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Low temperature sensitivity on-chip Fouriertransform spectrometer based on dual-layer Si_(3)N_(4)spiral waveguides

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Photonics Research 2023年第4期11卷 591-599页

作者： LIANGJUN LU HONGYI ZHANG XIN LI JIANPING CHEN Linjie ZHOU State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and Location ServicesDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu 314200China

On-chip Fourier-transform spectrometers(FTSs)based on Mach–Zehnder interferometer(MZI)arrays suffer from severe central wavelength and fringe contrast variation due to fabrication errors.Even though a calibration matrix can be employed to correctly retrieve the input spectra,environmental temperature variation greatly degrades the retrieving performance.In this paper,we devise a dual-layer Si_(3)N_(4) waveguide interferometer to reduce the temperature sensitivity.The beating of the even and odd supermodes in the dual-layer waveguide generates periodic intensity fluctuations in the spectrum.Since these two modes have similar modal profiles,their thermal sensitivity and propagation loss are relatively balanced,leading to a low temperature sensitivity and a high interference extinction ratio.We designed and fabricated a passive FTS based on a 32-channel dual-layer Si_(3)N_(4) waveguide array.Experimental results show that the temperature sensitivity is reduced to 10 pm/°C,which is almost half that of single-layer Si_(3)N_(4) MZI-based FTSs.With this chip,we accurately reconstructed various types of optical spectra,including single and two sparse laser lines,and broadband optical spectra.Our method can fit a wide wavelength range,which is a promising technology to improve the practical applications of on-chip FTSs.

关键词： waveguide interferometer layer

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 consumption.However,the large insertion loss,the high fabrication,and the temperature sensitivity hinder the scalability of silicon microring optical switch fabrics.In 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 fabrics.The 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 layer.The switch is calibration-free and has low insertion loss.With the 3D microring-based SEs,we implement an 8×8 crossbar optical switch fabric.As 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 control.The optical transmission spectra show a box-like shape,with a passband width of~69 GHz and an average on-state loss of~0.37 dB.The chip has a record-low on-chip insertion loss of 0.52-2.66 dB.We 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 degradation.To 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

Integrated terahertz vortex beam emitter for rotating target detection

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Advanced Photonics 2023年第6期5卷 37-46页

作者： Jingya Xie Jun Qian Tengjiao Wang Linjie ZHOU Xiaofei Zang Lin Chen Yiming Zhu Songlin Zhuang University of Shanghai for Science and Technology Terahertz Technology Innovation Research InstituteShanghai Key Laboratory of Modern Optical SystemShanghaiChina Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronic EngineeringShanghaiChina

We propose a terahertz(THz)vortex emitter that utilizes a high-resistance silicon resonator to generate vortex beams with various topological charges.Addressing the challenge of double circular polarization superposition resulting from the high refractive index contrast,we regulate the transverse spin state through a newly designed second-order grating partially etched on the waveguide’s top side.The reflected wave can be received directly by a linearly polarized antenna,simplifying the process.Benefiting from the tuning feature,a joint detection method involving positive and negative topological charges identifies and detects rotational Doppler effects amid robust micro-Doppler interference signals.This emitter can be used for the rotational velocity measurement of an on-axis spinning object,achieving an impressive maximum speed error rate of∼2%.This approach holds promise for the future development of THz vortex beam applications in radar target detection and countermeasure systems,given its low cost and potential for mass production.

关键词： vortex beam emitter terahertz rotational Doppler detection

Continuous-variable quantum key distribution with on-chip light sources

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Photonics Research 2023年第4期11卷 504-516页

作者： LANG LI TAO WANG XINHANG LI PENG HUANG YUYAO GUO LIANGJUN LU Linjie ZHOU GUIHUA ZENG State Key Laboratory of Advanced Optical Communication Systems and Networks Center for Quantum Sensing and Information ProcessingDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and Location ServicesDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu 314200China

Integrated quantum key distribution(QKD)systems based on photonic chips have high scalability and stability,and are promising for further construction of global quantum communications networks.On-chip quantum light sources are a critical component of a fully integrated QKD system;especially a continuous-variable QKD(CVQKD)system based on coherent detection,which has extremely high requirements for the light sources.Here,for what we believe is the first time,we designed and fabricated two on-chip tunable lasers for CV-QKD,and demonstrated a high-performance system based on these sources.Because of the high output power,fine tunability,and narrow linewidth,the involved on-chip lasers guarantee the accurate shot-noise-limited detection of quantum signals,center wavelength alignment of nonhomologous lasers,and suppression of untrusted excess noise.The system’s secret key rate can reach 0.75 Mb/s at a 50 km fiber distance,and the secure transmission distance can exceed 100 km.Our results mark a breakthrough toward building a fully integrated CV-QKD,and pave the way for a reliable and efficient terrestrial quantum-secure metropolitan area network.

关键词： quantum sources distribution

A design method for high fabrication tolerance integrated optical mode multiplexer

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Science China(Information Sciences) 2020年第6期63卷 184-194页

作者： Bitao SHEN Haowen SHU Linjie ZHOU Xingjun WANG State Key Laboratory on Advanced Optical Communication Systems and Networks Department of ElectronicsSchool of Electronics Engineering and Computer Science Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Nano-optoelectronics Frontier Center of Ministry of Education Peking University

The tapered asymmetric directional coupler has the potential to realize high fabrication tolerance and high transmission efficiency on-chip mode multiplexer. However, the geometry parameter selection of tapered structure remains empirical. In this paper, we propose a design method for the tapered structure based on genetic algorithm. Combined with the adjusted coupling equations and interpolation method, lowtime-cost optimization can be realized. Three mode multiplexers(TE0&TE1, TE0&TE2 and TE0&TE5)are designed by our method. According to simulation results, the insertion loss of the designed devices is lower than 1.8 dB and the crosstalk is lower than-15 dB when the fabrication error is within required range(±10 nm for TE0&TE2 and TE0&TE5, and ±20 nm for TE0&TE1) in the bandwidth of 1.5–1.6 μm. In addition, the entire optimization process takes only 2 h for each device, which is around the time cost of a single 3 D simulation.

关键词： mode multiplexer directional coupler taper structure coupled-mode theory genetic algorithm

Multi-party Energy Management of Energy Hub: A Hybrid Approach with Stackelberg Game and Blockchain

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Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 919-928页

作者： Nian Liu Lu Tan Linjie ZHOU Qifang Chen State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina School of Electrical Engineering Beijing Jiaotong UniversityBeijingChina

In an integrated energy distribution system(IEDS),an energy hub has been introduced and deemed to be a suitable tool for managing and integrating multi-party energy forms.Due to different energies having diverse characteristics and being coupled with each other,it is difficult for an energy hub to implement the optimal scheduling of multiple energy sources.Therefore,an energy optimization management model is proposed based on the Stackelberg game,which considers the exergy conversion of multi-party energy sources in different operation modes.The problem is solved by the two-layer distributed optimization algorithm,in which the energy hub acts as the leader and is followed by the users.Furthermore,in order to alleviate the deception,malicious tampering,subpeption,and other secure risks in energy trading,blockchain is introduced into the energy hub and the concept of exergy coin(EC)is proposed.A credit-based blockchain framework and concurrent block building consensus process is explored to reduce the calculation cost and promote the exergy trading efficiency.Finally,the case study shows how the proposed method can effectively optimize energy scheduling and configure a more reasonable energy solution.

关键词： Energy management Stackelberg game exergy coins(EC) exergy conversion blockchain

High-speed silicon microring modulator at the 2μm waveband with analysis and observation of optical bistability

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Photonics Research 2022年第3期10卷 I0001-I0008页

作者： Weihong Shen Gangqiang zhou Jiangbing Du Linjie ZHOU Ke Xu Zuyuan He Peng Cheng Laboratory Shenzhen 518055China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China Department of Electronic and Information Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Recently,significantly raised interests have emerged for the 2μm waveband as an extended new window for fiber optic communication.Much research progress has been made on the photonic integrated circuits for the 2μm waveband,especially on the CMOS-compatible silicon-on-insulator wafer.In this work,a silicon integrated microring modulator(MRM)with record high-speed performances at the 2μm waveband was demonstrated.An L-shaped PN junction was specially designed for 2μm to achieve a high modulation efficiency with V_(π)L of 0.85V·cm.The measured 3 dB bandwidth is 18 GHz,supporting up to 50 Gbps signaling at 2μm.Additionally,optical bistability induced by the thermo-optical effect and nonlinear effects was analyzed theoretically and observed experimentally in the 2μm MRM for the first time to our knowledge.Nonlinear coupled mode theory and the Runge-Kutta method were used to simulate the behaviors of bistability in the 2μm MRM.The simulation and experimental results indicate that,when the MRM is launched by a high optical power,the distorted resonant spectrum under an optical bistable state deteriorates the modulation efficiency and signal performances.This work breaks the record of high-speed silicon MRM at 2μm,drawing a promising prospect for the silicon photonic integration and high-speed interconnection at the 2μm waveband,and it provides the referenceable analysis of optical bistability,which guides the design and experimental investigation of 2μm MRM.

关键词： wave resonant distorted

Optical generation of UWB pulses utilizing Fano resonance modulation

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Frontiers of Optoelectronics 2021年第4期14卷 426-437页

作者： Zhe XU Yanyang zhou Shuhuang CHEN Liangjun LU Gangqiang zhou Jianping CHEN Linjie ZHOU State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and Location ServicesShanghai Institute for Advanced Communication and Data ScienceDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this paper,we reported an integrated method to generate ultra-wideband(UWB)pulses of different orders based on a reconfigurable silicon micro-ring resonator-coupled Mach–Zehnder interferometer.Under proper operating conditions,the device can produce Fano resonances with a peak-to-valley extinction ratio of above 20 dB.UWB monocycle and doublet signals with picosecond pulse widths are produced when the microring resonator is modulated by square and Gaussian electrical pulses,respectively.With our Fano resonance modulator on silicon photonics,it is promising to foresee versatile on-chip microwave signal generation.

关键词： ultra-wideband(UWB)generation Fano resonance intensity modulation integrated silicon modulator

如何提高乡村民宿创业绩效——地方认同与创业自我效能感机制研究

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Journal of Resources and Ecology 2024年第3期15卷 639-649页

作者：周琳杰殷平周文婧满丹彤北京交通大学经济管理学院北京100091 北京市平谷区南独乐河镇人民政府北京101212

民宿创业绩效机制的辨析对于提高农民收入、实现共同富裕、全面推进乡村振兴战略十分必要。本文构建了地方认同、创业自我效能感与农民民宿创业绩效之间关系的理论模型,收集了355份北京市民宿创业者的数据,运用Mplus软件进行路径分析和... 详细信息

民宿创业绩效机制的辨析对于提高农民收入、实现共同富裕、全面推进乡村振兴战略十分必要。本文构建了地方认同、创业自我效能感与农民民宿创业绩效之间关系的理论模型,收集了355份北京市民宿创业者的数据,运用Mplus软件进行路径分析和中介效应检验,实证验证了该理论模型。研究结果表明:地方认同对民宿创业绩效具有正向影响;创业自我效能感对民宿创业绩效有显著的正向影响;创业自我效能感在地方认同和农民民宿创业绩效的关系中发挥部分中介作用。该研究结论为乡村振兴背景下提高民宿创业绩效提供了理论基础,并且具有一定的管理实践意义。

关键词：乡村振兴乡村民宿地方认同创业自我效能感创业绩效