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Low-loss microwave photonics links using hollow core fibres

Light(science & Applications) 2022年第8期11卷 1891-1902页

作者： Xi Zhang Zitong Feng David Marpaung Eric Numkam Fokoua Hesham sakr John Richard Hayes Francesco Poletti David John Richardson Radan slavík Optoelectronics Research Centre University of SouthamptonSouthamptonSO171BJUK Laser Physics and Nonlinear Optics Group Faculty of Science and TechnologyMESA+Institute for NanotechnologyUniversity of TwenteEnschede7500 AEThe Netherlands

There are a host of applications in communications, sensing, and science, in which analogue signal transmission is preferred over today’s dominant digital transmission. In some of these applications, the advantage is in lower cost, while in others, it lies in superior performance. However, especially for longer analogue photonics links (up to 10 s of km), the performance is strongly limited by the impairments arising from using standard single-mode fibres (ssMF). Firstly, the three key metrics of analogue links (loss, noise figure, and dynamic range) tend to improve with received power, but this is limited by stimulated Brillouin scattering in ssMF. Further degradation is due to the chromatic dispersion of ssMF, which induces radio-frequency (RF) signal fading, increases even-order distortions, and causes phase-to-intensity-noise conversion. Further distortions still, are caused by the Kerr nonlinearity of ssMF. We propose to address all of these shortcomings by replacing ssMFs with hollow-core optical fibres, which have simultaneously six times lower chromatic dispersion and several orders of magnitude lower nonlinearity (Brillouin, Kerr). We demonstrate the advantages in this application using a 7.7 km long hollow-core fibre sample, significantly surpassing the performance of an ssMF link in virtually every metric, including 15 dB higher link gain and 6 dB lower noise figure.

关键词： nonlinearity microwave shortcomings

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国际熔炉:展中展的民族性

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艺术与设计 2018年第10期7卷 50-55页

作者：健二 Connecting The Dots Tomá? slavík UMPRUM

伦敦设计节期间,英国设计往往独占鳌头。但位于城东区的伦敦设计展会（London Design Fair,前名为Tent London）却打着国际性的阵容展示出更多元的设计：来自36个国家的550个独立和资深品牌,在东伦敦的老杜鲁门啤酒厂的三层楼旧啤酒工... 详细信息

伦敦设计节期间,英国设计往往独占鳌头。但位于城东区的伦敦设计展会（London Design Fair,前名为Tent London）却打着国际性的阵容展示出更多元的设计：来自36个国家的550个独立和资深品牌,在东伦敦的老杜鲁门啤酒厂的三层楼旧啤酒工厂空间内进行了一次暗中较劲。瑞典、意大利、西班牙、阿联酋、芬兰都来势汹汹,其中虽然有不错的创意,但反而让韩国的“首尔设计节”展区略显优势。

关键词：国际性民族性伦敦设计节熔炉啤酒厂独立和意大利西班牙

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Classical imaging with undetected photons using four-wave mixing in silicon core fibers

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Photonics Research 2023年第2期11卷 137-142页

作者： M.HUANG D.WU H.REN L.sHEN T.W.HAWKINs J.BALLATO U.J.GIBsON M.BEREsNA R.slavíK J.E.sIPE M.LIsCIDINI A.C.PEACOCK Optoelectronics Research Centre University of SouthamptonSouthamptonSO171BJUK school of Optoelectronic Engineering and Instrumentation science Dalian University of TechnologyDalian 116024China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Centre for Optical Materials science and Engineering Technologies and Department of Materials science and Engineering Clemson UniversityClemsonSouth Carolina 29634USA Department of Physics University of TorontoTorontoOntario M5S 1A7Canada Department of Physics University of PaviaI-27100 PaviaItaly

Undetected-photon imaging allows for objects to be imaged in wavelength regions where traditional components are unavailable. Although first demonstrated using quantum sources, recent work has shown that the technique also holds with classical beams. To date, however, all the research in this area has exploited parametric downconversion processes using bulk nonlinear crystals within free-space systems. Here, we demonstrate undetectedphoton-based imaging using light generated via stimulated four-wave mixing within highly nonlinear silicon fiber waveguides. The silicon fibers have been tapered to have a core diameter of915 nm to engineer the dispersion and reduce the insertion losses, allowing for tight mode confinement over extended lengths to achieve practical nonlinear conversion efficiencies(-30 dB) with modest pump powers(48 m W). Both amplitude and phase images are obtained using classically generated light, confirming the high degree of spatial and phase correlation of our system. The high powers(>10 nW) and long coherence lengths(>4 km) associated with our large fiber-based system result in high contrast and stable images.

关键词： mixing fibers nonlinear

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