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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Tonghui Ji Qi Wu Zhaopeng Xu Honglin Ji Yu Yang Lulu Liu Shangcheng Wang Zhongliang Sun Junpeng Liang Linsheng Fan Jianwei Tang Jinlong Wei Juhao Li Weisheng Hu Pengcheng Laboratory Shenzhen China State Key Lab of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Optical Communication Systems & Networks Peking University Beijing China

We propose a fast and accurate estimation method of MDL-induced SNR penalty with non-uniform noise loading in SDM link. The proposed approach substantially saves the time cost while maintaining an estimation error wit... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： optical losses Costs Accuracy Simulation Loading Propagation losses optical fiber communication Numerical models Signal to noise ratio Photonics

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Multi-Task Learning: Towards Low-Complexity Neural network Nonlinearity Compensation in Coherent optical systems

Multi-Task Learning: Towards Low-Complexity Neural Network N...

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Asia communications and Photonics Conference and Exhibition (ACP)

We propose multi-task learning based NN equalization for nonlinearity compensation in coherent optical system. Compared with conventional NN equalization, 30% complexity reduction is achieved in an 800-Gb/s PDM-16QAM ... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Q-factor Equalizers Symbols Artificial neural networks optical computing optical fiber networks Multitasking Real-time systems Complexity theory Photonics

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A flat-top Seed Source Using Binarized Multi-frequency signals Modulation for High-Power Fiber Lasers 27

A flat-top Seed Source Using Binarized Multi-frequency signa...

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27th OptoElectronics and communications Conference/International Conference on Photonics in Switching and Computing, OECC/PSC 2022

作者： Li, Jie Shi, Mengyue Wu, Yong Wu, Zhangli Hu, Weisheng Yi, Lilin School of Electronic Information and Electrical Engineering State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

We propose a flexibly tunable seed source broadening scheme by binarized multi-frequency signal design and high-order phase modulation. Flat-top spectra with different bandwidths up to 20GHz and a 1.5-fold improvement... 详细信息

ISBN: (数字)9784885523366

ISBN: (纸本)9784885523366

关键词： Phase modulation

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Vision Tranformer-based high fidelity computer-generated holography 13

Vision Tranformer-based high fidelity computer-generated hol...

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Advances in Display Technologies XIII 2023

作者： Dong, Zhenxing Xu, Chao Tang, Yaoqi 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)9781510659919

Current learning-based computer-generated holography (CGH) algorithms often utilize convolutional neural networks (CNN)-based architectures. However, the CNN-based non-iterative methods mostly underperform the state-of-the-art (SOTA) iterative algorithms such as stochastic gradient descent (SGD) in terms of display quality. Inspired by the global attention mechanism of Vision Transformer (ViT), we propose a novel unsupervised autoencoder-based ViT for generating phase-only holograms. Specifically, for the encoding part, we use Uformer to generate the holograms. For the decoding part, we use the angular spectrum method (ASM) instead of a learnable network to reconstruct the target images. To validate the effectiveness of the proposed method, numerical simulations and optical reconstructions are performed to compare our proposal against both iterative algorithms and CNN-based techniques. In the numerical simulations, the PSNR and SSIM of the proposed method are 26.78 dB and 0.832, which are 4.02 dB and 0.09 higher than that of the CNN-based method, respectively. Moreover, the proposed method contains less speckles and features a higher display quality than other CGH methods in experiments. We suggest the improvement might be ascribed to the ViT’s global attention mechanism, which is more suitable for learning the cross-domain mapping from image (spatial) domain to hologram (Fourier) domain. We believe the proposed ViT-based CGH algorithm could be a promising candidate for future real-time high-fidelity holographic displays. © 2023 SPIE.

关键词： Holograms

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Low loss polymeric spot-size converter with two-step index transition cladding for fiber-to-chip connection 27

Low loss polymeric spot-size converter with two-step index t...

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27th OptoElectronics and communications Conference/International Conference on Photonics in Switching and Computing, OECC/PSC 2022

作者： Ma, Qiang Ma, Lin Zhuang, Yudi Li, Heyuan He, Zuyuan Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai200240 China Zhejiang Lab Hangzhou311121 China

We propose a low loss polymeric spot-size converter with two-step index transition cladding for fiber-to-chip connection. The device can simultaneously achieve a coupling loss of 1.84 dB and strictly single-mode opera... 详细信息

ISBN: (数字)9784885523366

ISBN: (纸本)9784885523366

关键词： Optoelectronic devices

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Mixed-Precision Integer-Arithmetic-Only Neural network-Based Equalizers for DML-Based Short-Reach IM/DD systems 49

Mixed-Precision Integer-Arithmetic-Only Neural Network-Based...

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49th European Conference on optical communications, ECOC 2023

作者： Xu, Zhaopeng Ji, Honglin Yang, Yu Qiao, Gang Wu, Qi Li, Jia Lu, Weiqi Liu, Lulu Wang, Shangcheng Wei, Jinlong He, Zhixue Hu, Weisheng Shieh, William Peng Cheng Laboratory Shenzhen518055 China State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China School of Engineering Westlake University Hangzhou310024 China

ISBN: (纸本)9781839539954

We propose mixed-precision integer-Arithmetic-only NNs for low-complexity equalization in a 50-Gb/s 25-km DML-based PAM4 IM/DD link based on input neuron partitioning. The proposed scheme avoids floating-point weight operations and saves 26.3% memory at a minimum NN size compared with fixed-precision quantization counterpart without degrading BER. © The Institution of Engineering & Technology 2023.

关键词： Mixed-integer linear programming

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Nonlinear-penalty-free Real-time 40×800Gb/s DP-64QAM-PCS Transmission with Launch Power of 28 dBm over a Conjoined-tube Hollow-core Fiber

Nonlinear-penalty-free Real-time 40×800Gb/s DP-64QAM-PCS Tr...

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2023 optical Fiber communications Conference and Exhibition, OFC 2023

作者： Ge, Dawei Gao, Shoufei Zuo, Mingqing Gao, Yuyang Wang, Yinging Zhang, Dechao Ding, Wei Li, Han Duan, Xiaodong Chen, Zhangyuan China Mobile Research Institute Department of Fundamental Network Technology Beijing100053 China Jinan University Institute of Photonics Technology Guangzhou510632 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing100871 China

Real-time 40×800Gb/s DP-64QAM-PCS transmissions over three different optical fibers (i.e., CTF, G.652.D, G.654.E) are tested under 28-dBm launch power for the first time. No nonlinear penalty is observed in the C... 详细信息

ISBN: (纸本)9781957171180

关键词： optical fibers

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Hypothesis Testing Prompting Improves Deductive Reasoning in Large Language Models

arXiv

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arXiv 2024年

作者： Li, Yitian Tian, Jidong He, Hao Jin, Yaohui MoE Key Lab of Artificial Intelligence AI Institute Shanghai Jiao Tong University China State Key Lab of Advanced Optical Communication System and Network China

Combining different forms of prompts with pre-trained large language models has yielded remarkable results on reasoning tasks (e.g. Chain-of-Thought prompting). However, along with testing on more complex reasoning, these methods also expose problems such as invalid reasoning and fictional reasoning paths. In this paper, we develop Hypothesis Testing Prompting, which adds conclusion assumptions, backward reasoning, and fact verification during intermediate reasoning steps. Hypothesis Testing prompting involves multiple assumptions and reverses validation of conclusions leading to its unique correct answer. Experiments on two challenging deductive reasoning datasets ProofWriter and RuleTaker show that hypothesis testing prompting not only significantly improves the effect, but also generates a more reasonable and standardized reasoning process. © 2024, CC BY-NC-ND.

关键词： Computational linguistics

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High Efficiency Fiber-Chip Edge Coupler for Near-Ultraviolet (NUV) Waveband

High Efficiency Fiber-Chip Edge Coupler for Near-Ultraviolet...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Yuhan Du Xingchen Ji Weiqiang Xie Meng Tian Yu He Yikai Su Department of Electronic Engineering State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We design and experimentally demonstrate an efficient fiber-chip edge coupler for NUV using symmetric double-tip taper and MMI-based coupler. We measure the coupling loss down to 2.85 dB at 407 nm on an alumina-on-ins... 详细信息

ISBN: (纸本)9798350369311

关键词： optical fiber polarization Couplings Microscopy optical fiber couplers Couplers Receivers optical fiber communication Loss measurement optical fiber devices System-on-chip

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Net 8×250 Gbit/s/λ PAM6/8 optical Interconnect Over High-Density Eight-Core Fiber and Low-Crosstalk Laser Direct Writing FI/FO Devices

Net 8×250 Gbit/s/λ PAM6/8 Optical Interconnect Over High-D...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Yu Yang Zhaopeng Xu Honglin Ji Gang Qiao Lulu Liu Shangcheng Wang Ruiting Cheng Jinyi Yu Chuanchuan Yang Zhixue He Yongqi He Zhangyuan Chen Weisheng Hu Juhao Li Peng Cheng Laboratory Shenzhen China State Key Lab of Advanced Optical Communication Systems and Networks Peking University Beijing China State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We experimentally demonstrate a net 8×250 Gbit/s/λ PAM6 and PAM8 transmission over 200-m standard-125μm-cladding high-density eight-core fiber and low-crosstalk femtosecond laser direct writing fan-in/fan-out devices. The proposed prototype system is promising for high-speed optical interconnection applications.

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