resistant fibers suitable for use in harsh environments, such as deep space, where radiation exposure is intense.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104403"},"PeriodicalIF":2.7,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047189","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}
Jin. Li , Liyun. Yang , Jinjing. Zuo , Renshu. Yang , Xiang. Zhang , Yuanyuan. You , Yiqiang Kang
{"title":"Crack monitoring in cement mortar under impact loading using distributed optical fiber sensing","authors":"Jin. Li , Liyun. Yang , Jinjing. Zuo , Renshu. Yang , Xiang. Zhang , Yuanyuan. You , Yiqiang Kang","doi":"10.1016/j.yofte.2025.104386","DOIUrl":"10.1016/j.yofte.2025.104386","url":null,"abstract":"<div><div>Distributed fiber-optic sensing techniques based on Rayleigh scattering are widely used to monitor strain field evolution caused by crack initiation and propagation in structures. However, a universal specimen design for crack identification and monitoring under dynamic loading remains lacking. This study investigates the feasibility of using the optical frequency domain reflectometry (OFDR) technique for crack monitoring in cement mortar samples subjected to drop-hammer three-point bending tests. Experiments were conducted on samples embedded with distributed optical fiber sensors of varying diameters. The strain distribution was accurately captured using 2 mm and 2.5 mm optical fibers, allowing for crack detection at peak strain values and precise localization. The discrepancy between the actual crack position and the peak strain location was within 2 mm, while the error between the calculated and measured crack opening displacement (COD) remained within ±10 %. These findings confirm that OFDR enables accurate identification of crack location and width under impact loading. Moreover, the technique can predict crack initiation and propagation trends, demonstrating its potential for dynamic structural health monitoring.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104386"},"PeriodicalIF":2.7,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047187","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":"Harmonic mode-locking in All-PM Er-doped fiber laser NALM configuration","authors":"V.A. Ribenek , D.A. Korobko , D.A. Stoliarov , P.A. Itrin , G.V. Tertyshnikova , A.A. Fotiadi","doi":"10.1016/j.yofte.2025.104392","DOIUrl":"10.1016/j.yofte.2025.104392","url":null,"abstract":"<div><div>It is known that passive harmonic mode-locking (HML) is a widely used technique to achieve high pulse repetition rates in fiber lasers. We present, to the best of our knowledge, the first demonstration of harmonically mode-locked Er-doped fiber laser with sub-GHz repetition rate based on a nonlinear amplified loop mirror (NALM). This fully spliced, polarization-maintaining (PM) fiber configuration operates in a self-starting regime, delivering high-frequency pulse trains with significantly enhanced stability against environmental perturbations. The laser achieves a maximum pulse repetition rate (PRR) of ∼ 630 MHz, corresponding to the 242nd cavity harmonic. Furthermore, we apply a supermode noise mitigation technique using continuous-wave (CW) injection from an external narrow-band source successfully stabilizing the HML operation and reducing timing jitter by more than a factor of two across the entire range of observed repetition rates. This novel design provides a robust, adjustment-free solution for high-frequency operation with exceptional stability, meeting the demands of precision and reliability required for advanced applications.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104392"},"PeriodicalIF":2.7,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011172","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}
Monica T. Kalichevsky-Dong, Samuel P. Bingham, Thomas W. Hawkins, Jannatul M. Nijhum, Liang Dong
{"title":"Diffraction-limited 308 W at ∼980 nm from a monolithic ytterbium fiber laser","authors":"Monica T. Kalichevsky-Dong, Samuel P. Bingham, Thomas W. Hawkins, Jannatul M. Nijhum, Liang Dong","doi":"10.1016/j.yofte.2025.104396","DOIUrl":"10.1016/j.yofte.2025.104396","url":null,"abstract":"<div><div>Diffraction-limited 308 W at ∼980 nm from a monolithic ytterbium fiber laser operating at the three-level laser system has been demonstrated, limited only by the available pump power, doubling the previous record and showing significant potential for further power scaling thanks to the availability of high brightness pumps and ytterbium-doped all-solid photonic bandgap fibers optimized for suppressing the four-level system. New record slope efficiencies of 72 % and 81 % for three-level lasers with regard to launched and absorbed pump powers respectively are also set.</div></div>","PeriodicalId":19663,"journal":{"name":"Optical Fiber Technology","volume":"95 ","pages":"Article 104396"},"PeriodicalIF":2.7,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011173","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}