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Recent progress of in‑fber WGM microsphere resonator

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Frontiers of Optoelectronics 2023年第2期16卷 25-62页

作者： Yong Yang Zijie wang Xiaobei Zhang Qi Zhang tingyun wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China

In-fber whispering gallery mode(WGM)microsphere resonators have received remarkable attention due to the superiorities of compact structure,high stability and self-alignment.As an in-fber structure,WGM microsphere resonators have been demonstrated in various applications,such as sensors,flters and lasers,which have signifcant impacts on modern optics.Herein,we review recent progress of in-fber WGM microsphere resonators,which involve fbers of diverse structures and microspheres of diferent materials.First,a brief introduction is given to in-fber WGM microsphere resonators,from structures to applications.Then,we focus on recent progresses in this feld,including in-fber couplers based on conventional fbers,capillaries and micro-structure hollow fbers,and passive/active microspheres.Finally,future developments of the in-fber WGM microsphere resonators are envisioned.

关键词： Whispering gallery mode Microsphere resonator In-fber device Sensor

Broadband Acoustic Vibration Sensor Based on Cladding-Mode Resonance of Double-Cladding Fiber

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Photonic Sensors 2019年第3期9卷 230-238页

作者： Guanghui SUI Huanhuan LIU Fufei PANG Jiajing CHENG tingyun wang Changcheng Institute of Metrology & Measurement Beijing 100095 China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai 200444 China

We have proposed and demonstrated a double-cladding fiber (DCF) with cladding?mode resonance property for broadband acoustic vibration sensing. Since the fundamental mode in the core waveguide is able to be coupled to LP05 mode in the tube waveguide once the phase-matching condition is fulfilled, the transmission spectrum can exhibit a dip with a large extinction ratio. An acoustic vibration could induce the wavelength shift of such transmission spectrum, so that the intensity variation at a wavelength near the dip is coded with the information of the acoustic vibration signal. By demodulating the response of intensity variation, the frequency of the applied acoustic vibration signal can be recovered. Such a DCF-based sensor with an intensity modulation could measure the acoustic vibration with a broadband frequency range from 1 Hz to 400 kHz and exhibits the maximum signal-to-noise ratio (SNR) of ?80.79 dB when the vibration frequency is 20 kHz. The obtained results show that the proposed DCF-based acoustic vibration sensor has a potential application in environmental assessment, structural damage detection, and health monitoring.

关键词： Double-cladding fiber acoustic vibration sensor coaxial coupler

Spectrally Flat Supercontinuum Generation in a ZBLAN Fiber Pumped by Erbium-Doped Mode-Locked Fiber Laser

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Photonic Sensors 2019年第4期9卷 302-308页

作者： Huanhuan LIU Ye YU Wei SONG Qiao JIANG Fufei PANG tingyun wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China

We have experimentally demonstrated the flat supercontinuum(SC)generation using a 10-m-long ZrF4-BaF2-LaF3-AlF3-NaF(ZBLAN)fluoride fiber pumped by an erbium-doped mode-locked fiber laser incorporating carbon-nanotube-based saturable absorbers.In order to improve the spectral flatness of SC,the standardized single-mode fiber with different lengths is connected to the output of the mode-locked fiber laser before the pulse amplification.The generated SC with ZBLAN fiber exhibits the best spectral flatness with fluctuation less than 1.29 dB over the wavelength of 1571.8 nm−1803.1 nm,showing potential applications in optical sensing.

关键词： Flat supercontinuum ZBLAN mode-locked fiber laser

Carbon-coated magnetic particles increase tissue temperatures after laser irradiation

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Journal of Innovative Optical Health Sciences 2015年第5期8卷 50-55页

作者： Shupeng Liu Na Chen Fufei Pang Zhengyi Chen tingyun wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University 149 Yanchang Road Shanghai 200072P.R.China Institute of Biomedical Engineering Shanghai University 149 Yanchang RoadShanghai 200072P.R.China

Purpose:This work focused on the investigation the hyperthermia performance of the carboncoated magnetic particles(CCMPs)in laser-induced hyperthermia.Materials and methods:We prepared CCMPs using the organic carbonization method,and then characterized them with transmission electron microscopy(TEM),ultraviolet-visible(UV-Vis)spectrophotometry,vibrating sample magnetometer(VSM)and X-ray di®raction(XRD).In order to evaluate their performance in hyperthermia,the CCMPs were tested in laser-induced thermal therapy(LITT)experiments,in which we employed a fully distributedfiber Bragg grating(FBG)sensor to profile the tissue's dynamic temperature change under laser irradiation in real time.Results:The sizes of prepared CCMPs were about several micrometers,and the LITT results show that the tissue injected with the CCMPs absorbed more laser energy,and its temperature increased faster than the contrast tissue without CCMPs.Conclusions:The CCMPs may be of great help in hyperthermia applications.

关键词： Carbon-coated magnetic particles hyperthermia laser

Black Phosphorus-Film With Drop-Casting Method for High-Energy Pulse Generation From Q-Switched Er-Doped Fiber Laser

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Photonic Sensors 2019年第3期9卷 239-245页

作者： Huanhuan LIU Wei SONG Ye YU Qiao JIANG Fufei PANG tingyun wang Shanghai University

We have reported high-energy pulse generation from a Q-switched Er-doped fiber laser based on black phosphorus (BP) with a drop-casting method. Poly dimethyl diallyl ammonium (PDDA) is employed to protect BP. A passive Q-switching operation is achieved by using the BP/polyvinyl alcohol (PVA) film as the saturable absorbers (SAs). When the pump power increases from 130.4mW to 378mW, the repetition rate increases from 13.33kHz to 26.6kHz, and the pulse duration decreases from 10.67p,s to 7.11 (is. The maximum pulse energy is 468.03 nJ, to the best of our knowledge, which is the highest pulse energy produced from Q-switched fiber laser based on BP-SA at 1.5 pm. The obtained high-energy pulse demonstrates that BP/PVA film fabricated by such a drop-casting method can provide an ideal SA for high pulse energy generation from fiber lasers, and it has a potential application of remote sensing.

关键词： Fiber laser Q-switched black phosphorus

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调制光栅Y分支型激光器高效调谐特性研究

中国激光 2024年第2期51卷 1-9页

作者：黄怿尤越张浩森邓传鲁胡程勇汪立森张小贝王廷云上海大学特种光纤与光接入网重点实验室上海200444

针对调制光栅Y分支型(MG-Y)激光器在实际应用中波长-电流查找表(LUT)构建效率低、调谐方式复杂、波长调谐时功率漂移量大等问题,对其调谐特性进行了深入研究。利用左、右反射器电流的调谐特性,设计出一种具有普适性的波长测试框架,能够... 详细信息

针对调制光栅Y分支型(MG-Y)激光器在实际应用中波长-电流查找表(LUT)构建效率低、调谐方式复杂、波长调谐时功率漂移量大等问题,对其调谐特性进行了深入研究。利用左、右反射器电流的调谐特性,设计出一种具有普适性的波长测试框架,能够高效且准确地定位激光器的平滑波长调谐路径。同时提出一种自适应功率校准算法,提升了激光器在波长调谐时的功率稳定性。测试结果表明:基于波长测试框架的LUT仅包含3147个反射器电流-波长组合;激光器的波长调谐范围为1528~1568 nm,波长调谐步长为5 pm;边模抑制比(SMSR)大于40 dB;波长准确度优于±2.9 pm;波长重复性优于1.9 pm;波长调谐时功率漂移量小于0.408 mW,稳定度为3.57%;解调出光纤非本征法布里-珀罗干涉型(EFPI)传感器的腔长变化量小于7.58 nm,可以应用于光纤传感等实际场景。

关键词：激光器半导体激光器波长调谐功率校准光纤传感

Theoretical aspects and sensing demonstrations of cone-shaped inwall capillary-based microsphere resonators

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Photonics Research 2017年第5期5卷 507-511页

作者： XIAOBEI ZHANG YONG YANG HUAWEN BAI JIAWEI wang MING YAN HAI XIAO tingyun wang Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai Institute for Advanced Communication and Data ScienceSchool of Communication and Information Engineering Shanghai University Department of Electrical and Computer Engineering Clemson University

In this paper, a detailed theoretical study on the characteristics of cone-shaped inwall capillary-based microsphere resonators is described and demonstrated for sensing applications. The maximum, minimum, slope, contrast, and width of the Fano resonance are analyzed. As the transmission coefficient of the capillary resonator increases, the absolute value of the slope of Fano resonances increases to reach its maximum, which is useful for sensors with an ultra-high sensitivity. There occurs another phenomenon of electromagnetically induced transparency when the reflectivity at the capillary–environment interface is close to 100%. We also experimentally demonstrated its capability for temperature and refractive index sensing, with a sensitivity of 10.9 pm∕°C and 431 d B∕RIU basedon the Fano resonance and the Lorentzian line shape, respectively.

关键词： In Theoretical aspects and sensing demonstrations of cone-shaped inwall capillary-based microsphere resonators As

Two-photon 3D printed spring-based Fabry-Pérot cavity resonator for acoustic wave detection and imaging

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Photonics Research 2023年第5期11卷 780-786页

作者： HEMING WEI ZHANGLI WU KEXUAN SUN HAIYAN ZHANG CHEN wang KEMIN wang TIAN YANG FUFEI PANG XIAOBEI ZHANG tingyun wang SRIDHAR KRISHNASWAMY Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai UniversityShanghai 200444China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Optical Communication Systems and Networks Key Laboratory for Thin Film and Microfabrication of the Ministry of EducationSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Center for Smart Structures and Materials Northwestern UniversityEvanstonIllinois 60208USA

Optical fiber microresonators have attracted considerable interest for acoustic detection because of their compact size and high optical quality.Here,we have proposed,designed,and fabricated a spring-based Fabry-Pérot cavity microresonator for highly sensitive acoustic detection.We observed two resonator vibration modes:one relating to the spring vibration state and the other determined by the point-clamped circular plate vibration mode.We found that the vibration modes can be coupled and optimized by changing the structure size.The proposed resonator is directly 3D printed on an optical fiber tip through two-photon polymerization and is used for acoustic detection and imaging.The experiments show that the device exhibits a high sensitivity and low noise equivalent acoustic signal level of 2.39 mPa∕Hz^(1∕2)at 75 kHz that can detect weak acoustic waves,which can be used for underwater object imaging.The results demonstrate that the proposed work has great potential in acoustic detection and biomedical imaging applications.

关键词： resonator fiber cavity

Distributed Vibration Sensor With Laser Phase-Noise Immunity by Phase-Extraction φ-OTDR

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Photonic Sensors 2019年第3期9卷 223-229页

作者： Yuying SHAO Huanhuan LIU Peng PENG Fufei PANG Guoqin YU Zhen CHEN Na CHEN tingyun wang State Grid Shanghai Municipal Electric Power Company Shanghai 200072 China Key laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai 200444 China

We have demonstrated a distributed vibration sensor based on phase-sensitive optical time-domain reflectometer (φ-OTDR) system exhibiting immunity to the laser phase noise. Two laser sources with different linewidth and phase noise levels are used in the φ-OTDR system, respectively. Based on the phase noise power spectrum density of both lasers, the laser phase is almost unchanged during an extremely short period of time, hence, the impact of phase noise can be suppressed effectively through phase difference between the Rayleigh scattered light from two adjacent sections of the fiber which define the gauge length. Based on the phase difference method, the external vibration can be located accurately at 41.01 km by the(φ-OTDR system incorporating these two lasers. Meanwhile, the average signal-to-noise ratio (SNR) of the retrieved vibration signal by using Laser I is found to be -37.7 dB, which is comparable to that of -37.5 dB by using Laser II although the linewidth and the phase noise level of the two lasers are distinct. The obtained results indicate that the phase difference method can enhance the performance of(φ-OTDR system with laser phase-noise immunity for distributed vibration sensing, showing potential application in oil-gas pipeline monitoring, perimeter security, and other fields.

关键词： Distributed vibration sensing optical time domain reflectometer fiber sensor phase noise