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主办单位：
中国光学工程学会清华大学上海理工大学
名誉主编： 庄松林院士
国际主编： 顾敏院士
主编：
孙洪波教授仇旻教授
创刊：2020年3月
ISSN：2662-1991

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最新上线

Harnessing nonlinear optoelectronic oscillator for speeding up reinforcement learning

Ziwei Xu, Huan Tian, Zhen Zeng, Lingjie Zhang, Yaowen Zhang, Heping Li, Zhiyao Zhang, Yong Liu

doi: 10.1186/s43074-025-00163-w

Abstract(0) PDF(0)

Abstract:
Reinforcement learning is an indispensable branch of artificial intelligence (AI), referring to the technology and methods of maximizing the rewards from an uncertain environment. As Moore’s law is coming to an end, the operation speed and the energy consumption of the advanced integrated circuits are gradually unable to meet the ever-increasing requirements of reinforcement learning. In recent years, photonic accelerator evolves as a powerful candidate to solve this issue. Here, a brand-new photonic accelerator based on a nonlinear optoelectronic oscillator (NOEO) is proposed and demonstrated to solve the multi-armed bandit (MAB) problem and simulate the Tic Tac Toe (TTT) game, both of which are the most famous reinforcement learning problems. Through adjusting the balance between the gain and the nonlinearity in the NOEO cavity, four parallel orthogonal chaotic sequences are generated with a 6-dB bandwidth up to 18.18 GHz and a permutation entropy (PE) as high as 0.9983. With assistance of tug-of-war and time differential methods, a 512-armed bandit problem and an intelligent TTT game are successfully accelerated, respectively. This work presents an innovative photonic accelerator for solving reinforcement learning problems more efficiently. Apart from reinforcement learning, the proposed scheme can find applications in other fields of AI, such as reservoir computing and neural networks. Reinforcement learning is an indispensable branch of artificial intelligence (AI), referring to the technology and methods of maximizing the rewards from an uncertain environment. As Moore’s law is coming to an end, the operation speed and the energy consumption of the advanced integrated circuits are gradually unable to meet the ever-increasing requirements of reinforcement learning. In recent years, photonic accelerator evolves as a powerful candidate to solve this issue. Here, a brand-new photonic accelerator based on a nonlinear optoelectronic oscillator (NOEO) is proposed and demonstrated to solve the multi-armed bandit (MAB) problem and simulate the Tic Tac Toe (TTT) game, both of which are the most famous reinforcement learning problems. Through adjusting the balance between the gain and the nonlinearity in the NOEO cavity, four parallel orthogonal chaotic sequences are generated with a 6-dB bandwidth up to 18.18 GHz and a permutation entropy (PE) as high as 0.9983. With assistance of tug-of-war and time differential methods, a 512-armed bandit problem and an intelligent TTT game are successfully accelerated, respectively. This work presents an innovative photonic accelerator for solving reinforcement learning problems more efficiently. Apart from reinforcement learning, the proposed scheme can find applications in other fields of AI, such as reservoir computing and neural networks.

Wide-viewing-angle color holographic 3D display system with high brightness encoding

Yi-Wei Zheng, Fan Chu, Fan-Chuan Lin, Yi-Xiao Hu, Yi-Long Li, Yi Zheng, Di Wang, Qiong-Hua Wang

doi: 10.1186/s43074-025-00162-x

Abstract(10) PDF(0)

Abstract:
Holographic 3D display technology, widely considered the ultimate solution for real 3D display, has broad applications in fields including advertisement, industrial manufacturing and military. However, it is difficult to simultaneously realize color holographic 3D display with wide viewing angle and high brightness required for an immersive visual experience. Here, a novel holographic 3D display system based on a customized achromatic liquid crystal grating and a phase-only spatial light modulator is proposed. Thanks to the secondary diffraction performed by the achromatic liquid crystal grating, nine secondary diffraction images of red, green and blue channels overlap in space in time sequence. Additionally, a high brightness hologram encoding method is developed, which introduces a frequency loss function with dynamic weights to ensure that differences of all frequency components in the frequency domain can be learned. The proposed method dramatically enhances light energy utilization by a factor of five, resulting in significantly brighter reconstructed images while substantially attenuating background noise in non-target regions. This groundbreaking system, achieving a remarkable ~ 65° wide viewing angle with good image quality and high brightness, represents a significant advancement in holographic technology, offering a comprehensive solution for wide-viewing-angle, high-brightness, color 3D displays with potential applications across diverse technological domains.

Orthogonal GHz harmonic dual-comb generation in monolithic fiber cavity for acquisition speed multiplication

Guorui Wang, Zixuan Ding, Fei Xu

doi: 10.1186/s43074-025-00161-y

Abstract(9) PDF(0)

Abstract:
Asynchronous dual-comb generated in single laser cavity offer potent tools for simplified coherent measurements, owing to the common mode rejection which spares the sophisticated locking systems. However, the limited dimensional inhomogeneity in monolithic cavity induces relatively small repetition-rate-difference, hindering high-speed measurements. Here, a monolithic linear fiber laser with integrated multifunctional device employing polarization multiplexing is proposed and demonstrated for dual-comb acquisition speed enhancement. By tuning the inherent polarization-dependent degrees of freedom within the device, optical intensity distribution between orthogonal polarizations can be finely manipulated, thus boosting controllable asynchronous harmonic mode-locking. The two sets of harmonic mode-locked pulses enable the multiplication of the equivalent repetition-rate-difference and produce more temporal interferograms via least common multiple principles. With a fundamental-repetition-rate of 383 MHz, harmonic-repetition-rate up to 2.3 GHz and acquisition speed over 244 kHz are obtained in experiments, faster by 2 orders of magnitudes than previous single-fiber-cavity dual-combs. Equivalent repetition-rate-difference up to 400 kHz is also achieved with shorter laser cavity. This orthogonally polarized GHz harmonic dual-comb laser offers insights for a novel dual-comb generation paradigm and provides a single-fiber-integrated solution for acquisition boosting in wide measurement applications.

High-security nondeterministic encryption communication based on spin-space-frequency multiplexing metasurface

Shi Sun, Yue Gou, Tie Jun Cui, Hui Feng Ma

doi: 10.1186/s43074-024-00154-3

Abstract(22) PDF(3)

Abstract:
Information security plays an important role in every aspect of life to protect data from stealing and deciphering. However, most of the previously reported works were based on pure algorithm layer or pure physical layer encryptions, which have certain limitations in security. In this paper, a nondeterministic message encryption communication scheme is proposed based on a spin-space-frequency multiplexing metasurface (SSFMM), which integrates both algorithmic and physical layer encryptions, and can also produce multiple different ciphertexts for the same message to prevent the message from being cracked through frequency analysis, thus greatly enhancing the security of the information. To be specific, an SSFMM is first designed as a physical-layer meta-key, which can generate eight independent dot matrix holograms with different spin, space, and frequency characteristics. The target message is then encrypted based on these dot matrix holograms combined with algorithmic operations, and the encrypted message is converted into a quick response (QR) code for easy sending to the target users. Once the target user gets that QR code, he/she can scan it to obtain the encryption information, and then recover the target message according to the pre-agreed encryption protocol combined with the eight dot matrix holograms of SSFMM. Finally, the feasibility of the proposed encryption scheme was experimentally validated at the microwave frequency band.

引用排行

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Yan Peng, Chenjun Shi, Yiming Zhu, Min Gu, Songlin Zhuang

2020, 1(1). doi: 10.1186/s43074-020-00011-z

PDF(36)

Recent advances in multi-dimensional metasurfaces holographic technologies

Ruizhe Zhao, Lingling Huang, Yongtian Wang

2020, 1(1). doi: 10.1186/s43074-020-00020-y

PDF(58)

Information Metamaterials: bridging the physical world and digital world

Qian Ma, Tie Jun Cui

2020, 1(1). doi: 10.1186/s43074-020-00006-w

PDF(61)

Vacuum-ultraviolet photodetectors

Lemin Jia, Wei Zheng, Feng Huang

2020, 1(1). doi: 10.1186/s43074-020-00022-w

PDF(35)

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