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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - An Investigation on 25Gb/s Ultra-Short Cavity Quantum Well Lasers Operated at Elevated Temperatures
摘要： A Fabry-Perot quantum well laser with ultra-short cavity is designed and fabricated. The emission wavelength is at 1310nm band which is important for data center applications. The shortest cavity length is 25?m, and the laser has mW-class output with low threshold currents (4mA in average). At room temperature, an opened eye diagram with 28Gb/s transmission rate can be observed. Clear 25Gb/s eye patterns from 15oC to 65oC are also demonstrated.
关键词： Modulation,Fabry-Perot,Semiconductor lasers,Multiple quantum well,Diode lasers
更新于2025-09-11 14:15:04
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Miniature Spectral Imager in-Orbit Demonstration Results from Aalto-L Nanosatellite Mission
摘要： This paper provides a summary of Finnish Aalto-1 CubeSat mission results so far, and concentrates especially on the results achieved with it’s miniature hyperspectral camera for Earth Observation. The Aalto-1 satellite is a multipayload nanosatellite with total mass of 4kg. It features three different scientific payloads, all built for in-orbit technology demonstration. The main payload of the mission is a tiny hyperspactral camera AaSI, especially built for CubeSats satellite. The spectral camera is based on Fabry-Perot interferometric spectral filter technology and it is capable to measure freely adjustable spectral channels. The mass of the camera is only 592 grams. Additionally, the satellite features a deorbiting experiment and a radiation monitor instrument. The satellite platform has three-axis stabilization, two channel communication system and powerful on-board computer. The Aalto-1 satellite was launched on 23 June 2017 and the first image with the AaSI camera was acquired on 5 July 2017. By May 2018 the satellite has taken several images and spectral images and achieved the most important mission goals. The Aalto-1 mission results demonstrated for the first time in-orbit that a miniature Fabry-Perot spectral camera for Earth Observation can be successfully operated in space.
关键词： nanosatellite,Aalto-1,Earth Observation,Fabry-Perot interferometric spectral filter,hyperspectral camera,CubeSat
更新于2025-09-10 09:29:36
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High sensitivity strain sensor based on twin hollow microspheres
摘要： A sensor based on 2 hollow core microspheres is proposed. Each microsphere was produced separately through fusion splicing and then joined. The resultant structure is a Fabry-Perot interferometer with multiple interferences that can be approximated to a 4-wave interferometer. Strain characterization was attained for a maximum of 1350 με, achieving a linear response with a sensitivity of 3.39 (cid:1) 0.04 PM/με. The fabrication technique, fast and with no chemical hazards, as opposed to other fabrication techniques, makes the proposed sensor a compelling solution for strain measurements in hash environments.
关键词： strain measurement,fiber optics sensors,Fabry-Perot
更新于2025-09-10 09:29:36
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Magneto-Electric Dipole Antenna (MEDA)-Fed Fabry-Perot Resonator Antenna (FPRA) With Broad Gain Bandwidth in Ku Band
摘要： One planar Fabry-Perot resonator antenna (FPRA) with broad gain bandwidth is proposed in this paper. Magneto-electric dipole antenna (MEDA) is used as the feeding antenna providing good impedance matching and stable radiation pattern over the whole Ku band. Then gain enhancement is realized by loading with one partially reflective surface (PRS), which consists of a single dielectric slab with two-dimensional patches array on both surfaces. Unlike the sharply negative phase slope of conventional cover designs, the proposed one produces a much gentle reflective phase gradient with both negative and positive phase slopes. Thus the gain property of the MEDA is obviously improved along the whole band. One prototype is fabricated for verification and the results show that the proposed antenna has a wide impedance bandwidth, which is 56.25% for S11<-10dB, ranging from 11.5 GHz to 18.7 GHz. It possesses a 3-dB gain bandwidth of 35% from 12.3 GHz to 17.2 GHz with a peak gain of 11.2 dBi at 14 GHz. Compared with the unloaded type, gain enhancement of about 1.5~5 dBi is achieved. Due to the advantages of simple structure and broad gain bandwidth, this method is a good option to design antennas in satellite communication systems in future.
关键词： Fabry-Perot resonator antenna (FPRA).,Broadband high gain,magneto-electric dipole antenna (MEDA)
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Diffraction Correction of Locking Fabry-Perot Interferometer in Calculable Capacitor at NIM
摘要： This paper describes a diffraction correction of the displacement measurement in calculable capacitor. A mathematical model of the locking interferometer based on Gaussian beam propagation is set up. The phase difference between the two cavities of interest is analyzed numerically. The simulation result demonstrates that the minimum value of the displacement correction can be obtained by actively detecting the laser light at a distance of 560 mm from output mirror.
关键词： Fabry-Perot interferometer,displacement measurement,Calculable capacitor,diffraction correction
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Helium-Based Refractometry for Pressure Measurements in the Range 1–100 kPa
摘要： This paper describes an alternative of pressure measurements based on a helium absolute refractometer at 532 nm. The Fabry-Perot cavity has been characterized from relevant parameters and the resolution in pressure of this new optical pressure sensor is lower than 0.2 Pa.
关键词： Pressure-induced distortion coefficient,Coefficient of thermal expansion,Refractometry,Fabry-Perot cavity,Pressure sensor
更新于2025-09-10 09:29:36
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Fabry-Perot interferometry in Weyl semi-metals
摘要： We show that the electrical transport across a minimal model for a time-reversal symmetry(TRS) breaking Weyl semi-metal (WSM) involving two Weyl nodes can be interpreted as an interferometer in momentum space. The interference phase depends on the distance between the Weyl nodes ( (cid:126)δk) and is anisotropic. It is further shown that a minimal inversion symmetry broken model for a WSM with four Weyl nodes effectively mimics a situation corresponding to having two copies of the interferometer due to the presence of an orbital pseudo-spin domain wall in momentum space. We point out that the value of the δk and consequently the interference phase can be tuned by driving the WSMs resulting in oscillations in the two terminal conductance measured in the direction of splitting of the Weyl nodes.
关键词： Weyl semi-metals,Fabry-Perot interferometry,inversion symmetry breaking,orbital pseudo-spin,time-reversal symmetry breaking
更新于2025-09-10 09:29:36
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Micro Fabry-Pérot Interferometer at Rayleigh Range
摘要： The Fabry-Pérot interferometer is used in a variety of high-precision optical interferometry applications, such as gravitational wave detection. It is also used in various types of laser resonators to act as a narrow band filter. In addition, ultra-compact Fabry-Pérot interferometers are used in the optical resonators of semiconductor lasers and fiber-optic systems. In this work, we developed a micro-scale Fabry-Pérot interferometer that was constructed within the Rayleigh range of the optical focusing system. The high precision that is conventionally required for the optical parallelism and the surface accuracy of the mirrors was not so critical for this type of Fabry-Pérot interferometer. The interferometer was constructed using a gold-coated silicon microcantilever with reflectivity of 92% and a dielectric multilayer flat mirror with reflectivity of 85%. The focal spot size of the laser beam is 20 μm and the cavity length is approximately 20 μm. The finesse was measured to be approximately 25. The interferometric characteristics of the device were consistent with the theoretically calculated performance. The developed micro Fabry-Pérot interferometer has the potential to make a marked contribution to advances in optical measurements in various micro sensing system.
关键词： microcantilever,Rayleigh range,optical measurements,optical interferometry,Fabry-Pérot interferometer
更新于2025-09-10 09:29:36
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The Surface and Interface Engineering Multi-Layered Nanopore Films for Enhanced Fabry-Pérot Interferences
摘要： In this study, a broadly-tunable nanoporous thin film system with alternating layers of Ag/indium tin oxide (ITO)/CoFeB/ITO/Ag, which was fabricated on a porous anodic aluminum oxide (AAO) substrate, was presented, so as to achieve the flexible tailoring of the Fabry-Pérot interference. The experimental results demonstrated that the amplitude of the Fabry-Pérot interference of this system, which had only an Ag layer deposited on the AAO substrate, was 12 times higher than that of pure AAO film, aside from the tunable oscillation periods. This was mainly due to the fact that the Ag mirror greatly improved the reflectivity of the air/AAO interface, rendering the intensities of light reflected from the air/AAO and AAO/Al interfaces comparable, thereby forming an effective interference enhancement. Furthermore, the existence of the ferromagnetic CoFeB layer was capable of significantly improving the absorbance in the ultraviolet and visible spectral ranges, and, in particularly, the oscillation ranges could be extended to the near-infrared spectral range (> 2,600 nm) by utilizing an ITO with lower conductivity as a spacer layer, due to its material dispersion which was approximately equal to zero. This new nanoporous thin film system represents a powerful tool for the future development of ultrasensitive optical devices based on the Fabry-Pérot interference and investigation of many interesting physical phenomena.
关键词： Ag/ITO/CoFeB/ITO/Ag layers,Hybrid Materials,Magnetic,Plasmonics,AAO substrate,Fabry-Pérot interference,Nanoporous thin film,Optical
更新于2025-09-10 09:29:36
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Dual Fabry–Pérot Interferometric Carbon Monoxide Sensor Based on the PANI/Co3O4 Sensitive Membrane-Coated Fibre Tip
摘要： A novel dual Fabry–Pérot (F-P) interferometric carbon monoxide gas sensor based on polyaniline/Co3O4 (PANI/Co3O4) sensing film coated on the optical fibre end face is proposed and fabricated. Its structure is composed of standard single-mode-fibre (SMF), endlessly photonic crystal fibre (EPCF), and PANI/Co3O4 sensing membrane (PCSM). Therefore, they form three F-P reflectors, the reflector between SMF and EPCF, that between EPCF and PCSM, and interface between PCSM and air. So, the dual F-P interferometer is achieved. The results show that in the range of 0–70 ppm, the interference spectra appear red shift with the increasing carbon monoxide concentration. In addition, the high sensitivity of 21.61 pm/ppm, the excellent linear relationship 2 = 0.98476), and high selectivity for carbon monoxide (R are achieved. The response and recovery time are 35 and 84 s, respectively. The sensor has the advantages of high sensitivity, strong selectivity, low cost, and simple structure and is suitable for sensitive detection of trace carbon monoxide gas.
关键词： Photonic Crystal Fibre,Polyaniline,Dual Fabry–Pérot Interferometer,Co3O4,Gas Sensor,Carbon Monoxide
更新于2025-09-09 09:28:46