Journal of The Optical Society of America A-optics Image Science and Vision最新文献_第6页

Experimental performance analysis of a realistic FSO link in weak turbulent channels for 5G backhaul connectivity. 5G回程连接弱湍流信道中实际FSO链路的实验性能分析。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.597489

Saad Saeed, Abdullah Nafis Khan, Usman Younis

{"title":"Experimental performance analysis of a realistic FSO link in weak turbulent channels for 5G backhaul connectivity.","authors":"Saad Saeed, Abdullah Nafis Khan, Usman Younis","doi":"10.1364/JOSAA.597489","DOIUrl":"https://doi.org/10.1364/JOSAA.597489","url":null,"abstract":"Free-space optical (FSO) communication links have emerged as a promising solution for future networks such as 5G, 6G, and beyond by enabling low-cost, power-efficient, and high-speed backhaul connectivity. However, atmospheric turbulence can degrade link performance by reducing the optical signal-to-noise ratio (OSNR), increasing the bit error rate (BER) and limiting the achievable data rate. In this work, we employ a weak-turbulence channel model based on measured temperature and pressure to estimate the refractive index structure parameter (Cn2) and scintillation index (σI2). These parameters are used to quantify turbulence strength and analyze its impact on optical beam propagation. The modeled OSNR and BER are analyzed for varying turbulence strengths. The measured OSNR of approximately 30 dB from the 50 m indoor channel corresponds to an achievable data rate of about 350 Mbps, yielding a BER of 10-8, which is below the FEC threshold. The calculated OSNR is further validated using values derived from the measured received signal and noise optical powers. Finally, the (Cn2) value obtained from the indoor measurements is used to estimate the outdoor transmission range that provides comparable performance. The analysis predicts an effective outdoor link range of approximately 800 m, demonstrating the potential of this approach for designing FSO backhaul links in beyond-5G/6G microcell networks.","PeriodicalId":17382,"journal":{"name":"Journal of The Optical Society of America A-optics Image Science and Vision","volume":"43 8","pages":"1293-1301"},"PeriodicalIF":1.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149167209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Channel correlation-aware DQN-based adaptive power transmission in an FSO network. FSO网络中基于信道相关感知dqn的自适应功率传输。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.595594

Wen-Xuan Gao, Yan-Qing Hong, Jian-Hua Yin

{"title":"Channel correlation-aware DQN-based adaptive power transmission in an FSO network.","authors":"Wen-Xuan Gao, Yan-Qing Hong, Jian-Hua Yin","doi":"10.1364/JOSAA.595594","DOIUrl":"https://doi.org/10.1364/JOSAA.595594","url":null,"abstract":"In a free-space optical (FSO) communication network, the optical signal suffers from turbulence-induced fading, which leads to serious performance distortion. To address this challenge, we propose a channel correlation-aware deep Q-network (CCA-DQN)-based adaptive transmission algorithm. This technique constructs a joint state space by leveraging the Pearson correlation coefficient related to the zenith angle and the downlink received signal strength, enabling the agent to learn transmit power decisions without requiring explicit uplink state feedback. The optimization objective is formulated as minimizing the average transmit power under the constraint of long-term average bit error rate (BER). Recognizing that average BER merely characterizes transmission quality in statistical significance, the outage probability is further introduced as a complementary reliability metric to evaluate the link survivability under deep fading scenarios. Simulation results demonstrate that, compared to baseline methods of max transmit power, random transmit power, truncated channel inversion, feedback-based moving-average power control, and DQN without CCA, the proposed approach reduces the average transmit power by approximately 60% while maintaining the average BER at the order of 10-5, and its outage probability performance approaches that of max transmit power.","PeriodicalId":17382,"journal":{"name":"Journal of The Optical Society of America A-optics Image Science and Vision","volume":"43 8","pages":"1161-1169"},"PeriodicalIF":1.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149167870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantitative phase retrieval of the boundary diffraction wave emanated from a straight edge using a diffraction Lloyd mirror interferometer. 用衍射劳埃德镜干涉仪定量反演从直边发射的边界衍射波的相位。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.590567

Monika Rani, Nitin Dubey, Raj Kumar

引用次数: 0

Optical architectures for information processing: advances in pattern recognition, phase imaging, and image encryption. 用于信息处理的光学体系结构：模式识别、相位成像和图像加密的进展。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.595905

Jyoti Bikash Mohapatra, Akash Pal, Ram Kumar, Rahul Kumar, Sonu Kumar Rao, Shivam Tripathi, Naveen K Nishchal

{"title":"Optical architectures for information processing: advances in pattern recognition, phase imaging, and image encryption.","authors":"Jyoti Bikash Mohapatra, Akash Pal, Ram Kumar, Rahul Kumar, Sonu Kumar Rao, Shivam Tripathi, Naveen K Nishchal","doi":"10.1364/JOSAA.595905","DOIUrl":"https://doi.org/10.1364/JOSAA.595905","url":null,"abstract":"Optical information processing is a powerful paradigm due to its inherent parallelism, high speed, and multidimensional processing capability. This study provides a comprehensive overview of optical architectures for information processing, with particular focus on optical pattern recognition, phase retrieval techniques, and optical security frameworks. Optical correlators are among the most significant implementations of optical information processing for pattern recognition. They can correlate vast amounts of data simultaneously by exploiting the inherent parallelism of light, enabling processing at the speed of light. The unparalleled computational capability surpasses the performance limits of conventional electronic processors, making optical correlators highly suitable for real-time and high-throughput pattern recognition applications. Various parameters of the optical field provide distinctive and versatile means to encode information. Properties such as amplitude, phase, polarization, wavelength, and orbital angular momentum enable multidimensional data representation, thereby enhancing encoding capability, security, and transmission efficiency. Further, optical imaging techniques have advanced significantly, delivering improved resolution, contrast, and functional imaging capabilities. A significant contribution to this progress comes from phase retrieval techniques, which reconstruct phase information from intensity-only measurements. Collectively, these approaches demonstrate the potential of hybrid optical-digital systems for next-generation imaging and information processing applications.","PeriodicalId":17382,"journal":{"name":"Journal of The Optical Society of America A-optics Image Science and Vision","volume":"43 8","pages":"D104-D118"},"PeriodicalIF":1.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149164719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coherence modulation in the interference of random electromagnetic beams. 随机电磁波束干扰中的相干调制。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.599317

Kaisa Rantaeskola, Andreas Norrman, Yahong Chen, Ari T Friberg, Tero Setälä

引用次数: 0

Self-referencing collimation metrology using path-tunable single-beam interferometry. 采用路径可调谐单光束干涉法的自参考准直测量。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.595560

Raj Kumar, Rajiv Dubey

{"title":"Self-referencing collimation metrology using path-tunable single-beam interferometry.","authors":"Raj Kumar, Rajiv Dubey","doi":"10.1364/JOSAA.595560","DOIUrl":"https://doi.org/10.1364/JOSAA.595560","url":null,"abstract":"Optical beams of different coherence lengths are used in many optical precision metrological instruments. Knowledge about the collimation properties of these beams is of immense importance for achieving accurate quantitative measurements. Most of the precise collimation testing techniques are based on interferometry. To generate high contrast interference fringes, the optical path difference between the interfering beams must be less than the coherence length of the test beam. Most of the interferometric setups reported for collimation testing are of fixed path length, making it cumbersome to test beams of different coherence lengths. We report a collimation measurement technique based on path-tunable single-beam interferometry using just two axially aligned holographic optical elements (HOEs). This simple lateral shearing system could test the collimation properties of beams having different coherence lengths. The path length between the interfering beams, according to the coherence length of the test beam, is varied by simply translating one of the HOEs along the direction of beam propagation. This system also generates an inherent self-reference fringe pattern for visual collimation inspection. The system is described and validated by testing the collimation properties of three beams having different coherence lengths.","PeriodicalId":17382,"journal":{"name":"Journal of The Optical Society of America A-optics Image Science and Vision","volume":"43 8","pages":"D149-D156"},"PeriodicalIF":1.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149167549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bayesian approach to slanted-edge modulation transfer function measurements for lens and pixel-sensor systems. 透镜和像素传感器系统斜边调制传递函数测量的贝叶斯方法。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.603040

Bernard Delley, Yves L Delley

{"title":"Bayesian approach to slanted-edge modulation transfer function measurements for lens and pixel-sensor systems.","authors":"Bernard Delley, Yves L Delley","doi":"10.1364/JOSAA.603040","DOIUrl":"https://doi.org/10.1364/JOSAA.603040","url":null,"abstract":"The Bayesian approach to slanted-edge modulation transfer function (MTF) measurements addresses several limitations inherent to the traditional methods. It effectively eliminates the need to differentiate noisy data, which typically require binning, smoothing, or data regularization techniques. Direct incorporation of the optical transfer function (OTF) into the parameter set allows for a more accurate fit to the measured data. The mathematical framework of this approach inherently includes the propagation of measurement noise to the resulting OTF and MTF, ensuring that the propagation of statistical errors is well understood. In addition, the method mitigates a small systematic error at the zero-frequency limit, which is commonly encountered in slanted-edge measurements. Although slanted-edge methods can be applied to a wide range of slant angles, we also demonstrate how problematic angles can be easily identified and addressed during the analysis of the edge image. The proposed method offers a significant improvement in precision at higher spatial frequencies, achieving uncertainties in the normalized MTF measurement of less than two percent point RMS up to the diffraction-limited cutoff, with typical data collection methods.","PeriodicalId":17382,"journal":{"name":"Journal of The Optical Society of America A-optics Image Science and Vision","volume":"43 8","pages":"1202-1209"},"PeriodicalIF":1.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149170165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unified variational framework for simultaneous correction of non-uniform sampling and diffraction-induced slope errors in coherence scanning interferometry. 相干扫描干涉测量中非均匀采样和衍射引起的斜率误差同步校正的统一变分框架。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.601571

Yulan Chen, Anqi Liu, Yiwei Hao, Jiaqi He, Wenxi Zhang

{"title":"Unified variational framework for simultaneous correction of non-uniform sampling and diffraction-induced slope errors in coherence scanning interferometry.","authors":"Yulan Chen, Anqi Liu, Yiwei Hao, Jiaqi He, Wenxi Zhang","doi":"10.1364/JOSAA.601571","DOIUrl":"https://doi.org/10.1364/JOSAA.601571","url":null,"abstract":"Coherence scanning interferometry (CSI) enables non-contact surface measurement with high axial resolution, but its accuracy is degraded in practical complex-surface metrology by two coupled effects: vibration-induced non-uniform axial sampling and diffraction-induced slope/edge errors. Axial-position sensing can provide frame-wise scanning positions, but it does not correct the optical-transfer-function degradation caused by finite-aperture imaging. Conversely, conventional inverse filtering compensates for diffraction-related attenuation but usually assumes uniform axial sampling. This paper proposes a unified variational reconstruction framework that incorporates measured non-uniform axial positions into an NUFFT-based CSI forward model with sparse regularization. The proposed method jointly models non-uniform sampling and optical-transfer-function degradation, and is evaluated against uniform-sampling inverse filtering, non-uniform least-squares phase recovery, and a two-step adjoint-NUFFT/IF baseline. Numerical simulations demonstrate improved robustness under strong sampling non-uniformity, residual axial-position errors, detector noise, and varying spectral widths. For the tested step sample, the proposed method achieves a step-height error of 0.052 nm and suppresses directional batwing artifacts to approximately the nanometer level. GPU implementation on an NVIDIA RTX 5070 Ti processes a representative 400×400×500 volume in 8.929 s, with only about 12.5% overhead relative to the two-step adjoint-NUFFT/IF baseline. These results indicate that the proposed framework is promising for calibrated CSI systems with available frame-wise axial positions.","PeriodicalId":17382,"journal":{"name":"Journal of The Optical Society of America A-optics Image Science and Vision","volume":"43 8","pages":"1176-1193"},"PeriodicalIF":1.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149168326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Propagation through and characterization of atmospheric and oceanic phenomena: introduction. 大气和海洋现象的传播和特性：导论。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.608761

Santasri Bose-Pillai, Szymon Gladysz, Nathaniel Ferlic, Victor Kulikov, N Anand

引用次数: 0

Optics in South Asia: introduction. 南亚的光学：导论。

IF 1.5 3区物理与天体物理

Journal of The Optical Society of America A-optics Image Science and Vision Pub Date : 2026-08-01 DOI: 10.1364/JOSAA.612772

Anurag Sharma, P Senthilkumaran, Kasturi Saha, Imrana Ashraf, Muhammad Anisuzzaman Talukder, Ashim Dhakal

{"title":"Optics in South Asia: introduction.","authors":"Anurag Sharma, P Senthilkumaran, Kasturi Saha, Imrana Ashraf, Muhammad Anisuzzaman Talukder, Ashim Dhakal","doi":"10.1364/JOSAA.612772","DOIUrl":"https://doi.org/10.1364/JOSAA.612772","url":null,"abstract":"This feature issue is motivated by a recent upswing in optical and photonic research in South Asia and its increasing influence on both the scientific community and regional economies. In response, JOSA A and JOSA B have launched this feature issue on Optics in South Asia, focusing on work from Bangladesh, India, Nepal, Pakistan, and Sri Lanka. To maintain the standards of JOSA A and JOSA B, all submissions underwent a rigorous peer-review process. The issue highlights ongoing outstanding research in optics and photonics in South Asia, covering topics that span the full scopes of both journals-from classical optics, image science, and vision (JOSA A) to fundamental studies of light-matter interaction, including quantum optics, nonlinear optics, and laser physics (JOSA B). In total, 94 manuscripts were submitted; following review, 19 papers were accepted in JOSA A and 51 in JOSA B, among which are eight invited review articles. This feature issue offers researchers in South Asia a platform to present their latest findings across the full breadth of optics, including emerging and rapidly evolving areas in the discipline.","PeriodicalId":17382,"journal":{"name":"Journal of The Optical Society of America A-optics Image Science and Vision","volume":"43 8","pages":"OSA1-OSA4"},"PeriodicalIF":1.5,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149167278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0