Applied Optics and Photonics China最新文献_第7页

Effective framework for space target detection through atmospheric turbulence 通过大气湍流探测空间目标的有效框架

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3005214

Yiming Chen, Jing Wang, Zhehan Song, Haoying Li, Ziran Zhang, Qi Li, Zhi-hai Xu, H. Feng, Yue-ting Chen

引用次数: 0

Design and implementation of PPM modulation and demodulation algorithm in atmospheric turbulence channel 大气湍流信道中 PPM 调制和解调算法的设计与实现

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007672

Haoyu Zhang, Yuying Mei, Yadi Chen, Zhe Xie, Bing Lei

{"title":"Design and implementation of PPM modulation and demodulation algorithm in atmospheric turbulence channel","authors":"Haoyu Zhang, Yuying Mei, Yadi Chen, Zhe Xie, Bing Lei","doi":"10.1117/12.3007672","DOIUrl":"https://doi.org/10.1117/12.3007672","url":null,"abstract":"A pulse position modulation (PPM) algorithm is designed and implemented to counter atmospheric turbulence interference in free-space optical (FSO) communication. A homemade turbulence simulation device based on thermal wind has been constructed to simulated a atmospheric turbulence channel, and it has been utilized to check the performance of the FSO communication system in atmospheric turbulence conditions. Both the signal modulation schemes of 4-ary pulse position modulation (4-PPM) and non-return-to-zero (NRZ) on-off keying (OOK) are implemented and compared in the system, and their corresponding modulation and demodulation algorithms have been realized using the field-programmable gate arrays (FPGA). To verify the effectiveness and practical performance of the PPM algorithm, extensive experiments have been carried out on the FSO communication system under laboratory- simulated atmospheric turbulence conditions, and the bit error rates (BER) of the PPM and OOK modulation schemes have been obtained and compared. The experimental results in the simulating atmospheric turbulence channel show that the PPM modulation system designed in this study yields a lower BER than the OOK modulation system under different turbulence intensities. Furthermore, as the turbulence intensity increases, the BER’s improvement of the PPM modulation system becomes more remarkable. The research results indicate the FSO communication system with PPM modulation possesses superior performance in an atmospheric turbulence channel.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"13 10","pages":"129590V - 129590V-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Infrared optical design with large FOV based on image space scanning 基于图像空间扫描的大视场红外光学设计

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3005469

Ming Li

引用次数: 0

IPMSM sensorless control technology based on high frequency square wave injection method 基于高频方波注入法的 IPMSM 无传感器控制技术

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3000610

Zhiliang Yu, Yu Zhang, Yu Feng, Yuan Wang, Chengmiao Xu

引用次数: 0

Fast and lightweight network improves serial brain section stitching 快速轻便的网络改进了串行脑切片缝合技术

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3005396

Lianchao Wang, Jiajia Chen, W. Gong, Ke Si

{"title":"Fast and lightweight network improves serial brain section stitching","authors":"Lianchao Wang, Jiajia Chen, W. Gong, Ke Si","doi":"10.1117/12.3005396","DOIUrl":"https://doi.org/10.1117/12.3005396","url":null,"abstract":"High-resolution three-dimensional brain image reconstruction is crucial for understanding the brain. Light sheet microscopy combined with tissue clearing imaging plays a pivotal role in analyzing the micro-level structure of mammalian brains. However, the complex multi-level stitching process poses challenges such as non-overlapping areas, surface deformation, and tissue loss, resulting in incomplete or discontinuous tissue structures at the junctions. These issues not only impact the precision of the atlas but also complicate subsequent analyses like cell counting and neuron tracing. To address these issues, we propose a rapid deep learning-based image inpainting approach for accurate neuron reconstruction and analysis. Our approach involves initially employing conventional registration algorithms to preliminarily stitch brain sections together, followed by utilizing a neural network to predict and restore missing tissue with a thickness exceeding 10 µm. This process enhances the structural continuity and integrity between adjacent brain slices. Compared to the original 3D U-Net and ResNet models, our approach performs better and has a processing speed that is five times faster than the original 3D U-Net. Moreover, our method enables more accurate cell counting by repairing incomplete cell bodies, leading to an average improvement of 37.37% in the number of cell bodies accurately counted near the slice junction. By integrating this novel 3D image inpainting network into brain reconstruction processes, our research opens new avenues for a more detailed and accurate investigation of neural circuitry and neurological disorders.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"19 6","pages":"129631V - 129631V-9"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sliding mode control of photoelectric stabilized platform based on nonlinear tracking differentiator 基于非线性跟踪微分器的光电稳定平台滑模控制

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3000057

Ting Ji, Yu Liu, Yawei Wang, Zhidong Liu, Lijun Zhou, Fei Liu, Song Li, Yixuan Kang, Qinglin Zhao, Kai Shi, Yuxin Gao, Xuetao Jia, Heng Lu

引用次数: 0

Performance analysis of dual-frequency coherent lidar for rough target detection in turbulent atmosphere 用于湍流大气中粗略目标探测的双频相干激光雷达性能分析

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007941

Xiao Dong, Huizhen Bai, Shilong Xu

{"title":"Performance analysis of dual-frequency coherent lidar for rough target detection in turbulent atmosphere","authors":"Xiao Dong, Huizhen Bai, Shilong Xu","doi":"10.1117/12.3007941","DOIUrl":"https://doi.org/10.1117/12.3007941","url":null,"abstract":"The dual-frequency coherent lidar (DFCL) has advantages of anti-interference, stability, and can obtain low Doppler frequency shift in high-speed dynamic target detection. A performance evaluation model of DFCL is established for remote Gaussian rough object detection. The detection ability is closely related to laser echo characteristics, especially the intensity and coherence. The laser beam radius on the far field increases with the decay of the emitted laser pulse coherence, and the atmospheric turbulence reduces the coherence further. The intensity utilization factor is defined and calculated. The decoherence effects of rough surfaces are calculated via the complex coherence degree under typical roughness parameters and laser wavelength. Moreover, the Doppler frequency shift is proportional to dual-frequency difference ∆f, but the signal-to-noise ratio (SNR) decreases with larger ∆f duo to the coherence reduction of dual-frequency laser, and the optimal dual-frequency difference ∆fm selection criteria is determined for practical applications; and the system efficiency reduction factor are calculated and compared under typical detection parameters. Finally, the combined effects of laser source coherence, atmospheric turbulence, optical parameters and ∆f on the SNR improvements are analyzed considering dual-frequency and single frequency lidar systems. This research is of significance to reveal the dual-frequency coherent detection process and the optimization method of coherent lidar systems.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"47 2","pages":"1295914 - 1295914-9"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Busyness level-based deep reinforcement learning method for routing, modulation, and spectrum assignment of elastic optical networks 基于繁忙程度的深度强化学习方法，用于弹性光网络的路由、调制和频谱分配

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007879

Chengsheng Liang, Yuqi Tu, Yue-Cai Huang

引用次数: 0

Multi-wavelength laser array based on REC integrated with silicon-based devices by photonic wire bonding 基于 REC 的多波长激光阵列，通过光子线键合与硅基器件集成

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007834

Yipeng Mei, Yuxin Ma, Jun Lu, Tongtong Yang, Yue-chun Shi, Lianyan Li, Xin Wang, Ming Li, Rulei Xiao, Xiangfei Chen

{"title":"Multi-wavelength laser array based on REC integrated with silicon-based devices by photonic wire bonding","authors":"Yipeng Mei, Yuxin Ma, Jun Lu, Tongtong Yang, Yue-chun Shi, Lianyan Li, Xin Wang, Ming Li, Rulei Xiao, Xiangfei Chen","doi":"10.1117/12.3007834","DOIUrl":"https://doi.org/10.1117/12.3007834","url":null,"abstract":"A 16-channel optical transmitter chip with a digital transmission capacity up to 1.6 Tb/s has been demonstrated. In this chip, a 16-wavelength III–V DFB laser array (MLA), a silicon Mach-Zehnder interferometer (MZI) modulator array and a 16-channel fiber array are hybrid integrated by photonic wire bonding (PWB) technique. The MLA based on reconstruction-equivalent-chirp (REC) technique proves a good wavelength spacing uniformity of all wavelengths. Each unit laser with 1.2 mm cavity length in the MLA exhibits good single-longitudinal-mode operation with the output power over 18 dBm at an injection current of 300 mA. Spectral measurements show the channels coincide well with the designed 200 GHz spacing, with wavelength deviations within a range of ±0.2 nm. Based on PWB technique, three chips mentioned above are integrated optically on one Wu-Cu substrate as a 16-channel optical transmitter. The largest output power of optical transmitter is 1.5 mW and all channels still keep good single mode outputs after PWB integration. The tested modulation speed of each channel is up to 100 Gb/s, which implies the total transmission capacity of this device is 1.6 Tb/s.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"133 ","pages":"129661Y - 129661Y-5"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on infrared hyperspectral band selection algorithm based on autoencoder 基于自动编码器的红外高光谱波段选择算法研究

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007251

Chang Liu, Guangping Wang

引用次数: 0