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- 实验方案
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Fiber-Optic Magnetic Field Sensing Based on Microfiber Knot Resonator with Magnetic Fluid Cladding
摘要： A kind of all-fiber magnetic field sensing structure is proposed and demonstrated here. The sensing element includes a microfiber knot resonator (MKR) cladded with magnetic fluid (MF). The low-index MgF2 slab is adopted as the substrate. The sensitivity increases with the decrease of the MKR ring diameter. The achieved maximum magnetic field sensitivity is 277 pm/mT. The results of this work have the potential to promote the development of magnetically controllable optical devices and the design of ultra-compact cost-effective magnetic field sensors.
关键词： quality factor,finesse,magnetic fluid,microfiber knot resonator
更新于2025-11-28 14:24:03
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Incoherent Gain-Assisted Ring Enhanced Gas Absorption Spectroscopy
摘要： A novel incoherent gain-assisted ring enhanced spectroscopy technique is presented overcoming the need for precise optical alignment and high reflectivity dielectric mirrors. A gain medium pumped below the lasing threshold is used to improve the ring finesse and, thus, the interaction length. Two configurations are considered and compared. The first configuration is dual coupler ring with the source outside the ring and the gain medium inside the ring, while the second configuration is single coupler resonator with the gain medium acting as the source. The configurations are studied analytically and experimentally for different system parameters. The experimental results are obtained for a coupling ratio of 90/10. The broadband source is the amplified spontaneous emission of a semiconductor optical amplifier (SOA), while another SOA is used as the gain medium. Acetylene (C2H2) gas absorption is measured around 1540 nm wavelength. The output spectrum of the ring is measured using a 70 pm resolution. The interaction length is found to be enhanced by a factor of 9.35 and 44 in case of the dual coupler and single coupler resonator, respectively, compared to the direct absorption of the gas cell.
关键词： Gas spectroscopy,effective length enhancement,fiber sensors,finesse enhancement,incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS),active fiber cavities
更新于2025-09-23 15:23:52
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[IEEE 2019 14th International Conference on Computer Engineering and Systems (ICCES) - Cairo, Egypt (2019.12.17-2019.12.17)] 2019 14th International Conference on Computer Engineering and Systems (ICCES) - Silicon photonic coupled-ring resonator in nested configuration comprising different length scales
摘要： Silicon photonics is continuing to develop for an increasing number of applications including data centers, miniaturized sensors and atomic clocks. The development involved the creation of the technology platform, design of innovative devices and developing models and methods for fabrication tolerance assessment. In our work, we suggest a novel structure for silicon photonic coupled-ring-resonator with an order of scale difference in the rings’ lengths and sensitivity analysis for this structure. The design consists of a long racetrack resonator of length 472.6 μm (sub-millimeter scale) nested by ring resonator of radius 25 μm. This radius was chosen to minimize bending losses. The coupling ratio of the directional couplers is designed to be 97/3. The suggested structure is fabricated by the IMEC fabrication facility which is using DUV lithography and silicon etching ePIXfab. The analysis shows that this structure can achieve higher finesse than the typical values of the conventional structure, even with reasonable fabrication tolerance. Experimentally a finesse of about 25 and a quality factor of about 17,000 is achieved. The proposed structure can improve the performance of optical sensing and filtering.
关键词： integrated sensors,silicon photonics,fabrication tolerance,finesse enhancement,nested filters,ring resonator
更新于2025-09-23 15:21:01
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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) - Development of ultrastable lasers at 1. 5μm
摘要： We report the development of ultrastable lasers at 1.5μm. Through PDH method, the fiber lasers are locked to two ultra-stable optical cavities with finesse of 483000 and 148000 respectively. Through comparing two similar ultrastable laser systems, the linewidth of 0.68Hz and the fractional frequency instability of 2.7×10-15 at 1s averaging time are achieved.
关键词： finesse,ultra-stable laser,fractional frequency instability
更新于2025-09-16 10:30:52