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Performance Enhancement of FEC-Coded 32QAM DMT Signals With Rate-Flexible HCS in FSO Systems 在 FSO 系统中利用速率灵活的 HCS 提高 FEC 编码 32QAM DMT 信号的性能
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-31 DOI: 10.1109/LPT.2024.3434993
Xiaoyu Liu;Weiying Yang;Zhiyang Liu;Shilin Xiao
{"title":"Performance Enhancement of FEC-Coded 32QAM DMT Signals With Rate-Flexible HCS in FSO Systems","authors":"Xiaoyu Liu;Weiying Yang;Zhiyang Liu;Shilin Xiao","doi":"10.1109/LPT.2024.3434993","DOIUrl":"10.1109/LPT.2024.3434993","url":null,"abstract":"A rate-flexible hybrid constellation shaping (HCS) is proposed and demonstrated in polar-coded discrete multi-tone (DMT) free-space optical (FSO) communications. This joint design considers the constraints of geometry and probabilities in coded modulations to maximize the channel capacity and flexibly adjusts the parameters according to the data rates. Compared to the regular scheme over free-space links, the capacity of the proposed scheme at different data rates is improved by about 0.25 bits/ symbol when the launch power is -6dBm. And the power budgets of our approach with polar codes are saved more than 1.0 dB at the bit error rate of \u0000<inline-formula> <tex-math>${10}^{-4}$ </tex-math></inline-formula>\u0000. Even in weak turbulence conditions, the Q2 factor of the proposed maintains the maximum and is improved by \u0000<inline-formula> <tex-math>$1.84sim 3.40$ </tex-math></inline-formula>\u0000dB than the regular scheme, indicating its better ability to combat turbulence.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Two-Component Gas Sensor of Time-Division Multiplexing Technique Based on QEPAS and LITES 基于 QEPAS 和 LITES 的时分复用技术的双组分气体传感器
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-30 DOI: 10.1109/LPT.2024.3435733
Lu Qin;Shaoqiang Bi;Ran Chen;Yiyang Zhao;Jingqi Shi;Hengbiao Zhang;Zongliang Wang
{"title":"Two-Component Gas Sensor of Time-Division Multiplexing Technique Based on QEPAS and LITES","authors":"Lu Qin;Shaoqiang Bi;Ran Chen;Yiyang Zhao;Jingqi Shi;Hengbiao Zhang;Zongliang Wang","doi":"10.1109/LPT.2024.3435733","DOIUrl":"10.1109/LPT.2024.3435733","url":null,"abstract":"A two-component gas sensor based on Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) and Light-Induced Thermoelastic Spectroscopy (LITES) was realized by the time-division multiplexing technique. Two off-beam acoustic microresonator (AMRs) were used in the experiment for twice excitation and enhancement of QEPAS signal. The four fiber collimators were connected with the two off-beam AMRs to be responsible for laser propagation in the two AMRs. After passing through the second AMR, the laser beam was incident to the sidewall of the quartz tuning fork (QTF) by the fiber collimator 5 for the excitation of the LITES signal, which realized the superposition of QEPAS signals and LITES signal on a single QTF. The time-division operation of distributed feedback lasers was realized by optical switches to accomplish the detection of C2H2 and CH4. The experimental results showed that the minimum detection limits of C2H2 and CH4 were 2.06 ppmv and 7.14 ppmv, respectively, which proved that the gas sensor had good sensing performance.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bi-Functional Meta-Surfaces for Ultra-Wideband Absorption and Broadband Polarization Conversion 用于超宽带吸收和宽带极化转换的双功能元表面
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-29 DOI: 10.1109/LPT.2024.3434950
Guotai Liu;Rui Yang;Cheng Zhu;Zenghu Fan
{"title":"Bi-Functional Meta-Surfaces for Ultra-Wideband Absorption and Broadband Polarization Conversion","authors":"Guotai Liu;Rui Yang;Cheng Zhu;Zenghu Fan","doi":"10.1109/LPT.2024.3434950","DOIUrl":"10.1109/LPT.2024.3434950","url":null,"abstract":"We demonstrate the dynamically switching of the ultra-wideband absorption and the broadband polarization conversion through a bi-functional hybrid meta-surface design consisting of periodic stacked vanadium-dioxide (VO2) rings coated with graphene resonators. More specifically, such a hybrid graphene VO2 meta-surface is capable of trapping electromagnetic fields with more than 95% absorption rate from 1.43 to 8.96 THz when we impose 0 eV Fermi energy level over the graphene array with conducting-state VO2. On the other hand, highly efficient linear-to-circular polarization conversion with greater than 0.95 ellipticity can be achieved from 1.24 to 3.57 THz when the graphene Fermi energy level is set as 1 eV with insulating-state VO2. The design scheme using hybrid meta-surfaces with contemporary tunable materials to achieve ultra-wide band reconfigurable multi-functionalities, should pave the way for more advanced manipulations of electromagnetic fields.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-Performance Thin-Film Lithium Niobate Mach–Zehnder Modulator on 8-inch Silicon Substrates 8 英寸硅衬底上的高性能薄膜铌酸锂马赫-泽恩德调制器
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-29 DOI: 10.1109/LPT.2024.3434542
Jingjie Zhou;Liming Lv;Zhanshi Yao;Shiyang Zhu;Yuxi Wang;Qingyu Cong;Zhaoyi Li;Zuowen Fan;Xianfeng Zeng;Ting Hu;Lianxi Jia
{"title":"High-Performance Thin-Film Lithium Niobate Mach–Zehnder Modulator on 8-inch Silicon Substrates","authors":"Jingjie Zhou;Liming Lv;Zhanshi Yao;Shiyang Zhu;Yuxi Wang;Qingyu Cong;Zhaoyi Li;Zuowen Fan;Xianfeng Zeng;Ting Hu;Lianxi Jia","doi":"10.1109/LPT.2024.3434542","DOIUrl":"10.1109/LPT.2024.3434542","url":null,"abstract":"Lithium niobate modulators have primarily been fabricated on chip-level or 4/6-inch wafers. Here, thin-film lithium niobate (TFLN) electro-optic Mach-Zehnder modulators (MZM) are demonstrated for the first time on an 8-inch silicon substrate. The fabricated LN modulator has an on-chip loss of less than 1 dB with a waveguide loss of lower than 0.5 dB/cm. The half-wave voltage- length product (V\u0000<inline-formula> <tex-math>$pi cdot $ </tex-math></inline-formula>\u0000 L) is 3.12 V\u0000<inline-formula> <tex-math>$cdot $ </tex-math></inline-formula>\u0000 cm in the C-band at a 0.5 cm modulation length, and the corresponding 3-dB bandwidth of the electro-optic response is beyond 67 GHz. All specifications are state-of-the-art. These results provide the basis for the industrialization of the TFLN platform with better balance between performance and cost.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced High-Resolution Compact Microscopy Based on the Fiber Optic Array and Microsphere 基于光纤阵列和微球的增强型高分辨率紧凑显微镜
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-29 DOI: 10.1109/LPT.2024.3435538
Xinjie Zhang;Jibin Wei;Jing Sun;Zengrun Wen;Yangjian Cai;Weiming Wang
{"title":"Enhanced High-Resolution Compact Microscopy Based on the Fiber Optic Array and Microsphere","authors":"Xinjie Zhang;Jibin Wei;Jing Sun;Zengrun Wen;Yangjian Cai;Weiming Wang","doi":"10.1109/LPT.2024.3435538","DOIUrl":"10.1109/LPT.2024.3435538","url":null,"abstract":"High resolution is important properties of the compact microscopy in the point-of-care testing (POCT) and management of various infectious diseases. However, the current high-resolution compact microscopy usually has complicated algorithm at the expense of real-time. This letter experimentally demonstrated a method to improve the resolution of compact microscope by employing the microsphere, in combination with the tube lens placed on the small-end of the fiber optic array (FOA) which termed MLFOA. This device achieves an impressive resolution of <430nm> <tex-math>$430mu $ </tex-math></inline-formula>\u0000m\u0000<inline-formula> <tex-math>$^{mathbf {2}}$ </tex-math></inline-formula>\u0000 without using any algorithm processing and film, the highest among the compact microscopes to our best knowledge. The material (refractive index, NA), the diameter, the light wavelength, immerse liquid of the microsphere is measured by using the MLFOA. The device can potentially be expandable for the point-of-care testing (POCT) detection.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High Bandwidth GaN-Based Micro-LEDs at Temperatures up to 400 ∘C 温度高达 400°C 时的高带宽氮化镓基微型 LED
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-29 DOI: 10.1109/LPT.2024.3434601
Daniel J. Rogers;Haotian Xue;Fred A. Kish;Fu-Chen Hsiao;Bardia Pezeshki;Alexander Tselikov;Jonathan J. Wierer
{"title":"High Bandwidth GaN-Based Micro-LEDs at Temperatures up to 400 ∘C","authors":"Daniel J. Rogers;Haotian Xue;Fred A. Kish;Fu-Chen Hsiao;Bardia Pezeshki;Alexander Tselikov;Jonathan J. Wierer","doi":"10.1109/LPT.2024.3434601","DOIUrl":"10.1109/LPT.2024.3434601","url":null,"abstract":"Gallium-nitride-based, blue micro-light-emitting diodes (micro-LEDs) with electro-optical −3 dB modulation bandwidths of 3.73 GHz at 11 kA/cm2 at room temperature and 4.00 GHz at 9 kA/cm2 at 200°C are reported. These bandwidths are the highest reported thus far for micro-LEDs. The micro-LEDs operate at high temperatures, up to 400°C, and bandwidths improve with increased temperatures. The lifetimes and recombination rates of the micro-LEDs active layer are determined by measuring and analyzing the impedance, modulation response, and radiative efficiency. This analysis shows increasing bandwidths with increasing current density and temperature resulting from dominant non-radiative lifetimes.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
200 Gb/s/λ Bidirectional Coherent PON Solutions Demonstrated Over Field Installed Fiber 通过现场安装光纤演示 200 Gb/s/λ 双向相干 PON 解决方案
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-29 DOI: 10.1109/LPT.2024.3434640
Istvan Bence Kovacs;Md. Saifuddin Faruk;Adrian Wonfor;Seb J. Savory
{"title":"200 Gb/s/λ Bidirectional Coherent PON Solutions Demonstrated Over Field Installed Fiber","authors":"Istvan Bence Kovacs;Md. Saifuddin Faruk;Adrian Wonfor;Seb J. Savory","doi":"10.1109/LPT.2024.3434640","DOIUrl":"10.1109/LPT.2024.3434640","url":null,"abstract":"We demonstrate 200 Gb/s bidirectional coherent PON solutions using a simplified optical network unit (ONU) over 19 km of field-installed fiber. The ONU receiver is a single-polarization heterodyne detector with either a balanced or a single-ended photodetector and the transmitter is based on dual-polarization electro-absorption modulated laser (EML). The optical line terminal (OLT) uses standard dual-polarization coherent transceivers. The downstream solutions achieve 37 dB and 30.5 dB power budget for the receiver with balanced and single-ended photodiodes, respectively. For the upstream, two line rates have been investigated: 200 Gb/s/\u0000<inline-formula> <tex-math>$lambda $ </tex-math></inline-formula>\u0000 for symmetrical transmission and 100 Gb/s/\u0000<inline-formula> <tex-math>$lambda $ </tex-math></inline-formula>\u0000 for asymmetric transmission achieving a power budget of 30.1 dB and 40.9 dB respectively.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Compound Cavity Distributed Feedback Laser with Bandwidth Over 50 GHz Based on Uniform Gratings 基于均匀光栅、带宽超过 50 GHz 的复合腔分布反馈激光器
IF 2.6 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-29 DOI: 10.1109/lpt.2024.3434623
Zhipeng Dou, Jian Wang, Changzheng Sun, Bing Xiong, Zhibiao Hao, Lai Wang, Yanjun Han, Hongtao Li, Lin Gan, Yi Luo
{"title":"A Compound Cavity Distributed Feedback Laser with Bandwidth Over 50 GHz Based on Uniform Gratings","authors":"Zhipeng Dou, Jian Wang, Changzheng Sun, Bing Xiong, Zhibiao Hao, Lai Wang, Yanjun Han, Hongtao Li, Lin Gan, Yi Luo","doi":"10.1109/lpt.2024.3434623","DOIUrl":"https://doi.org/10.1109/lpt.2024.3434623","url":null,"abstract":"","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Influence of Pyroelectric Effect on the Stability of Optical Parameters in Ti:LiNbO3 Modulators 热释电效应对 Ti:LiNbO3 调制器中光学参数稳定性的影响
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-25 DOI: 10.1109/LPT.2024.3433409
Alena Shulepova;Stanislav Aksarin;Vladimir Shulepov;Vladimir Strigalev
{"title":"The Influence of Pyroelectric Effect on the Stability of Optical Parameters in Ti:LiNbO3 Modulators","authors":"Alena Shulepova;Stanislav Aksarin;Vladimir Shulepov;Vladimir Strigalev","doi":"10.1109/LPT.2024.3433409","DOIUrl":"10.1109/LPT.2024.3433409","url":null,"abstract":"In this letter, we present the results of the study of the pyroelectric effect in Ti:LiNbO3 titanium diffusion waveguides formed on an X-cut substrate, which are the basis for the creation of phase modulators. This letter presents an analysis of the contribution of pyroelectric phase drift, its magnitude, and the relaxation time characteristics of the charges causing the drift. The measurements were carried out interferometrically in the circuit of a fiber-optic Mach-Zehnder interferometer. The final part of the experimental study shows the results of significant suppression of the pyroelectric effect in the modulator. Moreover, reductive annealing of the crystal in hydrogen-nitrogen medium does not deteriorate the optical transmission properties of the waveguide. The prospective application of this method in the fabrication of Ti:LiNbO3 phase modulators is also evaluated.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Route to All-Fiber Mamyshev Spatiotemporal Mode-Locked Laser With High Average Power/Pulse Energy 实现高平均功率/脉冲能量的全光纤马米舍夫时空模式锁定激光器的途径
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2024-07-24 DOI: 10.1109/LPT.2024.3432875
Jintao Qiu;Xinhe Dou;Bole Song;Feihong Qiao;Xiang Li;Shan Wang;Zhiguo Lv
{"title":"Route to All-Fiber Mamyshev Spatiotemporal Mode-Locked Laser With High Average Power/Pulse Energy","authors":"Jintao Qiu;Xinhe Dou;Bole Song;Feihong Qiao;Xiang Li;Shan Wang;Zhiguo Lv","doi":"10.1109/LPT.2024.3432875","DOIUrl":"10.1109/LPT.2024.3432875","url":null,"abstract":"Spatiotemporal mode-locked (STML) fiber lasers exhibit potential for high-average-power output owing to larger mode field diameter in multimode fibers and great pump tolerance. However, the average power from the most of the reported STML lasers still remains in the order of several hundred milliwatts, or even lower, contrary to the virtues of multimode fibers. In this work, we construct an all-fiber Mamyshev STML laser and experimentally explore the influence of cavity losses on average power. By optimizing spatial mode filtering, regulating intra-cavity nonlinearity and compensating inter-modal group delay differences, spatiotemporal pulses with average power/pulse energy up to 2 W/135 nJ can be obtained with 2.2 ps temporal widths. Our study substantially expands the design possibilities for more powerful all-fiber STML lasers, rendering them much more amenable for practical implementation.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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