Jack Baker;Craig P. Allford;Sara Gillgrass;J. Iwan Davies;Samuel Shutts;Peter M. Smowton
{"title":"Thermal Performance of 940 nm AlGaAs-Based VCSELs Grown on Germanium","authors":"Jack Baker;Craig P. Allford;Sara Gillgrass;J. Iwan Davies;Samuel Shutts;Peter M. Smowton","doi":"10.1109/JPHOT.2025.3552951","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3552951","url":null,"abstract":"VCSEL thermal resistances are determined from power-current-voltage-wavelength measurements performed on nominally identical epitaxial structures grown on Ge and GaAs substrates. We show that the effective thermal conductivity of the VCSEL is increased when grown on Ge substrates.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 2","pages":"1-4"},"PeriodicalIF":2.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10933508","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761370","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":"Orbital Angular Momentum Modes Recognition Method Based on Transfer Learning","authors":"Tianyu Du;Jun Ou;Hao Chi;Bo Yang;Shuna Yang;Yanrong Zhai","doi":"10.1109/JPHOT.2025.3547382","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3547382","url":null,"abstract":"During the transmission of vortex beams in free-space optical communication channels, atmospheric turbulence causes wavefront phase disturbances, making identifying orbital angular momentum (OAM) modes more difficult. Additionally, the model requires extensive training datasets, which significantly prolongs the training time. In this paper, a method combining transfer learning with an improved convolutional neural network (CNN) is proposed to identify the OAM modes of distorted vortex beams. Compared to methods without transfer learning, this approach maintains higher accuracy while significantly reducing the training time and computational resources required. Furthermore, the impact of the model on OAM modes recognition accuracy is analyzed under varying atmospheric turbulence intensities and propagation distances, with comparisons made against traditional CNN models and the CNN models of other literature. To verify the recognition performance of the proposed model under adverse weather conditions, the impact of varying rainfall intensity and fog concentration on recognition accuracy was analyzed. In addition, the generalization ability of the model is evaluated after training on both single and mixed datasets. The results demonstrate that the recognition accuracy of the proposed method surpasses that of the traditional CNN models and the CNN models of other literature, achieving a 95.6% accuracy after 3 km of propagation under strong turbulence. Under strong turbulence, heavy rainfall, and heavy fog, the recognition accuracy at 1 km is 89.4% and 88.7%, respectively. Additionally, the model trained on the mixed dataset achieves a recognition accuracy of 97.08%, indicating robust generalization capability. The method proposed in this paper achieves high recognition accuracy while effectively reducing computational resources and training time, which is of great significance to the research on OAM modes recognition.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 2","pages":"1-10"},"PeriodicalIF":2.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10933501","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800771","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":"New Paradigm for Beehive Monitoring System Using Infrared and Power Line Communication","authors":"Da-Huei Lee;Wei-Wen Hu;Yuan-Long Lee;Tai-Yu Chen","doi":"10.1109/JPHOT.2025.3552600","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3552600","url":null,"abstract":"In recent years, smart beehive monitoring has attracted attention due to its highly profitable industry. However, colony collapse disorder (CCD) syndrome, which is described by the sudden disappearance of the bee colony, severely affects the honey bee industry in most countries of the world. The causes of CCD are not verified, but electromagnetic interference (EMI) is the possible one that appears in most beehive monitoring systems. Based on this motivation, this paper presents a new paradigm for beehive monitoring utilizing the proposed system consisting of a host module, multiple sensor modules, and relay modules. Each sensor module is responsible for collecting the in-hive parameters of each beehive such as temperature, humidity, hive weight, carbon dioxide, oxygen, and entrance counts. The collected sensor data are then transmitted to the relay module by infrared (IR) communication to avoid EMI. The relay module integrates the IR receiver and power line communication (PLC) transmitter technologies, where the former is used to receive optical signals with in-hive parameters, and the latter is used to transform the abovementioned signals into PLC interface. Moreover, a host module is introduced to aim at receiving the signals from multiple relay modules by the PLC interface. The distances of IR communication and PLC are determined through simulation results under the target bit error rate of <inline-formula><tex-math>$10^{-3}$</tex-math></inline-formula> to provide accurate in-hive parameters with negligible interference from multiple beehives. Experimental results also show that the proposed system could meet the requirements of real-time and long-term data collection and transmission.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 2","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10930752","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748826","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":"Temperature-Insensitive Second-Order Microring Resonator for Dense Wavelength Division Multiplexing (DWDM)","authors":"Fuling Wang;Xiao Xu;Chonglei Sun;Liuge Du;Jia Zhao","doi":"10.1109/JPHOT.2025.3552080","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3552080","url":null,"abstract":"To achieve temperature-insensitive passband responses of microring resonator (MRR) for DWDM signal processing, we design and fabricate a wavelength division multiplexer with four channels based on 2nd-order slot MRR with PMMA cladding layer. Four filters with different radii are connected in series to realize 1.5-nm channel space. In the process of design and optimization, the dense wavelength demultiplexer (DEMUX) exhibits admirable responses with broad 1-dB bandwidth (>0.64 nm, accounting for 43% of the channel spacing), steep band edge (shape factors ∼0.47) and high temperature stability (temperature-dependent wavelength shift (TDWS) < 0.25 pm/°C, which is 0.4% of ordinary MRR). Then the device is fabricated and measured. The box-type responses are obtained for all 4 wavelength channels. The measured 1-dB bandwidth is 1.1 nm and the shape factor is larger than 0.35. Due to the fabrication imperfections and process errors, the central wavelengths shifted from ideal values. The measured TDWS is less than 24.8 pm/°C, which is deteriorated from the design due to the incomplete filling of the PMMA cladding in the slot. Even so, the decrease of the TDWS, combined with the box-type response of 1-dB bandwidth of 1.1 nm in our design, makes the DEMUX tolerate the temperature variation of larger than ±22 °C without the help of electrical temperature control. The results indicate the great potential of the designed device for DWDM applications.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 2","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10930515","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769378","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}
Cheng-Bo Zhao;Yi-Jian Liu;Yuan-Yi Huang;Xiao-Tian Zhang;Yan Xing;Qiong-Hua Wang
{"title":"Photonics Breakthroughs 2024: Large-Viewing-Angle Light Field 3D Display Based on High-Precision Beam Directionality","authors":"Cheng-Bo Zhao;Yi-Jian Liu;Yuan-Yi Huang;Xiao-Tian Zhang;Yan Xing;Qiong-Hua Wang","doi":"10.1109/JPHOT.2025.3551384","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3551384","url":null,"abstract":"Light field 3D display technology provides viewers with a highly realistic stereoscopic visual experience and achieves authentic and comfortable glasses-free 3D display effects. In recent years, it has become a prominent research focus in the field of display technology. However, light field 3D display is still constrained by the challenges of limited viewing angle and resolution, which significantly impede its advancement. This paper presents a large-viewing-angle light field 3D display based on high-precision beam directionality. To enhance the resolution of 3D images within large viewing range, a highly directional light beam with a divergence angle of ±2.7° is achieved by optimizing the display light sources with a compound microlens array. Additionally, a lenticular lens array is employed to reconstruct densely arranged light fields and achieve a large viewing angle. In the experiments, a 100° viewing angle is achieved and it maintains correct geometric occlusion relationships and smooth motion parallax. In addition, the display has a compact architecture and is suitable for the full-color and switchable dynamic light field 3D display with refresh rate of 30 Hz. We expect the proposed display will contribute to the further development of light field 3D displays.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 3","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10925629","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835462","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}
Paul G. Sibley;Justin Wong;Malcolm B. Gray;Jong H. Chow;Chathura P. Bandutunga
{"title":"Digital Interferometric Open Loop Phase Recovery in a Fiber Optic Gyroscope","authors":"Paul G. Sibley;Justin Wong;Malcolm B. Gray;Jong H. Chow;Chathura P. Bandutunga","doi":"10.1109/JPHOT.2025.3551278","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3551278","url":null,"abstract":"We present the first use of a Digitally Enhanced Homodyne readout on a Sagnac interferometer, demonstrating the technique's capability as a readout method for high dynamic range, open loop interferometric fiber optic gyroscopes. We achieve an optical phase noise floor of 0.7 <inline-formula><tex-math>$mu$</tex-math></inline-formula>rad/<inline-formula><tex-math>$sqrt{text{Hz}}$</tex-math></inline-formula>, and phase linearity of 8 ppm demonstrated over a phase dynamic range of <inline-formula><tex-math>$16pi$</tex-math></inline-formula>. We rotation calibrate the system using a rate table, confirming an angular random walk (ARW) of 0.0014 deg/<inline-formula><tex-math>$sqrt{text{hr}}$</tex-math></inline-formula>, bias instability of 0.012 deg/hr.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 2","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10925622","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716441","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":"Generation of Tunable Correlated Frequency Comb via Four-Wave-Mixing in Optical Fibers","authors":"Aryan Bhardwaj;Debanuj Chatterjee;Ashutosh Kumar Singh;Anil Prabhakar","doi":"10.1109/JPHOT.2025.3550712","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3550712","url":null,"abstract":"We report an all-fiber-based experimental setup to generate a correlated photon-pair comb using Four Wave Mixing (FWM) in Highly non-linear fiber (HNLF). Temporal correlations of the generated photons were confirmed through coincidence measurements. We observed a maximum of 32 kcps, with a coincidence to accidental ratio of <inline-formula><tex-math>$17 pm 1$</tex-math></inline-formula>. To further understand the underlying processes, we also simulated a generalized FWM event involving the interaction between an arbitrary frequency comb and a Continuous Wave (CW) pump. non-linear dynamics through the HNLF were modelled using Schrödinger propagation equations, with numerical predictions agreeing with our experimental results.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 3","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924403","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840120","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":"Reservoir Computing for Few-Mode Fiber Channel OSNR Monitoring in Deep Learning Frameworks","authors":"Jianjun Li;Tianfeng Zhao;Baojian Wu;Kun Qiu;Feng Wen","doi":"10.1109/JPHOT.2025.3550505","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3550505","url":null,"abstract":"This paper presents a novel optical performance monitoring (OPM) scheme based on reservoir computing (RC) and Resnet network for monitoring the optical signal-to-noise ratio (OSNR) of few-mode transmission channels, without the need for any demodulation process. By using 300 RC nodes, the number of floating-point operations (FLOPs) is reduced by 75%, with almost no change in prediction accuracy compared to a network without RC. In a system ranging from 0 to 30 dB, 40 simulation runs yield an OSNR prediction accuracy band around 0.9900. We also investigate the prediction accuracy when using different spectral information, with results showing that frequency-domain information effectively captures the characteristics of both signal and noise. Additionally, we examine the impact of different mode combinations on OSNR prediction accuracy and find that the prediction performance is nearly unaffected by the mode combination.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 2","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10923712","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698239","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}
Ziting Pan;Yuting Li;Yijie Shen;Ziqiang Li;Guan Huang;Chao Geng;Xinyang Li
{"title":"Multi-Aperture Adaptive Fiber-Coupled Free-Space Optical Communication System: Scintillation Mitigation and Turbulence Compensation Experiment Based on Gamma-Gamma Channel Modeling","authors":"Ziting Pan;Yuting Li;Yijie Shen;Ziqiang Li;Guan Huang;Chao Geng;Xinyang Li","doi":"10.1109/JPHOT.2025.3550789","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3550789","url":null,"abstract":"Free-space optical communication is an effective alternative solution to address the “last mile” bottleneck in fiber-optic communication systems. However, its practical performance is significantly affected by phase perturbations and intensity scintillation induced by atmospheric turbulence effects. This paper proposes a multi-aperture adaptive fiber-coupled communication architecture, systematically investigating the optical transmission characteristics in turbulent channels through a combined approach of theoretical modeling and experimental validation. Utilizing the Gamma-Gamma turbulence channel model, quantitative analyses are conducted to elucidate the relationships between the scintillation index, the number of transmitting apertures, and the bit error rate. By establishing an outdoor 2.1 km experimental platform, we demonstrate that multi-aperture diversity transmission combined with closed-loop control reduces the scintillation index by 60% while achieving 10 Gbit/s error-free communication under weak turbulence conditions. Experimental results indicate that the proposed architecture enhances coupling power while maintaining high communication quality. Its modular design ensures high compatibility with mature fiber-optic communication components, providing a solution for constructing low-complexity, high-reliability hybrid optical communication systems in urban environments.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 2","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10923635","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769377","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}
Musa N. Hamza;Mohammad Tariqul Islam;Sunil Lavadiya;Iftikhar ud Din;Bruno Sanches;Slawomir Koziel;Syeda Iffat Naqvi;Abinash Panda;Mohammad Alibakhshikenari;B. Virdee;Md. Shabiul Islam
{"title":"Polarization-Insensitive Nano-Metamaterial Sensor With Near-Infrared μ and ϵ Negative Properties for Early Cancer Detection via Exosome Analysis (70 THz to 3 PHz)","authors":"Musa N. Hamza;Mohammad Tariqul Islam;Sunil Lavadiya;Iftikhar ud Din;Bruno Sanches;Slawomir Koziel;Syeda Iffat Naqvi;Abinash Panda;Mohammad Alibakhshikenari;B. Virdee;Md. Shabiul Islam","doi":"10.1109/JPHOT.2025.3549946","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3549946","url":null,"abstract":"Metamaterials (MTMs) have emerged as essential components in high-performance electromagnetic devices, including sensors and absorbers. This study presents a polarization-insensitive nano-metamaterial sensor with exceptional angular stability and a wide operating range of 70 THz to 3 PHz. The sensor achieves an average absorption rate of 97% across this range, making it highly suitable for applications in biomedical engineering. By integrating microwave imaging (MWI) techniques, the sensor can detect circulating cancer exosomes (CCEs) with high sensitivity, effectively distinguishing them from normal exosomes. Exhibiting double-negative MTM properties (negative permittivity and permeability) in the near-infrared (NIR) range (70 THz to 400 THz), the sensor enhances sensitivity for early cancer detection. A detailed analysis of its properties, including impedance (Z), phase, and S<sub>11</sub> parameters (real and imaginary components), demonstrates its superior performance. This non-invasive, label-free approach to detecting cancer biomarkers represents a significant step forward in advancing personalized healthcare.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 2","pages":"1-15"},"PeriodicalIF":2.1,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10919043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748925","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}