Mingdi Liu;Junzhao Liang;Yanxiong Wu;Zicong Luo;Rui Xie;Jiaxiong Luo;Lisong Yan
{"title":"Physics-Informed Decoupled Calibration for Fourier Ptychographic Microscopy","authors":"Mingdi Liu;Junzhao Liang;Yanxiong Wu;Zicong Luo;Rui Xie;Jiaxiong Luo;Lisong Yan","doi":"10.1109/JPHOT.2025.3587797","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3587797","url":null,"abstract":"Fourier ptychographic microscopy (FPM) is a promising quantitative phase imaging technique with large fields of view and high resolution, but it requires precise illumination angles for accurate reconstruction. Conventional algorithms struggle to rapidly separate system errors and impose strict constraints on imaging systems. To address this, we propose a physically decoupled correction framework integrating convolutional neural network (CNN), simulated annealing (SA) algorithms, and GPU parallel acceleration. The CNN extracts frequency-domain circular features related to LED positioning errors as physical priors, while the GPU-accelerated SA algorithm accurately solves LED array spatial parameters during FPM forward propagation. Because this method is decoupled from phase recovery, single-round calibration parameters apply to diverse conditions, reducing error correction time by >67.7% and improving imaging efficiency by >60.1%. Experiments verify its ability to precisely calibrate LED positions, enhancing FPM robustness and laying a solid algorithmic foundation for efficient full-field error correction.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-15"},"PeriodicalIF":2.4,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11077410","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Torrelli;M. C. G. Alasio;M. D'Alessandro;A. Gullino;L. Miri;J. Lindner;S. Gronenborn;M. Goano;P. Debernardi
{"title":"Modeling Self-Heating in High-Power Single-Mode Phase-Coupled Linear VCSEL Arrays","authors":"V. Torrelli;M. C. G. Alasio;M. D'Alessandro;A. Gullino;L. Miri;J. Lindner;S. Gronenborn;M. Goano;P. Debernardi","doi":"10.1109/JPHOT.2025.3587464","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3587464","url":null,"abstract":"We investigate the robustness of single-mode (SM) emission in high-power, large-area rectangular vertical-cavity surface-emitting lasers (VCSELs), emphasizing the impact of self-heating effects. Compared to circular geometries, large-area rectangular VCSELs provide improved heat dissipation thanks to their high geometrical aspect ratio, and higher SM output power by means of their patterned reflectivity obtainable by an array of grating reliefs. Self-heating alters the refractive index of the device. We demonstrate, experimentally and numerically, how the related thermal lensing affects the transverse modes. By misaligning the antinodes of the promoted lasing mode and the surface reliefs, self-heating degrades SM operation if not properly accounted for in the relief position design. Combining thermal and optical models, we propose numerically optimized grating relief geometries ensuring robust SM emission across varying operating temperatures.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11074750","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An InGaAsSb Based 640 × 512 Focal Plane Array With Low Surface Leakage Current for Extended Shortwave Detection","authors":"Ruoyu Xie;Yifan Shan;Lingze Yao;Donghai Wu;Xiangbin Su;Hongyue Hao;Dongwei Jiang;Mengqi Yang;Ye Zhang;Hui Xie;Guowei Wang;Yingqiang Xu;Haiqiao Ni;Zhichuan Niu","doi":"10.1109/JPHOT.2025.3586862","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3586862","url":null,"abstract":"An extended-wavelength InGaAsSb focal plane array (FPA) with a 15 μm pixel pitch, 640 × 512 format, and a cutoff wavelength of 3.22 μm is demonstrated. Through the atomic layer deposition Al<sub>2</sub>O<sub>3</sub> passivation technology, the natural oxide leakage channel is reduced and the leakage current of the device is well suppressed. The optoelectronic performance of the FPA is close to that of the large-scale test unit. At 180 K, the quantum efficiency of the FPA is 45.6% and the dark current is about 2.76 × 10<sup>−5</sup> A/cm<sup>2</sup>. Laboratory imaging shows potential for applications at temperatures above 200 K.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11072720","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144716201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Enhancing Light Extraction Efficiency in Micro-LEDs via Metal Photonic Crystals in the Passivation Layer and Air Photonic Crystals on the n-GaN Side","authors":"Zhaoyong Liu;Gaoyu Dai;Kailin Ren;Luqiao Yin;Jianhua Zhang","doi":"10.1109/JPHOT.2025.3585633","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3585633","url":null,"abstract":"Photonic crystals (PhCs), as a type of metamaterial, have attracted significant attention due to their ability to control light propagation to enhance the light extraction efficiency (LEE) of Micro-LEDs. However, the current advancements in improving the LEE of Micro-LED with PhCs are far from 100%, and the manufacturing process for the designed optical structures is overly complex. In this work, an optical structure design requiring a simpler manufacturing process, involving metal PhCs in the passivation and air PhCs on the n-GaN side, is proposed and investigated for application in flip-chip Micro-LEDs to enhance LEE. The influence of parameters related to PhCs on LEE is investigated and analyzed using finite difference time domain simulations. Enhanced LEE is observed through the optimization of parameters such as the shape, period, height, and duty cycle of the PhCs. Under the conditions of an Ag reflector with conical Ag PhCs in the passivation layer and air conical photonic crystals on the n-GaN side, a high LEE of 81.5% is achieved, representing a 2.63-fold increase compared to the LEE of flip-chip Micro-LEDs with vertical sidewalls and Al reflector.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-12"},"PeriodicalIF":2.1,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11068123","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144716181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gangmin Li;Shihan Hong;Long Zhang;Zixu Xu;Daoxin Dai
{"title":"Ultra-Low-Loss Silicon Photonic Waveguides Operating With the Wavelength-Bands of 1.31/1.55/2 μm","authors":"Gangmin Li;Shihan Hong;Long Zhang;Zixu Xu;Daoxin Dai","doi":"10.1109/JPHOT.2025.3584956","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3584956","url":null,"abstract":"Silicon photonics is developing rapidly for the operation at the wavelength-bands of 1.31/1.55 μm as well as 2 μm. One of the most fundamental tasks is to develop low-loss silicon photonic waveguides, which are crucial for various photonic integrated circuits used in optical gyroscopes, tunable delay-line arrays and high-Q resonators, etc. Here silicon photonic waveguides work with ultra-low propagation losses in the wavelength-bands of not only 1.31/1.55 μm but also 2 μm are designed and demonstrated for the first time. Long waveguide spirals are designed optimally according to the comprehensive theoretical analysis, and the measured propagation losses of the fabricated waveguides are about 0.18, 0.13 and 0.07 dB/cm at the wavelength-bands of 1.31, 1.55, and 1.91 μm, respectively, which agrees well with the theoretical prediction. The total propagation loss is reduced greatly by more than a half for achieving the same time delay when using the wavelength of 1.91 μm than the wavelength of 1.31 μm.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11063335","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiayuan Lin;Qi Yu;Meng Teng;Xinmin Ding;Detang Xiao;Wenbo Wan;Qiegen Liu
{"title":"Mean-Reverting Diffusion Model-Enhanced Scattering Imaging","authors":"Jiayuan Lin;Qi Yu;Meng Teng;Xinmin Ding;Detang Xiao;Wenbo Wan;Qiegen Liu","doi":"10.1109/JPHOT.2025.3584754","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3584754","url":null,"abstract":"Scattering media disrupt the rectilinear propagation of light, significantly degrading the resolution and clarity of optical imaging systems. Current scattering imaging techniques usually focus on simple targets and present limitations in imaging quality and reconstruction efficiency. To address these limitations, a mean-reverting diffusion model-enhanced scattering imaging (MRDS) is proposed. During training, prior information is extracted by diffusing the training data into an intermediate state with stable Gaussian noise. Reconstruction begins with low-quality images from physically-guided inversion, followed by iterative solving of reverse-time stochastic differential equations via the Euler-Maruyama method, integrating learned prior information to efficiently reconstruct high-quality images. Simulative and experimental validations demonstrate that MRDS outperforms traditional methods in reconstructing images with fewer artifacts and enhanced detail clarity. Quantitative metrics further demonstrates excellent reconstruction performance, with average metrics reaching 41.19 dB for PSNR, 0.99 for SSIM and 0.0085 for LPIPS. The reconstruction time per image is 2.19 seconds, representing a 44.2-fold acceleration compared to conventional methods. The proposed method achieves high-quality reconstructions of complex targets in a significantly shorter time, which dramatically boosts the efficiency of scattering imaging.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11061784","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144641079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparisons of Optical Properties of Glucose Sensing by Mueller Matrix Polarimetry Using Infrared and Visible Wavelengths","authors":"Yu-Ren Chen;Yu-Lung Lo;Wei-Chun Hung","doi":"10.1109/JPHOT.2025.3584221","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3584221","url":null,"abstract":"A Mueller matrix polarimetry system with 1650 nm wavelength is developed to extract the mean absorbance and anisotropic properties of turbid media as an enabling technology for non-invasive glucose sensing. It shows that the mean absorbance (<inline-formula><tex-math>${{A}_e}$</tex-math></inline-formula>), depolarization index (<italic>Δ</i>), and optical rotation (<italic>γ</i>) vary linearly with the glucose concentration. These findings highlight the interdependence of these parameters and their significance in characterizing the optical properties of glucose. Moreover, when conducting human testing, it was observed that glucose exhibited a notable time delay at the 532 nm wavelength instead of the 1650 nm wavelength. Furthermore, it was observed that the absorption of glucose at 532 nm is lower than at 1650 nm. Regarding the optical rotation, the response at 1650 nm is much clearer than that at 532 nm. This can be explained by the fact that the optical rotation reaction at 532 nm is more susceptible to interference from other interfering substances than at 1650 nm, leading to cancellation of each other out. As a result, the mean absolute relative deviation (MARD) value for the polarimetric system at 1650 nm wavelength is 1.8334%, and the correlation coefficient (R<sup>2</sup>) value for 1650 nm wavelength is 0.97629. It is found that the MARD and R<sup>2</sup> values for the polarimetric system at 532 nm wavelength, developed by the same group, have poorer results in terms of system accuracy and the linear relationship of the model, respectively. These observations suggest that using 1650 nm is more effective in accurately predicting the behavior of glucose in human tests.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11059274","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144646506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Distributed Compensation With Parallelizability for Polarization Mode Dispersion Based on Learned Digital Backpropagation","authors":"Daobin Wang;Guangfu Li;Hui Yang;Wei Li;Ruiyang Xia;Chengqi Duan;Jianming Shang;Zanshan Zhao;Guanjun Gao","doi":"10.1109/JPHOT.2025.3584781","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3584781","url":null,"abstract":"This study proposes a learned digital backward propagation (LDBP) algorithm that performs a distributed compensation of polarization mode dispersion (PMD) in parallel. The proposed LDBP algorithm uses the regular perturbation theory of a fiber-optic nonlinear Schrödinger equation to create a deep neural network (DNN) with full parallelization capabilities. The proposed algorithm’s nonlinear compensation (NLC) performance is evaluated using numerical experiments on a 1,000-kilometer standard single-mode fiber link. The link uses a dense wavelength division multiplexing (DWDM) system with five wavelength channels, 64-QAM modulation, and a symbol rate of 32 GBaud/s per channel. The experimental results demonstrate that, even for low-complexity network training with identical optical power, the proposed method can provide a performance improvement of approximately 0.4 dB over lumped compensation methods. This indicates that parallelization, which improves the efficiency of NLC execution, does not reduce the proposed method’s advantage over lumped compensation methods. Finally, the improvement of the computational efficiency caused by parallelization is investigated. The results show that parallelization improves computational efficiency by about 67 times compared to serial execution. The findings of this paper provide a feasible solution for implementing NLC, which can significantly improve hardware efficiency in practice.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11060826","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lei Chen;Lei Zhu;Heng Du;Xiangyu Wang;Shiyang Shen;Yihao Wang;Shan Zhao;Xiaodong Wang
{"title":"Pointing Acquisition and Tracking System for Free Space Optical Communication Based on Integrated Optical Phased Array","authors":"Lei Chen;Lei Zhu;Heng Du;Xiangyu Wang;Shiyang Shen;Yihao Wang;Shan Zhao;Xiaodong Wang","doi":"10.1109/JPHOT.2025.3582266","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3582266","url":null,"abstract":"With proliferation of low-earth-orbit satellite (LEOs) constellations, air-to-space laser communications have the potential to realize aircraft broadband Internet services due to its high speed and low latency. A major challenge in aircraft to LEOs laser link is the fast scanning, high-bandwidth pointing acquisition tracking (PAT) approach to achieve rapid link establishment and handover as well as to compensate for errors caused by vibrations of the aircraft platform. In this paper, a PAT system based on integrated optical phased array (OPA) and four quadrant detector (QD) is demonstrated. Rapid azimuth beam scanning is achieved by controlling the OPA’s 512 thermal phase shifters, while elevation scanning is carried out by adjusting the laser’s wavelength. The arrival angle of the incident beacon is measured by QD and used to adjust the emission direction through FPGA. The experiment shows that the beam steering rise time is less than 60 μs in azimuth and 46 μs in elevation, while the pointing accuracy is <0.05°>2.5 kHz. The PAT system has low complexity, small size, mechanical-free beam agility steering, and high tracking bandwidth capability.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11048403","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ultrawide Dynamic Bandwidth Modulation of an Antiresonant Nanoweb Hollow-Core Fiber","authors":"Ricardo E. da Silva;Cristiano M. B. Cordeiro","doi":"10.1109/JPHOT.2025.3581681","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3581681","url":null,"abstract":"We experimentally demonstrate an acoustically modulated antiresonant nanoweb hollow-core fiber (N-HCF) for the first time. The N-HCF contains two off-center air cores with a diameter difference of 5 μm, separated by a nanoweb of silica. We analytically simulate the influence of the N-HCF’s core diameter, cladding wall, and nanoweb thicknesses on the confinement losses, effective indices, and beatlengths of the guided fundamental (HE11) and higher-order modes (TE01, TM01), from 750 to 1200 nm. The phase-matching of the acoustic waves and modal beatlengths is also estimated and discussed. The fabricated 3.6 cm long acousto-optic device modulates record-wide bandwidths (up to 450 nm) while providing high modulation depths (up to 8 dB) at low drive voltages (10 V). Simulated and measured results provide useful insights for designing, modeling, and characterizing the N-HCF’s transmission spectrum and modulation performance. These achievements lead to highly efficient, compact, and fast all-fiber sensors and modulators promising for application in pulsed fiber lasers.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11045409","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144550521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}