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All-fiber high-resolution computational spectropolarimeter based on speckle pattern

Chinese Optics Letters 2024年第12期22卷 95-100页

作者： Qianyu Zhou Yangyang Wan Xinyu Fan Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

The lightwave field possesses several dimensional properties,including amplitude,spectrum,phase,and *** measurements of lightwaves have diverse applications ranging from remote sensing to analytical ***,achieving high-resolution simultaneous multi-dimensional measurement of lightwaves remains *** this work,we demonstrate an all-fiber spectropolarimeter based on a speckle pattern obtained from the end of a multi-mode *** proposed system simultaneously achieves a spectral resolution of 100 pm and a polarization resolution of *** polarization measurement errors for three Stokes parameters are 3.37%,1.01%,and 0.84%,respectively,with a mean squared error of 5.3×10^(-5).This work provides novel potential for high-resolution and accurate multi-dimensional lightwave field measurements.

关键词： spectropolarimeter speckle pattern multi-mode fiber

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Design of an augmented reality display based on polarization grating

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Chinese Physics B 2019年第7期28卷 216-221页

作者： Renjie Xia Changshun Wang Yujia Pan Tianyu Chen Ziyao Lyu Lili Sun State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong University

A new optical system for an augmented reality(AR) display is proposed in this *** optical system mainly includes a ray deflector, coupling input grating, optical waveguide, and coupling output *** the ray deflector and the coupling input grating are designed based on the diffraction characteristics of the polarization grating, and the coupling output grating is the Bragg reflection *** with other AR schemes, this AR optical system not only reduces the number of projections from two to one, but also improves the efficiency of light coupling into the optical *** energy loss is reduced by utilizing the single-order diffraction characteristics of the polarization grating in its coupling input *** light deflector uses the polarization selectivity of the polarization grating and the characteristics of the rotating light of the twisted nematic liquid crystal layer to realize beam *** working principle of the optical system is experimentally and theoretically demonstrated.

关键词： augmented reality polarization grating azo liquid crystal

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A new method for extending rate equation based VCSEL model with multimode spectral characteristic

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Science China(Information Sciences) 2018年第12期61卷 155-162页

作者： Anzhong LIANG Chuanchuan YANG Cheng ZHANG Jingjing SONG Hongbin LI State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

An accurate VCSEL model is important to evaluate the performance of VCSEL-based high speed short range optical interconnect system. Current VCSEL models show no evidence of the multimode spectral characteristic, which leads to an inaccurate performance estimation of VCSEL-based high speed optical interconnect system especially with large chromatic dispersion. To overcome this problem, we propose a new method to introduce multimode spectral characteristic into current VCSEL models, which extends the spatiotemporal multimode rate equations by calculating the wavelength shift of the VCSEL transverse modes. A VCSEL-multimode fiber(MMF) based short range optical interconnect simulation system is then built using our modified VCSEL model by VPItransmissionMaker. The symbol broadening and the BER performance of 15 Gb/s NRZ signal are tested in both left-tilted differential mode delay(DMD) profile MMF(L-MMF) and right-tilted DMD profile MMF(R-MMF). Simulation results validate our proposed method and indicate that the spectral characteristic is a key component for VCSEL models.

关键词： short-range optical interconnect vertical cavity surface emitting lasers VCSEL multimode rate equations multimode spectral characteristic multimode fiber

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Pseudo pilot-aided OFDM system with high spectral efficiency for high performance coaxial transmission

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Science China(Information Sciences) 2017年第6期60卷 191-199页

作者： Yue LIU Chuanchuan YANG Hongbin LI State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

High performance network over coax(HINOC) has become next-generation broadcasting network(NGB) industry standard of China, as well as International Telecommunication Union(ITU) telecommunication standard, which adopts orthogonal frequency division multiplexing(OFDM) technique and high order modulation formats. As is known, in OFDM system, phase noise destroys the orthogonality of the subcarriers and degrades the performance of the system especially when the data are transmitted in high order modulation formats. In this paper, we propose a high spectral efficiency OFDM system utilizing a novel and almost blind phase noise compensation method mainly used for high performance coaxial transmission. In our system, some subcarriers, which remain to transmit unknown useful data in lower order modulation formats, are selected as pseudo pilots instead of pilots to suppress phase noise effectively and high spectral efficiency can be achieved with the aid of puncturing mechanisms. Simulation results show that the proposed pseudo pilot-aided OFDM system can achieve the performance of the pilot-aided counterpart yet acquiring higher spectral efficiency.

关键词： orthogonal frequency division multiplexing(OFDM) high performance network over coax(HINOC) phase noise pseudo pilots broadcasting

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Error correction for short-range optical interconnect using COTS transceivers

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Science China(Information Sciences) 2019年第6期62卷 72-78页

作者： Ziyuan ZHENG Chuanchuan YANG Dan ZHAO Ziyu WANG State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

Nowadays, quantities of commercial off-the-shelf(COTS) optical transceivers are widely equipped in both exiting and abuilding data centers. As data centers are becoming larger and containing more servers, the method to ensure longer and steady transmission with COTS optical transceivers becomes one of the key issues. Meanwhile, variations in the manufacturing of COTS optical transceivers bring in fluctuation of packet error rate(PER) in communication. In this paper, we present an application layer adaptive forward error correction(AL-AFEC) coding scheme for COTS optical transceivers in optical interconnect to solve the problems mentioned above and test its performance in a 10 Gbps Ethernet(10 GbE)link using 10 GBASE-SR SFP+ modules. Experimental results show that the proposed scheme enables longer transmission distance and the instability introduced by manufactural variations is well settled. Since our scheme requires no extra hardware on optical transceivers, it is a considerable low-cost alternative to improve system reliability and achieve longer transmission distance for COTS optical transceivers.

关键词： short-range optical interconnect vertical cavity surface emitting laser(VCSEL) ethernet application layer adaptive forward error correction commercial off-the-shelf optical transceiver

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Pioneering Air-Ground Integrated Mobility: A Knowledge-Driven Space-Air-Ground Integrated Network for 6G On-Demand Service

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IEEE Network 2025年

作者： Sha, Zifan Li, Changle Yue, Wenwei Cheng, Nan Hui, Yilong Pang, Aoyu Pun, Man-On Sun, Zhili Yang, Yang Xidian University State Key Laboratory of Integrated Services Networks Shaanxi Xi'an China Xidian University Research Institute of Smart Transportation Shaanxi Xi'an China Shenzhen China University of Surrey Institute of Communication Systems GuildfordGU27XH United Kingdom Guangzhou China Peng Cheng Laboratory Shenzhen China Terminus Group Beijing China

In order to improve the bearing capacity of current transportation system and the efficiency of production and living, it is imperative to construct a new type of transportation system combined with the near-ground space (NGS), among which the air-ground integrated mobility (AIM) is a typical representative in 6G era. However, in catering to the extensive AIM services with customized requirements, there is an urgent need for the support of novel network architectures endowed with the capabilities of network collaboration and endogenous intelligence. In light of this, we propose a knowledge-driven space-air-ground integrated network architecture for AIM (AIM-SAGIN), which divides into six network layers and integrates multi-tier AI controllers for achieving efficient collaboration. Moreover, this article presents the knowledge-driven logical network structure for AIM-SAGIN. Specifically, we add the knowledge plane to conventional planes, aiming at enhancing the awareness and optimization of intergrated sensing, communication, computing, and control (ISCCC) strategies for AIM control. Besides, a digital management and control platform for AIM services is constructed, which can realize the real-time mapping of digital domain and on-demand strategies for AIM-SAGIN. In addition, simulations are conducted to verify system end to end delay and service satisfaction rate of AIM-SAGIN, which demonstrates the performance gains brought by network collaboration with knowledge and AI controllers, as well as reveals the balance between transmission efficiency and computational complexity. Finally, we discuss some useful enabling technologies and open challenges for AIM-SAGIN. © 1986-2012 IEEE.

关键词： Efficiency

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Deep belief network-hidden Markov model based nonlinear equalizer for VCSEL based optical interconnect

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Science China(Information Sciences) 2020年第6期63卷 155-163页

作者： Fukui TIAN Chuanchuan YANG State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

The data center has developed rapidly over the past few years, leading to the demand for high speed data transmission. Vertical cavity surface emitting lasers(VCSELs) based optical interconnect is evolving to 100 Gb/s and beyond, which makes nonlinear distortions difficult to be compensated or equalized by conventional equalizers. Moreover, the challenge becomes very complicated for conventional equalizers because of the presence of inter-symbol interference(ISI) together with the nonlinear distortions. So many neural network based DSP algorithms such as artificial neural network(ANN) have been proposed to mitigate the distortions. However, ANN has the limitations that sample's relevant information is not considered,leading to degradation in ANN's performance and high computational complexity. In this paper, in order to maintain an excellent capability of mitigating nonlinear distortions like other neural network based equalizers while considering the sample's relevant information to reduce the computational complexity, we propose a deep belief network-hidden Markov model(DBN-HMM) based nonlinear equalizer which is tested in a PAM-4 modulated VCSEL and multimode fiber(MMF) optical interconnect link experimentally. The BER performance can be greatly improved compared with conventional DSP algorithms. In addition, the computational complexity of DBN-HMM based equalizer can be about 41% lower than that of ANN based method with a similar BER performance.

关键词： short-range optical interconnect vertical cavity surface emitting laser(VCSEL) nonlinear equalizer deep belief network(DBN) hidden Markov model(HMM)

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Analysis of IPACT network performance considering channel switch latency for WDM-EPON

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Chinese Optics Letters 2011年第6期9卷 24-27页

作者：周钊肖石林朱敏毕美华 State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiaotong University

In wavelength-division multiplexing （WDM） ethernet passive optical networks （EPONs）, to realize the statistical multiplexing of upstream wavelength resources, some optical tunable components are introduced in the optical network units. However, the switch latency （SL） of these tunable components constrains the performance of WDM-EPON. In this letter, we extend the mathematical model of the WDM interleaved polling with adaptive cycle time （IPACT） scheme by additionally considering the SL conditions. We also investigate the effect of channel SL on network performance. The simulation results show that the performance of WDM-IPACT-SL deteriorates as the SL increases.

关键词： Ethernet Ethers Fiber optic networks Mathematical models Multiplexing Multiplexing equipment Network performance Switching circuits

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Splitting the surface wave in metal/dielectric nanostructures

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Chinese Physics B 2011年第6期20卷 469-473页

作者：祝颂吴坚 Department of Physics State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

We investigate a modified surface wave splitter with a double-layer structure, which consists of symmetrical metallic grating and an asymmetrical dielectric, using the finite-difference time-domain （FDTD） simulation method. The metal/dielectric interface structure at this two-side aperture can support bound waves of different wavelengths, thus guiding waves in opposite directions. The covered dielectric films play an important role in the enhancement and confinement of the diffraction wave by the waveguide modes. The simulation result shows that the optical intensities of the guided surface wave at wavelengths of 760-nm and 1000-nm are about 100 times and 4-5 times those of the weaker side, respectively, which means that the surface wave is split by the proposed device.

关键词： surface plasmons finite-difference time-domain method metallic grating layered nanostructures

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Nonlinear optical properties of an azobenzene polymer

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Chinese Physics B 2014年第2期23卷 316-319页

作者：曾艺潘志华赵付丽秦苜周延王长顺 State Key Laboratory of Advanced Optical Communication Systems and Networks Department of PhysicsShanghai Jiao Tong University

The nonlinear optical properties of an azobenzene polymer azol2-MO were investigated by a Z-scan technique. The polymer was synthesized by assembling the liquid-crystalline polymer azol2 with methyl orange. The nonlinear refrac- tive index （1.39×10^-15 cm2/W） and the nonlinear absorption coefficient （0.11 cm/GW） of azol2-MO were determined with 532-nm picosecond laser pulses at the irradiance of 92.40 GW/cm2. When compared to the nonlinear properties of azol2 and methyl orange, azol2-MO possesses the advantages of its two constituents and shows larger nonlinear optical properties.

关键词： nonlinear optics reverse saturable absorption azobenzene polymer

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