Pub Date : 2024-08-09DOI: 10.1109/JPHOT.2024.3441245
Vinit Singh Yadav;Amalendu Patnaik
A graphene–based multifunctional polarization converter for the mid–THz band is proposed in this work and its electromagnetic behavior is explained with the help of the physics behind it and the circuital theory. The novelty of the proposed reflector lies in the fact that a linear–to–linear (LL) polarization conversion takes place for a chemical potential in 0.3–0.6 eV and a linear–to–circular (LC) in 0.7–1.0 eV across the mono–layered graphene over a large oblique angle ( $approx$ 40 $^{circ }$ ) of the incident wave. The fractional 3 dB axial ratio bandwidth in the case of LC polarization conversion is 81%. Moreover, for LL polarization conversion it gives 31% fractional bandwidth for polarization conversion ratio (PCR) more than 85%. The structure maintains a thickness of $lambda$ /7.5 and a lattice size of $lambda$ /18. The proposed multi–functional polarization converter can act as a promising candidate for THz indoor communication.
本文提出了一种基于石墨烯的中 THz 波段多功能极化转换器，并借助其背后的物理学和电路理论解释了其电磁行为。所提出的反射器的新颖之处在于，在化学势为 0.3-0.6 eV 和 0.7-1.0 eV 的情况下，在入射波的大斜角（$approx$ 40$^{circ }$）上，穿过单层石墨烯的线性到线性（LL）极化转换和线性到圆形（LC）极化转换都会发生。LC 偏振转换情况下的分数 3 dB 轴向比带宽为 81%。此外，对于 LL 偏振转换，它能提供 31% 的分数带宽，使偏振转换率（PCR）超过 85%。该结构的厚度为$lambda$/7.5，晶格尺寸为$lambda$/18。所提出的多功能偏振转换器可作为太赫兹室内通信的理想候选器件。
{"title":"A Broadband Graphene Based Multi-Functional mid-THz Polarization Converter","authors":"Vinit Singh Yadav;Amalendu Patnaik","doi":"10.1109/JPHOT.2024.3441245","DOIUrl":"10.1109/JPHOT.2024.3441245","url":null,"abstract":"A graphene–based multifunctional polarization converter for the mid–THz band is proposed in this work and its electromagnetic behavior is explained with the help of the physics behind it and the circuital theory. The novelty of the proposed reflector lies in the fact that a linear–to–linear (LL) polarization conversion takes place for a chemical potential in 0.3–0.6 eV and a linear–to–circular (LC) in 0.7–1.0 eV across the mono–layered graphene over a large oblique angle (\u0000<inline-formula><tex-math>$approx$</tex-math></inline-formula>\u0000 40\u0000<inline-formula><tex-math>$^{circ }$</tex-math></inline-formula>\u0000) of the incident wave. The fractional 3 dB axial ratio bandwidth in the case of LC polarization conversion is 81%. Moreover, for LL polarization conversion it gives 31% fractional bandwidth for polarization conversion ratio (PCR) more than 85%. The structure maintains a thickness of \u0000<inline-formula><tex-math>$lambda$</tex-math></inline-formula>\u0000/7.5 and a lattice size of \u0000<inline-formula><tex-math>$lambda$</tex-math></inline-formula>\u0000/18. The proposed multi–functional polarization converter can act as a promising candidate for THz indoor communication.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 5","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10632621","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934210","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}
Pub Date : 2024-08-07DOI: 10.1109/JPHOT.2024.3439886
Di Wu;Jing Zhang
In this paper, a novel refractive index (RI) sensor based on the soliton self-frequency shift (SSFS) in tellurite photonic crystal fiber (TPCF) is proposed. RI sensing in the mid-infrared region is achieved by detecting the wavelength shift of the soliton. By exploiting the high RI property of the tellurite fiber, it is possible to measure surrogate liquids with higher RIs compared to conventional silica fibers. The sensitivity of the proposed sensor can reach up to 3657.5 nm/RIU when a fiber laser with a pulse width of 100 fs and pump wavelength ( λP ) of 2600 nm is used as the light source and a 1 m-long TPCF is utilized as the nonlinear medium. To the best of our knowledge, this is the first time that high RI sensing in the mid infrared region has been achieved by exploiting the SSFS effect in non-silica fibers such as TPCF.
本文提出了一种基于碲镉汞光子晶体光纤（TPCF）中孤子自频移（SSFS）的新型折射率（RI）传感器。中红外区域的折射率传感是通过检测孤子的波长偏移实现的。通过利用碲化镉光纤的高 RI 特性，可以测量与传统硅光纤相比 RI 更高的代用液体。当使用脉冲宽度为 100 fs、泵浦波长 (λP) 为 2600 nm 的光纤激光器作为光源，并使用 1 m 长的 TPCF 作为非线性介质时，所提出传感器的灵敏度可达 3657.5 nm/RIU。据我们所知，这是首次在 TPCF 等非硅光纤中利用 SSFS 效应实现中红外区域的高 RI 传感。
{"title":"High Refractive Index Sensor for Tellurite Photonic Crystal Fiber Based on Soliton Self-Frequency Shift","authors":"Di Wu;Jing Zhang","doi":"10.1109/JPHOT.2024.3439886","DOIUrl":"10.1109/JPHOT.2024.3439886","url":null,"abstract":"In this paper, a novel refractive index (RI) sensor based on the soliton self-frequency shift (SSFS) in tellurite photonic crystal fiber (TPCF) is proposed. RI sensing in the mid-infrared region is achieved by detecting the wavelength shift of the soliton. By exploiting the high RI property of the tellurite fiber, it is possible to measure surrogate liquids with higher RIs compared to conventional silica fibers. The sensitivity of the proposed sensor can reach up to 3657.5 nm/RIU when a fiber laser with a pulse width of 100 fs and pump wavelength (\u0000<italic>λ<sub>P</sub></i>\u0000) of 2600 nm is used as the light source and a 1 m-long TPCF is utilized as the nonlinear medium. To the best of our knowledge, this is the first time that high RI sensing in the mid infrared region has been achieved by exploiting the SSFS effect in non-silica fibers such as TPCF.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 5","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10629046","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934209","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}
In recent years, the rapid development of integrated optics provides a novel approach to realize miniaturized and lightweight fiber optic gyroscope (FOG). This paper proposes a TE-pass polarizer based on the silicon nitride on insulator (SNOI) platform operating at 850 nm, whose insertion loss is lower than 1.02 dB with the polarization extinction ratio (PER) larger than 47 dB. The proposed polarizer could directly edge-couple to the thin film lithium niobate (TFLN) modulator with a negligible loss (<0.19 dB) to form a combined hybrid modulator, which integrates the function of modulating, splitting, and polarizing. Compared with the traditional bulk lithium niobate modulator, the utilization of the hybrid modulator in FOGs could increase the optical power entering the fiber coil by 68% at 850 nm, which greatly facilitates the improvement of FOG precision. Furthermore, the undesired residual intensity modulation effect in the bulk lithium niobate modulator is also theoretically avoided by employing the hybrid modulator.
近年来，集成光学技术的快速发展为实现光纤陀螺仪（FOG）的小型化和轻量化提供了一种新方法。本文提出了一种基于绝缘体氮化硅（SNOI）平台的 TE 通偏振器，其工作波长为 850 nm，插入损耗低于 1.02 dB，偏振消光比（PER）大于 47 dB。所提出的偏振器可直接与铌酸锂薄膜（TFLN）调制器进行边缘耦合，其损耗可忽略不计（小于 0.19 dB），从而形成一个集调制、分裂和偏振功能于一体的组合式混合调制器。与传统的块状铌酸锂调制器相比，在 FOG 中使用该混合调制器可使进入光纤线圈的光功率在 850 nm 波长处增加 68%，从而大大提高了 FOG 的精度。此外，采用混合调制器还能从理论上避免块状铌酸锂调制器中不希望出现的残余强度调制效应。
{"title":"Design of Silicon Nitride Based TE-Pass Polarizer at 850 nm for Integrated Fiber Optic Gyroscope","authors":"Zhiyu Guo;Ningfang Song;Linghai Kong;Jing Jin;Zuchen Zhang","doi":"10.1109/JPHOT.2024.3439349","DOIUrl":"10.1109/JPHOT.2024.3439349","url":null,"abstract":"In recent years, the rapid development of integrated optics provides a novel approach to realize miniaturized and lightweight fiber optic gyroscope (FOG). This paper proposes a TE-pass polarizer based on the silicon nitride on insulator (SNOI) platform operating at 850 nm, whose insertion loss is lower than 1.02 dB with the polarization extinction ratio (PER) larger than 47 dB. The proposed polarizer could directly edge-couple to the thin film lithium niobate (TFLN) modulator with a negligible loss (<0.19 dB) to form a combined hybrid modulator, which integrates the function of modulating, splitting, and polarizing. Compared with the traditional bulk lithium niobate modulator, the utilization of the hybrid modulator in FOGs could increase the optical power entering the fiber coil by 68% at 850 nm, which greatly facilitates the improvement of FOG precision. Furthermore, the undesired residual intensity modulation effect in the bulk lithium niobate modulator is also theoretically avoided by employing the hybrid modulator.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 5","pages":"1-10"},"PeriodicalIF":2.1,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10623802","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934232","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}
Pub Date : 2024-08-06DOI: 10.1109/JPHOT.2024.3438839
Fujun Xu;Xiaxiao Wang;Xiaobin Xu;Ningfang Song
We demonstrate a tunable single-longitudinal-mode (SLM) narrow linewidth erbium-doped fiber (EDF) ring laser (EDFRL) in a cost-effective way. The laser incorporates an unpumped-EDF-based saturable absorber (SA) and a self-injection feedback loop for mode selection. The EDFDRL exhibits linear tunability of 12.57 pm/ $^{circ }$ C from 15 $^{circ }$ C to 45 $^{circ }$ C with a maximum tuning range of 0.3664 nm. At a pump current of 200 mA, we achieve a SLM EDFRL characterized by a high OSNR of 75 dB and an ultra-narrow linewidth of 330 Hz. Furthermore, it shows an excellent wavelength stability, with a maximum fluctuation of only 11.23 pm.
{"title":"Tunable Narrow Linewidth Erbium-Doped Fiber Ring Laser Based on Saturable Absorber and Self-Injection Feedback","authors":"Fujun Xu;Xiaxiao Wang;Xiaobin Xu;Ningfang Song","doi":"10.1109/JPHOT.2024.3438839","DOIUrl":"10.1109/JPHOT.2024.3438839","url":null,"abstract":"We demonstrate a tunable single-longitudinal-mode (SLM) narrow linewidth erbium-doped fiber (EDF) ring laser (EDFRL) in a cost-effective way. The laser incorporates an unpumped-EDF-based saturable absorber (SA) and a self-injection feedback loop for mode selection. The EDFDRL exhibits linear tunability of 12.57 pm/\u0000<inline-formula><tex-math>$^{circ }$</tex-math></inline-formula>\u0000C from 15 \u0000<inline-formula><tex-math>$^{circ }$</tex-math></inline-formula>\u0000C to 45 \u0000<inline-formula><tex-math>$^{circ }$</tex-math></inline-formula>\u0000C with a maximum tuning range of 0.3664 nm. At a pump current of 200 mA, we achieve a SLM EDFRL characterized by a high OSNR of 75 dB and an ultra-narrow linewidth of 330 Hz. Furthermore, it shows an excellent wavelength stability, with a maximum fluctuation of only 11.23 pm.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 5","pages":"1-5"},"PeriodicalIF":2.1,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10623881","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934211","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}
Pub Date : 2024-08-05DOI: 10.1109/JPHOT.2024.3438237
Yi Zhang;Feiyang Gu;Haokai Wang;Qingyu Yang;Yubo Wang;Xingyu Li;Youwei Tian
This paper focuses on the scenario where relativistic electron nonlinear Thomson forward scattering is driven by circularly polarized laser pulses, using both theoretical analysis and numerical simulations. For the first time, we investigate how the magnetic flux density and beam waist radius jointly influence the spatiotemporal properties of radiation. For the superimposed field under different parameters, the forces exerted by the laser field and the applied magnetic field on electrons will show cooperative or competitive relationships at different moments of action. And the transformation of this relationship promotes the evolution of the electron radiation pattern in the superimposed field, which greatly changes the spatiotemporal properties of Thomson scattering. Based on this, completely new spatial distributions of radiation-ripple and lotus phenomena were discovered. In addition, the combination of parameters with the best radiation properties was selected through Big Data, and the quasi-periodicity of the azimuth angle ${{phi }_{bm{p}}}$ was discovered for the first time. These results will contribute to the understanding of the radiation mechanism of Thomson scattering in superimposed field and will be instructive for laboratory modulation of ultra-high-performance ${bm{X}}/{bm{gamma }}$ -rays.
{"title":"Ripple and Lotus Phenomenon: Radiation Pattern Evolution of Nonlinear Thomson Scattering Under Cooperative and Competitive Effects of Applied Magnetic and Laser Field","authors":"Yi Zhang;Feiyang Gu;Haokai Wang;Qingyu Yang;Yubo Wang;Xingyu Li;Youwei Tian","doi":"10.1109/JPHOT.2024.3438237","DOIUrl":"10.1109/JPHOT.2024.3438237","url":null,"abstract":"This paper focuses on the scenario where relativistic electron nonlinear Thomson forward scattering is driven by circularly polarized laser pulses, using both theoretical analysis and numerical simulations. For the first time, we investigate how the magnetic flux density and beam waist radius jointly influence the spatiotemporal properties of radiation. For the superimposed field under different parameters, the forces exerted by the laser field and the applied magnetic field on electrons will show cooperative or competitive relationships at different moments of action. And the transformation of this relationship promotes the evolution of the electron radiation pattern in the superimposed field, which greatly changes the spatiotemporal properties of Thomson scattering. Based on this, completely new spatial distributions of radiation-ripple and lotus phenomena were discovered. In addition, the combination of parameters with the best radiation properties was selected through Big Data, and the quasi-periodicity of the azimuth angle \u0000<inline-formula><tex-math>${{phi }_{bm{p}}}$</tex-math></inline-formula>\u0000 was discovered for the first time. These results will contribute to the understanding of the radiation mechanism of Thomson scattering in superimposed field and will be instructive for laboratory modulation of ultra-high-performance \u0000<inline-formula><tex-math>${bm{X}}/{bm{gamma }}$</tex-math></inline-formula>\u0000-rays.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 5","pages":"1-12"},"PeriodicalIF":2.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10623228","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934233","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}
The concept of human-centric lighting is gradually emerging. People no longer only consider the lighting function of light, but also begin to pay attention to the comfort and health of light. In this article, we perform an investigation on the circadian regulation of four-primary light-emitting diode (LED) based displays for the people with various ages from 1 year old to 100 years old. The double-Gaussian function is used to mimic the spectral power distribution of monochromatic LED. The main figures of merit of LED display performance are color gamut of Rec. 2020, luminous efficacy of radiation, correlated color temperature (CCT), and also non-visual parameters, such as circadian stimulus and melanopic efficacy of luminous radiation provided by Commission Internationale de l'Eclairage (CIE) standard. Then, the genetic algorithm is adopted for performing the spectral optimization of four-primary LED display while many constraint conditions are set, such as CCT values (2700 K and 6500 K), CCT tolerance, and color distance ( D uv < 0.01) in the CIE 1960 UCS color space. Related results of visual and non-visual characteristics are also compared with those of three-primary LED displays. This work would pave a way for the development of healthy four-primary LED display in consideration of various ages of people.
以人为本的照明理念逐渐兴起。人们不再仅仅考虑光的照明功能，也开始关注光的舒适性和健康性。在本文中，我们研究了基于四基色发光二极管（LED）的显示屏对从 1 岁到 100 岁不同年龄段人群的昼夜节律调节。本文使用双高斯函数来模拟单色 LED 的光谱功率分布。LED 显示屏性能的主要参数包括 Rec.2020 色域、辐射光效、相关色温（CCT），以及非视觉参数，如昼夜节律刺激和国际照明委员会（CIE）标准规定的光辐射黑色素效应。然后，在 CIE 1960 UCS 色彩空间中设置了许多约束条件，如 CCT 值（2700 K 和 6500 K）、CCT 容差和色距（Duv < 0.01），并采用遗传算法对四基色 LED 显示屏进行光谱优化。视觉和非视觉特性的相关结果也与三原色 LED 显示屏的结果进行了比较。这项工作将为针对不同年龄段人群开发健康的四基色 LED 显示屏铺平道路。
{"title":"Investigation on Circadian Regulation of Four-Primary LED Display Differed in People by GA","authors":"Wenhui Li;Junying Li;Yating Feng;Yi Lin;Haoyang Liu;Ruoping Lian;Qinzhen Lin;Jingyi Cui;Zixin Huang;Yaling Chai;Ziquan Guo;Lili Zheng;Zhong Chen","doi":"10.1109/JPHOT.2024.3436540","DOIUrl":"10.1109/JPHOT.2024.3436540","url":null,"abstract":"The concept of human-centric lighting is gradually emerging. People no longer only consider the lighting function of light, but also begin to pay attention to the comfort and health of light. In this article, we perform an investigation on the circadian regulation of four-primary light-emitting diode (LED) based displays for the people with various ages from 1 year old to 100 years old. The double-Gaussian function is used to mimic the spectral power distribution of monochromatic LED. The main figures of merit of LED display performance are color gamut of Rec. 2020, luminous efficacy of radiation, correlated color temperature (CCT), and also non-visual parameters, such as circadian stimulus and melanopic efficacy of luminous radiation provided by Commission Internationale de l'Eclairage (CIE) standard. Then, the genetic algorithm is adopted for performing the spectral optimization of four-primary LED display while many constraint conditions are set, such as CCT values (2700 K and 6500 K), CCT tolerance, and color distance (\u0000<italic>D</i>\u0000<sub>uv</sub>\u0000 < 0.01) in the CIE 1960 UCS color space. Related results of visual and non-visual characteristics are also compared with those of three-primary LED displays. This work would pave a way for the development of healthy four-primary LED display in consideration of various ages of people.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 5","pages":"1-5"},"PeriodicalIF":2.1,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10620601","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881328","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}
Pub Date : 2024-08-02DOI: 10.1109/jphot.2024.3437252
Han Zhou, Jilin Zheng, Tao Pu, Jiaqi Zhao, Jin Li, Yukai Chen, Mengqi Zhao, Hua Zhou, Han Xue, Yang Liu
{"title":"Frequency-hopping optical stealth communication system based on supercontinuum spectrum laser source","authors":"Han Zhou, Jilin Zheng, Tao Pu, Jiaqi Zhao, Jin Li, Yukai Chen, Mengqi Zhao, Hua Zhou, Han Xue, Yang Liu","doi":"10.1109/jphot.2024.3437252","DOIUrl":"https://doi.org/10.1109/jphot.2024.3437252","url":null,"abstract":"","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"79 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-30DOI: 10.1109/JPHOT.2024.3435832
Hongmin Qi;Jun Xiong;Meichen Cao;Weien Lai;Yaohui Hu
For the purpose of meeting the requirements of wrist-worn wearable devices for human-computer interaction and for measuring human physiological parameters, especially dynamic physiological parameters, the collaborative work of various sensors is essential to provide sufficient perceptual information. This study introduces a Wrist Information Detection Sensor Based on Pinhole Imaging (WIDSP). This sensor utilizes the principle of pinhole imaging, employing an image sensor to capture motion and physiological signals at the wrist. Through the processing and analysis of image data, it can achieve the recognition of hand movements and the measurement of human physiological parameters. In the evaluation experiments, the displacement compensation function of WIDSP enhanced the recognition rate of mouse-like movements from 94.67% to 97.33%. Additionally, this sensor achieved a heart rate measurement with less than 2% error, demonstrating WIDSP's broad prospects in wrist information perception applications.
{"title":"Wrist Information Detection Sensor Based on Pinhole Imaging","authors":"Hongmin Qi;Jun Xiong;Meichen Cao;Weien Lai;Yaohui Hu","doi":"10.1109/JPHOT.2024.3435832","DOIUrl":"10.1109/JPHOT.2024.3435832","url":null,"abstract":"For the purpose of meeting the requirements of wrist-worn wearable devices for human-computer interaction and for measuring human physiological parameters, especially dynamic physiological parameters, the collaborative work of various sensors is essential to provide sufficient perceptual information. This study introduces a Wrist Information Detection Sensor Based on Pinhole Imaging (WIDSP). This sensor utilizes the principle of pinhole imaging, employing an image sensor to capture motion and physiological signals at the wrist. Through the processing and analysis of image data, it can achieve the recognition of hand movements and the measurement of human physiological parameters. In the evaluation experiments, the displacement compensation function of WIDSP enhanced the recognition rate of mouse-like movements from 94.67% to 97.33%. Additionally, this sensor achieved a heart rate measurement with less than 2% error, demonstrating WIDSP's broad prospects in wrist information perception applications.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10614802","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870613","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}
A photonic method for the reconfigurable generation of switchable multi-format linearly frequency modulated (LFM) signal using a dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM) is proposed and experimentally verified. By properly controlling the bias voltage applied on the DP-DPMZM, different chirp waveforms, including dual-chirped, down-chirped and up-chirped LFM signals, can be obtained when a radio frequency (RF) signal and a baseband chirped signal are injected into the modulator. Besides, the central frequency of the generated LFM signal can be converted from X-band to K-band by adopting -2 nd -order sideband instead of -1 st -order sideband of the modulated RF signal. Moreover, the RF signal is always single sideband modulated, thus eliminating the dispersion-induced power fading, which is essential for the photonics-based distributed multi-function radar. In the proposed scheme, no optical filter is required, which also improves the stability and feasibility of the system.
本文提出并通过实验验证了一种利用双偏振双并联马赫-泽恩德调制器（DP-DPMZM）可重新配置生成可切换多格式线性频率调制（LFM）信号的光子方法。通过适当控制施加在 DP-DPMZM 上的偏置电压，当射频（RF）信号和基带啁啾信号注入调制器时，可获得不同的啁啾波形，包括双啁啾、下啁啾和上啁啾 LFM 信号。此外，生成的低频调制信号的中心频率可从 X 波段转换为 K 波段，方法是采用-2 阶边带代替调制射频信号的-1 阶边带。此外，射频信号始终为单边带调制，从而消除了色散引起的功率衰减，这对于基于光子技术的分布式多功能雷达来说至关重要。在所提出的方案中，不需要光滤波器，这也提高了系统的稳定性和可行性。
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Pub Date : 2024-07-29DOI: 10.1109/JPHOT.2024.3434972
Chen Huang;Qiurong Yan;Jinwei Yan;Yi Li;Xiaolong Luo;Hui Wang
Reconstructing high-quality images with few measurements has always been a primary goal for single-pixel imaging (SPI). Diffusion models have shown outstanding performance in image generation and have been effectively attempted in image reconstruction for ghost imaging. However, there is still a great deal of space for improvement in the quality of image reconstruction at low sampling rates. Inspired by the proximal gradient descent algorithm (PGD), we propose Diffusion Model with Gradient Descent Module Guiding Reconstruction for Single-Pixel Imaging. The gradient descent module in PGD is utilized for preliminary image reconstruction. The preliminary reconstruction serves as prior information to iteratively constrain the diffusion model, allowing it to generate target images consistent with the training data distribution. Additionally, the strong mapping ability of the diffusion model replaces the traditional proximal operator to accelerate convergence. Full connected sampling and convolutional sampling are proposed as alternative sampling methods to the traditional Gaussian random matrix sampling. Sampling and generation are optimized jointly to capture key image information and improve reconstruction accuracy. Simulations and experiments confirm that our proposed network can significantly improve the quality of image reconstruction at low measurement rates.
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