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Automatic mode-locking fiber lasers: progress and perspectives

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science China(Information sciences) 2020年第6期63卷 119-142页

作者： Guoqing PU Li ZHANG Weisheng HU Lilin YI State Key Lab of advanced communication Systems and Networks Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong University

Polarization control in nonlinear polarization rotation based mode-locked fiber lasers is a longterm challenge. Suffering from the polarization drifts induced by environmental disturbances, nonlinear polarization rotation based mode-locked fiber lasers is difficult in continuously operating under the desired pulsation regime thereby substantially hindering their utilizations. The appearance of automatic modelocking techniques brings the light in addressing this challenge. Combining with various algorithms and electrical polarization control, automatic mode-locking techniques resolve the dilemma of nonlinear polarization rotation based mode-locked fiber lasers. We review the research progress of automatic mode-locking techniques in detail. Furthermore, we comment on the perspectives and potential applications of automatic mode-locking techniques.

关键词： nonlinear polarization rotation ultrashort pulses automatic mode-locking electrical polarization control optimization algorithms machine learning time stretch

An overview of ML-based applications for next generation optical networks

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science China(Information sciences) 2020年第6期63卷 31-46页

作者： Ruoxuan GAO Lei LIU Xiaomin LIU Huazhi LUN Lilin YI Weisheng HU Qunbi ZHUGE Shanghai Institute for Advanced Communication and Data Science State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronic Engineering Shanghai Jiao Tong University

Over the past few decades, the demand for the capacity and reliability of optical networks has continued to grow. In the meantime, optical networks with larger knowledge scales have become sources of numerous heterogeneous data. In order to handle these new challenges, many issues need to be resolved,among which the low-margin optical networks design, power optimization, routing and wavelength assignment(RWA), failure management are quite important. However, the use of traditional algorithms in the above four applications shows some shortcomings. Fortunately, artificial intelligence(AI), especially machine learning(ML), is regarded as one of the most promising methods to overcome these shortcomings. In this study, we review the applications of ML methods in solving these four issues. Although many ML-based researches have emerged, the applications of ML techniques in optical networks still face challenges. Therefore, we also discuss some possible future directions of investigating ML-based approaches in optical networks.

关键词： optical networks artificial intelligence machine learning system margin power optimization routing and wavelength assignment failure management

A Network-Level Connected Autonomous Driving Evaluation Platform Implementing C-V2X Technology

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China communications 2021年第6期18卷 77-88页

作者： Siyu Fu Wei Zhang Zhiyuan Jiang School of communication&Information Engineering Shanghai UniversityShanghai 200444China Shanghai Institute for Advanced Communication and Data Science(shanghai University) Shanghai 200444China

With the emerging connected autonomous driving paradigm,more advanced applications leveraging vehicular communications are drawing tremendous attentions.In order to analyze the feasibility and performance of these applications,it is necessary to build an evaluation platform that jointly considers vehicular communication,road traffic and vehicle dynamics.This article describes our recent progress on network-level autonomous driving simulator based on the Cellular-Vehicle-to-Everything(C-V2X)protocol,and a joint platform combined with SUMO and CARLA simulators for evaluating road traffic and vehicle dynamics.To demonstrate its effectiveness,this article implements a hybrid multi-intersection scheduling scheme on the platform,and shows the advantages of the scheme in terms of traffic efficiency and fault tolerance.A remote driving application based on CARLA,wherein the interplay between communication and computation is also investigated.

关键词： performance evaluation LTE-V2X SUMO CARLA multi-intersection remote driving

Side channel attack of multiplication in GF(q) –application to secure RSA-CRT

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science China(Information sciences) 2019年第3期62卷 202-204页

作者： Sen XU Weija WANG Xiangjun LU Zheng GUO Junrong LIU Dawu GU Department of Computer science and Engineering Shanghai Jiao Tong University Shanghai Institute for Advanced Communication and Data Science

Dear editor,In the field of side-channel attacks (SCAs), the security of both block ciphers and public key cryptosystems is widely studied after the seminal differential power analysis (DPA)[1]. The straightforward implementations of both types of cryptographic algorithms are vulnerable to SCAs. The former attack methods are based on a compari-

关键词： RSA Side channel attack of multiplication in GF application to secure RSA-CRT

Photonic aided vector millimeter-wave signal generation without digital-to-analog converter

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Chinese Optics Letters 2021年第1期19卷 19-23页

作者：王演祎王凯辉周雯余建军 Shanghai Institute for Advanced Communication and Data Science Key Laboratory for Information Science of Electromagnetic WavesFudan UniversityShanghai 200433China

A novel scheme of photonic aided vector millimeter-wave(mm-wave)signal generation without a digital-to-analog converter(DAC)is proposed.Based on our scheme,a 20 Gb/s 4-ary quadrature amplitude modulation(4-QAM)mm-wave signal is generated without using a DAC.The experiment results demonstrate that the bit error rate(BER)of 20 Gb/s 4-QAM mmwave signal can reach below the hard-decision forward-error-correction threshold after a delivery over 1 m wireless distance.Because the DAC is not required,it can reduce the system cost.Besides,by using photonic technology,the system is easily integrated to create large-scale production and application in high-speed optical communication.

关键词： photonic aiding millimeter-wave digital-to-analog converter

Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis

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Light(science & Applications) 2020年第1期9卷 1881-1888页

作者： Guoqing Pu Lilin Yi Li Zhang Chao Luo Zhaohui Li Weisheng Hu State Key Lab of advanced communication Systems and Networks Shanghai Institute for Advanced Communication and Data ScienceShanghai Jiao Tong UniversityShanghai 200240China Sun Yat-sen University/Southern Marine science and Engineering Guangdong Laboratory ZhuhaiChina

Mode-locked fiber lasers based on nonlinear polarization evolution can generate femtosecond pulses with different pulse widths and rich spectral distributions for versatile applications through polarization tuning.However,a precise and repeatable location of a specific pulsation regime is extremely challenging.Here,by using fast spectral analysis based on a time-stretched dispersion Fourier transform as the spectral discrimination criterion,along with an intelligent polarization search algorithm,for the first time,we achieved real-time control of the spectral width and shape of mode-locked femtosecond pulses;the spectral width can be tuned from 10 to 40 nm with a resolution of ~1.47 nm,and the spectral shape can be programmed to be hyperbolic secant or triangular.Furthermore,we reveal the complex,repeatable transition dynamics of the spectrum broadening of femtosecond pulses,including five middle phases,which provides deep insight into ultrashort pulse formation that cannot be observed with traditional mode-locked lasers.

关键词： polarization tuning spectral

Spectrally efficient single carrier 400G optical signal transmission

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Frontiers of Optoelectronics 2019年第1期12卷 15-23页

作者： Jianjun YU Shanghai Institute for Advanced Communication and Data Science Key Laboratory for Information Science of Electromagnetic Waves(MoE)Fudan UniversityShanghai 200433China

In this paper,the recent progress on spectrally efficient single carrier(SC)400G optical signal transmission was summarized.By using quadrature phase shift keying(QPSK),16 quadrature amplitude modulation(16QAM)and 64QAM,we can realize transmission distance over 10000,6000 and 3000 km,respectively,with large area fiber and all-Raman amplification.To improve the system performance and generate high-order QAM,advanced digital signal processing algorithms such as probabilistic shaping and look-up table pre-distortion are employed to improve the transmission performance.

关键词： coherent detection digital signal processing single carrier (SC) probabilistic shaping OFDM

Ultra-high range resolution demonstration of a photonics-based microwave radar using a high-repetition-rate mode-locked fiber laser

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Chinese Optics Letters 2018年第6期16卷 88-92页

作者：徐绍夫邹卫文杨光陈建平 State Key Laboratory of advanced Optical communication Systems and Networks Shanghai Institute for Advanced Communication and Data Science Department of Electronic EngineeringShanghai Jiao Tong University

We experimentally demonstrate the ultra-high range resolution of a photonics-based microwave radar using a high repetition rate actively mode-locked laser（AMLL）. The transmitted signal and sampling clock in the radar originate from the same AMLL to achieve a large instantaneous bandwidth. A Ka band linearly frequency modulated signal with a bandwidth up to 8 GHz is successfully generated and processed with the electro-optical upconversion and direct photonic sampling. The minor lobe suppression（MLS） algorithm is adopted to enhance the dynamic range at a cost of the range resolution. Two-target discrimination with the MLS algorithm proves the range resolution reaches 2.8 cm. The AMLL-based microwave-photonics radar shows promising applications in high-resolution imaging radars having the features of high-frequency band and large bandwidth.

关键词： Ultra-high range resolution demonstration of a photonics-based microwave radar using a high-repetition-rate mode-locked fiber laser

advanced modulation formats for underwater visible light communications [Invited]

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Chinese Optics Letters 2018年第12期16卷 20-30页

作者：迟楠石蒙 Key Laboratory for Information science of Electromagnetic Waves (MoE) Shanghai Institute for Advanced Communication and Data ScienceFudan University

In this paper, we present a detailed comparison of applying three advanced modulation formats including carrierless amplitude and phase modulation（CAP）, orthogonal frequency division multiplexing（OFDM）, and discrete Fourier transform spread orthogonal frequency division multiplexing（DFT-S OFDM） in underwater visible light communication（UVLC） systems. Cascaded post-equalization schemes are suggested to compensate the system impairments. For the first time, a two-level post-equalizer is presented to mitigate the nonlinear effect and improve the system performance of UVLC. The first post-equalization is based on a novel recursive least square Volterra. These modulation formats are all experimentally demonstrated with corresponding digital signal processing（DSP） algorithms. The experimental results show that single carrier modulations including CAP and DFT-S OFDM can outperform OFDM. Our experiment results show that up to 3 Gb/s over a 1.2 m underwater visible light transmission can be achieved by using DFT-S OFDM 64 QAM and CAP-64. The measured bit error rate is well under the hard decision-forward error correction（HD-FEC） threshold of 3.8 × 10;.

关键词： Invited advanced modulation formats for underwater visible light communications CAP QAM DFT