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310-km FM-Conversion A-RoF-Transmission Experiment Using Chirped Fiber Bragg Gratings
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-12 DOI: 10.1109/LPT.2025.3550504
Toshiaki Shitaba;Ryo Miyatake;Youichi Fukada;Akihiro Tanabe;Kaito Okada;Masayoshi Sekiguchi;Tomoaki Yoshida
{"title":"310-km FM-Conversion A-RoF-Transmission Experiment Using Chirped Fiber Bragg Gratings","authors":"Toshiaki Shitaba;Ryo Miyatake;Youichi Fukada;Akihiro Tanabe;Kaito Okada;Masayoshi Sekiguchi;Tomoaki Yoshida","doi":"10.1109/LPT.2025.3550504","DOIUrl":"https://doi.org/10.1109/LPT.2025.3550504","url":null,"abstract":"The world’s longest transmission distance for a commercial frequency modulation (FM)-conversion analog-radio over-fiber system exceeds 300 km. This system multiplexes community antenna television /broadcasting satellite / communication satellite video signals with frequencies from 90 MHz to 2.1 GHz, converts them into optical signals, and transmits them from the broadcaster building to customer houses. In the FM-conversion system, dispersion compensating fibers (DCFs) are used to compensate for the chromatic dispersion generated in the transmission optical fiber. However, due to the risk of DCF depletion in the long term, it is necessary to consider alternative dispersion-compensation configuration. Therefore, we propose a chirped fiber Bragg grating (CFBG) dispersion-compensation configuration and conducted an FM-conversion long-distance- transmission experiment using this configuration and evaluated its applicability. We clarified that the carrier-to-noise ratio is improved by arranging CFBGs in front of the transmission fiber, compared with using DCFs.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 8","pages":"437-440"},"PeriodicalIF":2.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688084","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
64-Gbit/s Optical-Domain Encrypted Chaotic Secure Communication Over 110-km Commercial Fiber
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-12 DOI: 10.1109/LPT.2025.3550567
Jiacheng Feng;Lin Jiang;Lianshan Yan;Anlin Yi;Wei Pan
{"title":"64-Gbit/s Optical-Domain Encrypted Chaotic Secure Communication Over 110-km Commercial Fiber","authors":"Jiacheng Feng;Lin Jiang;Lianshan Yan;Anlin Yi;Wei Pan","doi":"10.1109/LPT.2025.3550567","DOIUrl":"https://doi.org/10.1109/LPT.2025.3550567","url":null,"abstract":"As a physical layer secure transmission scheme, optical chaotic communication has garnered significant attention for its notable advantages in transmission rate and transmission distance. However, issues like fiber link damage and hardware mismatches between transmitter and receiver hinder its advancement to higher speeds and longer distance. In this letter, we experimentally demonstrate chaotic secure communication of a 64 Gbit/s PAM-4 signal transmitted over 250km using a chaotic optoelectronic oscillator (OEO) system, achieving record-breaking capacity-distance products of 16000-Gbit/s•km in optical-domain encrypted chaotic secure communication using single-core SMF. In our laboratory validation, we utilized ultra-low-loss (~0.155dB/km), large-effective-area (<inline-formula> <tex-math>$sim 150~mu $ </tex-math></inline-formula>m2) SMF to reduce link losses and enhance OSNR at the receiver. A multi-span dispersion-managed fiber link, along with decision-directed least-mean square (DD-LMS) algorithm, is employed to address amplitude distortion caused by the fiber, modulation, and synchronization mismatches. Furthermore, we also successfully demonstrated in a 110-km deployed commercial optical fiber in Chengdu, China, presenting a cost-effective approach to strengthening commercial optical network security.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 7","pages":"425-428"},"PeriodicalIF":2.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654922","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 Sensitivity Temperature Sensing Based on Intermodal Coupling of a Tapered Multicore Fiber
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-11 DOI: 10.1109/LPT.2025.3549906
Ying Chen;Wei Zhang;Yubo Liu;Yuxuan Qi;Jiacheng Lv;Zhuoran Yu;Hailong Liu;Jiasheng Ni;Yanjie Zhao
{"title":"High Sensitivity Temperature Sensing Based on Intermodal Coupling of a Tapered Multicore Fiber","authors":"Ying Chen;Wei Zhang;Yubo Liu;Yuxuan Qi;Jiacheng Lv;Zhuoran Yu;Hailong Liu;Jiasheng Ni;Yanjie Zhao","doi":"10.1109/LPT.2025.3549906","DOIUrl":"https://doi.org/10.1109/LPT.2025.3549906","url":null,"abstract":"A high-sensitivity fiber-optic temperature sensor consisting of a cascaded structure of multimode fiber (MMF), tapered seven-core fiber (TSCF) and multimode fiber (MMF) is proposed. The characteristics of the MMF-TSCF-MMF structure, referred to as the MTSCM, are analyzed and simulated using the beam propagation method (BPM) both before and after the seven-core fiber (SCF) is tapered. Simulations indicate a fiber Mach-Zehnder interferometer (MZI) is formed within the structure. Both simulation and experimental results demonstrate that the MTSCM structure exhibits a stronger evanescent field and more surrounding core and cladding modes. A sensitivity of −760 pm/°C is achieved by using MTSCM structure sensor in temperature measurement, significantly higher than that of the MSCM structure sensor. The proposed sensor holds a great potential for marine environment detection.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 7","pages":"417-420"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654919","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
Single-Cavity Dual-Comb Fiber Laser Enabled Pump-Probe Microscopy
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-11 DOI: 10.1109/LPT.2025.3549875
Dongyuan Li;Weiqi Jiang;Jiahe Li;Xuecheng Wu;Yafei Meng;Rong Zhang;Fengqiu Wang
{"title":"Single-Cavity Dual-Comb Fiber Laser Enabled Pump-Probe Microscopy","authors":"Dongyuan Li;Weiqi Jiang;Jiahe Li;Xuecheng Wu;Yafei Meng;Rong Zhang;Fengqiu Wang","doi":"10.1109/LPT.2025.3549875","DOIUrl":"https://doi.org/10.1109/LPT.2025.3549875","url":null,"abstract":"Pump-probe technique is an important spectroscopic method for characterizing photocarrier dynamics in semiconductors. When combined with fast scanning mechanisms, pump-probe spectroscopy can yield spatially relevant information and is highly desirable for advanced characterization of materials. A conventional pump-probe microscopy system requires an optical delay-line to vary the time delay between the pump and the probe pulses, which poses a significant bottleneck for the imaging speed. Thanks to the method of asynchronous optical sampling, the data acquisition speed in a pump-probe measurement can be dramatically improved by using dual-comb light sources. However, commercially available dual-comb sources are bulky systems with complicated stabilization mechanisms, making their wide use in pump-probe imaging systems a challenge. In this letter, we demonstrate a pump-probe microscopy system enabled by a single-cavity dual-comb Er-doped fiber laser for the first time. The single-point data acquisition time is reduced to less than 6 ms. By using this single-cavity dual-comb source, an InGaAs quantum-well sample with millimeter lateral dimension has been characterized, and meaningful images showing surface defective sites are clearly presented. These results provide a new solution for fast and cost-effective pump-probe imaging systems.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 7","pages":"405-408"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654921","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
RF Equivalent Circuit Model for GeSi Quantum Confined Stark Effect Electro-Absorption Modulators
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-11 DOI: 10.1109/LPT.2025.3549943
Ahmed Kandeel;Minkyu Kim;Amir Shahin;Peter De Heyn;Chih-Kuo Neil Tseng;Javad Rahimi Vaskasi;Yosuke Shimura;Maumita Chakrabarti;Dimitrios Velenis;Dries Van Thourhout;Filippo Ferraro;Yoojin Ban;Joris Van Campenhout
{"title":"RF Equivalent Circuit Model for GeSi Quantum Confined Stark Effect Electro-Absorption Modulators","authors":"Ahmed Kandeel;Minkyu Kim;Amir Shahin;Peter De Heyn;Chih-Kuo Neil Tseng;Javad Rahimi Vaskasi;Yosuke Shimura;Maumita Chakrabarti;Dimitrios Velenis;Dries Van Thourhout;Filippo Ferraro;Yoojin Ban;Joris Van Campenhout","doi":"10.1109/LPT.2025.3549943","DOIUrl":"https://doi.org/10.1109/LPT.2025.3549943","url":null,"abstract":"We present an RF equivalent circuit model for GeSi quantum confined stark effect (QCSE) electro-absorption modulator (EAM) integrated in a 300 mm Si photonics platform. The model incorporates two key components: the first captures the contributions from interconnects and bondpads, while the second represents the electrical and optical characteristics of the modulator. The model is validated by fitting it to measured S11 parameters across various EAM lengths under different bias conditions. The derived circuit parameters are subsequently employed to simulate the electro-optic S21 response, successfully estimating the EAM 3dB bandwidth in a good agreement with the measured small-signal modulation response. Additionally, deeper insights about the physical interpretation of the S11 data are obtained by converting the S11 to the impedance (Z) domain. Our model facilitates the analysis of EAM performance under high-speed operation, identifying the limiting factors for further speed enhancement.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 7","pages":"421-424"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655022","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 Speed Single Pixel Imaging Measurement Value Classification Through Multi-Layer Perceptron
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-11 DOI: 10.1109/LPT.2025.3549832
Ziyang Chen;Ping Lu;Weiqiang Ding;Hongyan Shi
{"title":"High Speed Single Pixel Imaging Measurement Value Classification Through Multi-Layer Perceptron","authors":"Ziyang Chen;Ping Lu;Weiqiang Ding;Hongyan Shi","doi":"10.1109/LPT.2025.3549832","DOIUrl":"https://doi.org/10.1109/LPT.2025.3549832","url":null,"abstract":"The slow reconstruction process of single-pixel imaging makes it difficult to apply to dynamic scenes, and it also causes serious computational waste for the reconstruction of objectless data. To address this, we propose a method of using multi-layer perceptron to achieve high-speed screening and object detection of single pixel imaging data. This method achieves a detection rate of 2500 frames per second (fps) and an accuracy of 94.98% on the MNIST dataset. The classification accuracy of our proposed method is 87.8% at 0.77% sampling rate and in real scene tests, and it maintains good performance under 10% random noise.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 8","pages":"441-444"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688169","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
Determination of the Scattering Length (Γ → L) by the Electrically Pumped Germanium Zener Emitter
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-11 DOI: 10.1109/LPT.2025.3549829
Michael Hack;Lukas Seidel;Maurice Wanitzek;Michael Oehme;Alwin Daus;Jörg Schulze;Daniel Schwarz
{"title":"Determination of the Scattering Length (Γ → L) by the Electrically Pumped Germanium Zener Emitter","authors":"Michael Hack;Lukas Seidel;Maurice Wanitzek;Michael Oehme;Alwin Daus;Jörg Schulze;Daniel Schwarz","doi":"10.1109/LPT.2025.3549829","DOIUrl":"https://doi.org/10.1109/LPT.2025.3549829","url":null,"abstract":"This letter presents a theoretical analysis and experimental validation of the scattering length of direct electrons <inline-formula> <tex-math>$L_{mathrm {dn}}$ </tex-math></inline-formula> in the Germanium Zener Emitter, a promising candidate for integrated low-temperature optical pump sources on the silicon platform. With the increasing demand for stable quantum photonic integrated circuits, efficient optical pump sources operating at cryogenic temperatures are essential. Experimental results demonstrate that reducing the n+ Ge thickness <inline-formula> <tex-math>$d_{mathrm {n-Ge}}$ </tex-math></inline-formula> to 50 nm enhances the optical power density <inline-formula> <tex-math>$P_{mathrm {opt}}$ </tex-math></inline-formula> by a factor of 9. These findings highlight the potential of the Germanium Zener Emitter to address the need for efficient, cryogenically compatible optical sources in quantum photonic integrated circuits.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 7","pages":"409-412"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10921657","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Gigahertz Repetition Rate Kerr-Lens Mode-Locked Oscillator With Above 7-W Average Power
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-06 DOI: 10.1109/LPT.2025.3548848
Li Zheng;Jie Tao;Xinkuan Wang;Tuanjun Han;Chaojun Huang;Wenlong Tian;Geyang Wang;Yang Yu;Zhiyi Wei;Jiangfeng Zhu
{"title":"Gigahertz Repetition Rate Kerr-Lens Mode-Locked Oscillator With Above 7-W Average Power","authors":"Li Zheng;Jie Tao;Xinkuan Wang;Tuanjun Han;Chaojun Huang;Wenlong Tian;Geyang Wang;Yang Yu;Zhiyi Wei;Jiangfeng Zhu","doi":"10.1109/LPT.2025.3548848","DOIUrl":"https://doi.org/10.1109/LPT.2025.3548848","url":null,"abstract":"We present a soft-aperture Kerr-lens mode-locked Yb:KGW oscillator capable of generating multi-watt average output power at gigahertz repetition rate. Using a dual-confocal ring cavity design, the laser waist inside the Yb:KGW crystal matched well with a multi-mode fiber-coupled laser diode. At the pump power of 42 W, double-pulse modelocking is observed due to high-power operation, and the transition from double-pulse operation to single-pulse operation is realized when increasing the negative intracavity group delay dispersion. The stable single-pulse modelocking with 7.73-W average output power and 189-fs pulse duration at 1.68-GHz is achieved. This is the highest average output power ever reported from any soft-aperture Kerr-lens mode-locked (KLM) oscillators operating at GHz repetition rate, as far as we are aware.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 6","pages":"357-360"},"PeriodicalIF":2.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601944","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
AlInGaAs/InP 1.55-μm High-Index-Contrast Circular Beam Edge-Emitting Semiconductor Lasers
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-05 DOI: 10.1109/LPT.2025.3548409
Jideofor A. H. Odoeze;Douglas C. Hall
{"title":"AlInGaAs/InP 1.55-μm High-Index-Contrast Circular Beam Edge-Emitting Semiconductor Lasers","authors":"Jideofor A. H. Odoeze;Douglas C. Hall","doi":"10.1109/LPT.2025.3548409","DOIUrl":"https://doi.org/10.1109/LPT.2025.3548409","url":null,"abstract":"We experimentally demonstrate deep-etched 1550 nm AlInGaAs/InP single spatial mode high-index-contrast ridge waveguide (HIC RWG) edge-emitter semiconductor diode lasers operating with a non-astigmatic circular output beam, achieving a total output power of 23 mW cw and 31 mW pulsed for unbonded die. By selectively wet etching the AlInGaAs graded-index separate confinement heterostructure (GRINSCH) laterally inward from the sidewalls of a <inline-formula> <tex-math>$6.75~mu $ </tex-math></inline-formula>m dry-etched ridge, the remaining <inline-formula> <tex-math>$2.67~mu $ </tex-math></inline-formula>m active core yields a circular <inline-formula> <tex-math>$2.6~mu $ </tex-math></inline-formula>m <inline-formula> <tex-math>$1/e^{2}$ </tex-math></inline-formula> width TEM00 Gaussian near field mode with ~30° FWHM far field divergence angle for both X and Y axes.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 6","pages":"361-364"},"PeriodicalIF":2.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601973","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 Complexity Carrier Recovery Based on Gradient Descent for Optical Communication
IF 2.3 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2025-03-05 DOI: 10.1109/LPT.2025.3548171
Jing Sun;Jingzhong Guo;Dizhu Wang;Yi Ren;Xuejiao Zhang;Xiang Chen;Huijian Liang
{"title":"Low Complexity Carrier Recovery Based on Gradient Descent for Optical Communication","authors":"Jing Sun;Jingzhong Guo;Dizhu Wang;Yi Ren;Xuejiao Zhang;Xiang Chen;Huijian Liang","doi":"10.1109/LPT.2025.3548171","DOIUrl":"https://doi.org/10.1109/LPT.2025.3548171","url":null,"abstract":"A carrier recovery algorithm based on gradient descent with parallelized architecture is proposed for BPSK/QPSK modulated optical communication, and the recovery performance has been validated experimentally. A simplified Mth-power operation implementation method is introduced, which considerably lowers the algorithm complexity. Experimental results demonstrate that, with the proposed algorithm in this letter, both quick tracking ability and stable estimation accuracy comparable to the LKF-based algorithm can be achieved, which is better than the traditional FFT&VV and Diff&VV algorithms under different SNR; moreover, for BPSK/QPSK switchable system, it can save 36.3% of CLB LUTs and 30.9% of CLB registers FPGA chip resource compared to the LKF-based algorithm, within a 64-channel FPGA-based parallel architecture.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 7","pages":"413-416"},"PeriodicalIF":2.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688156","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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