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Ultra-low-loss multi-layer 8×8 microring optical switch

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Photonics Research 2023年第5期11卷 712-723页

作者： XIN LI WEI GAO LIANGJUN LU JIANPING CHEN LINJIE ZHOU State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and LocationServicesShanghai Institute for Advanced Communication and Data ScienceDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu 314200China

microring-based optical switches are promising for wavelength-selective switching with the merits of compact size and low power ***,the large insertion loss,the high fabrication,and the temperature sensitivity hinder the scalability of silicon microring optical switch *** this paper,we utilize a three-dimensional(3D)microring-based optical switch element(SE)on a multi-layer Si_(3)N_(4)-on-SOI platform to realize highperformance large-scale optical switch *** 3D microring-based SE consists of a Si∕Si_(3)N_(4) waveguide overpass crossing in the bottom and the top layers,and Si_(3)N_(4) dual-coupled microring resonators(MRRs)in the middle *** switch is calibration-free and has low insertion *** the 3D microring-based SEs,we implement an 8×8 crossbar optical switch *** the resonance wavelengths of all SEs are well aligned,only one SE needs to be turned on in each routing path,which greatly reduces the complexity of the switch *** optical transmission spectra show a box-like shape,with a passband width of~69 GHz and an average on-state loss of~0.37 *** chip has a record-low on-chip insertion loss of 0.52-2.66 *** also implement a non-duplicate polarization-diversity optical switch by using the bidirectional transmission characteristics of the crossbar architecture,which is highly favorable for practical applications.100 Gb/s dual-polarization quadrature-phase-shift-keying(DP-QPSK)signal is transmitted through the switch without significant *** the best of our knowledge,this is the first time that 3D MRRs have been used to build highly scalable polarization-diversity optical switch fabrics.

关键词： polarization microring optical

Highly reliable integrated W-band transmitter based on an on-chip dual-mode DFB laser and cascaded microring modulators

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光子学研究:英文版 2023年第8期11卷 1431-1436页

作者： XUYING LIU WENJIA ZHANG YUE JIANG HAN WANG DAN LU FAN YANG ZUYUAN HE State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Semiconductor Material Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China

We propose an integrated W-band transmitter enabled by an integrated dual-mode distributed feedback(DFB)laser and cascaded silicon photonic microring modulators for next-generation wireless communication.10 Gb/s error-free intensity modulation and direct detection W-band transmission are achieved in experiments by using the dual-mode DFB laser and two free-running ***,we conduct an experiment of dual-carrier modulation based on cascaded microring modulators,achieving 3 dB signal-to-noise ratio improvement and better signaling integrity for wireless *** proposed photonic integrated W-band transmitter will be a viable solution for a high-speed and low-power wireless communication system.

关键词： Gb/s cascaded microring

240 Gb/s optical transmission based on an ultrafast silicon microring modulator

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Photonics Research 2022年第4期10卷 1127-1133页

作者： YUGUANG ZHANG HONGGUANG ZHANG JUNWEN ZHANG JIA LIU LEI WANG DAIGAO CHEN NAN CHI XI XIAO SHAOHUA YU State Key Laboratory of Optical Communication Technologies and Networks China Information and Communication Technologies Group Corporation(CICT)Wuhan 430074China National Information Optoelectronics Innovation Center Wuhan 430074China Key Laboratory of Information Science of Electromagnetic Waves(MoE) Fudan UniversityShanghai 200433China Peng Cheng Laboratory Shenzhen 518055China

An ultrafast microring modulator(MRM) is fabricated and presented with V_(π)· L of 0.825 V · cm. A 240 Gb/s PAM-8 signal transmission over 2 km standard single-mode fiber(SSMF) is experimentally demonstrated. PN junction doping concentration is optimized, and the overall performance of the MRM is improved. Optical peaking is introduced to further extend the EO bandwidth from 52 to 110 GHz by detuning the input wavelength. A titanium nitride heater with 0.1 nm/m W tuning efficiency is implemented above the MRM to adjust the resonant wavelength. High bit rate modulations based on the high-performance and compact MRM are carried out. By adopting off-line signal processing in the transmitter and receiver side, 120 Gb/s NRZ, 220 Gb/s PAM-4, and240 Gb/s PAM-8 are measured with the back-to-back bit error ratio(BER) of 5.5 × 10^(-4), 1.5 × 10^(-2), and 1.4 × 10^(-2), respectively. A BER with different received optical power and 2 km SSMF transmission is also investigated. The BER for 220 Gb/s PAM-4 and 240 Gb/s PAM-8 after 2 km SSMF transmission is calculated to be 1.7 × 10^(-2), and 1.5 × 10^(-2), which meet with the threshold of soft-decision forward-error correction,respectively.

关键词： Gb/s modulator microring

Self-calibrating microring synapse with dual-wavelength synchronization

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Photonics Research 2023年第2期11卷 347-356页

作者： JUNWEI CHENG ZHENMING HE YUHAO GUO BO WU HAILONG ZHOU TEYAN CHEN YIXIN WU WENWEI XU JIANJI DONG XINLIANG ZHANG Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China Galileo Advanced Technology Lab Huawei TechnologiesShenzhen 518129China Institute of Strategic Research Huawei TechnologiesShenzhen 518129China

As a resonator-based optical hardware in analog optical computing, a microring synapse can be straightforwardly configured to simulate the connection weights between neurons, but it faces challenges in precision and stability due to cross talk and environmental perturbations. Here, we propose and demonstrate a self-calibration scheme with dual-wavelength synchronization to monitor and calibrate the synaptic weights without interrupting the computation tasks. We design and fabricate an integrated 4 × 4 microring synapse and deploy our self-calibration scheme to validate its effectiveness. The precision and robustness are evaluated in the experiments with favorable performance, achieving 2-bit precision improvement and excellent robustness to environmental temperature fluctuations(the weights can be corrected within 1 s after temperature changes 0.5°C). Moreover, we demonstrate matrix inversion tasks based on Newton iterations beyond 7-bit precision using this microring synapse. Our scheme provides an accurate and real-time weight calibration independently parallel from computations and opens up new perspectives for precision boost solutions to large-scale analog optical computing.

关键词： synchronization microring resonator

Characterization of field-effect mobility at optical frequency by microring resonators

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Photonics Research 2021年第4期9卷 615-621页

作者： Wei-Che Hsu Erwen Li Bokun Zhou Alan X.Wang School of Electrical Engineering and Computer Science Oregon State UniversityCorvallisOregon 97331USA

A novel characterization method is proposed to extract the optical frequency field-effect mobility(μ_(op,FE))of transparent conductive oxide(TCO)materials by a tunable silicon microring resonator with a heterogeneously integrated titanium-doped indium oxide(ITiO)/SiO_(2)/silicon metal–oxide–semiconductor(MOS)*** operating the microring in the accumulation mode,the quality factor and resonance wavelength shift are measured and subsequently used to derive the𝜇op,FE in the ultra-thin accumulation *** results demonstrate that the μ_(op,FE) of ITiO increases from 25.3 to 38.4 cm2⋅V^(−1)⋅s^(−1) with increasing gate voltages,which shows a similar trend as that at the electric frequency.

关键词： microring optical mobility

Ultrawide-band silicon microring avalanche photodiode with linear photocurrent-wavelength response

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Photonics Research 2021年第11期9卷 2303-2308页

作者： YANG REN VIEN VAN Department of Electrical and Computer Engineering University of AlbertaEdmontonAlberta T6G 2W3Canada

We report a CMOS-compatible silicon microring-enhanced avalanche photodiode based on linear defect-state absorption in a p^(+)pn^(+) junction,with high responsivities exceeding 1 A/W at telecommunication *** large photogenerated currents give rise to giant thermo-optic nonlinearity in the microring resonator,resulting in a linear photocurrent-wavelength response spanning the full free spectral range of the *** unique photocurrent spectrum could enable novel applications in wavelength-resolved photodetection,such as compact on-chip spectrometers,linear chirp frequency laser source characterization,and low-cost refractometric sensors without requiring precise wavelength-tunable lasers.

关键词： microring avalanche resonator

Proposal and demonstration of a controllable Q factor in directly coupled microring resonators for optical buffering applications

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Photonics Research 2021年第10期9卷 2006-2015页

作者： YING ZHANG QIANG LIU CHENYANG MEI DESHENG ZENG QINGZHONG HUANG XINLIANG ZHANG Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Optical resonators with controllable Q factors are key components in many areas of optical physics and *** propose and investigate a Q-factor controllable system composed of two directly coupled microring resonators,one of which is tunable and coupled to dual *** shifting the resonance of the controllable microring,the Q factor of the system as well as the other microring changes *** have demonstrated wide-range controllable Q factors based on this structure in silicon-on-insulator,for *** influences of spectral detuning and coupling strength between two resonators on the variation of Q factors are studied in detail ***,we explore its applications in optical *** fast-to-slow/slow-to-fast light has been carried out by switching the system between the high-Q state and low-Q ***,optical pulse capture and release are also achievable using this structure with dynamic tuning,and the photon storage properties are *** proposed Q-factor tunable system is simple,flexible,and realizable in various integrated photonic platforms,allowing for potential applications in on-chip optical communications and quantum information processing.

关键词： microring optical tuning

Improving the spectral purity of single photons by a single-interferometer-coupled microring

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Chinese Physics B 2022年第3期31卷 311-315页

作者：王洋朱枰谕薛诗川刘英文吴俊杰杨学军徐平 Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410013China

We experimentally engineer a high-spectral-purity single-photon source using a single-interferometer-coupled silicon microring. By the reconfiguration of the interferometer, different coupling conditions can be obtained, corresponding to different quality factors for the pump and signal/idler. The ratio between the quality factor of the pump and signal/idler ranges from 0.29 to 2.57. By constructing the signal–idler joint spectral intensity, we intuitively demonstrate the spectral correlation of the signal and idler. As the ratio between the quality factor of the pump and signal/idler increases, the spectral correlation of the signal and idler decreases, i.e., the spectral purity of the signal/idler photons increases. Furthermore,time-integrated second-order correlation of the signal photons is measured, giving a value up to 94.95 ± 3.46%. Such high-spectral-purity photons will improve the visibility of quantum interference and facilitate the development of on-chip quantum information processing.

关键词： spectral-purity microring asymmetric Mach–Zehnder interferometer

A novel structure of silicon-on-insulator microring biosensor based on Young's two-slit interference and its simulation

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Journal of Semiconductors 2011年第7期32卷 57-61页

作者：苏保青王春霞阚强李俊华解意洋王真真陈弘达 State Key Laboratory Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences

A novel silicon-on-insulator microring biosensor based on Young＇s twoslit interference has been demonstrated. The transducer signal from electric field intensity distribution on the interference screen is given by using the transfer matrix method（TMM） and two-slit interference *** result shows that the structure we propose is advantageous for sensing as the interference pattern is very sensitive to the ambient refractive index around the microring.A small perturbation in refractive index around the microring△n_c will result in a notable shift of destructive interference points（DIPs） on the interference *** detecting the shift of the DIPs,the ambient refractive index change can be obtained.

关键词： silicon-on-insulator microring Young's two-slit interference biosensor