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High Q-factor reconfigurable microresonators induced in side-coupled optical fibres

Light(Science & Applications) 2023年第12期12卷 1867-1876页

作者： Victor Vassiliev Michael Sumetsky Aston Institute of Photonic Technologies Aston UniversityBirmingham B47ETUK

High Q-factor monolithic optical microresonators found numerous applications in classical and quantum optical signal processing,microwave photonics,ultraprecise sensing,as well as fundamental optical and physical ***,due to the solid structure of these microresonators,attaining the free spectral range tunability of most of them,critical for several of these applications,was,so far,*** address this problem,here we experimentally demonstrate that the side-coupling of coplanar bent optical fibres can induce a high Q-factor whispering gallery mode optical *** changing the curvature radius of fibres from the centimetre order to the millimetre order,we demonstrate fully mechanically reconfigurable optical microresonators with dimensions varying from the millimetre order to 100-micron order and free spectral range varying from a picometre to ten picometre *** developed theory describes the formation of the discovered microresonators and their major properties in a reasonable agreement with the experimental *** new microresonators may find applications in cavity QED,microresonator optomechanics,frequency comb generation with tuneable repetition rate,tuneable lasing,and tuneable processing and delay of optical pulses.

关键词： reconfigurable resonator repetition

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Low-loss microwave photonics links using hollow core fibres

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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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