- 标题
- 摘要
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- 实验方案
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A novel methodology for spark gap monitoring in Micro-EDM using optical fiber Bragg grating
摘要： Micro-Electric Discharge Machining (Micro-EDM) are the most considerable micro-manufacturing process used to engineer miniaturized features on any high temperature resistive hard material. The machining parameters in Micro-EDM are very stochastic in nature. The spark gap measure acts as a vital parameter that correlates with other process parameters for enhancement of Material Removal Rate (MRR) in Micro-EDM. Real-time actual measurement of spark gap between the electrodes is highly challenging and is limited due to the small gap measure. The present work is on development of a novel sensing technique for spark gap measurement, based on a Fiber Bragg Grating (FBG) sensor. The sensing system is developed on a cantilever structure bonded with the FBG sensor, for determining accurate spark gap measure with displacement measurement of the tool electrode. The deflection on the cantilever during spark gap generation is translated into strain variations monitored by the FBG bonded over it. Experimental trials are conducted on Micro-EDM set-up with the cantilever beam based displacement sensing with a sensitivity of 10 μm/pm. Real-time spark gap data obtained by FBG are in the range of 1.1-18.6 μm and are validated against a precision measuring instrument. This sensing technology employed for Micro-EDM spark gap measurement establishes a novel technique in micromachining field and formulates a smart system.
关键词： Cantilever beam structure,Micromachining,Spark gap,Fiber optics,Micro-EDM,Bragg Gratings
更新于2025-09-12 10:27:22
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Nonlinear Fiber Optics || Introduction
摘要： This introductory chapter is intended to provide an overview of the fiber characteristics that are important for understanding the nonlinear effects discussed in later chapters. Section 1.1 provides a historical perspective on the progress in the field of fiber optics. Section 1.2 discusses various fiber properties such as optical loss, chromatic dispersion, and birefringence. Particular attention is paid to chromatic dispersion because of its importance in the study of nonlinear effects probed by using ultrashort optical pulses. Section 1.3 introduces various nonlinear effects resulting from the intensity dependence of the refractive index and stimulated inelastic scattering. Among the nonlinear effects that have been studied extensively using optical fibers as a nonlinear medium are self-phase modulation, cross-phase modulation, four-wave mixing, stimulated Raman scattering, and stimulated Brillouin scattering. Each of these effects is considered in detail in separate chapters. Section 1.4 gives an overview of how this book is organized for discussing such a wide variety of nonlinear effects in optical fibers.
关键词： fiber optics,stimulated Raman scattering,four-wave mixing,stimulated Brillouin scattering,chromatic dispersion,nonlinear effects,self-phase modulation,cross-phase modulation,birefringence
更新于2025-09-12 10:27:22
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Vectorial dispersive shock waves in optical fibers
摘要： Dispersive shock waves are a universal phenomenon encountered in many fields of science, ranging from fluid dynamics, Bose-Einstein condensates and geophysics. It has been established that light behaves as a perfect fluid when propagating in an optical medium exhibiting a weakly self-defocusing nonlinearity. Consequently, this analogy has become attractive for the exploration of dispersive shock wave phenomena. Here, we observe of a novel class of vectorial dispersive shock waves in nonlinear fiber optics. Analogous to blast-waves, identified in inviscid perfect fluids, vectorial dispersive shock waves are triggered by a non-uniform double piston imprinted on a continuous-wave probe via nonlinear cross-phase modulation, produced by an orthogonally-polarized pump pulse. The nonlinear phase potential imparted on the probe results in the formation of an expanding zone of zero intensity surrounded by two repulsive oscillating fronts, which move away from each other with opposite velocities.
关键词： Dispersive shock waves,nonlinear fiber optics,cross-phase modulation,optical fluids
更新于2025-09-12 10:27:22
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[OSA Optical Fiber Sensors - Lausanne (2018..-..)] 26th International Conference on Optical Fiber Sensors - Monitoring of the Drilling-Induced Temperature Profile in CFRP Plates Using Distributed Optical Fiber Sensing
摘要： Distributed fiber sensing based on optical frequency-domain reflectometry is proposed for monitoring the two-dimensional temperature profile resulting during drilling carbon reinforced fiber polymers. Experimental results demonstrate the unique features and advantages provided by this technology.
关键词： Scattering,Rayleigh,Temperature,Fiber optics sensors
更新于2025-09-12 10:27:22
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[OSA Optical Fiber Sensors - Lausanne (2018..-..)] 26th International Conference on Optical Fiber Sensors - High Pressure FBG Sensor based on Compression Using a Single Point Attached Fiber in a Ferrule
摘要： A compact high pressure FBG sensor using a single point attached fiber in a ferrule was proposed. It was compared theoretically, by simulations and experimentally to FBG fully attached to the ferrule conception. Results show that the proposed conception has 3.2 to 4.2 times higher sensitivity, suited to use in internal combustion chamber engine.
关键词： Fiber optics sensors,Fiber optics and optical communications
更新于2025-09-11 14:15:04
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AlPO <sub/>4</sub> in Silica Glass Optical Fibers: Deduction of Additional Material Properties
摘要： A silica clad optical ?ber with a core comprised of SiO2, P2O5, Al2O3, and AlPO4 is analyzed in order to determine the impact of AlPO4 when added to silica. A chromatic dispersion curve is presented, from which the nonlinear refractive index is estimated to be similar to that of silica. When doped into SiO2, AlPO4 decreases the thermo-optic coef?cient (slightly), decreases the acoustic velocity, broadens the Brillouin spectral width through increased viscoelastic damping, and reduces the strength of the dependence of Brillouin frequency on temperature. Findings herein indicate that AlPO4 has a near-zero value of p12. It also is found that the ?ber does not have complete AlPO4 formation, with some P2O5 formation in Al2O3-rich regions of the ?ber. Given the relevance of AlPO4 to high power active ?ber technology, the presented data can be used for designing ?bers with enhanced performance characteristics, such as those with elevated threshold for the onset of stimulated Brillouin scattering.
关键词： Fiber optics,phosphorus,aluminum,?ber lasers,?ber nonlinear optics,optical materials,optical ?ber testing,glass
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE 16th International Conference on Smart Cities: Improving Quality of Life Using ICT & IoT and AI (HONET-ICT) - Charlotte, NC, USA (2019.10.6-2019.10.9)] 2019 IEEE 16th International Conference on Smart Cities: Improving Quality of Life Using ICT & IoT and AI (HONET-ICT) - Review of Studies that Integrate the Free Space Optics with Fiber Optics
摘要： This paper presents a comprehensive survey on the importance of free space optics (FSO) systems used as last mile for communication systems and their integration with optical fibers. Optical fiber is already being used in the backbone networks due to its high speed and high bandwidth qualities but the last mile has always been a problem. Last mile is the last physical connection between access network and the end user. FSO systems provide an innovative solution to this problem. The surveyed integration techniques are explained with their working principles. All the nodes used to make this integration possible are also thoroughly explained. The advantages and disadvantages of FSO systems are also listed and discussed. The paper also discusses current challenges and directions for future research.
关键词： Free space optics,Wireless networks,Access network,Fiber optics
更新于2025-09-11 14:15:04
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2D Plasmonic Tungsten Oxide Enabled Ultrasensitive Fiber Optics Gas Sensor
摘要： Functional materials coated on optical fibers have demonstrated great potential for optical gas sensing applications. However, their sensitivity is typically limited to the sub-parts per million (sub-ppm) range. Here, for the first time a 2D near-infrared plasmonic tungsten oxide (WOx) enabled ultrasensitive fiber optics gas sensor on a side-polished D-shape single mode optical fiber is presented. The plasmon resonance wavelength range of 2D WOx is matched with a conventional telecommunications wavelength of 1550 nm for driving the optical fiber, therefore inducing a strong light–matter interaction. Upon the surface adsorption of gas molecules, free electrons in the 2D WOx body are redistributed changing the plasmon resonance properties and hence the transmission through the optical fiber. The sensor is selectively responsive to NO2 at concentrations down to 44 parts per billion (ppb) with a limit of detection of 8 ppb at a relatively low elevated temperature. Such an excellent sensing performance is significantly improved over the previously reported fiber optics NO2 sensors, which suggests the integration of 2D plasmonic degenerated semiconductors as a viable approach to develop high-performance fiber optics gas sensors.
关键词： fiber optics,2D materials,NO2 gas sensors,plasmonic materials
更新于2025-09-11 14:15:04
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Chromatic Dispersion Estimation Based on CAZAC Sequence for Optical Fiber Communication Systems
摘要： We propose a chromatic dispersion (CD) estimation method based on constant amplitude zero-autocorrelation (CAZAC) sequence and fractional Fourier transform (FrFT) algorithm for optical fiber communication systems, which extends the application of CAZAC sequence. By applying FrFT on the CAZAC sequence signal, the optimal order is searched and employed to estimate the accumulated CD because that the CAZAC sequence shares similar properties with chirp signal. We demonstrate the feasibility of the proposed method by the simulation of a 28 GBaud polarization-division-multiplexed (PDM) quadrature phase-shift keying (QPSK) optical fiber communication system. The error of CD estimation is less than 70 ps/nm for the standard single mode fiber (SSMF) link of 2000 km with OSNR in the range of 10-20 dB and the launch power in the range of 0-4 dBm per channel in a five channel system. It shows that the method is robust to ASE noise and optical fiber nonlinearity. Furthermore, the proposed method has been experimentally verified with the error of CD estimation less than 50 ps/nm after 100-900 km fiber link transmission.
关键词： Chromatic dispersion,fiber optics systems,CAZAC sequence,fractional domain.
更新于2025-09-11 14:15:04
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Characterization of ultra-narrow linewidth lasers for phase-sensitive coherent reflectometry using EOM facilitated heterodyning
摘要： A new scheme of heterodyning facilitated by electro-optic modulator (EOM) is used to characterize the Allan deviation and phase noise of the beat note generated using different pairs of highly coherent lasers. Use of EOM greatly expands optical frequency difference range between the paired lasers suitable for heterodyning. Experimentally demonstrated that sensitivity of optical time-domain reflectometer is mostly determined by the instantaneous linewidth of the probing laser. Observed laser frequency linear drift for all tested lasers was found to be harmless at 1 kHz probing rate. Demonstrated technique can be used to qualify lasers for phase-sensitive optical distributed sensing applications.
关键词： heterodyning,sensors,fiber optics systems
更新于2025-09-11 14:15:04