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- 摘要
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- 实验方案
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Probing SPR heating of metal nanostructures coated on fiber based plasmonic sensor
摘要： Surface plasmon resonance of metal nanostructures has become an indispensable tool in many fields. However, the plasmon-enhanced localized electric-field that enables those applications may cause local heating simultaneously, known as photothermal effect. Here, the photothermal response of metal nanostructures coated on fiber-based SPR sensor was investigated for the first time. The reflective resonance mode of a fiber Bragg grating (FBG) sensor was found shifted due to metal heating, and the temperature increase was determined both experimentally and computationally. It demonstrated that the heat generated by metal nanostructures was not negligible, which may cause undesired measurement error in SPR based sensor.
关键词： Fiber Bragg grating,Metal nanostructures,Surface plasmon resonance,Temperature measurement,Photothermal effect
更新于2025-09-19 17:13:59
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Mechanism of stimulated Mie scattering: Light-induced redistribution of self-assembled nanospheres of two-photon absorbing chromophore
摘要： We report the observation of backward stimulated Mie scattering (SMS) due to light-field induced spatial redistribution of self-assembled nanospheres of a two-photon resonant organic chromophore in water, pumped by ～10-ns laser pulses of ～816-nm wavelength. The pump-energy threshold for generating backward stimulated scattering in such a system is remarkably lower than that in pure water. The gain of backscattering originates from an induced Bragg grating that reflects partial energy from the pump beam into the backward Mie scattering beam. Based on the experimental fact that the time-delay of the SMS pulse onset depends on both the pump level and the viscosity of the solvent, a physical model of SMS generation is proposed. Our experimental results have shown that the major contribution to the formation of an induced Bragg grating is spatial redistribution of nanoparticles suspended in the liquid. These nanoparticles are driven by a force that is proportional to the intensity gradient of the standing-wave field resulting from interference between the forward pump beam and the backward Mie scattering beam. When the nanoparticle motion is frozen in a gel-like medium, no SMS is observed, which experimentally supports the validity of the proposed physical model.
关键词： two-photon absorbing chromophore,stimulated Mie scattering,nanospheres,light-induced redistribution,Bragg grating
更新于2025-09-19 17:13:59
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[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Performance Analysis of Cost-efficient High-speed up to 32 Gbit/s WDM-PON Next-generation Access Network with Dispersion Compensation
摘要： Third generation fiber-to-the-x (FTTx) will introduce wavelength division multiplexing (WDM) technology to increase data rates up to 40 Gbit/s, as well as coexist with current communication systems. WDM passive optical network (WDM-PON) based fiber-to-the-home (FTTH) system architecture together with the Next-generation passive optical network (NG-PON) can provide solution related to nowadays problems with transmission capacity. It is expected that NG-PON systems will become more cost-efficient at high per user data rates, providing different transmission speeds for end users, based on pay-as-you-grow approach. In this paper, our introduced system model is used to obtain WDM-PON system effectiveness for different data rates of up to 32 Gbit/s per downstream transmission channel. We created combined simulative-experimental WDM-PON transmission system model in environment of RSoft OptSim simulation software to compare the performance of non-return-to-zero (NRZ) on-off-keying (OOK) modulated PON transmission system versus transmission bitrate and distance. Results showed that proposed transmission system is capable to provide data transmission of up to 32 Gbit/s per channel with BER < 10?3, if additional forward error correction (FEC) is used. Additionally, to increase the reach of investigated system, fiber Bragg grating-based dispersion compensation module (FBG-DCM) is implemented, therefore enabling full pre-compensation of chromatic dispersion.
关键词： fiber Bragg grating,NG-PON,dispersion compensation,high-speed transmission,WDM-PON
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - The fabrication mechanism and spectral characteristics of Fiber Gratings fabricated by point-by-point direct-writing based on femtosecond laser pulses
摘要： In this paper, a series of fiber gratings with different spectrum characteristics are fabricated in standard telecommunication fiber without hydrogen loading by point-by-point direct writing method based on 100 femtosecond laser amplifier system at 800-nm central wavelength. They are including the fourth-order fiber Bragg grating, fiber Bragg grating Fabry-Perot cavity, sampling fiber Bragg grating and cascaded long period fiber grating. The experimental results show that the spectrum characteristics of fourth-order fiber Bragg gratings with Λ=1.93 μm period are obtained at the center wavelength λ=1394.5 nm, and the fiber Bragg grating Fabry-Perot cavity can be inscribed when the gating period is Λ=1.95 μm. Furthermore, the sampled fiber Bragg gratings with different sampled periods are fabricated by adjusting the sampling period. Finally, the spectrum of the cascaded long period fiber gratings is achieved by changing the grating pitch of long period grating with 3 mm, 5 mm and 7 mm, respectively. This study will provide a powerful experimental gist and theoretical basis for the fabrication of different types of fiber gratings by femtosecond laser point-by-point writing directly method.
关键词： fiber Bragg gratings (FBGs),sampled fiber Bragg grating (S-FBG),point-by-point (PBP) direct-writing method,cascaded long period fiber grating(C-LPFG)
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Design and simulation of etched physical structure fiber Bragg grating for fabricating high temperature sensors
摘要： Side-polishing single-mode fiber (SP-SMF) to the D-fiber and etch the physical structure Grating into the polishing flat surface. The simulation results of SP-SMF by COMSOL software show that the electric field contour lines at the air-cladding interface is continuous when the fiber cladding is polished to closer the core. Using Rsoft software to simulate the side-polished and etched fiber Bragg grating（SP-EFBG） and obtained the structural parameters of SP-EFBG, when the grating period and grating length and grating depth of the simulated SP-EFBG are 775nm and 10000μm and 150nm respectively, obtain the central wavelength and bandwidth and peak reflectivity is 1550nm and 0.2044nm and 90.79% respectively.
关键词： Rsoft Simulation,Side-polished fiber Bragg grating,High-temperature,COMSOL Simulation,Etched fiber Bragg grating
更新于2025-09-16 10:30:52
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Stable generation of orbital angular momentum mode with an all-fiber laser
摘要： In this paper, an all-fiber laser that can generate stable OAM modes with topological charges of ±1 is demonstrated. A ring-core fiber designed in-house is used to reduce the crosstalk between OAM mode and other modes. A ring-core fiber-based long-period fiber grating (LPFG) and a fiber Bragg grating (FBG) are employed to select desired OAM mode. The coupling ratio of LPFG from HE11 mode to OAM mode exceeds 16 dB, and the mode purity of ±1 is demonstrated. The purity of OAM mode is as high as 94.41%. This simple and compact fiber laser can be integrated into fiber-based OAM mode multiplexing optical communication system.
关键词： orbital angular momentum,fiber Bragg grating,ring-core fiber,long-period fiber grating,all-fiber laser
更新于2025-09-16 10:30:52
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Fiber grating sensing interrogation system based on a modulated grating Y-branch tunable laser for core-and-cladding-integrated fiber Bragg grating temperature measurement
摘要： Numerous studies have addressed various methods to interrogate fiber Bragg gratings (FBGs). However, conventional methods are ineffective for multipeak FBG demodulation. A core-and-cladding-integrated fiber Bragg grating (FBG) temperature-interrogation system, based on a modulated grating Y-branch (MG-Y) tunable laser and home-built FBG, is proposed in this study. The sensing system comprises an MG-Y tunable laser interrogation system, a 3-dB optical fiber coupler, a core-and-cladding-integrated FBG, a heating platform, and a personal computer. The core-and-cladding-integrated FBG with two reflection peaks is sampled by the designed MG-Y laser. The FBG has a period of 534 nm and a grating length of 2000 μm. It is fabricated in a single-mode fiber by femtosecond-laser writing through the fiber coating. The interrogator is suitable for temperature measurement via the core-and-cladding-integrated FBG. In tests of the temperature-interrogation system, a temperature change from 30 to 100 ○C generates spectral shifts toward longer wavelengths for both the core and cladding reflection peaks. For the core and cladding, temperature sensing sensitivities of 111 and 113 pm/○C with linearities of 0.993 and 0.99, respectively, during heating and 117 and 120 pm/○C with linearity coefficients of 0.994 and 0.99, respectively, during cooling are achieved.
关键词： fiber Bragg grating,femtosecond-laser writing,modulated grating Y-branch tunable laser,temperature measurement,core-and-cladding-integrated FBG
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Fiber Optic Seismic Monitoring System for Highway Rock Slope
摘要： for the stability is essential Seismic monitoring assessment of highway rock slope. This paper presents the design and implementation of a precision fiber optic seismic monitoring system for highway rock slope using fiber Bragg grating geophone and vertical-cavity surface-emitting laser-based interrogator. The overall composition, sensor design and interrogation scheme are introduced in detail. The field test results show that this system has great potential for stability monitoring of highway rock slope.
关键词： Fiber Bragg grating geophone,Vertical-cavity surface-emitting laser,Rock Slope,Seismic monitoring
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Micro-displacement Sensor with Temperature Compensation based on Double-ball Cascade and Fiber Bragg Grating
摘要： the with light of Bragg grating's According to the double-ball structure and the sensing characteristics of the fiber Bragg grating (FBG), a micro-displacement temperature sensor compensation is proposed and verified experimentally. The sensing structure is made of a FBG and a double-ball cascade. The first ball is used to excite the cladding mode, and the second can get the coupling interference between the cladding mode and the core mode. In inherent temperature characteristic, it can only be used to estimate temperature. The drift of single mode fiber transmission interference dip and Bragg grating spectrum are independent of each other. It reduces the influence of cross sensitivity between temperature and displacement. The experimental results show that the micro-displacement and temperature detection ranges are 0~0.16mm and 20~160°C; the micro-displacement and temperature sensitivities of the sensor are -89.892 nm/mm and -0.088 nm/°C, respectively. And the temperature sensitivity of FBG dip is 0.012 nm/°C. The with micro-displacement temperature-compensated by calculating the sensing matrix. measurement can obtained be
关键词： Fiber Bragg grating,Temperature compensation,Double-ball cascade,Micro-displacement
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Switchable Dual-wavelength Erbium-doped Fiber Laser with High OSNR and Stability Using PM-FBG and CFBG
摘要： A switchable dual-wavelength linear-cavity erbium-doped fiber laser based on a polarization maintaining fiber Bragg grating (PM-FBG) and a chirped FBG (CFBG) is proposed and experimentally demonstrated. Due to the polarization hole burning (PHB) effect introduced by the PM-FBG, the laser designed can operate in stable dual-wavelength mode with a wavelength spacing of 0.667 nm or easily switch to single-wavelength lasing mode by adjusting a polariza-tion controller at room temperature. The optical signal to noise ratio (OSNR) of the dual-wavelength output is >70 dB, and the wavelength fluctuation and power fluctuation are less than 0.02 nm and 0.04 dB respec-tively for both wavelengths during an experimental time of 30 minutes. In addition, the wavelength shifts with temperature tuning is also investigated.
关键词： switchable,polarization hole burning,polarization maintaining fiber Bragg grating,fiber laser
更新于2025-09-16 10:30:52