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27th International Conference on optical Fiber Sensors, OFS 2022

作者： Zhu, Yidai Fan, Xinyu Zhang, Zhaopeng Yuan, Zhengchao Xu, Bingxin He, Zuyuan State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China Peng Cheng Laboratory Guangdong Shenzhen518055 China

We propose an OFDR system with the assistance of dual electro-optic frequency comb (EOFC). Rayleigh backscattering signals collected by multiple comb lines are synthesized to broaden the frequency sweep range for the ... 详细信息

ISBN: (纸本)9781957171142

关键词： Effective refractive index Frequency combs optical amplification optical amplifiers Spatial resolution Swept sources

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Two-Stage Topic Sentence Extraction for Chinese Student Essays 12th

Two-Stage Topic Sentence Extraction for Chinese Student Ess...

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12th National CCF Conference on Natural Language Processing and Chinese Computing, NLPCC 2023

作者： Dong, Yuwu Zheng, Feiran Chen, Hongyu Ding, Yizhou Zhou, Yifan He, Hao MoE Key Lab of Artificial Intelligence AI Institute Shanghai Jiao Tong University Shanghai China State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9783031446986

In this paper, we present the method proposed by our team for Track 2 of NLPCC 2023 Shared Task 7, which focuses on the extraction of paragraph-level and whole essay topic sentences in middle school student essays. This paper proposes a two-stage topic sentence extraction framework for each paragraph and the whole essay. In the first stage, we extract topic sentences for each paragraph, considering local semantic and contextual aspects. In the second stage, we derive the text topic sentence for the whole essay from the extracted paragraph-level topic sentences. Compared with the one-stage method, the two-stage method which can focus on the local semantic information of paragraphs related to the task has advantages in paragraph and full-text topic sentence extraction. Comparative experiments show that the extraction performance of the fine-tuned two-stage topic sentence extraction framework surpasses the few-shot large language models (GPT-3.5 et al.). The final comprehensive index also achieved the first-place result in this track. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Semantics

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Rate compatible reconciliation for continuous-variable quantum key distribution using Raptor-like LDPC codes

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Science China(Physics,Mechanics & Astronomy) 2021年第6期64卷 26-34页

作者： Chao Zhou Xiang Yu Wang ZhiGuo Zhang Song Yu ZiYang Chen Hong Guo State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronicsand Center for Quantum Information TechnologyPeking UniversityBeijing 100871China

In the practical continuous-variable quantum key distribution(CV-QKD)system,the postprocessing process,particularly the error correction part,significantly impacts the system ***-edge type low-density parity-check(MET-LDPC)codes are suitable for CV-QKD systems because of their Shannon-limit-approaching performance at a low signal-to-noise ratio(SNR).However,the process of designing a low-rate MET-LDPC code with good performance is extremely ***,we introduce Raptor-like LDPC(RL-LDPC)codes into the CV-QKD system,exhibiting both the rate compatible property of the Raptor code and capacity-approaching performance of MET-LDPC ***,this technique can significantly reduce the cost of constructing a new *** design the RL-LDPC matrix with a code rate of 0.02 and easily and effectively adjust this rate from 0.016 to *** results show that we can achieve more than 98%reconciliation efficiency in a range of code rate variation using only one RL-LDPC code that can support high-speed decoding with an SNR less than-16.45 d *** code allows the system to maintain a high key extraction rate under various SNRs,paving the way for practical applications of CV-QKD systems with different transmission distances.

关键词： continuous-variable quantum key distribution reconciliation Raptor-like LDPC codes

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Pilot symbol-free iterative optical field reconstruction for power fading mitigation in short-reach IM-DD links 26

Pilot symbol-free iterative optical field reconstruction for...

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26th Optoelectronics and communications Conference, OECC 2021

作者： Zhu, Yixiao Zhang, Lei Fang, Xiansong Zhang, Fan Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing100871 China

We demonstrate pilot symbol-free iterative optical field reconstruction based on modified Gerchberg-Saxton (GS) algorithm for power fading mitigation in IM-DD links. 45Gbaud PAM-4 is experimentally transmitted over 20... 详细信息

ISBN: (纸本)9781557528209

关键词： Iterative methods

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Delta-Sigma Modulation with Coherent Detection for High-Fidelity 4194304-QAM Transmission at 71.5dB SNR

Delta-Sigma Modulation with Coherent Detection for High-Fide...

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2021 Asia communications and Photonics Conference, ACP 2021

作者： Zhu, Yixiao Fang, Xiansong Yin, Longjie Zhang, Lei Zhang, Fan Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing100871 China

We experimentally demonstrate 1/2-bit delta-sigma modulation and transmission in a 40Gbaud QPSK/16-QAM coherent system. After 24km SSMF transmission, up to 2.5Gbaud 4194304-QAM Nyquist signal is successfully transmitt... 详细信息

ISBN: (纸本)9781957171005

关键词： Quadrature amplitude modulation

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Impact Analysis of Multi-Path Interference on Real-Time 5G Front-Haul Transmission system with 50Gbit/s IM-DD Transceivers

Impact Analysis of Multi-Path Interference on Real-Time 5G F...

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2023 Asia communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Sheng, Xia Liu, Hao Wu, Yangbo Zhuge, Qunbi Zhang, Anxu Lv, Kai Feng, Lipeng Liu, Yuyang Huo, Xiaoli Li, Junjie Feng, Jia Tan, Bowen China Telecom Research Institute State Key Laboratory of Optical Fiber and Cable Manufacture Technology Beijing China Huawei Technologies Co. Ltd Shanghai China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai China

We establish a realtime 5G front-haul system with 50Gbit/s transceivers to illustrate the impact of multi-path interference. The experimental results demonstrate that the performance significantly degrades when the MP... 详细信息

ISBN: (纸本)9798350312614

关键词： front-haul transmission system multi-path interference

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Electro-optical phase-locked loop for hybrid integrated external cavity laser

Electro-optical phase-locked loop for hybrid integrated exte...

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2023 optical Fiber communications Conference and Exhibition, OFC 2023

作者： Liu, Chuxin Guo, Yuyao Xu, Ruiyang Lu, Liangjun Chen, Jianping Zhou, Linjie Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Lab of Navigation and Location Services Shanghai Institute for Advanced Communication and Data Science Department of Electronic Engineering Shanghai200240 China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu314200 China

We implement an analog EO-PLL for a III/V-Si3N4 hybrid integrated ECL to generate a highly-linear FMCW signal over multiple wavelengths. The ranging resolution is improved from 5 m to 35 cm for a 100-m target. © ... 详细信息

ISBN: (纸本)9781957171180

关键词： Phase locked loops

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Versatile photonic molecule switch in multimode microresonators

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Light(Science & Applications) 2024年第3期13卷 498-509页

作者： Zihan Tao Bitao Shen Wencan Li Luwen Xing Haoyu Wang Yichen Wu Yuansheng Tao Yan Zhou Yandong He Chao Peng Haowen Shu Xingjun Wang State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China College of Engineering Peking UniversityBeijing 100871China School of Integrated Circuits Peking University100871 BejingChina Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China Peng Cheng Laboratory Shenzhen 518055China

Harnessing optical supermode interaction to construct artificial photonic molecules has uncovered a series of fundamental optical phenomena analogous to atomic ***,the distinct energy levels and interactions in such two-level systems were provided by coupled *** reconfigurability is limited,as they often require delicate external field stimuli or mechanically altering the geometric *** highly specific approaches also limit potential ***,we propose a versatile on-chip photonic molecule in a multimode microring,utilizing a flexible regulation methodology to dynamically control the existence and interaction strength of spatial *** transition between single/multi-mode states enables the“switched-off/on”functionality of the photonic molecule,supporting wider generalized applications *** particular,“switched-on”state shows flexible and multidimensional mode splitting control in aspects of both coupling strength and phase difference,equivalent to the *** *** effect.“Switched-off”state allows for perfect low-loss single-mode transition(Qi~10 million)under an ultra-compact bend size(FSR~115 GHz)in a foundry-based silicon *** breaks the stereotyped image of the FSR-Q factor trade-off,enabling ultra-wideband and high-resolution millimeter-wave photonic *** demonstration provides a flexible and portable solution for the integrated photonic molecule system,extending its research scope from fundamental physics to real-world applications such as nonlinear optical signal processing and sixth-generation wireless communication.

关键词： switched multimode millimeter

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Deep learning-based approach for efficient ge neration and transmission of high-definition computer-generated holography 14

Deep learning-based approach for efficient ge neration and t...

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Advances in Display Technologies XIV 2024

作者： Jia, Jidong Dong, Zhenxing Ling, Yuye Li, Yan Su, Yikai Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

ISBN: (纸本)9781510670761

Deep learning-based computer-generated holography (CGH) has recently demonstrated tremendous potential in three-dimensional (3D) displays and yielded impressive display quality. However, current CGH techniques are mostly limited on generating and transmitting holograms with a resolution of 1080p, which is far from the ultra-high resolution (16K+) required for practical virtual reality (VR) and augmented reality (AR) applications to support a wide field o f v iew a nd l arge e ye b ox. O ne o f t he m ajor o bstacles i n c urrent C GH f rameworks lies in the limited memory available on consumer-grade GPUs which could not facilitate the generation of high-definition h olograms. M oreover, t he e xisting h ologram c ompression r ate c an h ardly p ermit t he transmission of high-resolution holograms over a 5G communication network, which is crucial for mobile application. To overcome the aforementioned challenges, we proposed an efficient jo int fr amework fo r ho logram ge neration and transmission to drive the development of consumer-grade high-definition h olographic d isplays. S pecifically, for hologram generation, we proposed a plug-and-play module that includes a pixel shuffle la yer an d a lightweight holographic super-resolution network, enabling the current CGH networks to generate high-definition holograms. For hologram transmission, we presented an efficient ho lographic tr ansmission fr amework ba sed on foveated rendering. In simulations, we have successfully achieved the generation and transmission of holograms with a 4K resolution for the first t ime o n a n N VIDIA G eForce RTX 3 090 G PU. We b elieve t he p roposed framework could be a viable approach for the evergrowing data issue in holographic displays. © 2024 SPIE.

关键词： Computer generated holography

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Full-Band optical Signal Amplification Using Bismuth-Doped Multicomponent Fibers: Models and Performance 15

Full-Band Optical Signal Amplification Using Bismuth-Doped M...

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15th International Conference on Information Optics and Photonics, CIOP 2024

作者： Zhao, Xiaoan Jiang, Chun Valley Christian High School 100 Skyway Dr #130 San JoseCA95111 United States State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

ISBN: (数字)9781510686175

ISBN: (纸本)9781510686168

Current wavelength division multiplexing (WDM) transmission systems based on silica fibers rely on the single-channel transmission rate and the number of wavelength channels for communication capacity. While single-channel rates have reached Tb/s levels, further enhancement is severely limited by electronic bottlenecks. To boost system capacity, an effective approach is to increase the number of wavelength channels. The low-loss window of silica fibers, spanning 1250-1800 nm with a loss below 0.4 dB, represents a substantial untapped resource. To fully utilize the full-band bandwidth of silica fibers, it is imperative to develop a full-band fiber amplifier covering this wavelength range. This paper proposes bismuth-doped multicomponent fiber concatenation and parallel connection schemes, establishes energy level structures, rate equations, and power propagation equations for pump, signal, and amplified spontaneous emission light in bismuth-doped silica and germano-silica matrices, calculates the full-band gain spectrum, and optimizes its flatness using a genetic algorithm. Results show that the gain magnitude and flatness of the two amplifier structures depend on pump wavelength, pump power, fiber length, and doping concentration, with the parallel structure offering greater flexibility in controlling the full-band gain spectrum. © 2024 SPIE.

关键词： Glass fibers

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