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40-Gb/s all-optical digital 4-bit priority encoder employing cross-gain modulation in semiconductor optical amplifiers

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Chinese Science Bulletin 2012年第10期57卷 1204-1208页

作者： LEI Lei DONG JianJi zhang Yin YU Yu zhang xinliang Wuhan National Laboratory for Optoelectronics and the School of Optoelectronic Science and Engineering Huazhong University of Science andTechnology Wuhan 430074 China

High-speed all-optical logic circuits have attracted much attention because of their important roles in signal processing in next-generation optical *** digital encoder is widely used in binary calculation,multiplexing,demultiplexing,address recognition and data encryption.A priority encoder allows the existence of multiple valid inputs simultaneously,identifies the priority of the request signals and encodes the *** propose and experimentally demonstrate an all-optical 4-bit priority encoder for return-to-zero signals at 40 Gbit/s based on cross-gain modulation in semiconductor optical *** fil-ters after semiconductor optical amplifiers are employed to improve the output *** logic bit sequences and clear open eye patterns with extinction ratios exceeding 10 dB are achieved.

关键词：半导体光放大器优先编码器交叉增益调制全光 Gb 信号处理下一代光网络逻辑电路

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Simulation for all-optical format conversion from NRZ-DPSK to RZ-DPSK

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Frontiers of Optoelectronics 2011年第3期4卷 320-324页

作者： Zheng zhang Yu YU xinliang zhang Wuhan National Laboratory for Optoelectronics College of Optoelectronic Science and EngineeringHuazhong University of Science and Technology

We propose and simulate a simple scheme of all-optical format conversion from non-return-to-zero differential phase-shift keying(NRZ-DPSK) to return-tozero differential phase-shift keying(RZ-DPSK) by using phase modulators and detuning filters. The operation principle is theoretically analyzed and simulated by exploiting spectra, temporal waveform and eye diagram with commerical optical design software VPI Transmission Maker 8.5. The use of electrical clock recovery and linear phase modulation in the conversion scheme may be potiental in practise use.

关键词： format conversion differential phase-shift keying (DPSK) all-optical processing

All-optical ultra-wideband pulse generation based on semiconductor optical amplifiers

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Frontiers of Optoelectronics 2009年第1期2卷 40-49页

作者： Jianji DONG xinliang zhang Dexiu HUANG Wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and Engineering Huazhong University of Science and Technology

Several all-optical methods for ultra-wideband(UWB) pulse generation based on various nonlinearities of single semiconductor optical amplifiers(SOAs), namely cross phase modulation(XPM), cross gain modulation(XGM), and a hybrid of self phase modulation(SPM) and XGM, have been demonstrated. In the first method, UWB doublet pulses are realized with XPM. The input optical Gaussian pulse will be converted to two polarity-reversed monocycle pulses by a blue shifted and a red shifted optical bandpass filters respectively. These two monocycle pulses are then combined with proper time delay to generate two polarity-reversed doublet pulses. Second, two polarityreversed monocycle pulses are obtained based on XGM of the SOA and group delay of the single mode fiber(SMF).In the scheme, two polarity-reversed Gaussian pulses are generated due to XGM, and then the mixed signal is converted to a monocycle shape due to the group delay of the SMF. Finally, we present UWB doublet generation based on SPM. The monocycle pulse is generated from a dark return-to-zero(RZ) signal and converted to a doublet pulse by injecting an additional probe signal with the SMF transmission. For the first time and to the best of our knowledge, we report that the generated doublet pulses are transmitted over 5 km SMF by proper dispersion compensation without distortion. The configuration of our alloptical methods is compact and simple. The feasibility to implement the pulse shape modulation and pulse polarity modulation is discussed.

关键词： microwave photonics ultra-wideband (UWB) semiconductor optical amplifier (SOA) all-optical microwave signal processing

Q value analysis of microwave photonic filters

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Frontiers of Optoelectronics 2009年第3期2卷 269-278页

作者： Lina ZHOU xinliang zhang Enming XU Department of Physics China University of Geosciences Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology

This paper first presents the fundamental principles of the microwave photonic filters. As an example to explain how to implement a microwave photonic filter, a specific finite impulse response(FIR)filter is illustrated. Next, the Q value of the microwave photonic filters is analyzed theoretically, and methods around how to gain high Q value are discussed. Then,divided into FIR filter, first-order infinite impulse response(IIR) filter, and multi-order IIR filter, several novel microwave photonic filters with high Q value are listed and compared. The technical difficulties to get high Q value in first-order IIR filter and multi-order IIR filter are analyzed concretely. Finally, in order to gain higher Q value, a multi-order IIR microwave photonic filter that easily extends its order is presented and discussed.

关键词： microwave photonic filters finite impulse response (FIR) filter first-order infinite impulse response (IIR) filter multi-order infinite impulse response (IIR) filter high Q value

Linear optical signal processing with optical filters： a tutorial

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Frontiers of Optoelectronics 2016年第3期9卷 377-389页

作者： xinliang zhang Zhao WU Wuhan National Laboratory for Optoelectronics (WNLO) School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China

An effective theoretical analysis method is presented to analyze different linear optical signal processing functions with optical fikers reported in literatures. For different applications, the optical filters are supposed to operate on the analog or digital part of the signal separately, namely analog spectrum conversion and digital spectrum conversion. For instance, the return-to-zero （RZ） to non-return-to-zero （NRZ） format conversion for intensity or phase modulated signals are based on the analog spectrum conversion process, while the （N）RZ to （N）RZ phase-shift-keying （PSK） format conversion, logic NOT gate and clock recovery for RZ signals are based on the digital spectrum conversion process. Theoretical analyses with the help of numerical simulation are used to verify the reported experimental results, and all the experimental results can be effectively analyzed with this analytical model. The effect of the transmission spectrum of the filter on the performance of the converted signal is investigated. The most important factor is that the theoretical analysis provides an effective way to optimize the optical filter for different optical signal processing functions.

关键词： linear optical signal processing format conversion optical filter clock recovery logic gate

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Rigid Dysprosium(Ⅲ)Single-Molecule Magnets Exhibit Preserved Superparamagnetism in Solution

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Chinese Journal of Chemistry 2022年第5期40卷 563-570页

作者： Xiali Ding Qiancheng Luo Yuanqi Zhai Xufeng zhang Yi Lv xinliang zhang Chao Ke Chao Wu Yanzhen Zheng Frontier Institute of Science and Technology(FIST) State Key Laboratory of Mechanical Behavior for MaterialsMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi'an Key Laboratory of Sustainable Energy and Materials ChemistrySchool of Chemistry and School of PhysicsXi'an Jiaotong University99 Yanxiang RoadXi'anShaanxi710054 China Department of Hepatobiliary Surgery and The First Affiliated Hospital of Xi'an Jiaotong University 277 West Yanta RoadXi'anShaanxi710061 China Department of Spine Surgery Honghui HospitalXi'an Jiaotong University76 Nanguo RoadXi'anShaanxi710054 China Department of Orthopaedics and Trauma Hong Hui HospitalCollege of MedicineXi'an Jiaotong University555 East Youyi RoadXi'anShaanxi710054 China

Molecules with long preserved magnetic moments are perceived as the smallest units for storing bytes,which could bring a new revolution for information ***,the rational design of such molecules remains *** two rigid adamantanol ligand based dysprosium(III)complexes([Dy(1-AdO)_(2)(py)_(5)]BPh_(4)-1 and[Dy(2-AdO)_(2)(py)_(5)]BPh_(4)-2)with pentagonal-bipyramidal coordination geometry and local D5h symmetry were successfully prepared,which display excellent single-molecule magnet(SMM)behavior(U_(eff)≈1835 K,T_(B)_(ZFC)≈24 K,T_(B)^(100s)≈17 K and T_(B)^(H)=23 K for 1;U_(eff)≈1756 K,T_(B)^(ZFC)≈20 K,T_(B)^(100s)≈16 K and T_(B)^(H)=23 K for 2)due to the much weakened vibration in low energy ***,the large energy barriers and high blocking temperatures for these two complexes in solid states are well preserved in *** is never observed in previous studies of SMMs,indicating that the adamantanol is rigid and can be introduced to make the composed molecules stable enough to maintain the solid state magnetic property in solution.

关键词： Molecularmagnets Lanthanide D_(sh)-symmetry Superparamagnetism Solution

Experimental investigation on slow light via four-wave mixing in semiconductor optical amplifier

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Frontiers of Optoelectronics 2009年第3期2卷 259-263页

作者： Yin zhang xinliang zhang Xi HUANG Cheng CHENG Wuhan National Laboratory for Optoelectronics College of Optoelectronic Science and Engineering Huazhong University of Science and Technology

Optical buffer is a key component in all optical information processing systems. Slow light at room temperature via four-wave mixing(FWM) in semiconductor optical amplifier(SOA) is experimentally *** delay of 0.40 ns is achieved for a sinusoidal modulation signal at 0.1 GHz, corresponding to a delay bandwidth product(DBP) of 0.04. Factors that affect the experimental results are discussed. It is found out that the variable optical delay via FWM in SOA can be controlled either electrically by changing the SOA bias or optically by varying the pump power or pump-probe detuning.

关键词： optical communication slow light four-wave mixing (FWM) semiconductor optical amplifier (SOA)

Performance improvement by enhancing the well-barrier hole burning in a quantum well semiconductor optical amplifier

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Frontiers of Optoelectronics 2016年第3期9卷 353-361页

作者： Tong CAO xinliang zhang Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China

In this paper, we demonstrated a novel physical mechanism based on the well-barrier hole burning enhancement in a quantum well （QW） semiconductor optical amplifier （SOA） to improve the operation performance. To completely characterize the physical mechanism, a complicated theoretical model by combining QW band structure calculation with SOA＇s dynamic model was constructed, in which the carrier transport, interband effects and intraband effects were all taken into account. The simulated results showed optimizing the thickness of the separate confinement heterostructure （SCH） layer can effectively enhance the well-barrier hole burning, further enhance the nonlinear effects in SOA and reduce the carrier recovery time. At the optimal thickness, the SCH layer can store enough carrier numbers, and simultaneously the stored carriers can also be fast and effectively injected into the QWs.

关键词： nonlinear optics semiconductor optical amplifier optical signal processing (SOA)

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On-chip photonic spatial-temporal descrambler

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Chip 2023年第2期2卷 1-7页

作者： Wenkai zhang Xueyi Jiang Wentao Gu Junwei Cheng Hailong Zhou Jianji Dong Dongmei Huang xinliang zhang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Photonics Research Institute Department of Electrical EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China

As an indispensable part to compensate for the signal crosstalk in fiber communication systems,conventional digital multi-input multi-output(MIMO)signal processor is facing the challenges of high com-putational complexity,high power consumption and relatively low processing *** optical MIMOenables the best use of light and has been proposed to remedy this ***,the currently existing optical MIMO methods are all restricted to the spatial di-mension,while the temporal dimension is ***,an on-chip spatial-temporal descrambler with four channels were devised and its MIMO functions were experimentally verified simultaneously in both spatial and temporal *** spatial crosstalk of single-channel descrambler and four-channel descrambler is respectively less than-21 dB and-18 dB,and the time delay is simultaneously com-pensated ***,a more universal model extended to mode-dependent loss and gain(MDL)compensation was further de-veloped,which is capable of being cascaded for the real optical trans-mission *** first attempt at photonic spatial-temporal de-scrambler enriched the varieties of optical MIMO,and the proposed scheme provided a new opportunity for all-optical MIMO signal pro-cessing.

关键词： Optical signal processing Photonic integrated circuits Opti-cal MIMO Optical matrix computing