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Phase regimes of parity-time-symmetric coupled-ring systems at exceptional points

Photonics Research 2022年第10期10卷 2374-2379页

作者： ZHUANG MA XIAOYAN ZHOU LIN ZHANG tianjin Key Laboratory of integrated Opto-electronics Technologies and Devices School of Precision Instruments and Opto-electronics EngineeringTianjin UniversityTianjin 300072China Peng Cheng Laboratory Shenzhen 518038China

The optical coupled resonant system consisting of an integrated resonator with gain and a resonator with loss provides an excellent platform to create exceptional points(EPs)in non-Hermitian *** previous studies have focused on the striking intensity feature of EPs,but its phase response is seldom *** this work,we present a thorough study on the phase response of an EP ***,the phase response exhibits distinct behavior depending on the ordering of the ring resonators:when the input light in a bus waveguide is coupled directly or indirectly to the ring with a gain,the phase response is featured by nonmonotonic transition and 2π monotonic transition,*** also prove that the newly identified phase features are theoretically *** phase responses produce unique group delays that have never been found in other coupled resonant *** results deepen our understanding on EPs in non-Hermitian systems and are potentially useful for practical applications exploiting phase features.

关键词： resonator waveguide coupled

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Robust generation of frequency combs in a microresonator with strong and narrowband loss

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Photonics Research 2017年第6期5卷 77-81页

作者： JING WANG ZHAOHONG HAN YUHAO GUO LIONEL C.KIMERLING JURGEN MICHEL ANURADHA M.AGARWAL GUIFANG LI LIN ZHANG Key Laboratory of Opto-Electronic Information Technology of Ministry of Education School of Precision Instruments and Opto-Electronics Engineering Tianjin University Key Laboratory of integrated Opto-Electronic Technologies and Devices in tianjin School of Precision Instruments and Opto-Electronics Engineering Tianjin University Department of Materials Science and Engineering Massachusetts Institute of Technology College of Optics and Photonics CREOL and FPCE University of Central Florida

Octave-spanning frequency comb generation in microresonators is promising, but strong spectral losses caused by material absorption and mode coupling between two polarizations or mode families can be detrimental. We examine the impact of the spectral loss and propose robust comb generation with a loss of even 300 dB/*** nonlinear dynamics show that a phase change associated with spectral losses can facilitate phase matching and Kerr comb generation. Given this unique capability, we propose a novel architecture of on-chip spectroscopy systems.

关键词： Robust generation of frequency combs in a microresonator with strong and narrowband loss THz

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Robust cavity soliton formation with hybrid dispersion

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Photonics Research 2018年第6期6卷 647-651页

作者： JING WANG YUHAO GUO HENAN LIU LIONEL C.KIMERLING JURGEN MICHEL ANURADHA M.AGARWAL GUIFANG LI LIN ZHANG Key Laboratory of Opto-Electronic Information Technology of Ministry of Education School of Precision Instrument and Opto-Electronics EngineeringTianjin University Key Laboratory of integrated Opto-Electronic Technologies and Devices in tianjin School of Precision Instrument and Opto-Electronics EngineeringTianjin University Department of Materials Science and Engineering Massachusetts Institute of Technology College of Optics and Photonics CREOL and FPCEUniversity of Central Florida

Microresonator-based Kerr frequency combs have attracted a great deal of attention in recent years, in which mode locking of the generated combs is associated with bright or dark cavity soliton formation. In this paper, we show a unique that, different from soliton propagation along a waveguide, cavity solitons can be robustly formed under dispersion profile with four zero-dispersion wavelengths. More importantly, such a dispersion profile exhibits much smaller overall dispersion, thus making it possible to greatly reduce the pump power by five to six times.

关键词： Nonlinear optics four-wave mixing Kerr effect

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