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Two-photon 3D printed spring-based Fabry-Pérot cavity resonator for acoustic wave detection and imaging

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Photonics Research 2023年第5期11卷 780-786页

作者： HEMING WEI ZHANGLI WU KEXUAN SUN HAIYAN ZHANG CHEN WANG KEMIN WANG TIAN YANG FUFEI PANG XIAOBEI ZHANG TINGYUN WANG SRIDHAR KRISHNASWAMY key laboratory of Specialty Fiber Optics and optical Access networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai UniversityShanghai 200444China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China state key laboratory of advanced optical communication systems and networks Key Laboratory for Thin Film and Microfabrication of the Ministry of EducationSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Center for Smart Structures and Materials Northwestern UniversityEvanstonIllinois 60208USA

optical fiber microresonators have attracted considerable interest for acoustic detection because of their compact size and high optical ***,we have proposed,designed,and fabricated a spring-based Fabry-Pérot cavity microresonator for highly sensitive acoustic *** observed two resonator vibration modes:one relating to the spring vibration state and the other determined by the point-clamped circular plate vibration *** found that the vibration modes can be coupled and optimized by changing the structure *** proposed resonator is directly 3D printed on an optical fiber tip through two-photon polymerization and is used for acoustic detection and *** experiments show that the device exhibits a high sensitivity and low noise equivalent acoustic signal level of 2.39 mPa∕Hz^(1∕2)at 75 kHz that can detect weak acoustic waves,which can be used for underwater object *** results demonstrate that the proposed work has great potential in acoustic detection and biomedical imaging applications.

关键词： resonator fiber cavity

Silicon-based optoelectronics:progress towards large scale optoelectronic integration and applications

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Frontiers of Optoelectronics 2022年第2期15卷 179-180页

作者： Dingshan Gao Zhiping Zhou Wuhan National laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China state key laboratory of advanced optical communication systems and networks School of ElectronicsPeking UniversityBeijing 100871China

In the past half century,silicon-based microelectronics and optical fiber communication have triggered a far-reaching information technology revolution,which has moved human society into a high-speed information *** demand for communication capacity and speed is growing *** the other hand,data center and high-performance computing are facing bottlenecks of speed,bandwidth,and energy consumption of electrical interconnections.

关键词： interconnection optoelectronic communication

Coherent optical OFDM scheme with inter-carrier interference self-cancellation and common phase error compensation

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Chinese Optics Letters 2010年第7期8卷 634-638页

作者：吴毅凌李巨浩赵春旭赵玉萍张帆陈章渊 state key laboratory of advanced optical communication systems & networks Peking University

Schemes integrating inter-carrier interference （ICI） self-cancellation and common phase error （CPE） com- pensation for coherent optical orthogonal frequency division multiplexing （CO-OFDM） systems are investi- gated. The purpose of our research is to counteract the impacts of laser phase noise and fiber nonlinearity. We propose two ICI self-cancellation-based CO-OFDM schemes, and adopt a pilot-aided decision feedback （DFB） loop for CPE compensation. The proposed schemes are compared with conventional CO-OFDM schemes at the same spectral efficiency. Simulations show that our schemes can not only enhance laser linewidth tolerance of the CO-OFDM system, but also present strong robustness against fiber nonlinearity.

关键词： Error compensation Frequency allocation Orthogonal functions Spectrum analyzers Telecommunication systems

Joint nonlinear electrical equalization in coherent optical PDM DFT-spread-OFDM systems

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Chinese Optics Letters 2013年第6期11卷 6-9页

作者：黄志远张帆陈章渊 state key laboratory of advanced optical communication systems and networks Peking University

We propose a joint nonlinear electrical equalization approach in coherent optical discrete-Fourier-transform spread orthogonal-frequency-division-multiplexing （DFT-sprea^-OFDM） systems with polarization divi- sion multiplexing （PDM）. This method is based on an adaptive Volterra series expansion for nonlinear distortions of two orthogonal polarizations. The nonlinear electrical equalization is validated through numerical simulation of 100-Gb/s quadrature phase shift keying and 200-Gb/s 16 quadrature amplitude modulation PDM DFT-spread-OFDM systems.

关键词： Multiplexing Nonlinear optics Telecommunication systems

Experimental study on resonance frequency enhancement of strong optical injection-locked semiconductor lasers

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Chinese Optics Letters 2013年第12期11卷 47-49页

作者：郭芃陈章渊 state key laboratory of advanced optical communication systems and networks Peking University

Enhancing resonance frequency of strong optical studied. Resonance frequency is increased from technique. We experimentally demonstrate that injection-locked semiconductor lasers is experimentally 4.1 to 53.9 GHz by the optical injection locking （OIL） resonance frequency is strictly equal to the frequency spacing between the cavity modes of the master and slave lasers under strong OIL condition. This result provides valuable information to improve OIL theory.

关键词： VCSEL Experimental study on resonance frequency enhancement of strong optical injection-locked semiconductor lasers

Experimental demonstration of multigranularity switching between optical DFT-spread-OFDM and Nyquist superchannel

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Chinese Optics Letters 2014年第11期12卷 21-25页

作者：丁瑞张婷婷张帆 state key laboratory of advanced optical communication systems & networks Peking University

We experimentally investigate multigranularity optical subband switching functionality between two superchannels with slight error vector magnitude penalty. One is 4×39 Gb/s polarization-division-multiplexed（PDM） quadrature phase shift keying discrete Fourier transform spread orthogonal frequency division multiplexing（DFT-spread-OFDM） superchannel with 12.5 GHz band spacing. The other is 8×29 Gb/s PDM-16-quadrature amplitude modulation Nyquist pulse shaping superchannel with 6.25 GHz band spacing. To the best of our knowledge, this is the first time that optical switching functionality for individual band between different superchannels with multigranularity is realized.

关键词： Amplitude modulation Discrete Fourier transforms Local area networks Phase shift Phase shifters Pulse shaping Quadrature amplitude modulation Quadrature phase shift keying

Proton radiation effects on high-speed silicon Mach-Zehnder modulators for space application

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Science China(Information Sciences) 2022年第12期65卷 301-312页

作者： Changhao HAN Zhaoyi HU Yuansheng TAO Engang FU Yandong HE Fenghe YANG Jun QIN Xingjun WANG state key laboratory of advanced optical communication systems and networks School of Electronics Peking University state key laboratory of Nuclear Physics and Technology School of Physics Peking University Institute of Microelectronics School of Integrated Circuits Peking University Peking University Yangtze Delta Institute of Optoelectronics Frontier Science Center for Nano-optoelectronics Peking University Peng Cheng laboratory

In this paper, performance degradation effects on high-speed silicon Mach-Zehnder modulators under proton radiation were investigated for future space environment applications. The test devices were exposed to 3-MeV protons of three fluence levels(5×1013, 2×1014, and 5×1015ions/cm2), which is comparable to the radiation amount for operating in a harsh space environment after several decades. The performance of the silicon modulator after radiation was characterized in terms of modulation efficiency and eye *** results illustrate that the modulation efficiency is significantly reduced after proton radiation and shows an obvious decrease with increasing radiation fluence. The extinction ratios of the on-off keying(OOK) eye diagram are obviously dropped with increasing radiation fluence and correspond well to modulation efficiency degradation. Furthermore, three representative states for data transmission are demonstrated under three fluences, from still working to the critical state and eventually complete fail. Displacement damage and ionization damage are the two major mechanisms during proton radiation, which lead to the bulk defects and accumulating defect charges and cause performance degradation of silicon Mach-Zehnder modulators.

关键词： silicon Mach-Zehnder modulator proton radiation space application silicon photonics optical communication

Bidirectional radio-over-fiber systems with SSB modulation and wavelength reuse based on injection-locked semiconductor lasers

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Chinese Optics Letters 2010年第11期8卷 1040-1042页

作者：洪成张诚段俊胡薇薇徐安士陈章渊 state key laboratory of advanced optical communication systems and networks Peking University

A 60-GHz bidirectional radio-over-fiber （RoF） system using two-carrier-injected distributed feedback （DFB） laser is proposed and demonstrated to realize optical single sideband （SSB） modulation for *** injection-locked Fabry-P＇erot laser is also carried out to realize wavelength reuse in *** of 2.5 Gb/s on a 60-GHz carrier for downlink and 622-Mb/s baseband signal for uplink are both successfully demonstrated over 50-km single mode fiber without chromatic dispersion compensation.

关键词： Electromagnetic dispersion Feedback Lasers Single mode fibers

Solving characteristic equation of orbital angular momentum modes in a ring fiber

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Chinese Optics Letters 2015年第3期13卷 1-5页

作者：朱逸萧张帆 state key laboratory of advanced optical communication systems and networks Peking University

The characteristic equation of orbital angular momentum modes in a ring fiber is derived. By solving the equation with the graphical method, mode distribution in a ring fiber can be precisely determined for arbitrary fiber parameters without relying on simulation of the vector field. This will provide a useful method to determine the separation between quasi-degenerate modes in a ring fiber.

关键词： Angular momentum