2022
2022
-
Record 289 of
Title:Design and optimization of a support system for large aperture wedge prisms based on an integrated opto-mechanical analysis
Author(s):Wen, Wansha(1,2,3); Ruan, Ping(2,3); Lv, Tao(1,2,3); Li, Baopeng(1,2)Source: Optics Express Volume: 30 Issue: 19 DOI: 10.1364/OE.471819 Published: September 12, 2022Abstract:A stable and reliable support system for large aperture wedge prisms is the priority of the atmospheric dispersion corrector (ADC). The prism is not a rotationally symmetric component, and the stress distribution on large aperture wedge prisms caused by the support system is different compared with the rotationally symmetric mirror. A scheme of support forces passing through the prism center of gravity (COG) is proposed in this paper. Comparing with the scheme of support force passing through the prism geometry center of rotation (COR) under the same conditions, the root-mean-square (RMS) value of the optical surface shape error shows that the proposed scheme obtains better optical surface quality when the prism rotates from 0° to 360° under the conditions of gravity coupling at 2°C and 42°C. In addition, based on the proposed scheme, a multi-island genetic algorithm (MIGA) is used to optimize the position parameters of the supports. The results show that the RMS value of the optical surface deformation of the wedge prism decreases effectively. Under the conditions of gravity coupling at temperatures of 2°C and 42°C, the RMS value decreases from 260.7 nm to 107.8 nm with 58.6% and from 108.6 nm to 69.5 nm with 36.0%, respectively. ? 2022 Optica Publishing Group.Accession Number: 20223712736215 -
Record 290 of
Title:Scalable colored sub-ambient radiative coolers based on a polymer-Tamm photonic structure
Author(s):Huang, Tianzhe(1,3); Chen, Qixiang(2); Huang, Jinhua(1); Lu, Yuehui(1); Xu, Hua(2); Zhao, Meng(4); Xu, Yao(5); Song, Weijie(1)Source: arXiv Volume: Issue: DOI: 10.48550/arXiv.2207.10957 Published: July 22, 2022Abstract:Daytime radiative coolers cool objects below the air temperature without any electricity input, while most of them are limited by a silvery or whitish appearance. Colored daytime radiative coolers (CDRCs) with diverse colors, scalable manufacture, and sub-ambient cooling have not been achieved. We introduce a polymer-Tamm photonic structure to enable a high infrared emittance and an engineered absorbed solar irradiance, governed by the quality factor (Q-factor). We theoretically determine the theoretical thresholds for sub-ambient cooling through yellow, magenta, and cyan CDRCs. We experimentally fabricate and observe a temperature drop of 2.6-8.8 °C on average during daytime and 4.0-4.4 °C during nighttime. Furthermore, we demonstrate a scalable-manufactured magenta CDRC with a width of 60 cm and a length of 500 cm by a roll-to-roll deposition technique. This work provides guidelines for large-scale CDRCs and offers unprecedented opportunities for potential applications with energy-saving, aesthetic, and visual comfort demands. ? 2022, CC BY.Accession Number: 20220305894 -
Record 291 of
Title:Design of cryogenic long-wave infrared detection system
Author(s):Hongwei, Zhang(1,2,3); Weining, Chen(3); Rui, Qu(3); Yingjun, Ma(3); Yalin, Ding(1); Haifeng, Xu(4)Source: Journal of Physics: Conference Series Volume: 2295 Issue: 1 DOI: 10.1088/1742-6596/2295/1/012008 Published: 2022Abstract:To address the demand for detection of point / dim targets in complex environments, a cryogenic long-wave infrared detection system was designed. In order to improve the target detection capability, the system adopts high-order aspheric surfaces to reduce the number of optical lenses and improve the system transmittance. At the same time, it corrects on-axis / off-axis aberrations and advanced aberrations to improve the imaging quality of the system. In order to effectively reduce the background radiation and improve the system signal-to-noise ratio, the system adopts cryogenic optical technology. Through the scheme design and calculation analysis of the active refrigeration unit, the requirements of the overall and optical technical indicators are met. The outline of the aircraft image obtained by the field experiment is clear and distinguishable, which meets the requirements of target detection. The system has a good application prospect in the field of infrared imaging in early warning systems. ? Published under licence by IOP Publishing Ltd.Accession Number: 20223012391078 -
Record 292 of
Title:Multi-View Auxiliary Diagnosis Algorithm for Lung Nodules
Author(s):Qiu, Shi(1); Li, Bin(2); Zhou, Tao(3); Li, Feng(4); Liang, Ting(5)Source: Computers, Materials and Continua Volume: 72 Issue: 3 DOI: 10.32604/cmc.2022.026855 Published: 2022Abstract:Lung is an important organ of human body. More and more people are suffering from lung diseases due to air pollution. These diseases are usually highly infectious. Such as lung tuberculosis, novel coronavirus COVID-19, etc. Lung nodule is a kind of high-density globular lesion in the lung. Physicians need to spend a lot of time and energy to observe the computed tomography image sequences to make a diagnosis, which is inefficient. For this reason, the use of computer-assisted diagnosis of lung nodules has become the current main trend. In the process of computer-aided diagnosis, how to reduce the false positive rate while ensuring a low missed detection rate is a difficulty and focus of current research. To solve this problem, we propose a three-dimensional optimization model to achieve the extraction of suspected regions, improve the traditional deep belief network, and to modify the dispersion matrix between classes. We construct a multi-view model, fuse local three-dimensional information into two-dimensional images, and thereby to reduce the complexity of the algorithm. And alleviate the problem of unbalanced training caused by only a small number of positive samples. Experiments show that the false positive rate of the algorithm proposed in this paper is as low as 12%, which is in line with clinical application standards. ? 2022 Tech Science Press. All rights reserved.Accession Number: 20221712035711 -
Record 293 of
Title:Rocket Attitude Measurement Technology in Vertical Take-off Phase Based on Lidar
Author(s):Shi, Heng(1,2,3,4); Gao, Xin(1); Li, Xiyu(1); Lei, Chengqiang(1); Hu, Lei(1); Zong, Yonghong(1); Zheng, Donghao(1); Tang, Jia(1)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 51 Issue: 4 DOI: 10.3788/gzxb20225104.0412002 Published: April 25, 2022Abstract:The attitude measurement data in the vertical take-off phase of a rocket is of great significance to analyze the running orbit, aerodynamic parameters and flight control performance of rocket. The traditional attitude measurement of rocket vertical take-off phase mainly includes telemetry, optical measurement, and radar measurement. The violent vibration has a great impact on the attitude measurement accuracy of telemetry, and once the rocket takes-off fails, it is difficult for telemetry method to obtain effective original analysis data. Although the optical measurement accuracy is high, it needs to use multi station optical equipment to interpret the rocket attitude data after rendezvous, so the real-time performance is poor, and the optical equipment is vulnerable to the interference of weather environment and tail flame during take-off phase, so there is a risk of missing rendezvous data. Although radar measurement is little affected by weather conditions, it is easy to be disturbed by ground clutter. Therefore, there is no external real-time attitude measurement data in the rocket vertical take-off phase. It is urgent to fill the data gap in this phase through new measurement methods to ensure the safety of the rocket vertical take-off phase.Aiming at the technical problems of external real-time attitude measurement in rocket vertical take-off phase, considering the advantages of Lidar, such as high precision, all-time measurement, high resolution and not easily disturbed by environment, the real-time attitude measurement method in rocket vertical take-off phase based on Lidar is proposed in this paper. Raytheon intelligent MS03-A500 four wire Lidar is adopted, and the Lidar is installed on the two-axis tracking frame to form the measurement system. Before the rocket is launched, the Lidar continues to scan the middle and upper part of the rocket to obtain the static laser point cloud data, correct the point cloud data and solve the spatial coordinates, and adopt the multi ellipse center fitting central axis algorithm. It is calculated and analyzed that the static and dynamic attitude measurement accuracy of Lidar are 0.018 8° and 0.049 8° respectively. In the rocket launch test, the Lidar measurement system is arranged at a launch site 150 meters away from the rocket. In the rocket vertical take-off phase, the Lidar tracks and scans the fixed position of the rocket with high precision, and obtains the rocket attitude change value with real-time and high precision.To verify the reliability and rationality of Lidar measurement data, three sets of optical equipment are used to measure the rocket attitude angle intersection at the same time. After comparing the rocket attitude change values measured by Lidar and optical equipment, the following conclusions are drawn: 1) According to the measurement accuracy calculation results and the verification of test data, the attitude measurement accuracy based on Lidar is about 5 times higher than that of optical measurement equipment. 2) Considering the different measurement accuracy of the two equipment, the variation trend of rocket yaw angle and pitch angle measured by Lidar and optical equipment is basically the same in this test, which verifies the correctness and rationality of the attitude measurement methods and measurement accuracy of the two kinds of equipment. 3) The real-time high-precision attitude measurement and data output of the rocket based on Lidar is realized, which effectively fills the gap of a real-time attitude measurement outside the rocket, provides a real-time attitude data source for security control equipment, and ensures the launch safety of the rocket. ? 2022, Science Press. All right reserved.Accession Number: 20221912096733 -
Record 294 of
Title:Long-working-distance 3D measurement with a bionic curved compound-eye camera
Author(s):Liu, Jinheng(1,2); Zhang, Yuanjie(1,2); Xu, Huangrong(1,2); Wu, Dengshan(1,2); Yu, Weixing(1,2)Source: Optics Express Volume: 30 Issue: 20 DOI: 10.1364/OE.473620 Published: September 26, 2022Abstract:The bionic curved compound-eye camera is a bionic-inspired multi-aperture camera, which can be designed to have an overlap on the field of view (FOV) in between adjacent ommatidia so that 3D measurement is possible. In this work, we demonstrate the 3D measurement with a working distance of up to 3.2 m by a curved compound-eye camera. In that there are hundreds of ommatidia in the compound-eye camera, traditional calibration boards with a fixed-pitch pattern arrays are not applicable. A batch calibration method based on the CALTag calibration board for the compound-eye camera was designed. Next, the 3D measurement principle was described and a 3D measurement algorithm for the compound-eye camera was developed. Finally, the 3D measurement experiment on objects placed at different distances and directions from the compound-eye camera was performed. The experimental results show that the working range for 3D measurement can cover the whole FOV of 98° and the working distance can be as long as 3.2 m. Moreover, a complete depth map was reconstructed from a raw image captured by the compound-eye camera and demonstrated as well. The 3D measurement capability of the compound-eye camera at long working distance in a large FOV demonstrated in this work has great potential applications in areas such as unmanned aerial vehicle (UAV) obstacle avoidance and robot navigation. ? 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.Accession Number: 20224112862994 -
Record 295 of
Title:Polarimetric Optical Imaging： Devices， Technologies and Applications （Invited）
Author(s):Ren, Liyong(1,2,3); Liang, Jian(1,2,3); Qu, Enshi(2); Zhang, Wenfei(2,4); Du, Bojun(5); Ma, Feiya(1,3); Guo, Shaoben(1,3); Zhang, Jin(1,3)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 51 Issue: 8 DOI: 10.3788/gzxb20225108.0851505 Published: August 2022Abstract:Polarization is the fourth important "information dimension" parameter in addition to intensity， wavelength and phase to describe the basic properties of electromagnetic waves. The polarization characteristics of reflected or radiated light are closely related to its material， geometry， structure and surface roughness， and physicochemical properties. Polarimetric optical imaging is a novel optical imaging method based on detecting the polarization information of light， which takes advantages of the difference in polarization characteristics between the reflected light and the background stray light to improve the target imaging quality， increase the action distance， enhance the detection capability and the identification probability. As an effective complementary means to the intensity， spectral and infrared imaging methods， polarimetric optical imaging has important applications for target detection in complex background environments with low signal-to-noise ratio， strong scattering and low illumination environments. Based on the authors' years of research work in polarimetric optical imaging and detection， this paper provides a more detailed introduction to the research status of polarimetric optical imaging including the related devices， technologies and applications. We present a comprehensive analysis and introduction of the polarimetric optical imaging technology and camera， the development and the application status at home and abroad. There are mainly two types of the polarimetric optical imaging regimes， which include the division-of time polarimetric optical imaging system and the simultaneous polarimetric optical imaging system， the later one can be further classified into the division-of-amplitude system， the division-of-aperture system， and the division-of-focal-plane system. The Stoke matrix representation of polarized light closely related to polarimetric imaging and the basic imaging principle are briefly introduced. Some research works conducted by our research team in polarimetric camera development and polarimetric optical imaging detection are summarized in detail， involving the design and key devices as well as technologies of the division-of-aperture polarimetric imaging system， the information processing technologies and algorithms and applications of polarization image. To be more specific， we introduce a novel division-of-aperture chromatic polarimetric camera with full-polarization-state simultaneous detection， i.e.， including three linearly polarized states （0°，45°，and 90°） and one right circularly polarized state. We also introduce a division-of-aperture polarimetric lens with full-polarization-state simultaneous detection， which can be easily assembled to a commercial camera to change it into a polarimetric camera. We solve the image registration problem in division-of-aperture polarimetric camera by combining the phase-only correlation algorithm， the Speeded-up Robust Features （SURF） algorithm， and the Random Sample Consensus （RANSAC） algorithm. We propose a novel polarimetric optical imaging regime， namely the division-of-aperture simultaneous system based on the specifically designed color-polarizer filter， which is used for coding both the spectrum and the polarization. We report our research works on the polarimetric dehazing/descattering imaging for fog and/or underwater environments based on the optimization of the Angle of Polarization （AoP）， and the low-pass filter denoising. We also introduce image enhancement algorithms for target imaging， detection and/or identification， where the visible and the near-infrared polarimetric images are fused， or the high-resolution polarized images are reconstructed from the low-resolution polarized images， together with obtaining the high-resolution Degree of Polarization （DoP） image and the high-resolution AoP image. We show the physical model of the polarization 3D reconstruction imaging， together with its basic theory， method and the 3D imaging experimental results. We show some thoughts， suggestions and/or problems on the current techniques and development directions that need to be solved in polarimetric optical imaging research， which include the enhancement of the polarization measurement precision， the optimization design of the polarimetric optical imaging system， the advantages development/extension of the computational optical imaging techniques based on polarimetric image processing and optimization， and the applications of polarimetric optical imaging and detection techniques， etc. ? 2022 Chinese Optical Society. All rights reserved.Accession Number: 20223912795088 -
Record 296 of
Title:Design and Experiment of Push-Broom Hyperspectral Microscopic Imaging System
Author(s):Qi, Meijie(1); Liu, Lixin(1,2); Li, Yanru(1); Liu, Yujie(1); Zhang, Zhoufeng(2); Qu, Junle(3)Source: Zhongguo Jiguang/Chinese Journal of Lasers Volume: 49 Issue: 20 DOI: 10.3788/CJL202249.2007105 Published: October 25, 2022Abstract:Objective Hyperspectral microscopic imaging (HMI) technology combines optical microscopy and hyperspectral imaging to obtain both image and spectral information, thereby revealing spatial distribution and physical and chemical properties of a sample simultaneously. HMI, a novel nondestructive optical imaging technology, can be used to diagnose normal/cancerous tissues with high accuracy, sensitivity, and specificity. However, HMIs have a large amount of data and a complex data structure; thus, systematic and detailed data interpretation is required in cancer diagnosis. In this study, a push-broom HMI system is designed and developed, and the graphical user interface (GUI)-based software for system control, data acquisition, and data analysis is programmed to aid doctors in pathological diagnosis. The classification and staging of skin cancers (basal cell carcinoma, squamous cell carcinoma, and malignant melanoma) are studied on the basis of HMI technology and machine learning algorithms to confirm the performance of the system software. We hope that our HMI system, GUI-based software, and experimental results will be useful in cancer diagnosis and have application potential in biomedicine. Methods First, a push-broom HMI system consists of a halogen lamp, objective lens, sample stage, single-axis motorized translation stage, two-axis manual translation stage, hyperspectral line-scan camera, and other optical devices (Fig. 1). The halogen lamp illuminates the sample on the sample stage. The transmitted light is collected by the objective lens and directed to the hyperspectral camera after passing through the mirror and lens group in sequence to obtain one-dimensional (1D) spatial and spectral information. The motorized translation stage controls the sample stage to move in the x-direction with a step size of 1 μm for HMI data cube acquisition. The spectral resolution of the hyperspectral camera is calibrated and calculated based on the sensor configuration (Fig. 2). HMI system performance parameters, such as spatial resolution, field of view, and magnification, are obtained by imaging a resolution target. Second, the software with graphical user interfaces for system control, data acquisition, and data analysis is programmed using MATLAB. Several machine learning-based data processing methods are provided. Finally, the HMI data cubes of basal cell carcinoma, squamous cell carcinoma, and malignant melanoma tissues are obtained using the HMI system and data acquisition software; subsequently, the classification and staging of skin cancer are studied using data analysis software. Results and Discussions The push-broom HMI system has a spectral range of 465.5-905.1 nm, with a spectral resolution of ~3 nm, field of view of 400.18 μm×192.47 μm, system magnification of 28.15, and actual spatial resolution of 1.10-1.38 μm (Fig.3); it can collect a data cube of 2048 pixel×985 pixel×151. Additionally, GUI-based HMI data acquisition software and analysis software are designed and programmed using MATLAB. The data acquisition software includes the following three modules (Fig. 4): HMI system control and data acquisition module for controlling the hyperspectral camera and motorized translation stage, HMI data acquisition, light source background correction, and frequency domain filtering; HMI data display and processing module for displaying or cropping the HMI data cube and single-band image and calculating the correlation between each band; and save and exit module for saving the data processing results and exiting the acquisition software. The data analysis software consists of the following two modules (Fig. 5): a data extraction and viewing module that can realize HMI image display, spectrum viewing in the region of interest, converting 3D HMI data into 2D spectral data, and synthesizing RGB images with any three single-band images; and an HMI data processing module that can analyze image and spectral data and realize sample classification based on machine learning. HMI data from basal cell carcinoma, squamous cell carcinoma, and malignant melanoma are obtained to evaluate the performance of the system, and the machine learning is used to achieve the classification of three types of skin cancers and staging of squamous cell carcinoma. Spectral distribution, as well as 3D HMI, single-band, and RGB images, can be displayed (Fig. 6). The classification of three types of skin cancers based on image data is achieved using the data analysis software, and the highest classification accuracy of 85% and KAPPA value of 0.77 are obtained using color moment, gray-level co-occurrence matrix and local binary pattern as image features, partial least squares for dimensionality reduction, hold-out method for dividing the dataset, and a support vector machine models for classification. The optimal model for spectral data staging of squamous cell carcinoma corresponding to the standard normal variable transformation for spectral preprocessing, partial least squares for dimensionality reduction, hold-out method for dividing the dataset, and random forest for staging. The highest staging accuracy of 96.4% and a KAPPA value of 0.95 are obtained (Table 1). Conclusions In this study, a push-broom HMI system that can simultaneously obtain image and spectral information is developed to reveal spatial distribution and physicochemical properties of the samples. The HMI system can provide a data cube of 2048 pixel×985 pixel×151, a spectral resolution of ~3 nm, and actual spatial resolution of 1.10-1.38 μm. The HMI data acquisition software and analysis software are programmed using MATLAB. The graphical user interface of the software can standardize experiment procedures, allows intuitive data collection and processing, and provides analysis results, all of which can assist doctors in pathological diagnosis. Using this HMI system to image skin cancer tissues, high spectral and spatial resolution images are obtained, and the classification of different skin cancers and staging of squamous cell carcinomas can be achieved with high accuracy using machine learning algorithms. Our study shows that the combination of HMI technology and machine learning has significant application potential in the field of biomedicine. ? 2022 Science Press. All rights reserved.Accession Number: 20223912808267 -
Record 297 of
Title:Research on a Bragg Rotation Mechanism of X-ray Monochromators with a Nanoradian Resolution
Author(s):Liu, Mengting(1,3); Lei, Weizheng(2); Song, Li(2); Xia, Siyu(4); Feng, Liangjie(4); Dong, Xiaohao(1,2); Wang, Jie(1,2)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 51 Issue: 5 DOI: 10.3788/gzxb20225105.0551317 Published: May 25, 2022Abstract:The new-generation X-ray light sources based on accelerators, Diffraction-limited Storage Rings (DLSRs), and X-ray Free-electron Lasers (XFELs), have excellent properties such as high brightness, high coherence, and high collimation, which has enhanced important opportunities for scientific research and technological development. In the meantime, that brings a lot of challenges on the photon beam manipulation as well, the performance demand of optical components have been greatly improved, and at the same time, the attitude adjustment accuracy of optical components has generally entered the "micro/nano" range, such as the resolution of linear motion and angular rotation of optical components are supposed to reach a level of sub-nanometre and nanoradian. In the construction of the beamline, the monochromator is one of the core equipment to guarantee the optical performance of the beamline. In order to meet requirements of high stability and motion precision of beamline optics, for crystal monochromators in the new-generation light sources, a mechanism with a nano-radian angular resolution, driven by piezoelectric nano-displacement stages was developed. An optimized slider-crank mechanism is adopted for a large angle range of tens of degrees, so that a broader energy range can be covered with relatively big Bragg diffraction angles. This paper presents the main design parameters of the offset slider-crank mechanism for crystal monochromators according to the demand of energy range, the energy resolution and the required linear transmission ratio of X-ray crystal monochromator. By establishing a geometrical model of the slider-crank mechanism, it turns out that the transmission ratio between the linear displacement and the Sine of the Bragg angle depends solely on the crank rod length. Therefore, the length of crank rod can be determined according to the transmission ratio. At the same time, an optimized model of the offset slider-crank mechanism parameters is established in this paper, and the length of the connecting rod was determined according to achieving a high-precision linear transmission ratio in a large angle range. Finally, the precise angular displacement monitoring was carried out using a high-precision non-contact Fabry-Perot laser interferometer. The measurement errors of the high-precision angle measurement method are analyzed and it is found that the measurement errors can be ignored in the extremely small measurement range within an incremental step. The final results show that an angular resolution of 31.2 nrad can be achieved with a good linear relation of transmission, and the angular stability is better than 16 nrad within 800 seconds. The design of this mechanism has a great convenience for crystal'S adjustment of X-Ray monochromators, and it is conducive to techniques studies on an angular stability of nanoradians. ? 2022, Science Press. All right reserved.Accession Number: 20222412233237 -
Record 298 of
Title:A large-format streak tube for compressed ultrafast photography
Author(s):Li, Hang(1,2,3); Xue, Yanhua(1,3); Tian, Jinshou(1,3); Li, Shaohui(1,3); Wang, Junfeng(1,3); Chen, Ping(1,3); Tian, Liping(1,3,4); He, Jianping(1,3); Zhang, Minrui(1,3); Liu, Baiyu(1,3); Gou, Yongsheng(1,3); Xu, Xiangyan(1,3); Li, Yahui(1,3); Xin, Liwei(1,3)Source: Review of Scientific Instruments Volume: 93 Issue: 11 DOI: 10.1063/5.0105441 Published: November 1, 2022Abstract:Streak cameras are powerful imaging instruments for studying ultrafast dynamics with the temporal resolution ranging from picosecond to attosecond. However, the confined detection area limits the information capacity of streak cameras, preventing them from fulfilling their potential in lidar, compressed ultrafast photography, etc. Here, we designed and manufactured a large-format streak tube with a large-size round-aperture gate, a spherical cathode, and a spherical screen, leading to an expanded detection area and a high spatial resolution. The simulation results show that the physical temporal resolution of the streak tube is better than 45 ps and the spatial resolutions are higher than 14 lp/mm in the whole area of 24 × 28 mm2 on the cathode. The experiments demonstrate the streak tube's application potential in weak light imaging benefiting from the imaging magnification of 0.79, a photocathode radiance sensitivity of 37 mA/W, a radiant emitting gain of 11.6 at the wavelength of 500 nm, and a dynamic range higher than 512:1. Most importantly, in the photocathode area of φ35 mm, the static spatial resolutions at the center and the edge along the slit (R = 16 mm) reach 32 and 28 lp/mm, respectively, and are higher than 10 lp/mm in the whole area of 24 × 28 mm2 on the cathode, allowing for a considerable capacity for spatial information. ? 2022 Author(s).Accession Number: 20224913219872 -
Record 299 of
Title:A 224-Gb/s Inverter-Based TIA with Interleaved Active-Feedback and Distributed Peaking in 28-nm CMOS for Silicon Photonic Receivers
Author(s):Chen, Sikai(1,2); Xue, Jintao(4,5); Li, Leliang(2,3); Li, Guike(2,3); Zhang, Zhao(2,3); Liu, Jian(2,3); Liu, Liyuan(2,3); Wang, Binhao(4,5); Li, Yingtao(1); Qi, Nan(2,3)Source: Proceedings of 2022 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2022 Volume: Issue: DOI: 10.1109/ICTA56932.2022.9963090 Published: 2022Abstract:This paper presents the design and simulations of a 224-Gb/s inverter-based transimpedance amplifier (TIA) designed in 28-nm CMOS process. The co-design of the photodiode and CMOS TIA efficiently optimize the optical receiver. The TIA achieves the bandwidth enhancement with the distributed peaking and interleaved active-feedback (IAFB) technology. The simulations result show that the proposed TIA has 39-dBΩ transimpedance gain and 70-GHz bandwidth (BW). Overall, it achieves a clear 224-Gb/s PAM4 eye diagram. The total power consumption is 20.7mW at 0.9-V supply voltage. And the input referred noise current is 8.2uArms. ? 2022 IEEE.Accession Number: 20225113261003 -
Record 300 of
Title:Exact optical path difference and complete performance analysis of a spectral zooming imaging spectrometer
Author(s):Zhang, Xiangzhe(1); Huang, Liqing(2); Zhu, Jingping(1); Zhang, Ning(3); Zong, Kang(1); Zhai, Lipeng(2); Zhang, Yu(2); Cai, Yakun(4); Wang, Huimin(2)Source: Optics Express Volume: 30 Issue: 22 DOI: 10.1364/OE.468584 Published: October 24, 2022Abstract:The optical path difference (OPD) equations of the dual Wollaston prisms (DWP) with an adjustable air gap (AG) are derived by the wave normal tracing method, which is suitable for arbitrary incidence plane and angle. The spatial distribution of the OPD for various AG is presented. The validity of the OPD equation is verified by comparing the calculated interferograms with experimentally observed one. The performance of a novel static birefringent Fourier transform imaging spectrometer (SBFTIS) based on the DWP is investigated. The spectral resolution can be adjusted by changing the AG and the field of view can reach 10.0°, which is much larger than that predicted by our previous work. The results obtained in this article provide a theoretical basis for completely describing the optical transmission characteristic of the DWP and developing the high-performance birefringent spectral zooming imaging spectrometer. ? 2022 Optica Publishing Group.Accession Number: 20224713150657