Article
Engineering, Multidisciplinary
Jun Zhao, Hushan Wang, Xiaohan Sun
Summary: The novel fiber temperature sensor offers higher accuracy and resolution, better integration and reliability, suitable for precise temperature measurement in high voltage and strong magnetic field environments.
Article
Engineering, Electrical & Electronic
Chen Jiang, Yunqi Liu, Chengbo Mou
Summary: An optical fiber vector curvature sensor based on a long-period fiber grating (LPFG) inscribed in Panda-type polarization-maintaining fiber (PMF) using CO2-laser heating and tapering system is proposed and demonstrated. PMF-LPFGs with grating period ranging from 350 to 490 μm have been experimentally fabricated. The sensor shows potential for vector curvature sensing with maximum curvature sensitivities of 9.26 nm/m(-1) and -6.89 nm/m(-1) for the fast and slow axis LP15 modes, respectively, and capability for 2-dimensional bending direction recognition.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Alicja Anuszkiewicz, Monika Bouet, Grzegorz Stepniewski, Rafal Kasztelanic, Adam Filipkowski, Dariusz Pysz, Andy Cassez, Arnaud Mussot, Ryszard Buczynski, Geraud Bouwmans, Tomasz Osuch
Summary: This paper presents the first fiber Bragg grating (FBG) inscribed in a polarization maintaining (PM) optical fiber with an artificially anisotropic core achieved by distributing discrete germanium-doped areas in nanoscale. The FBG has unique properties, similar to those of a grating in a cylindrically symmetrical optical fiber, despite being written in a fiber that preserves the orthogonal polarization components of the mode. The FBG is insensitive to the excited polarization state and twist due to the relatively low birefringence of the fiber, making it suitable for all-fiber lasers, polarization fiber sensors, and components with spectral insensitivity to twist.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Instruments & Instrumentation
Ying Guo, Fengping Yan, Ting Feng, Qi Qin, Dan Cheng, Biao Guan, Ting Li, Chenhao Yu, Hong Zhou, Kazuo Kumamoto, Yuping Suo
Summary: This paper proposes and experimentally demonstrates a switchable multi-wavelength thulium-doped fiber laser with a high optical signal-to-noise ratio and stability. By utilizing a superimposed polarization-maintaining fiber Bragg grating as a narrow bandwidth filter and introducing polarization hole burning technology, the laser is able to select and achieve stable output of different wavelengths in the 2-mu m band.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Optics
Chunhua Wang, Ruijuan Gao, Nian Fang, Xiang Gu, Keshuai Wu, Liang Chen, Xiaoyi Bao
Summary: This paper investigates the orthogonal polarization clamping behavior of a random Brillouin fiber laser (RBFL) using polarization maintaining fiber (PMF). The research demonstrates the clamping of the state of polarization of lasing light from the RBFL to one of the two principal axes of PMFs under certain conditions. Additionally, an orthogonal polarization interleaving multi-wavelength (OPIMW) RBFL is also demonstrated based on this polarization clamping manipulation.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Ying Li, Yunqi Liu, Huixin Shen, Chen Jiang, Chengcheng Xu, Chengbo Mou
Summary: An optical fiber current sensor based on a helical long-period fiber grating inscribed in a polarization-maintaining fiber by CO2 laser is proposed. The sensor measures the applied current by monitoring the rotation angle of the input elliptical polarized light, showing good linear relationship between rotation angle and current with high sensitivity.
OPTICS COMMUNICATIONS
(2021)
Review
Engineering, Electrical & Electronic
Hongying Zhang, Yongkang Dong
Summary: Brillouin dynamic gratings (BDGs) in optical fibers have been developed for over a decade and have gained significant interest in various photonics fields. Due to their flexibility and all-optical generation, BDGs have been explored for applications such as distributed optical fiber sensing, all-optical signal processing, all-optical delay, microwave photonic filter, and ultrahigh resolution optical spectrometry. Recently, the transverse BDG associated with forward stimulated Brillouin scattering (SBS) has been proposed for substance identification and characterization of optical fiber diameter. This paper provides a systematic theoretical analysis of BDGs in optical fibers and summarizes their recent advances in applications.
PROGRESS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Haiyang Wang, Zichao Zhou, Liang Chen, Xiaoyi Bao
Summary: The study experimentally characterizes the acoustic wave coupling in a dual-wavelength orthogonal polarized Brillouin random fiber laser based on polarization-maintaining fiber. The investigation reveals the dynamics of intensity and frequency of the dual-wavelength laser and single-wavelength laser, as well as the correlation peaks in the Pearson's correlation coefficient spectrum. The study also explores the lower laser frequency drift, larger relative intensity fluctuation, and replica symmetry breaking observed in the dual-wavelength Brillouin random lasing process.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Cailing Fu, Pengfei Li, Zhiyong Bai, Yiping Wang
Summary: A high-quality helical long period fiber grating (HLPFG) was successfully demonstrated in elliptical core polarization-maintaining fiber (PMF) using hydrogen-oxygen flame heating technique. The single HLPFG with a length of 6.5 mm could generate orbital angular momentum (OAM) modes. The success in generating OAM(+/- 2) mode is attributed to the two-fold symmetry of the elliptical core PMF in the cross-section.
Article
Optics
Haiyang Wang, Chen Chen, Ping Lu, Stephen Mihailov, Liang Chen, Xiaoyi Bao
Summary: In this study, a polarization-maintaining random fiber grating ring (PM-RFGR) resonator is proposed and demonstrated for achieving high-precision frequency stabilization. By integrating the RFGR resonator with a random fiber laser, longitudinal modes are suppressed and mode-hopping-free operation is achieved. Experimental results show that small frequency drift can be achieved and an all optical locking mechanism is provided.
Article
Engineering, Electrical & Electronic
Jae Hyeong Youn, Kwang Yong Song
Summary: Improved spatial resolution in distributed analysis of Brillouin dynamic grating (BDG) in a polarization-maintaining fiber (PMF) is achieved by utilizing a differential measurement (DM) scheme and a matched RF low-pass filter. The DM eliminates reflection signals from uncorrelated positions, while the optimized RF low pass filter suppresses remaining high-frequency common noise in the BDG spectrum. Experimental results confirm a distribution of BDG spectra in a 1 km PMF with a spatial resolution of 5 cm, matching the nominal resolution determined by the synthesis of optical coherence function in the correlation-domain analysis system.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Haoyu Li, Xuyou Li, Dan Xu, Jie Wang, Hanrui Yang
Summary: In this paper, an interferometric fiber optic gyroscope (IFOG) composed of an optimized elliptical-core Panda polarization-maintaining fiber (PMF) is proposed and experimentally demonstrated based on a comprehensive analysis of the design principle of PMFs for IFOGs. The improvement mechanism of the geometric birefringence on the performance of the Panda PMF was analyzed, and the optimized structural parameters were selected for fiber fabrication. Experimental results showed a significant improvement in temperature stability with an achieved angle random walk performance of 0.001723 degrees /vh compared to the traditional IFOG.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Hongze Gao, Zicheng Wang, Guochen Wang, Wei Gao, She Li, Zhuo Wang, Bo Cheng, Kaidi Tian
Summary: The study of chiral fibers for optical fiber communication and sensing is important due to the lack of cross coupling effects in circularly polarized light. However, the fabrication requirements for chiral fibers result in higher costs. In this research, the authors successfully demonstrated the fabrication method of dielectric chiral fiber and showcased its low-cost and high-performance characteristics.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Huiwen Niu, Wenhuan Chen, Yue Liu, Xiren Jin, Xiang Li, Feng Peng, Tao Geng, Shuo Zhang, Weimin Sun
Summary: A novel embedded ultra-long period fiber grating (EULPFG) based on a graded index multimode fiber (GI-MMF) is proposed for temperature measurement, showing high temperature sensitivity while being insensitive to refractive index, strain, and bending. It is expected to be used in ocean monitoring systems for measuring seawater temperature with minimal interference from other parameters.
Article
Engineering, Electrical & Electronic
Yong Hyun Kim, Kwang Yong Song
Summary: The experimental analysis focused on the spatial mode structure in a PANDA-type few-mode fiber (PANDA-FMF) and the impact of different factors, such as intermodal operation of Brillouin dynamic grating (BDG) and core ellipticity. New polarization-maintaining mode selective couplers were developed to selectively launch various optical modes for pump and probe waves. It was found that the LP11 modes in PANDA-FMF exhibit a unique hierarchy in effective refractive index (ERI) related to lobe orientations and polarization directions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Zichao Zhou, Liang Chen, Xiaoyi Bao
Summary: In this study, a high-efficiency Brillouin random fiber laser enabled by a random fiber grating with demonstration of replica symmetry breaking is reported. The random fiber grating was characterized by optical coherence tomography, showing multiple narrow linewidth peaks in the reflection spectrum. The use of scattering from the random fiber grating as disordered feedback resulted in improved laser performance with reduced noise and increased coherence.
Review
Chemistry, Analytical
Stephen J. Mihailov, Cyril Hnatovsky, Nurmemet Abdukerim, Robert B. Walker, Ping Lu, Yanping Xu, Xiaoyi Bao, Huimin Ding, Manny De Silva, David Coulas, Dan Grobnic
Summary: Recent progress in the use of infrared femtosecond lasers for fabricating optical fiber sensors, such as fiber Bragg gratings and random fiber gratings, has enabled advancements in through-the-coating fabrication of Bragg gratings in ultra-thin fiber filaments and novel applications in distributed temperature sensing and fiber laser sensors.
Article
Optics
Zichao Zhou, Haiyang Wang, Yuan Wang, Liang Chen, Xiaoyi Bao
Summary: This study investigates the interaction between random lasers and gain medium by characterizing the time-resolved distributed acoustic wave generated by a Brillouin random fiber laser (BRFL) using optical time domain reflectometry. The results show the dynamic properties of the acoustic wave, reflecting the gain dynamics of the BRFL. The distributed characterization methods utilized in this paper offer a new perspective to understand the fundamental physics of the random lasing process and its noise property.
PHOTONICS RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Huibo Fan, Liang Chen, Xiaoyi Bao
Summary: A tension-compression strain sensor has been developed with high strain sensitivity, large strain range, low temperature, and polarization crosstalk, utilizing an asymmetric off-core microsphere-waveguide structure. The sensor achieves improved performance by reducing interference from high-order modes and enhancing strain sensitivity, with increased strain range for tension and compression.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Benoit Vanus, Chams Baker, Liang Chen, Xiaoyi Bao
Summary: The novel stabilization-magnification (SM) sensing scheme utilizes intensity modulation and self-phase modulation to enhance the sensitivity of fiber optic sensors to environmental perturbations. Experimental results demonstrate a 3.93-fold improvement in minimum detectable strain values.
Article
Optics
Huibo Fan, Hongwei Fan, Cong Lu, Qiming Yin, Xiaoyi Bao
Summary: This study proposes a U-shape core-offset fiber sensor with four fiber segments for large strain sensing. The sensor utilizes a spring-like microstructure fiber with a large transverse bending radius to achieve continuous strain detection. The sensor has high sensitivity and a large strain range, enabling both compression and tension measurement.
Article
Acoustics
Liam Kelly, Pierre Berini, Xiaoyi Bao
Summary: This article proposes a novel method for analyzing acoustic Fabry-Perot spectra to determine the key characteristics of surface acoustic wave (SAW) waves and cavities. The method provides an intuitive approach for determining the free surface velocity, attenuation, and reflection of IDTs, which are crucial design parameters. The experimental results validate the effectiveness of the proposed method.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Engineering, Electrical & Electronic
Haiyang Wang, Zichao Zhou, Liang Chen, Xiaoyi Bao
Summary: The study experimentally characterizes the acoustic wave coupling in a dual-wavelength orthogonal polarized Brillouin random fiber laser based on polarization-maintaining fiber. The investigation reveals the dynamics of intensity and frequency of the dual-wavelength laser and single-wavelength laser, as well as the correlation peaks in the Pearson's correlation coefficient spectrum. The study also explores the lower laser frequency drift, larger relative intensity fluctuation, and replica symmetry breaking observed in the dual-wavelength Brillouin random lasing process.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Liam Kelly, Howard Northfield, Sabaa Rashid, Xiaoyi Bao, Pierre Berini
Summary: A new tri-layer lift-off photolithography technique is proposed for the fabrication of high frequency SAW devices, utilizing a BARC layer to improve resolution over traditional techniques. The technique enables reliable fabrication and excellent agreement with numerical results.
MICROELECTRONIC ENGINEERING
(2022)
Article
Optics
Haiyang Wang, Chams Baker, Liam Kelly, Pedro Tovar, Liang Chen, Xiaoyi Bao
Summary: This paper proposes highly sensitive broadband ultrasound sensors based on fused dual-core chalcogenide-polymethyl methacrylate (As2Se3-PMMA) microfibers. The ultrasound response is determined by the differential slope of the transmission spectra in the dual-core microfiber, and the sensing of ultrasound waves with and without an aluminum plate is demonstrated. A broadband frequency range and high signal-to-noise ratio (SNR) are achieved in the compact fused dual-core As2Se3-PMMA microfiber ultrasound sensor.
Article
Optics
Liang Zhang, Zenghuan Qiu, Zhelan Xiao, Jilin Zhang, Fufei Pang, Tingyun Wang, Xiaoyi Bao
Summary: This paper proposes and demonstrates, for the first time, a frequency-stabilized Brillouin random fiber laser realized by a self-inscribed transient population grating. The grating is formed by the redistribution of population in erbium-doped fibers through bidirectionally injected phonon-controlled random laser beams. The long-lifetime metastable ion states in the fibers prolong the time dynamics of a stimulated Brillouin scattering laser, suppressing significant random modes and establishing one dominating lasing mode with milliseconds of lifetime through the competition of numerous random modes.
Article
Optics
Chunhua Wang, Ruijuan Gao, Nian Fang, Xiang Gu, Keshuai Wu, Liang Chen, Xiaoyi Bao
Summary: This paper investigates the orthogonal polarization clamping behavior of a random Brillouin fiber laser (RBFL) using polarization maintaining fiber (PMF). The research demonstrates the clamping of the state of polarization of lasing light from the RBFL to one of the two principal axes of PMFs under certain conditions. Additionally, an orthogonal polarization interleaving multi-wavelength (OPIMW) RBFL is also demonstrated based on this polarization clamping manipulation.
OPTICS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Liam Kelly, Chen Chen, Xiaoyi Bao, Pierre Berini
Summary: A two-port surface acoustic wave (SAW) strain sensor based on measuring acoustic Fabry-Perot resonance peaks is demonstrated. The frequency sensitivity to strain of the cavity resonances was analyzed and a maximum frequency stability cavity length was determined. Cross-correlation analysis was introduced to improve the detection of SAW resonance frequency shifts. The sensor showed high frequency sensitivity and a low minimum strain resolution.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Review
Chemistry, Analytical
Shaonian Ma, Yanping Xu, Yuxi Pang, Xian Zhao, Yongfu Li, Zengguang Qin, Zhaojun Liu, Ping Lu, Xiaoyi Bao
Summary: This paper reviews the importance and advantages of fiber-optic high-temperature sensors in various industries. It also introduces the recent progress in transitioning from glass to crystal fiber sensing solutions and discusses the future prospects and challenges.
Proceedings Paper
Engineering, Electrical & Electronic
Ping Lu, Stephen J. Mihailov, Yanping Xu, Xiaoyi Bao
Summary: This study demonstrates the use of fs-IR laser to create random grating structures in optical fibers for applications in fiber sensors and fiber lasers. The plane-by-plane method is employed to inscribe various gratings. Experimental results over the past 5 years show the potential of fiber random gratings in distributed temperature measurements, fiber lasers, and fiber laser sensors. Additionally, the discussion highlights the potential applications of fs-IR laser processed optical fibers in structure health monitoring, harsh environment sensing, perimeter intrusion detection, and encrypted communication.
FIBER OPTIC SENSORS AND APPLICATIONS XVII
(2021)
