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Experimental Study on Dual-Wavelength Distributed Feedback fiber Laser

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Photonic Sensors 2014年第3期4卷 225-229页

作者： Haifeng QI Zhiqiang SONG Jian GUO Chang WANG Jun CHANG Gangding PENG shandong key laboratory of optical fiber sensing technologies Laser Institute of Shandong Academy of SciencesJinan 250014 China

Four distributed feedback fiber lasers with dual-wavelength operations were studied experimentally in detail. The laser characteristics of these distributed feedback fiber lasers （DFB-FLs） were investigated. The operation conditions for the dual-wavelength output are analyzed and presented. Through this study, the guidance of the design and fabrication of some dual-wavelength distributed feedback fiber lasers are provided.

关键词： Distributed feedback fiber laser dual wavelength phase shift optical fiber sensing

Research on a New fiber-Optic Axial Pressure Sensor of Transformer Winding Based on fiber Bragg Grating

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Photonic Sensors 2017年第4期7卷 365-371页

作者： Yuan LIU Lianqing LI Lin ZHAO Jiqiang WANG Tongyu LIU shandong Provincial key laboratory of optical fiber sensing technologies Laser Institute of Shandong Academy ofSciences Jinan 250014 China

Based on the principle of the fiber Bragg grating, a new type of fiber-optic pressure sensor for axial force measurement of transformer winding is designed, which is designed with the structure of bending plate beam, the optimization of the packaging process, and material of the sensor. Through the calibration experiment to calibrate the sensor, the field test results of the Taikai transformer factory show that the sensitivity of the sensor is 0.133 pm/kPa and the repeatability error is 2.7%FS. The data of the fiber-optic pressure sensor in different positions maintain consistent and repeatable, which can meet the requirement of the real-time monitoring of the axial force of transformer winding.

关键词： Transformer winding pressure sensor fiber Bragg grating (FBG) axial force

Characteristics Research on Self-Amplified Distributed Feedback fiber Laser

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Photonic Sensors 2014年第3期4卷 265-268页

作者： Zhiqiang SONG Haifeng QI Jian GUO Chang WANG Gangding PENG shandong key laboratory of optical fiber sensing technologies Laser Institute of Shandong Academy of SciencesJinan 250014 China School of Electrical Engineering and Telecommunications University of New South Wales Sydney Australia 2052

A distributed feedback （DFB） fiber laser with a ratio of the backward to forward output power of 1：100 was composed by a 45-ram-length asymmetrical phase-shifted fiber grating fabricated on the 50-mm erbium-doped photosensitive fiber. Forward output laser was amplified using a certain length of Nufern EDFL-980-Hp erbium-doped fiber to absorb the surplus pump power after the active phase-shifted fiber grating and get population inversion. By using OptiSystem software, the best fiber length of the EDFL to get the highest gain was simulated. In order to keep the amplified laser with the narrow line-width and low noise, a narrow-band light filter consisting of a fiber Bragg grating （FBG） with the same Bragg wavelength as the laser and an optical circulator was used to filter the amplified spontaneous emission （ASE） noise of the out-cavity erbium-doped fiber. The designed laser structure sufficiently utilized the pump power, and a DFB fiber laser with the 32.5-mW output power, l l.5-kHz line width, and -87-dB/Hz relative intensity noise （R1N） at 300 mW of 980 nm pump power was brought out.

关键词： Distributed feedback fiber laser self-amplification narrow-linewidth low-noise

One-step plasmonic welding and photolithographic patterning of silver nanowire network by UV-programable surface atom diffusion

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Nano Research 2022年第3期15卷 2582-2591页

作者： Gui-Shi Liu Ting Wang Yexiong Wang Huajian Zheng Yunsen Chen Zijie Zeng Lei Chen Yaofei Chen Bo-Ru Yang Yunhan Luo Zhe Chen Guangdong Provincial key laboratory of optical fiber sensing and Communications Key Laboratory of Visible Light Communications of GuangzhouKey Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education InstitutesDepartment of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China State key laboratory of Optoelectronic Materials and technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China

Silver nanowire(AgNW)based transparent electrode(TE)plays a pivotal role in optoelectronics where TE is generally required to have fine pattern and high *** the rapid technological advances in either welding or patterning of AgNWs,there are few studies that combine the two processes in a simple and practical ***,aiming to fabricate high-performance patterned AgNW TE,we develop a simplified photolithography that enables both plasmonic nanowelding with low-level UV exposure(20 mW/cm^(2))and high-resolution micropatterning without photoresist and etching process by conjugating AgNW with diphenyliodonium nitrate(DPIN)and UV-curable *** cellulose as a binder can effectively enhance plasmonic heating,adhesion,and stability,while the photosensitive DPIN,capable of modulating surface atom diffusion,can boost the plasmonic welding at AgNW junction and induce patterning in AgNW network with Plateau-Rayleigh *** fabricated AgNW TE has high figure of merit of up to 1,000(3.7Ω/sq at 90%transmittance)and minimal pattern size down to 3µm,along with superior ***,a flexible smart window with high performance is demonstrated using the patterned and welded AgNW TEs,verifying the applicability of the simplified photolithography technique to optoelectronic devices.

关键词： silver nanowires plasmonic welding patterning Plateau-Rayleigh instability transparent electrodes

Temperature-controlled mode selection of Er-doped random fiber laser with disordered Bragg gratings

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Photonics Research 2016年第3期4卷 102-105页

作者： W.L.Zhang Y.B.Song X.P.Zeng R.Ma Z.J.Yang Y.J.Rao key laboratory of optical fiber sensing & Communications (Education Ministry of China) University of Electronic Science & Technology of China

In this paper, we proposed a way to realize an Er-doped random fiber laser(RFL) with a disordered fiber Bragg grating(FBG) array, as well as to control the lasing mode of the RFL by heating specific locations of the disordered FBG array. The disordered FBG array performs as both the gain medium and random distributed reflectors, which together with a tunable point reflector form the RFL. Coherent multi-mode random lasing is obtained with a threshold of between 7.5 and 10 mW and a power efficiency between 23% and 27% when the reflectivity of the point reflector changes from 4% to 50%. To control the lasing mode of random emission, a specific point of the disordered FBG array is heated so as to shift the wavelength of the FBG(s) at this point away from the other ***, different resonance cavities are formed, and the lasing mode can be controlled by changing the location of the heating point.

关键词： mode Temperature-controlled mode selection of Er-doped random fiber laser with disordered Bragg gratings

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Self-assembled monolayer modulated Plateau-Rayleigh instability and enhanced chemical stability of silver nanowire for invisibly patterned,stable transparent electrodes

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Nano Research 2022年第5期15卷 4552-4562页

作者： Gui-Shi Liu Huajian Zheng Zijie Zeng Yexiong Wang Weidong Guo Ting Wang Heng Chen Yunsen Chen Shiqi Hu Lei Chen Yaofei Chen Weiguang Xie Bo-Ru Yang Yunhan Luo Guangdong Provincial key laboratory of optical fiber sensing and Communications Key Laboratory of Visible Light Communications of GuangzhouKey Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education InstitutesDepartment of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China Siyuan laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632China State key laboratory of Optoelectronic Materials and technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510006China

Patterned silver nanowire(AgNW)networks have been widely used as transparent electrodes in many optoelectrical ***,obvious patterning visibility and poor thermostability of AgNW are still limiting its practical ***,we report self-assembled monolayer(SAM)modulated Plateau-Rayleigh instability(PRI)of AgNW,which allows invisible patterning and superior stability of the AgNW *** opposite effects of different SAMs on the PRI are identified:the alkanethiol SAMs activate surface atom diffusion while the mercaptobenzoheterocyclic(MBH)SAMs suppress the *** degradation temperature of the AgNWs can be therefore,for the first time,tuned in the range of 193-381℃,so that the AgNW network can be patterned via PRI with a tiny optical difference between the insulative and conductive regions,i.e.,patterning ***,the MBH SAMs provide AgNW with excellent durability under thermal annealing and oxidation,which enhances the maximum heating temperature of the AgNW transparent heater by over 120℃.Beyond the micro-patterning,we consider that the developed SAM strategy can be extended to other metal nanowires for stability improvement and has huge potential in nanoengineering of one-dimensional metal materials.

关键词： Plateau-Rayleigh instability self-assembled monolayer invisible patterning thermal stability

Interferometric Distributed sensing System With Phase optical Time-Domain Reflectometry

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Photonic Sensors 2017年第2期7卷 157-162页

作者： Chen WANG Ying SHANG Xiaohui LIU Chang WANG Hongzhong WANG Gangding PENG shandong Provincial key laboratory of optical fiber sensing technologies Laser Institute of Shandong Academy of Sciences Jinan 250014 China Shengli Oilfield Xinsheng Geophysical Technology Co. Ltd. No. 23 Xingfu Road Dongying 257086 China School of Electrical Engineering & Telecommunications The University of New South Wales NSW 2052 Australia

We demonstrate a distributed optical fiber sensing system based on the Michelson interferometer of the phase sensitive optical time domain reflectometer （q0-OTDR） for acoustic measurement. Phase, amplitude, frequency response, and location information can be directly obtained at the same time by using the passive 3 ×3 coupler demodulation. We also set an experiment and successfully restore the acoustic information. Meanwhile, our system has preliminary realized acoustic-phase sensitivity around -150 dB （re rad/μPa） in the experiment.

关键词： fiber optics sensors Rayleigh scattering optical time domain reflectometry interferometry

Short distributed feedback fiber laser with unidirectional output for sensing applications

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Chinese Optics Letters 2013年第4期11卷 44-46页

作者：祁海峰宋志强彭纲定李淑娟王昌 shandong key laboratory of optical fiber sensing technologies Laser Institute of Shandong Academy of Sciences School of Electrical Engineering and Telecommunications The University of New South Wales

A short distributed feedback fiber laser with a nearly unidirectional output is fabricated and tested. The short fiber laser is made of a polarization-dependent phase-shift grating fabricated with a vertically polarized 244-nm ultraviolet （UV） laser. A single π phase-shift is introduced to a 2-cm grating at a specified position by directly moving the phase mask during UV beam scanning. Test results show that the laser has a single polarization longitudinal mode with 2.6-mW pump threshold. The backward-to- forward output power ratio is approximately 30：1. The relative intensity noise is -88 dB/Hz, and the linewidth is approximately 10 kHz at 75-mW 980-nm pumping. The unidirectional output and short dimension of this short fiber laser make it very useful in sensing applications, especially in multiplexed sensing aoolications.

关键词： Phase shift Phase shifters Polarization Pumping (laser)

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Vector mode based optical direct detection orthogonal frequency division multiplexing transmission in short-reach optical link

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Frontiers of Optoelectronics 2019年第1期12卷 41-51页

作者： Jianping LI Zhaohui LI Guangdong Provincial key laboratory of optical fiber sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China State key laboratory of Optoelectronic Materials and technologies and School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510275China

As one solution to implement the largecapacity space division multiplexing(SDM)transmission systems,the mode division multiplexing(MDM)has gained much attention *** vector mode(VM),which is the eigenmode of the optical fiber,has also been adopted to realize the optical communications including the transmission over free-space optical(FSO)and optical fiber *** the concerns on the short-reach optical interconnects,the low cost and high integration technologies should be *** detection(DD)with higher-order modulation formats in combination of MDM technologies could offer an available trade-off in system performance and *** review demonstrations of FSO and fiber high-speed data transmission based on the VM MDM(VMDM)*** special VMs,cylindrical vector beams(CVB),have been generated by the q-plate(QP)and characterized *** then they were used to implement the VMDM transmission with direct-detection orthogonal frequency division multiplexing(DD-OFDM).These demonstrations show the potential of VMDM-DD-OFDM technology in the large-capacity short-reach transmission links.

关键词： space division multiplexing (SDM) mode division multiplexing (MDM) few-mode fiber (FMF) vector mode (VM) cylindrical vector beam (CVB) orthogonal frequency division multiplexing (OFDM) direct detection (DD) optical interconnect

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