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Fast response multi-segment anti-resonant hollow-core fiber methane sensor at 1687 nm Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-03-11 Grzegorz Gomółka, Adam Filipkowski, Dariusz Pysz, Ryszard Buczyński, Michał Nikodem
Typically, hollow-core fiber (HCF)-based laser gas sensing systems use a single monolithic fiber as a gas cell. This results in a tradeoff between sensitivity which requires long optical fiber and sensor’s response time, that grows with the fiber length. Here we present a simple approach to solve this issue with new all-fiber modular gas cell design. The setup uses modified fiber mating sleeves to
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High accuracy pressure and temperature simultaneous measurement based on forward Brillouin scattering in highly nonlinear fiber Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-03-08 Meng Zhu, Yuangang Lu, Zelin Zhang, Pengkai Liu, Wujun Zhang
An original method for high accuracy pressure and temperature simultaneous sensing is proposed, which is based on forward Brillouin scattering (FBS) spectra induced by high-order radial and torsional-radial acoustic modes in highly nonlinear fiber (HNLF). Firstly, a novel method for selecting suitable sensing fiber with a high FBS gain coefficient is proposed, and an HNLF is selected for high accuracy
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Research on the tunable and switchable erbium-doped fiber laser based on PHB with parallel Lyot filter Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-03-08 Weihua Zhang, Xiang Gao, Dianyou Song, Zhengrong Tong, Junpeng Zhou, Xue Wang, Lifang Xue, Peng Li
In this paper, the tunability and switchability of the proposed multi-wavelength erbium-doped fiber laser (EDFL) with a parallel Lyot filter are verified by experiments. The parallel Lyot filter provides the polarization hole burning (PHB) effect to reduce the mode competition, resulting in a comb spectrum. For the laser cavity, the polarization state can be changed by adjusting the polarization controllers
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Highly accurate diaphragm FBG high pressure gas sensor Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-03-07 Long Chen, Xinglin Tong, Wenzhong Huang, Fanchao Zeng, Chengfei Li, Yuhan Wang, Xuefeng Shi, Chuan Zeng, Zekai Li
Large quantities of flammable and explosive gases are often used in various production processes in the chemical and energy industries. these gases, if leaked or improperly operated, can cause serious production accidents. Therefore, in order to meet the requirement for miniaturized, highly accurate, long-term stable and large-range high pressure sensors for flammable and explosive gases in industrial
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Fiber temperature sensor based on Fabry-Pérot cavity generating optical Vernier effect Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-03-06 Yangmei Liu, Zhongwei Tan, Zhenyu Gu, Si Sun, Shun Lu
A fiber temperature sensor consisting of two cascaded reflective film-fiber-reflective film Fabry-Pérot (FP) cavities is proposed. The lengths of the two FP cavities are similar, but with small differences in their free spectral ranges (FSR) to create Vernier effect. The sensor operates similar to a Vernier caliper, where one FP cavity serves as a reference and the other as a sensing element. Experimental
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Tunable narrow linewidth fiber laser based on parity-time symmetric double rings and variable optical attenuator Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-03-05 Jiaming Chen, Zhigang Cao, Hefei Li, Siyang Zhao, Yuxuan Fu, Wenyu Du, Ya Gao, Shu Jin, Benli Yu, Zhijia Hu, Siqi Li
A tunable narrow linewidth fiber ring laser based on parity-time (PT) symmetric double rings and variable optical attenuator (VOA) is demonstrated. The laser is composed of a fiber loop mirror (FLM), which creates two coupled rings: the reflective ring and the transmissive ring. The loss of the transmissive ring can be controlled by tuning the VOA, which balances with the gain of the reflective ring
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Underwater acoustic sensor based on microfiber knot resonator Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-03-02 Xiaoping Zhai, Wendong Zhang, Jiangong Cui, Haoming Huang, Yajie Wang, Guojun Zhang, Renxin Wang, Yuhua Yang, Yonghua Wang
In this paper, a water acoustic sensor based on a microfiber knot resonator is proposed. It utilizes microfiber technology, resulting in a smaller sensor size and excellent detection capability for low-frequency signals. By developing suitable packaging techniques to protect the sensor, it becomes more suitable for underwater detection environments and increases the stability of the device. Polydimethylsiloxane
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Effect of thermal expansion to the coupling efficiency of (1 + 1) long distance side pumping fiber Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-03-01 Nian Liu, Fengyun Li, Chun Zhang, Yi Chen, Cong Gao, Rumao Tao, Jianjun Wang, Honghuan Lin, Jiangyun Dai
With the same fiber preform, two long distance side pumping fibers were fabricated and measured based on a master oscillator power structure. The residual pump power tendency of the two fibers were obtained in experiment. It was found the residual pump power would arise rapidly when the power reached turning point, which was defined by derivative value of residual pump power to pump power equal to
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Highly sensitive magnetostrictive sensor with well-sealed and sensitivity tunability Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-29 Chunbo Su, Xuanting Liu, Yuqi You, Yiwei Ma, Tao Geng
In this article, we propose and experimentally testified a highly sensitive magnetostrictive sensor with well-sealed and sensitivity tunability. The sensor is consisted of a Terfenol-D cylinder and a fiber-optic Mach-Zehnder interferometer (MZI) affixed inside the cylinder. As an energy transducer, the Terfenol-D converts the external magnetic field into stress, which is applied to the fiber structure
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Sensitivity improvement of an optical fiber SPR sensor based on gallium sulfide Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-29 Hongshen Liu, Nuerguli Kari, Jinda Liu, Hang Li, Qi Wang
Optical fiber Surface plasmon resonance (SPR) sensors are applied in the field of biological monitoring widely. This paper presents a novel method to improve the sensitivity of optical fiber SPR sensor by using gallium sulfide (GaS) nanosheets. Compared with traditional two-dimensional materials, gallium sulfide has a higher refractive index and higher carrier mobility, which can effectively enhance
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UiO-66@Allylthiourea film coated optical fiber cadmium ion sensor with spiral grating temperature compensator Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-28 Hailong Fan, Weizhun Dong, Kunshan Yang, Weijuan Chen, Cheng Ren, Xiu Du, Xinwei Wang, Fangfei Shi, Lingxin Kong
In this article, we proposed a gold film-coated spiral fiber grating (SFG) sensor, which can simultaneously generate surface plasmon resonance (SPR) spectra and grating spectra. A layer of UiO-66@allylthiourea composite film has grown on the surface of the gold film to be used for the specific detection of cadmium ions (Cd). The allylthiourea group exhibits a specific binding affinity to Cd, and the
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Numerical investigation into splicing mismatch in a large mode area double clad fiber for high power lasers Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-28 Ingwon Kim, Suh-young Kwon, Minwan Jung, Ju Han Lee
In the present work, we conducted a numerical simulation to investigate the impact of fiber core misalignment on the output beam quality of large mode area double-clad fiber (DCF), which is commonly used in high-power laser systems. By employing the beam propagation method, we analyzed the influence of higher-order core modes and cladding modes on beam quality resulting from axial offset in the fiber
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Optimizing elastic optical networks quality of transmission with an empirical optical amplifier gain saturation model Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-28 M. Ayaz, L. Beygi
In this paper, we revisit the problem of adjusting transceiver power, amplifier gain, and nodal gain in optical-bypass-enabled networks, taking into account an empirical model of erbium-doped fiber amplifier (EDFA) gain saturation. We assume that network demands have been routed via the shortest possible paths. A heuristic algorithm, which estimates the degradation of the signal-to-noise ratio (SNR)
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Ultra-sensitive strain sensor composed of tapered two-mode fiber micro-cantilever inserted into quartz capillary Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-28 Longfeng Deng, Chao Jiang, Xiaoshan Guo, Simei Sun, Guozhou Jiang, Tingshui Cao, Yukun Shu, Changning Liu, Huiling Huang
An ultra-sensitive strain sensor has been designed using two parallel Fabry-Perot interferometers (FPI) as well as the Vernier effect (VE) and harmonic vernier effect (HVE). This new FPI is formed between tapered two-mode fiber cantilever beam inserted into quartz capillary and single-mode fiber. We prepared two similar cantilever beam structures, namely FPI and FPI. Due to the cantilever beam inserted
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High-sensitivity optical fiber SPR temperature sensing probe based on Au-PDMS@Au coating Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-27 Ting Liu, Zhipeng Lin, Changfei Lai, Wei Guo, Shouyu Wang
To enhance the sensitivity of polydimethylsiloxane (PDMS)-based optical fiber surface plasmon resonance (SPR) temperature sensing probes, we propose a new prototype with a PDMS@Au sensing layer on the gold (Au) film of the multi-mode fiber (MMF)-single-mode fiber (SMF)-MMF heterojunction structure. This designed probe has improved the temperature sensitivity from −1.26 nm/°C (Au-PDMS) to −2.14 nm/°C
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Study of hybrid integrated PLC-AWG chip for FBG demodulation Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-27 Yiyao Yang, Pei Yuan, Ran Xu, Bingxiang Li, Shufeng Li, Ting Li, Lianqing Zhu
Fiber Bragg grating (FBG) sensors have been widely used in various fields. To develop a miniaturized, high-precision, and high-response FBG interrogation system, arrayed waveguide grating (AWG) has been widely used as a key device. In this paper, a 40-channel arrayed waveguide grating based on silica planar lightwave circuits (PLCs) is designed fabricated, coupled to a photodetector array using hybrid
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All-Optical format conversion from PAM4 to QPSK based on non-degenerate Phase-Sensitive amplification and pump assisted nonlinear optical loop mirror Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-26 Qiankun Li, Huashun Wen, Qi Xu, Yameng Li, Xiongwei Yang, Jiali Yang, Yong Li, Huajun Yang, Heng Zhou
An all-optical format conversion (AOFC) scheme from 4-ary pulse amplitude modulation (PAM4) to quadrature phase shift keying (QPSK) based on the non-degenerate phase-sensitive amplification (PSA) and the pump assisted nonlinear optical loop mirror (PA-NOLM) is proposed and numerically simulated for the first time. The input unipolar PAM4 signal with equal amplitude distance (UPAM4-A) is coupled with
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Vanadium germanium Carbide: A Cutting-Edge thin film saturable absorber for Q-switching laser generation Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-26 R.A.M. Yusoff, N.A.A. Ramlan, N. Kasim, N.F. Zulkipli, A.H.A. Rosol, A.A.A. Jafry
Q-switched Erbium-doped fiber laser (EDFL) has been successfully showcased with the utilization of vanadium germanium carbide (VGeC) as a saturable absorber (SA). For the preparation of the MAX phase solution, 10 mg of VGeC powder was added into 100 ml of a 40 % of isopropanol alcohol (IPA) solution and the SA film was fabricated by mixing the 25 ml of VGeC-IPA solution with 25 ml of polyvinyl alcohol
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Wavelength injection locking actively Q-switched with wide locking range random fiber laser based on single-mode fiber Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-24 Bo Zhang, Honggang Pan, Yadong Zhu, Dongmeng Wang, Chunqi Chen, Rupeng Li
In this paper, a wavelength injection locking actively Q-switched wide locking range random fiber laser (RFL) based on single-mode fiber (SMF) is proposed. Within the C-band range from 1530 nm to 1565 nm, different laser modes can be selected by changing the wavelength of the injected light. Under injection locking state, the power fluctuation within one hour is less than 0.1dBm. When high nonlinear
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Photonic self-interference cancellation for RoF-based in-band full-duplex link in wireless fronthaul access network Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-23 Jianxin Ma, Mingxiao Wang
Photonic self-interference cancellation (SIC) for radio over fiber (RoF)-based full-duplex fronthaul link is proposed. In the remote unit, a portion of the downlink single sideband (SSB) optical millimeter (mm)-wave signal is abstracted, and its optical carrier and first-order sideband are separated and reused for carrying the uplink mm-wave signal and as a reference signal for RF SIC of uplink optically
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Kerr lens mode locked operation in an erbium-doped fiber laser modulated by silica tapered fiber Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-23 Xiwen Jiang, Wenhao Lv, Yan Xu, Chenghao Cui, Meixia Zhang, Wenfei Zhang, Xiaojuan Liu
A highly stable Kerr lens mode locked (KLML) erbium-doped fiber laser (EDFL) modulated by silica tapered fiber is systematically demonstrated for the first time. Compared to usual silica fiber, the prepared silica tapered fiber possesses much larger nonlinear efficiency, and the significant Kerr lens (KL) effect facilitates the generation of conventional solitons (CSs) as well as soliton molecules
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Solid-core photonic crystal fiber with high acoustic pressure sensitivity Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-23 Xiaobin Xu, Jinjing Xie, Fuyu Gao, Ningfang Song
This study reports the design and fabrication of a Φ60/100-μm solid-core photonic crystal fiber with high acoustic pressure sensitivity. By decreasing the diameter of the cladding and increasing the proportion of air holes in the cladding, the equivalent Young’s modulus of the cladding was reduced, and the acoustic pressure sensitivity of the optical fiber was improved. The simulation and test results
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Frequency response optimization of optical fiber acceleration sensor based on compliant cylinder Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-22 Shili Li, Zhengxu Cao, Zhixin Dong, Lei Tang, Duliang Zhao, Jinhui Shi, Xuqiang Wu, Benli Yu
In coal mine, military, oil well monitoring and other fields, the traditional electrical accelerometers based on piezoelectric and capacitive can not meet the needs of high-performance applications. The optical fiber acceleration sensor with high precision, large dynamic, wide frequency response, anti-electromagnetic interference and other unique advantages, can meet a variety of applications. The
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Numerical algorithms for nonlinear propagation in multimode optical fiber communication systems Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-21 Oleg Sidelnikov, Mikhail Fedoruk, Stefan Wabnitz
In this work we introduce new numerical compact finite-difference algorithms for modeling nonlinear signal propagation in transmission systems based on multimode optical fibers, in the presence of nonlinearity and random linear mode coupling. We compare the computational efficiency of these methods with respect to the standard split-step Fourier method, for different regimes of random mode coupling
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Intelligent detection and recognition of multi-vibration events based on distributed acoustic sensor and improved YOLOv8 model Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-20 Ying-ying Wang, Shi-wei Zhao, Chang Wang, Hong-bo Zhang, Xiang-dong Li
A novel method is proposed for accurate and real-time detection and recognition of multi-vibration events in perimeter security air-ground integration. This method utilizes a distributed optical fiber sensor and the YOLO (You Only Look Once) method. Specifically, we employ a distributed optical fiber acoustic wave sensing technology based on a phase-sensitive optical time-domain reflectometer (Φ-OTDR)
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Modeling analysis and experimental study on epoxy packaged FBG sensor for cryogenic temperature measurement Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-19 Yunhao Ren, Han Song, Qihui Cai, Zijian Cai, Yi Liu, Boyi Wang
The Fiber Bragg grating (FBG) is a kind of temperature-sensitive optical device that has irreplaceable advantages for cryogenic measurement. In this work, a model-driven FBG temperature sensor packaging method was proposed to improve the sensor’s sensitivity and linearity and predict the sensor's response time in cryogenic. The numerical model explores the relationship between the sensor’s size and
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Fiber Bragg grating-based flume tests for inversing the impact force coefficient of debris flow Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-19 Xia Manyu, Zhang Shaojie, Yang Chaoping, Yang Hongjuan, Wei Fangqiang
In the piezoelectric sensor-based debris flow flume tests, the impact force coefficient () obtained from inversion has a significant dispersion range, which causes considerable uncertainty in the debris flow impact force. To reduce the dispersion range of , this study designed a new measurement system by integrating the Fiber Bragg Grating (FBG) and the elastic cantilever beam as the core sensing unit
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CW mode-locked fiber laser by improved all-polarization-maintaining figure-9 cavity at 1064 nm Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-18 Yuxuan Luan, Jing Luo, Xiangzhong Liu, Lixin Xu, Peijun Yao
In order to realize broadband continuous wave (CW) mode locking by figure-9 fiber laser at 1064 nm, we propose an improved all-polarization-maintaining figure-9 cavity structure by adding gain fiber to both the loop and the linear arm in the laser. When the two sections of gain fiber are pumped simultaneously, the CW mode locking regime can be obtained. In this work, noise-like mode-locked pulses are
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Coupling multi-beam laser diode to multimode fiber by wedge prism combiner Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-17 Zhu Ma, Xiaoyan Sun, Shunshun Zhong, Lian Duan, Fan Zhang, Ji-an Duan
For high-power fiber-lasers, high power and high brightness have always been the goals pursued in the field of industry and defense. Based on the beam propagation principle, a novel lens combination of right-angle prisms and trapezoidal prisms is designed to realize the homogenized alignment of two rows of semiconductor laser array spots. The beam propagation and coupling efficiency of the system are
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Enhanced authentication technology based on deep neural network in the physical layer of optical communication Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-17 Xiangqing Wang, Hu Zhang, Lei Ren, Zihao Wu, Dongfei Wang, Xiaokun Yang
To solve the problem of device identity security management in Passive Optical Networks (PON), this study proposes an enhanced authentication technique based on Deep Neural Network (DNN) in the physical layer of optical communication. By negotiating the device power and transmission distance used with legitimate Optical Network Units (ONUs), the Optical Line Terminal (OLT) can obtain a unique channel
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Simultaneous generation of wavelength multiplexing and polarization multiplexing from a wavelength-tunable ultrafast fiber laser Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-16 Xinxin Jin, Ruiyan Liu, Jiayu Zhou, Zhihong Li, Yanmin Duan, Haiyong Zhu
A wavelength-tunable mode-locked erbium-doped all-fiber laser delivering both wavelength multiplexing and polarization multiplexing asynchronous pulses is experimentally demonstrated, which is challenging in previous studies. The numerical simulations validate the experimental observations and reveal that the cavity birefringence and polarization dependent loss (PDL) induced by the wavelength division
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A distributed photonic crystal fiber reverse design framework based on multi-source knowledge fusion Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-16 Sufen Ren, Shengchao Chen, Jiahao Wang, Haoyang Xu, Xuan Hou, Mengxing Huang, Jianxun Liu, Guanjun Wang
Recent advances in artificial intelligence (AI) have inspired researchers to explore machine learning (ML)-based optimization and reverse design techniques for photonic crystal fibers (PCFs). These studies often seek to improve model generalization, particularly for data that the model has not previously encountered. Traditional centralized training methods are challenging for devices with limited
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A third-order digital pre-distortion for PAM4 short-reach optical transport systems Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-15 Meng Yang, Aiying Yang, Peng Guo, Zhe Zhao, Tianjia Xu, Wenkai Wan
We propose and experimentally demonstrate a third-order digital pre-distortion (DPD) scheme to pre-compensate for the third-order nonlinear impairment introduced by the Mach–Zehnder modulator (MZM) in intensity modulation and direct detection (IMDD) optical transmission systems. In our DPD scheme, the modulator driving signal is pre-distorted by the third power of the signal. The coefficient is computed
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Advancing the measurement speed and accuracy of conventional BOTDA fiber sensor systems via SoC data acquisition Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-15 Abdulwahhab Essa Hamzah, Ahmad Ashrif A. Bakar, Mahmoud Muhanad Fadhel, Nurfarhana Mohamad Sapiee, Mohamed M. Elgaud, Mustafa Essa Hamzah, Ahmed Sabri Kadhim Almoosa, Nani Fadzlina Naim, Mohd Hadri Hafiz Mokhtar, Sawal Hamid Md Ali, Norhana Arsad, Mohd Saiful Dzulkefly Zan
Brillouin optical time-domain analysis (BOTDA) systems are widely used in distributed sensing applications and play a major role in modern monitoring systems. However, BOTDA system suffers manual frequency scanning, offline data acquisition and processing and signal synchronisation, which results in time consuming for measurement and complexity of the system. To overcome these limitations and improve
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Multi-fiber connector using a solid refractive-index-matching material formed on MT ferrule for ultra-multi-fiber connection Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-14 Yoshiteru Abe, Ryo Koyama, Chisato Fukai, Yukiko Sawano, Ikutaro Ogushi, Kazunori Katayama
To address the issues that will arise when designing and fabricating ultra-multi-fiber optical connectors in the future, a new multi-fiber connector is proposed. The multi-fiber push-on (MPO) connector achieves optical connection characteristics by pressing the obliquely polished ends of two mechanically transferable (MT) ferrules against each other via the pressing force of a spring. As the number
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Thermal-lens effect on transverse modes in the confined-gain Yb-doped fiber Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-13 Pengfei Liu, Jianqiu Cao, Wenguang Liu, Jinbao Chen
In this paper we studied thermal-lens effect on transverse modes in the confined-gain Yb-doped fiber for the first time, to the best of our knowledge. It is found that the thermal-lens effect is enhanced with the reduction of doped area due to the higher thermal density in the doped area. Then, the variations of three low-order transverse modes (i.e., fundamental, LP and LP modes) with the heat load
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Sub-10 ns mode-locked fiber lasers with multimode fiber saturable absorber Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-13 N. Li, M. Guo, W.Y. Zhang, Z.X. Guo, H. Li, X.W. Li, F. Yang
Sub-10 ns mode-locked fiber lasers with multimode fiber saturable absorber (SA) were demonstrated. The all fiber SA has a structure of single mode fiber -graded index multimode fiber - single mode fiber (SMF-GIMF-SMF). Inserting such SA in the designed long laser cavities with normal and anomalous dispersion, the mode locking nanosecond pulses were directly produced. In an anomalous dispersion cavity
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MAC-DBA based new cost-efficient architectures of network congestion-aware and survivable fiber-wireless and FTTx networks Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-10 Jitendra Gupta, Richa Bansal, Suman Kr. Dey, Aneek Adhya
In this paper, we propose two novel architectures for the short-reach optical access network (SR-OAN) and long-reach optical access network (LR-OAN) to provide high bandwidth and high connection availability to the users in wireless and fiber-to-the-x networks. The proposed architectures are referred to as network congestion alleviating architecture with partial protection (NCAA-PP) and network congestion
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An integrated Dual-Parameter sensor based on FBG for Temperature/Pressure monitoring of fluid pipeline Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-08 Siqi Zhu, Mingyao Liu, Han Song, Cong Li, Xueli Yang, Xiaochuan Chen
This article proposed an integrated temperature/pressure dual-parameter sensor in small hydraulic pipelines, and a set of small hydraulic pipeline experimental system is specially built to verify the dynamic measuring performance of it. A fiber Bragg grating (FBG) integrated sensing structure was designed and fabricated to achieve simultaneous monitoring of temperature and pressure. Specifically, the
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Magnetic field sensing via acoustic sensing fibers with submicron magnetostrictive cladding inclusions Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-08 Zach Dejneka, Daniel Homa, Joshua Buontempo, Gideon Crawford, Logan Theis, Anbo Wang, Gary Pickrell
Magnetic sensing optical fiber is a recently sought after technology able to withstand harsh environments, capable of distributive sensing, and readily adapted to different magnetic field strengths. A multi material optical fiber system utilizing magnetostrictive nanowires embedded in the fiber cladding was designed, tested, and characterized. The sensor takes advantage of fiber Bragg gratings and
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Simultaneous salinity and temperature measurement using multimode interference effect Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-06 Aoliang Li, Lei Dai, Shi Li, Yaxun Zhang, Elfed Lewis, Shunbin Wang, Pengfei Wang, Yu Yin
A multimode interference (MMI) sensor based on an SGNS structure (single mode fiber-graded index multimode fiber-tapered no core fiber-single mode fiber) for simultaneous measurement of salinity and temperature is described and experimental results presented. The tapered no core fiber (TNCF) and graded index multimode fiber (GIMF) promotes the existence of high-order modes, increasing sensitivity to
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A three-dimensional micro-deformation perception and reconstruction method for connecting rod based on FBG Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-06 Honggen Zhou, Yanling Fu, Qiulin Hou, Leyi Zhang, Mingzhen Luo, Guochao Li
As a key component of the ship power equipment, the deformation of the connecting rod directly affects its performance and life. Therefore, the deformation detection of the connecting rod plays an important role in ensuring the service life of the power equipment. In this paper, we propose a deformation perception and reconstruction method based on fiber Bragg grating (FBG) for the connecting rod of
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Pre-bent U-shaped optical microfiber embedded in multilayer PDMS film for large-scale bending measurement Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-02 Lingling Kan, Meng Wu, Hongwei Liang, Chunlei Jiang, Yang Zhang, Jingjing Wang
We propose a sensing film for large-scale bending measurements. Bi-conical microfiber was prepared using standard single-mode fiber and placed into pre-bent U-shape embedded with multilayer PDMS (polydimethylsiloxane) film, in which the effect of different ratios on the properties of PDMS was exploited. The shape of the microfiber placed and the structure of multilayer PDMS make the sensing film more
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Tunable all PM ring-cavity multi-Watt Tm-doped fiber laser module for 1890–2050 nm Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-02-02 Alexandre Amavigan, Clément Guyonnet, Wiktor Walasik, Robert E. Tench, Jean-Marc Delavaux, Thierry Robin, Benoit Cadier, Arnaud Laurent, Patrice Crochet, Yves Jaouen
We report the design, optical architecture, and performance of a packaged tunable all polarization-maintaining (PM) Thulium-doped fiber laser (TDFL) with a continuous tuning range of 1890–2050 nm. It consists of a ring-cavity tunable fiber laser source followed with a booster stage which yields output power >3 W and a linewidth of <0.05 nm (4 GHz). Measured performance in terms of output power (up
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Coupling efficiency of laser diode to multimode fiber by graded refractive index lens Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-30 Zhu Ma, Xiaoyan Sun, Yixiong Yan, Shunshun Zhong, Lian Duan, Fan Zhang, Ji'an Duan
For single emitter fiber coupling module, miniaturization and high stability have always been the goal in the field of industry and medical. Based on the beam propagation principle, a compact, flexible, and simple coupling optical system between laser diode (LD) and multimode fiber (MMF) by graded refractive index (GRIN) lens is proposed, which shows a coupling structure with relatively loose optical
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Improving the cutting process and quality of thick plates with high-power fiber laser Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-26 Yanjie Liu, Shijin Zhang
Fiber laser cutting technology has been widely used in sheet metal processing because of its unique advantages. However, quality problems such as dross and rough edges of the bottom kerf caused by low material removal rate (MRR) have limited this technology's further application and expansion. In this work, the material removal mechanism of laser cutting of thick mild steel is first investigated, focusing
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Investigation of a hybrid FBG sensing system for multi-parameters detection Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-28 Yi-Lin Yu, Ming-Huei Huang, Yong-Ji Chen, Chun-Yao Teng, Yu-Lin Wang, Hiroki Kishikawa, Kimio Oguchi
In this article, we introduce a multi-parameter fiber sensor system that utilizes a hybrid FBG design. The design combines a fused silica fiber Bragg grating and a fiber Bragg grating based on a silicon core fiber. This combination enables the sensor to detect surrounding temperature, water level, and refractive index. The sensor successfully measured temperature within the range of 10 to 40 °C, water
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Bending sensor with enhanced sensitivity via parallel dual-fiber Fabry-Perot cavities Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-28 Ce Bian, Chong Song, Yong Huang, Ming Li, Dongsen Cui, Tingting Gang
In this work, a method to enhance the sensitivity of bending measurement by using parallel dual-fiber Fabry-Perot (F-P) cavity structure is proposed. The sensor consists of two standard single-mode fibers (SMF) and a large diameter fiber (LDF) with a diameter of 150 μm. The experimental results show that the sensor can respond to bending in different directions due to the direction recognition ability
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Frequency offset and phase noise-tolerant coherent PON with fast convergence for upstream Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-26 Lin Zhang, Gang Liu, Xingang Huang, Yixiao Zhu
Coherent optics are considered a promising solution for 100G passive optical network (PON) and beyond. Both simplified structure and efficient preamble are desired for the cost-sensitive scenario and upstream burst mode detection. In this work, we experimentally demonstrate a phase-insensitive coherent PON. An optical carrier is added by the modulator bias as an offset in signal constellation to eliminate
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Low pressure pipeline leak localization using highly sensitive rubber-based diaphragm FBG pressure sensors and NPW method Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-26 E. Vorathin, M.X. Choong, M. Mohammad, A.R. Othman, A.R. Ismail
Leak localization performance between rubber-based diaphragm fibre Bragg grating (FBG) pressure sensors and aluminium-based diaphragm FBG pressure sensors were compared and studied. A total of two aluminium-based and two rubber-based diaphragm FBG pressure sensors were fitted on a pipe with various leak points and sizes. Calibration test results showed that rubber-based diaphragm FBG pressure sensors
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Gain-switched 2 µm fiber laser pumped by a Q-switching and mode-locking self-pulsing Er-doped fiber laser Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-23 Xiaoran Ma, Weiwei Huang, Shengzhi Zhao, Yizhou Liu, Chun Wang, Mingqi Fan, Jingcheng Shang, Ping Hu, Jiajia Mao, Kejian Yang, Tao Li, Yang Li, Tianli Feng
This paper reports on the first gain-switched fiber laser in the 2 μm region that uses an adjustable self-pulsing Er-doped QML fiber laser as a pumping source. By adjusting the output of the self-pulsing laser, a stable gain-switched pulse with a minimum duration of 366.2 ns and an adjustable repetition frequency of 37–73 kHz at 1959 nm is generated. The maximum output power achieved is 26.5 mW, with
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High resolution, quasi-temperature-insensitive magnetic field sensor based on hybrid fiber interferometer Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-22 Xiaojun Tang, Jian Xu, Tianli Hui, Lixia Liu, Ning Ma, Liang Xin, Tigang Ning
This paper proposed and experimentally demonstrated a high resolution and quasi-temperature-insensitive magnetic field sensor based on hybrid interferometer. The sensor is created by cascading a Mach Zehnder interferometer (MZI) and a Sagnac loop interferometer (SI). Due to the symmetry of the MZI’s two arms, the length change induced by thermal expansion is approximate identical, meaning the temperature
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Study on the mechanism of fiber-optic hot-wire sensing based on DFB-FL thermally induced chirp effect Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-20 Yu Zhuang, Xiaolei Zhang, Yumeng Hong, Ying Shang, Jiasheng Ni, Zhiqiang Song
In this paper, we propose an intensity demodulated fiber-optic hot-wire sensing method based on the thermally induced chirp effect of distributed feedback fiber lasers. The cobalt-doped fiber is fused at the rear end of the erbium-doped distributed feedback fiber laser to constitute a hot fiber wire with a gradient temperature distribution. The cobalt-doped fiber is heated up under the excitation of
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A model-free method based on RDPG for fiber diameter steady control Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-20 Yang Cao, Jiawei Zhang, Yunsheng Qian, Yanan Wang, Yizheng Lang, Honggang Wang
Optical fibers have made outstanding contributions to optical instruments such as micro-channel plates (MCPs) and micro-pore optics (MPOs). As the stricter performance requirements for the MCP and MPO, traditional diameter control methods are incapable. Additionally, the partial observation issue of fiber drawing process further limits the outcome of the existing control approaches. Innovative control
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Various static loading condition monitoring of carbon fiber composite cylinder with integrated optical fiber sensors Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-20 Xiaoxi Qu, Jianle Li, Yinan Shan, Zhengyan Yang, Lei Yang, Hao Xu, Minjing Liu, Zhanjun Wu, Shiyuan Zhao
Composite cylinder structures are widely used in various engineering fields. Monitoring the health state is an essential method for ensuring the safe operation of the structures. Embedded distributed fiber optic sensors have gained significant interest as they effectively address issues related to aesthetics and protection. This paper presents a strain monitoring method that involves embedding optical
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Optimizing performance in elastic optical networks using advanced reconfigurable optical add-drop multiplexers: A novel design approach and comprehensive analysis Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-19 Faranak Khosravi, Mehdi Shadaram
Network operators diversify service offerings and enhance network efficiency by leveraging bandwidth-variable transceivers and colorless flexible-grid reconfigurable optical add-drop multiplexers (ROADMs). Nonetheless, the paradigm shift from rigid to elastic optical networks (EONs) has affected several key parameters, including bit rate, center frequency spacing, modulation format, and optical reach
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Q-switched Er-doped fiber laser using an aqueous solution of gold nanorods and polyvinyl alcohol Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-17 , Gautam Das
Authors reported the generation of Q - Switched pulses in an erbium-ytterbium co-doped fiber laser using an aqueous solution of colloidal gold nanorods (GNRs) and Polyvinyl Alcohol (PVA) as a saturable absorber (SA). The effect of the GNRs and PVA concentrations on the pulses has been explored. Passive Q-Switching is achieved at 1.1 W (1.8 A). Pulses with a minimum width of 9.6 µs having a repetition
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Blocking triggered multi-path routing with spectrum retuning in elastic optical networks Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-18 , Athul M. Srinivas, Rajkishor Kumar, Prashanth Barla
Spectrum fragmentation has a substantial impact on spectrum utilization, which lowers blocking performance in elastic optical networks (EONs). In this paper, we investigate the spectrum status when a connection request cannot be served via single-path routing and propose a spectrum retuning approach with multi-path routing to address spectrum fragmentation, thus mitigating blocking concerns in EONs
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Fiber Bragg grating based hot-wire anemometer with enhanced sensitivity by fiber surface frosting Opt. Fiber Technol. (IF 2.7) Pub Date : 2024-01-18 Yuhan Tang, Jing Yang, Jiarui Zhang, Dajuan Lv, Liangming Xiong, Jun Yang, Xinyong Dong
Sensitivity enhancement of a fiber Bragg grating (FBG)-based hot-wire anemometer is achieved by using a surface-frosted and silver-coated FBG. The FBG is heated into a hot wire by using a 1480 nm laser through core-to-cladding mode coupling by a core-offset fiber splice and light-to-heat conversion by the coated silver film. Temperature and hence Bragg wavelength of the FBG are changed with airflow