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Indoor Visible Light Tilt-Resilient Positioning Based on RSS Fingerprint Self-Transferability 基于RSS指纹自转移性的室内可见光倾斜弹性定位
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-16 DOI: 10.1109/LPT.2025.3561215
Lijun Deng;Yangyu Fan;Qiong Zhao
{"title":"Indoor Visible Light Tilt-Resilient Positioning Based on RSS Fingerprint Self-Transferability","authors":"Lijun Deng;Yangyu Fan;Qiong Zhao","doi":"10.1109/LPT.2025.3561215","DOIUrl":"https://doi.org/10.1109/LPT.2025.3561215","url":null,"abstract":"In this letter, we propose a tilt-resilient positioning method based on received signal strength (RSS) fingerprint self-transfer learning to solve function failure or a reduction in the accuracy of the indoor visible light positioning (VLP) system under tilt receiving and to improve its practicability and reliability in the actual environment. Based on the modified path loss (PL) exponent model, the vertical RSS fingerprints can self-transfer to the tilted RSS fingerprints of arbitrary receiving direction (RD) in the online stage. The constructed tilted RSS fingerprint databsae have the same granularity and dimension as the vertical RSS fingerprint database, making the proposed method have the capability of rapid learning and positioning while completing RSS fingerprint self-transfer. The simulation results show that the proposed method achieves a higher positioning accuracy compared to the other three methods without adding the labor and time costs of RSS measurement caused by the multidimensionality of the RD at each fingerprint point. In the case of dense and sparse light-emitting diode (LED) distributions, when the receiver tilt angle is 31°, the root mean square errors of the proposed method are approximately 4.21cm and 3.52cm in the 10cm<inline-formula> <tex-math>$times 10$ </tex-math></inline-formula>cm grid size, and the average positioning errors are approximately 3.09cm and 2.43cm, respectively.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 12","pages":"679-682"},"PeriodicalIF":2.3,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117173","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
Low Intensity Noise Ring-Cavity Single-Frequency Fiber Laser Using Filter Characterizing Technique 低强度噪声环腔单频光纤激光器的滤波表征技术
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-15 DOI: 10.1109/LPT.2025.3560660
Ziqi Zheng;Zhaoan Li;Fengjie Wang;Xiaohui Ma;Wentan Fang;Xiaolin Chen;Wei Zhang;Song Huang;Yong Zhou;Weiqing Gao
{"title":"Low Intensity Noise Ring-Cavity Single-Frequency Fiber Laser Using Filter Characterizing Technique","authors":"Ziqi Zheng;Zhaoan Li;Fengjie Wang;Xiaohui Ma;Wentan Fang;Xiaolin Chen;Wei Zhang;Song Huang;Yong Zhou;Weiqing Gao","doi":"10.1109/LPT.2025.3560660","DOIUrl":"https://doi.org/10.1109/LPT.2025.3560660","url":null,"abstract":"We demonstrate a single-frequency fiber laser (SFFL) with sub-kHz linewidth and ultra-low intensity noise, which is realized by a ring configuration. A newly generalized method to characterize ultra-narrow bandwidth filters and thus avoid mode hopping is proposed, which involves the Kramers-Kronig relation and I-Q demodulation. The resulting SFEL exhibits a narrow linewidth of 0.6 kHz at the wavelength of 1545.35 nm. Also, the mode-hopping-free operation is verified by a scanning F-P interferometer and self-heterodyne method, respectively. The time trace and power monitor present the power variations of 0.02 dB @ 400 ms and 0.05 dB @ 1 h, respectively. The relative intensity noise base caused by shot noise is −147dBc/Hz (>100kHz). The relaxation oscillation peak reaches −130dBc/Hz, which is 30 dB lower than that of commercial SFFL.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 13","pages":"693-696"},"PeriodicalIF":2.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117352","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
Laser Swept-Frequency Feedback Interferometry for Three-Dimensional Displacement Measurement 三维位移测量的激光扫频反馈干涉法
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-15 DOI: 10.1109/LPT.2025.3560651
Ruiqian Sun;Qinyu Li;Jie Shan;Wei Xia;Dongmei Guo
{"title":"Laser Swept-Frequency Feedback Interferometry for Three-Dimensional Displacement Measurement","authors":"Ruiqian Sun;Qinyu Li;Jie Shan;Wei Xia;Dongmei Guo","doi":"10.1109/LPT.2025.3560651","DOIUrl":"https://doi.org/10.1109/LPT.2025.3560651","url":null,"abstract":"Laser feedback interference occurs when the output of a laser is reflected or scattered back to the laser cavity by a remote target, mixing with the light inside the cavity. This letter designs a laser swept-frequency feedback interferometer (LFI) for measuring three-dimensional (3D) displacement. By combining a reflective two-dimensional (2D) crossed grating with a laser feedback interferometer, the measurement system employs the grating pitch as the measurement scale rather than the wavelength, offering improved resistance to environmental disturbances. By introducing the optical frequency-modulated continuous-wave technique inspired by radar, the measurement system can perform real-time 3D displacement measurements using only a single laser source. Experimental results indicate that the relative error of 3D displacement measurement using this method is less than 0.42%, while achieving nanometer-level resolution. The proposed optical structure offers the benefits of simplicity, robustness, and cost-effectiveness.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 9","pages":"549-552"},"PeriodicalIF":2.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865243","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
Non-Ambiguous Microwave Frequency Measurement Based on Triple Electro-Optic Frequency Comb 基于三重电光频率梳的微波无模糊频率测量
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-15 DOI: 10.1109/LPT.2025.3560700
Zhengchao Yuan;Xinyu Fan;Peiyuan Sun;Yangyang Wan;Bingxin Xu;Zuyuan He
{"title":"Non-Ambiguous Microwave Frequency Measurement Based on Triple Electro-Optic Frequency Comb","authors":"Zhengchao Yuan;Xinyu Fan;Peiyuan Sun;Yangyang Wan;Bingxin Xu;Zuyuan He","doi":"10.1109/LPT.2025.3560700","DOIUrl":"https://doi.org/10.1109/LPT.2025.3560700","url":null,"abstract":"Optical frequency comb serves as precise rulers in physical quantity measurements, using the Vernier measurement principle by configuring a multi-comb system. We propose a non-ambiguous microwave frequency measurement system based on triple comb generated by electro-optic modulation. The triple combs with slightly different repetition rates sample the unknown microwave signal. Utilizing mathematical principles of non-ambiguous measurement, the system achieves high-precision static signal measurements and real-time dynamic signal tracking. Limited by the modulation bandwidth of modulator, the system attains a detection range from 0 to 30 GHz. Leveraging the electro-optic comb’s flexibility, optical comb repetition rates can be tailored to receiver bandwidths. The dynamic range of microwave signal power is from -30 dBm to -10 dBm. In instantaneous frequency measurement of dynamic signal, error-free measurement can be achieved at a resolution of 1 MHz. The spectral stability of the triple combs based on electro-optic modulation is not affected by temperature and vibration, which ensures that the microwave frequency measurement has a high robustness in a variety of measurement environments.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 14","pages":"749-752"},"PeriodicalIF":2.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117218","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
Resource Allocation for SLIPT-Enabled Hybrid OFDMA-NOMA VLC System 滑移使能OFDMA-NOMA混合VLC系统的资源分配
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-15 DOI: 10.1109/LPT.2025.3560720
Danyang Chen;Zhiyu Ren;Qingxuan Wang;Rui Hao;Jianping Wang
{"title":"Resource Allocation for SLIPT-Enabled Hybrid OFDMA-NOMA VLC System","authors":"Danyang Chen;Zhiyu Ren;Qingxuan Wang;Rui Hao;Jianping Wang","doi":"10.1109/LPT.2025.3560720","DOIUrl":"https://doi.org/10.1109/LPT.2025.3560720","url":null,"abstract":"This letter investigates a simultaneous lightwave information and power transfer (SLIPT)-enabled hybrid orthogonal frequency division multiple access and non-orthogonal multiple access (OFDMA-NOMA) technology for visible light communication (VLC) systems operating in a high-frequency fading channel. An optimization problem considering information receiving and energy harvesting performance is formulated by jointly adjusting the inter-pair power allocation factor, direct current bias, and power splitting coefficient. A resource allocation scheme based on a modified arithmetic optimization algorithm (m-AOA) is adopted. The results demonstrate that the proposed resource allocation scheme improves energy efficiency (EE) of the SLIPT-enabled hybrid multiple access VLC system by 15%, while the user fairness is also enhanced compared to the conventional fixed power allocation scheme.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 12","pages":"667-670"},"PeriodicalIF":2.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929646","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 Electro-Optic Modulator By Embedding Structure 基于嵌入结构的高性能薄膜铌酸锂电光调制器
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-15 DOI: 10.1109/LPT.2025.3561110
Shuxiang Song;Haisheng Li;Jiayu Yang;Yihui Yin;Wanli Yang;Yue Li;Hangyu Li;Mingcan Cen
{"title":"High-Performance Thin Film Lithium Niobate Electro-Optic Modulator By Embedding Structure","authors":"Shuxiang Song;Haisheng Li;Jiayu Yang;Yihui Yin;Wanli Yang;Yue Li;Hangyu Li;Mingcan Cen","doi":"10.1109/LPT.2025.3561110","DOIUrl":"https://doi.org/10.1109/LPT.2025.3561110","url":null,"abstract":"Electro-optic modulators with low driving voltage and wide bandwidth are critical for advanced analog and digital communication systems. Improving the modulation efficiency of thin-film lithium niobate (TFLN) modulators is essential to reducing drive voltage and device length, thereby enabling compact chip integration and enhanced modulation bandwidth. This work introduces a novel TFLN modulator featuring an embedded dual capacitance-loaded traveling-wave electrode (EDC-TWE) to achieve superior electro-optic modulation efficiency and minimized optical loss. The fabricated modulator, with a 10-mm-long modulation region, achieves a half-wave voltage of 1.45 V and an electro-optic modulation bandwidth exceeding 40 GHz, demonstrating its potential for high-performance optical communication applications.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 13","pages":"701-704"},"PeriodicalIF":2.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117199","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
Static Magnetic Field Swaps Slow and Fast Light in a V-Type Degenerate Media 静态磁场在v型简并介质中交换慢光和快光
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-10 DOI: 10.1109/LPT.2025.3559511
Hoang Minh Dong;Thai Doan Thanh;Nguyen Huy Bang;Le Van Doai
{"title":"Static Magnetic Field Swaps Slow and Fast Light in a V-Type Degenerate Media","authors":"Hoang Minh Dong;Thai Doan Thanh;Nguyen Huy Bang;Le Van Doai","doi":"10.1109/LPT.2025.3559511","DOIUrl":"https://doi.org/10.1109/LPT.2025.3559511","url":null,"abstract":"In this letter, we propose a novel mechanism for controlling the slow and fast light propagation in a Doppler-broadened V-type degenerate atomic medium under the influence of a static magnetic field. We have demonstrated that the optical response of the medium can be switched from transparent to absorptive at the resonance frequency center by turning the magnetic field on/off. Using a static magnetic field as a tuning “knob,” we can control the magnitude and sign of the group refractive index by changing the magnitude or direction of the magnetic field, enabling the transition of a light pulse from ultraslow to ultrafast propagation. In addition, the required switching times from slow to fast light propagation are also presented. In particular, the results are applied in a room-temperature medium under the influence of the Doppler effect, which makes the model close to the realistic experiments. The research results are valid for quantum information storage and processing devices.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 15","pages":"813-816"},"PeriodicalIF":2.3,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117342","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
Bent Directional Couplers for Broadband Silicon Photonic Interleavers 宽带硅光子交织器的弯曲定向耦合器
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-10 DOI: 10.1109/LPT.2025.3559524
Weiwei Pan;Ruoyun Yao;Jinhua Chen;Yu Cheng;Xudong Du;Chen Ji
{"title":"Bent Directional Couplers for Broadband Silicon Photonic Interleavers","authors":"Weiwei Pan;Ruoyun Yao;Jinhua Chen;Yu Cheng;Xudong Du;Chen Ji","doi":"10.1109/LPT.2025.3559524","DOIUrl":"https://doi.org/10.1109/LPT.2025.3559524","url":null,"abstract":"We experimentally demonstrate a broadband silicon photonic interleaver based on an add-drop resonator Mach-Zehnder interferometer (ADRMZI) with bent directional couplers. Utilizing wavelength-insensitive bent directional couplers, the measured crosstalk of the interleaver remains below -10 dB over a 90 nm bandwidth ranging from 1500 nm to 1590 nm, with the channel spacing of approximately 0.8 nm. The device footprint measures <inline-formula> <tex-math>$400~mu $ </tex-math></inline-formula>m <inline-formula> <tex-math>$times 280~mu $ </tex-math></inline-formula>m. The proposed interleaver exhibits an average 1-dB bandwidth of 0.54 nm and an average shape factor (SF), defined as the ratio of the 1-dB bandwidth to the 10-dB bandwidth, of 0.54. This ADRMZI-based interleaver is well-suited for broadband wavelength division multiplexing applications.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 13","pages":"689-692"},"PeriodicalIF":2.3,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117208","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
Weighted Self-Threshold Local Contrast Method for Daytime Shortwave Infrared Adaptive Optics 白天短波红外自适应光学加权自阈值局部对比方法
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-10 DOI: 10.1109/LPT.2025.3559625
Minglu Li;Kainan Yao;Lu Chen;Hongzhuang Li;Yatian Li;Liduo Liu;Yihe Li;Han Cao
{"title":"Weighted Self-Threshold Local Contrast Method for Daytime Shortwave Infrared Adaptive Optics","authors":"Minglu Li;Kainan Yao;Lu Chen;Hongzhuang Li;Yatian Li;Liduo Liu;Yihe Li;Han Cao","doi":"10.1109/LPT.2025.3559625","DOIUrl":"https://doi.org/10.1109/LPT.2025.3559625","url":null,"abstract":"To achieve high-resolution imaging during daytime, we designed a short-wave infrared adaptive optics (SWIR AO) system utilizing the Shack-Hartmann wavefront sensor (SHWS). A weighted self-thresholding local contrast algorithm is proposed to minimize complex background and pixel-sized noise with high brightness (PNHB) in real-time applications. The algorithm effectively suppresses interference while enhancing the signal-to-noise ratio (SNR). The simulations show a higher robustness and lower centroid estimation error, than the traditional algorithm. Further, field experiments were also carried out. Deployed on our SWIR AO of a 4-m telescope, the proposed algorithm yielded a 30-fold peak SNR boost for HIP11698 (6.2Mv), from below 0.28 to 8.49, when the elevation angle of the sun was 37.1°.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 14","pages":"765-768"},"PeriodicalIF":2.3,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117220","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-Power 1178 nm Pulsed Raman Laser Based on KYW Crystal 基于KYW晶体的大功率1178 nm脉冲拉曼激光器
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-04-09 DOI: 10.1109/LPT.2025.3559106
Lei Guo;Chang Liang;Haiping Xu;Xian-An Dou;Hao Zhang;Qing Ye;Hui Kong;Jintian Bian;Kejian Yang;Baitao Zhang;Jianjun Zhang
{"title":"High-Power 1178 nm Pulsed Raman Laser Based on KYW Crystal","authors":"Lei Guo;Chang Liang;Haiping Xu;Xian-An Dou;Hao Zhang;Qing Ye;Hui Kong;Jintian Bian;Kejian Yang;Baitao Zhang;Jianjun Zhang","doi":"10.1109/LPT.2025.3559106","DOIUrl":"https://doi.org/10.1109/LPT.2025.3559106","url":null,"abstract":"A high-power potassium yttrium tungstate (KYW) Raman laser based on an extra-cavity configuration is demonstrated at the first-Stokes wavelength of 1178 nm for the first time. The KYW crystal is pumped by a 1064 nm Q-switched Nd:YAG laser with a repetition frequency of 9 kHz. With an incident pump power of 29 W, the maximum Stokes output power of 4.7 W is obtained with a pulse width of 55.5 ns, and the corresponding slope efficiency is 40.5%. This work provides a good candidate for the generation of 589 nm sodium yellow laser by frequency doubling technology.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 13","pages":"685-688"},"PeriodicalIF":2.3,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117323","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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