Pub Date : 2025-12-16DOI: 10.1109/LPT.2025.3645138
Roberta Palmeri;Davide Guarnera;Giuseppe Torrisi;Giorgio S. Mauro;David Mascali;Alberto Bacci;Nunzio Salerno;Santi C. Pavone;Andrea Locatelli;Gino Sorbello
In this letter, we present a physics-assisted design strategy for tapered suspended slot waveguides operating at $2~mu $ m. The proposed methodology enables a precise control of the optical field, specifically tailored for laser-driven dielectric accelerating structures. By using calibration curves that link the silicon waveguide strips width to both the effective refractive index and the accelerating field amplitude, we ensure local phase synchronism along the propagation axis. The design was performed for an input energy of 79 keV, and validated by HFSS simulations as far as the optical field computation is concerned, and by ASTRA-code for the single-particle beam dynamics. The results show an output energy of 102 keV with the optimized structure, corresponding to 20% increase compared to the previous constant-field approach.
{"title":"Physics-Based Optimization of Tapered Suspended Slot Waveguides for Electron Acceleration","authors":"Roberta Palmeri;Davide Guarnera;Giuseppe Torrisi;Giorgio S. Mauro;David Mascali;Alberto Bacci;Nunzio Salerno;Santi C. Pavone;Andrea Locatelli;Gino Sorbello","doi":"10.1109/LPT.2025.3645138","DOIUrl":"https://doi.org/10.1109/LPT.2025.3645138","url":null,"abstract":"In this letter, we present a physics-assisted design strategy for tapered suspended slot waveguides operating at <inline-formula> <tex-math>$2~mu $ </tex-math></inline-formula>m. The proposed methodology enables a precise control of the optical field, specifically tailored for laser-driven dielectric accelerating structures. By using calibration curves that link the silicon waveguide strips width to both the effective refractive index and the accelerating field amplitude, we ensure local phase synchronism along the propagation axis. The design was performed for an input energy of 79 keV, and validated by HFSS simulations as far as the optical field computation is concerned, and by ASTRA-code for the single-particle beam dynamics. The results show an output energy of 102 keV with the optimized structure, corresponding to 20% increase compared to the previous constant-field approach.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 7","pages":"475-478"},"PeriodicalIF":2.5,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11301778","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929641","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}
Pub Date : 2025-12-16DOI: 10.1109/LPT.2025.3645070
Khouloud Abdelli
An end-to-end spiking neural architecture is pre sented for real-time, energy-efficient mechanical event detection in optical fibers. The system emulates Short-Time Fourier Transform (STFT) processing using biologically inspired spiking neurons to generate time–frequency spike maps from raw state-of-polarization (SOP) signals. A neuromorphic convolutional network then performs event classification and spectral–temporal localization. Evaluated on experimental SOP data over a 2600 km link, the architecture achieves 97% classification accuracy with over 50,$000times $ lower energy consumption than conventional CNNs, enabling scalable edge inference for sustainable optical sensing.
{"title":"An End-to-End Spiking Architecture for Energy-Efficient Mechanical Event Detection in Optical Fibers","authors":"Khouloud Abdelli","doi":"10.1109/LPT.2025.3645070","DOIUrl":"https://doi.org/10.1109/LPT.2025.3645070","url":null,"abstract":"An end-to-end spiking neural architecture is pre sented for real-time, energy-efficient mechanical event detection in optical fibers. The system emulates Short-Time Fourier Transform (STFT) processing using biologically inspired spiking neurons to generate time–frequency spike maps from raw state-of-polarization (SOP) signals. A neuromorphic convolutional network then performs event classification and spectral–temporal localization. Evaluated on experimental SOP data over a 2600 km link, the architecture achieves 97% classification accuracy with over 50,<inline-formula> <tex-math>$000times $ </tex-math></inline-formula> lower energy consumption than conventional CNNs, enabling scalable edge inference for sustainable optical sensing.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"414-417"},"PeriodicalIF":2.5,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145830862","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}
Pub Date : 2025-12-15DOI: 10.1109/LPT.2025.3644331
Julian L. Pita;Jorge Diego Marconi;Michaël Ménard
Tellurite glasses are of high interest in integrated photonics for sensing and, in particular, telecommunications applications, where they serve as key materials for amplification and mid-IR light sources due to their wide transparent window, thermal and mechanical stability, and high optical nonlinearity. In this work, we present two inverse-designed devices for polarization management on a tellurium dioxide platform: a TM-pass polarizer and a polarization beam splitter. The TM-pass polarizer achieves an average simulated transmission efficiency of −0.6 dB and an polarization crosstalk below −20.9 dB across the entire C-band, with a footprint of only ${mathrm {24~ {mu }text {m}}} times {mathrm {6~ {mu }text {m}}}$ . The polarization beam splitter has an ultra-compact footprint of ${mathrm {28~ {mu }text {m}}} times {mathrm {6~ {mu }text {m}}}$ and achieves average TE${}_{ }$ and TM${}_{ }$ transmission efficiencies of approximately −0.4 dB, with crosstalk below −18.3 dB and −27.2 dB, respectively. These are the first freeform devices demonstrated on a tellurium dioxide platform, exhibiting strong robustness to fabrication variations and showcasing the versatility of the platform beyond nonlinear applications.
{"title":"Inverse-Designed Tellurite Devices for Polarization Control","authors":"Julian L. Pita;Jorge Diego Marconi;Michaël Ménard","doi":"10.1109/LPT.2025.3644331","DOIUrl":"https://doi.org/10.1109/LPT.2025.3644331","url":null,"abstract":"Tellurite glasses are of high interest in integrated photonics for sensing and, in particular, telecommunications applications, where they serve as key materials for amplification and mid-IR light sources due to their wide transparent window, thermal and mechanical stability, and high optical nonlinearity. In this work, we present two inverse-designed devices for polarization management on a tellurium dioxide platform: a TM-pass polarizer and a polarization beam splitter. The TM-pass polarizer achieves an average simulated transmission efficiency of −0.6 dB and an polarization crosstalk below −20.9 dB across the entire C-band, with a footprint of only <inline-formula> <tex-math>${mathrm {24~ {mu }text {m}}} times {mathrm {6~ {mu }text {m}}}$ </tex-math></inline-formula>. The polarization beam splitter has an ultra-compact footprint of <inline-formula> <tex-math>${mathrm {28~ {mu }text {m}}} times {mathrm {6~ {mu }text {m}}}$ </tex-math></inline-formula> and achieves average TE<inline-formula> <tex-math>${}_{ }$ </tex-math></inline-formula> and TM<inline-formula> <tex-math>${}_{ }$ </tex-math></inline-formula> transmission efficiencies of approximately −0.4 dB, with crosstalk below −18.3 dB and −27.2 dB, respectively. These are the first freeform devices demonstrated on a tellurium dioxide platform, exhibiting strong robustness to fabrication variations and showcasing the versatility of the platform beyond nonlinear applications.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"422-425"},"PeriodicalIF":2.5,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145830900","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}
Pub Date : 2025-12-15DOI: 10.1109/LPT.2025.3644433
Liudmila Silanteva;Amado M. Velázquez-Benítez;Eloy Montesinos Garrido;Vincent van Vliet;Menno van den Hout;Marianne Bigot-Astruc;Adrian Amezcua Correa;Pierre Sillard;Frank Achten;Chigo Okonkwo;Thomas Bradley
We focus on experimental mode field diameter (MFD) evolution in tapered single-mode (SMF) and few-mode fibers (FMF) with simulations supporting the trends and including a simulation-only case for a three-core coupled-core fiber (CCF3). Experimental measurements on an FMF supporting ten linearly polarized modes, tapered down to $mathrm {1.84~mu text {m} }$ , show close agreement with simulations and confirm the onset of evanescent mode field expansion. Simulations extended to sub-micrometer diameters predict rapid MFD growth below $approx!{mathrm {2~mu text {m} }}$ for several modes. For CCF3, simulations show supermode evolution into LP-like modes under tapering, with increasing MFD at small waist diameters.
我们重点研究了锥形单模（SMF）和少模光纤（FMF）的实验模场直径（MFD）演变，并进行了支持这一趋势的仿真，其中包括三芯耦合芯光纤（CCF3）的仅仿真案例。在支持十种线极化模式的FMF上的实验测量，逐渐减小到$mathrm {1.84~mu text {m} }$，显示出与模拟的密切一致，并证实了倏逝模场扩展的开始。扩展到亚微米直径的模拟预测了几种模式下MFD在$approx!{mathrm {2~mu text {m} }}$以下的快速增长。对于CCF3，模拟结果表明，随着腰径减小，MFD增加，超模态演化为类lp模态。
{"title":"Measurement of Mode Field Expansion in Tapered Space-Division Multiplexing Fibers","authors":"Liudmila Silanteva;Amado M. Velázquez-Benítez;Eloy Montesinos Garrido;Vincent van Vliet;Menno van den Hout;Marianne Bigot-Astruc;Adrian Amezcua Correa;Pierre Sillard;Frank Achten;Chigo Okonkwo;Thomas Bradley","doi":"10.1109/LPT.2025.3644433","DOIUrl":"https://doi.org/10.1109/LPT.2025.3644433","url":null,"abstract":"We focus on experimental mode field diameter (MFD) evolution in tapered single-mode (SMF) and few-mode fibers (FMF) with simulations supporting the trends and including a simulation-only case for a three-core coupled-core fiber (CCF3). Experimental measurements on an FMF supporting ten linearly polarized modes, tapered down to <inline-formula> <tex-math>$mathrm {1.84~mu text {m} }$ </tex-math></inline-formula>, show close agreement with simulations and confirm the onset of evanescent mode field expansion. Simulations extended to sub-micrometer diameters predict rapid MFD growth below <inline-formula> <tex-math>$approx!{mathrm {2~mu text {m} }}$ </tex-math></inline-formula> for several modes. For CCF3, simulations show supermode evolution into LP-like modes under tapering, with increasing MFD at small waist diameters.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"434-437"},"PeriodicalIF":2.5,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145886698","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}
Doxycycline (DOX) is one of the most widely used veterinary antibiotics in animal husbandry, and its residues may affect the health of humans and animals due to the in-creased bacterial resistance. Here we developed a trace DOX detection means based on molecular imprinting technology with tilted fiber Bragg grating surface plasmon resonance (TFBG-SPR). Sputtering a 50 nm thick gold film on the surface of TFBG to excite surface plasmon resonance, and coating a layer of molecularly imprinted polymers (MIPs) on the surface of the gold film to capture DOX. Experimental results show that the proposed sensor shows a detection sensitivity of 1.89 dB/($mu $ g/mL) for DOX in the concentration range of 0.1-$1~mu $ g/mL, with a detection time of about 5 minutes and a detection limit (LOD) of about $0.0323~mu $ g/mL ($0.0672~mu $ M). The obtained LOD is half of that of the current similar DOX sensor. The proposed sensor is expected to provide technical support for real-time trace monitoring of DOX concentration in the environment and food.
{"title":"Trace Doxycycline Detection via Molecular Imprinting Combined With Fiber Surface Plasmon Resonance","authors":"Meijuan Jia;Xiaoyi Wei;Shu Fang;Yunchang Wang;Jie Dong;Jun Zhou;Dingyu Yang;Changyu Shen","doi":"10.1109/LPT.2025.3643129","DOIUrl":"https://doi.org/10.1109/LPT.2025.3643129","url":null,"abstract":"Doxycycline (DOX) is one of the most widely used veterinary antibiotics in animal husbandry, and its residues may affect the health of humans and animals due to the in-creased bacterial resistance. Here we developed a trace DOX detection means based on molecular imprinting technology with tilted fiber Bragg grating surface plasmon resonance (TFBG-SPR). Sputtering a 50 nm thick gold film on the surface of TFBG to excite surface plasmon resonance, and coating a layer of molecularly imprinted polymers (MIPs) on the surface of the gold film to capture DOX. Experimental results show that the proposed sensor shows a detection sensitivity of 1.89 dB/(<inline-formula> <tex-math>$mu $ </tex-math></inline-formula>g/mL) for DOX in the concentration range of 0.1-<inline-formula> <tex-math>$1~mu $ </tex-math></inline-formula>g/mL, with a detection time of about 5 minutes and a detection limit (LOD) of about <inline-formula> <tex-math>$0.0323~mu $ </tex-math></inline-formula>g/mL (<inline-formula> <tex-math>$0.0672~mu $ </tex-math></inline-formula>M). The obtained LOD is half of that of the current similar DOX sensor. The proposed sensor is expected to provide technical support for real-time trace monitoring of DOX concentration in the environment and food.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"394-397"},"PeriodicalIF":2.5,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145808634","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}
Pub Date : 2025-12-11DOI: 10.1109/LPT.2025.3643358
Qida Liu;Le Wang;Shengmei Zhao
Single pixel imaging (SPI) is a novel imaging technique that acquires target information through a single-pixel detector lacking spatial resolution capability. However, the spatial resolution of SPI is restricted by the inherent physical limitations associated with speckle modulation, and the imaging quality is constrained by the requirement for extensive sampling. To overcome these challenges, this letter proposes a high-resolution single-pixel imaging scheme by using subpixel speckle shift technology with physics-driven deep neural networks. Simulation and experimental results show that both the imaging quality and resolution can be significantly improved by our scheme with a lower sampling rate. Moreover, the deep neural network used in our scheme does not require pre-training, which can significantly decrease computational resources. The scheme shows promising potential for applications scenarios demanding efficient high-resolution imaging, such as medical diagnostics and remote sensing.
{"title":"High-Resolution Single Pixel Imaging by Subpixel Speckle Shift and Physics-Driven Neural Networks","authors":"Qida Liu;Le Wang;Shengmei Zhao","doi":"10.1109/LPT.2025.3643358","DOIUrl":"https://doi.org/10.1109/LPT.2025.3643358","url":null,"abstract":"Single pixel imaging (SPI) is a novel imaging technique that acquires target information through a single-pixel detector lacking spatial resolution capability. However, the spatial resolution of SPI is restricted by the inherent physical limitations associated with speckle modulation, and the imaging quality is constrained by the requirement for extensive sampling. To overcome these challenges, this letter proposes a high-resolution single-pixel imaging scheme by using subpixel speckle shift technology with physics-driven deep neural networks. Simulation and experimental results show that both the imaging quality and resolution can be significantly improved by our scheme with a lower sampling rate. Moreover, the deep neural network used in our scheme does not require pre-training, which can significantly decrease computational resources. The scheme shows promising potential for applications scenarios demanding efficient high-resolution imaging, such as medical diagnostics and remote sensing.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"374-377"},"PeriodicalIF":2.5,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145808633","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}
This letter proposes and experimentally validates a reconfigurable distance measurement system leveraging stimulated Brillouin scattering (SBS) to achieve optical pulse compression. The scheme exploits the narrowband gain characteristics of SBS to efficiently compress broadband echo signals into narrow pulses within the optical domain. Target distance is demodulated in real time by directly measuring the time delay of the transmitted signal after pulse compression. This method breaks through the bandwidth limitations of traditional electronic ranging technology and reduces processing latency. Experimental results demonstrate that the system achieves flexible tuning and expansion of distance resolution (<4.12 m) and maximum unambiguous range (up to 750 m). The minimum relative error for long-distance measurements is as low as 0.132%, with a detection sensitivity better than −50 dBm.
{"title":"Reconfigurable Distance Measurement System Based on SBS Optical Pulse Compression","authors":"Shuai Zu;Ying Wang;Pengyuan Huang;Zhenqi Cao;Yiying Gu;Jingjing Hu;Mingshan Zhao","doi":"10.1109/LPT.2025.3642788","DOIUrl":"https://doi.org/10.1109/LPT.2025.3642788","url":null,"abstract":"This letter proposes and experimentally validates a reconfigurable distance measurement system leveraging stimulated Brillouin scattering (SBS) to achieve optical pulse compression. The scheme exploits the narrowband gain characteristics of SBS to efficiently compress broadband echo signals into narrow pulses within the optical domain. Target distance is demodulated in real time by directly measuring the time delay of the transmitted signal after pulse compression. This method breaks through the bandwidth limitations of traditional electronic ranging technology and reduces processing latency. Experimental results demonstrate that the system achieves flexible tuning and expansion of distance resolution (<4.12 m) and maximum unambiguous range (up to 750 m). The minimum relative error for long-distance measurements is as low as 0.132%, with a detection sensitivity better than −50 dBm.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"366-369"},"PeriodicalIF":2.5,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145830863","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}
Pub Date : 2025-12-10DOI: 10.1109/LPT.2025.3642418
Robbe de Mey;Spencer W. Jolly;Alexandre Locquet;Martin Virte
Tunable lasers are essential and versatile tools in photonics, with applications including telecommunications, spectroscopy, and sensing. Advancements have aimed to precisely control the lasing wavelength, expand tuning ranges, suppress mode hopping, and enable photonic integration. In this work, we explore the adaptation of dynamic targeting, a technique originally developed to stabilize lasers under optical feedback, as a method for achieving agile, fast, and continuous wavelength tuning. This technique works by adjusting the feedback rate and phase, enabling a stable and controlled frequency shift. We experimentally demonstrate reliable and reproducible tuning over 2.1 GHz using a free-space optical setup. Simulations further suggest that this approach could extend the tuning range to tens of GHz, with a potential scan speed exceeding $10^{17}$ Hz/s. These results highlight dynamic targeting as a promising route toward agile frequency control in semiconductor lasers for photonic integrated circuits.
{"title":"Agile Laser Wavelength Tuning Using Dynamic Targeting","authors":"Robbe de Mey;Spencer W. Jolly;Alexandre Locquet;Martin Virte","doi":"10.1109/LPT.2025.3642418","DOIUrl":"https://doi.org/10.1109/LPT.2025.3642418","url":null,"abstract":"Tunable lasers are essential and versatile tools in photonics, with applications including telecommunications, spectroscopy, and sensing. Advancements have aimed to precisely control the lasing wavelength, expand tuning ranges, suppress mode hopping, and enable photonic integration. In this work, we explore the adaptation of dynamic targeting, a technique originally developed to stabilize lasers under optical feedback, as a method for achieving agile, fast, and continuous wavelength tuning. This technique works by adjusting the feedback rate and phase, enabling a stable and controlled frequency shift. We experimentally demonstrate reliable and reproducible tuning over 2.1 GHz using a free-space optical setup. Simulations further suggest that this approach could extend the tuning range to tens of GHz, with a potential scan speed exceeding <inline-formula> <tex-math>$10^{17}$ </tex-math></inline-formula> Hz/s. These results highlight dynamic targeting as a promising route toward agile frequency control in semiconductor lasers for photonic integrated circuits.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"378-381"},"PeriodicalIF":2.5,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145830861","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}
Pub Date : 2025-12-10DOI: 10.1109/LPT.2025.3642564
Hao Deng;Xuan Tang;Wanzhen Guo;Jian Zhao
We propose a subband-based nonlinearity compensation algorithm using perturbation theory for bandwidth-constrained faster-than-Nyquist (FTN) systems, and experimentally validate the algorithm in a wavelength-division-multiplexed 32-GBaud/channel dual-polarization 16QAM FTN system over 1200-km single mode fiber. The results show that the proposed method achieves better performance than conventional perturbation-based method and 2-steps/span digital back-propagation, while significantly reducing the complexity. Under this method, the FTN system outperforms traditional Nyquist system in bandwidth-limited scenarios.
{"title":"Experimental Demonstration of WDM DP-16QAM FTN System With Subband-Based Nonlinearity Compensation","authors":"Hao Deng;Xuan Tang;Wanzhen Guo;Jian Zhao","doi":"10.1109/LPT.2025.3642564","DOIUrl":"https://doi.org/10.1109/LPT.2025.3642564","url":null,"abstract":"We propose a subband-based nonlinearity compensation algorithm using perturbation theory for bandwidth-constrained faster-than-Nyquist (FTN) systems, and experimentally validate the algorithm in a wavelength-division-multiplexed 32-GBaud/channel dual-polarization 16QAM FTN system over 1200-km single mode fiber. The results show that the proposed method achieves better performance than conventional perturbation-based method and 2-steps/span digital back-propagation, while significantly reducing the complexity. Under this method, the FTN system outperforms traditional Nyquist system in bandwidth-limited scenarios.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"398-401"},"PeriodicalIF":2.5,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145808577","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}
Dynamic optomechanical systems with multi-frame rotations often suffer beam-axis deviation, which severely degrades performance by reducing coupling efficiency, increasing bit-error rates in free-space optical (FSO) links, impairing target acquisition, and introducing ranging errors. This letter proposes a compensation algorithm using a fast steering mirror (FSM), which integrates a beam-tracing optical model with a multi-frame optomechanical model to explicitly couple FSM control with mechanical motion. The method adaptively corrects optical path deviations in real time. Laboratory tests and dynamic field experiments, including uncrewed aerial vehicle (UAV) tracking, confirmed stable beam pointing: residual misalignment was held within $pm 4~mu rad$ . The results demonstrate that the approach maintains high accuracy with rapid optomechanical frame movements and provides a practical basis for axis calibration in complex Coudé optical systems.
{"title":"Beam-Deviation Compensation of FSM via Beam-Tracing Modeling in Dynamic Optomechanical Systems","authors":"Xu Guo;Yixiong Lin;Diyue Pang;Xiang Li;Yansong Song;Keyan Dong","doi":"10.1109/LPT.2025.3642279","DOIUrl":"https://doi.org/10.1109/LPT.2025.3642279","url":null,"abstract":"Dynamic optomechanical systems with multi-frame rotations often suffer beam-axis deviation, which severely degrades performance by reducing coupling efficiency, increasing bit-error rates in free-space optical (FSO) links, impairing target acquisition, and introducing ranging errors. This letter proposes a compensation algorithm using a fast steering mirror (FSM), which integrates a beam-tracing optical model with a multi-frame optomechanical model to explicitly couple FSM control with mechanical motion. The method adaptively corrects optical path deviations in real time. Laboratory tests and dynamic field experiments, including uncrewed aerial vehicle (UAV) tracking, confirmed stable beam pointing: residual misalignment was held within <inline-formula> <tex-math>$pm 4~mu rad$ </tex-math></inline-formula>. The results demonstrate that the approach maintains high accuracy with rapid optomechanical frame movements and provides a practical basis for axis calibration in complex Coudé optical systems.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"430-433"},"PeriodicalIF":2.5,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145886699","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}
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