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}
Pub Date : 2025-12-09DOI: 10.1109/LPT.2025.3641974
Fuwang Wu;Xiang He;Hongtao Wei;Zhengkai Yao;Yi Wan;Weiye Song
To address the challenge of severe dispersion in visible light optical coherence tomography (vis-OCT), this letter proposes a simple yet effective digital dispersion compensation method based on phase modeling of optical components (PMOC). The PMOC can effectively compensate for higher-order dispersion without requiring complex computations or additional mirror-reflection measurements. It is also capable of compensating for spatially dependent dispersion (SDD). The performance of the method is validated through both interference signal analysis and vis-OCT images. Moreover, compared to the Taylor series iterative fitting (TSIF) method, the proposed method achieved a significant improvement in resolution and signal-to-noise ratio (SNR). The images obtained by PMOC are comparable to those acquired under dispersion-free conditions.
{"title":"Phase Modeling of Optical Components for Dispersion Compensation in Visible Light OCT","authors":"Fuwang Wu;Xiang He;Hongtao Wei;Zhengkai Yao;Yi Wan;Weiye Song","doi":"10.1109/LPT.2025.3641974","DOIUrl":"https://doi.org/10.1109/LPT.2025.3641974","url":null,"abstract":"To address the challenge of severe dispersion in visible light optical coherence tomography (vis-OCT), this letter proposes a simple yet effective digital dispersion compensation method based on phase modeling of optical components (PMOC). The PMOC can effectively compensate for higher-order dispersion without requiring complex computations or additional mirror-reflection measurements. It is also capable of compensating for spatially dependent dispersion (SDD). The performance of the method is validated through both interference signal analysis and vis-OCT images. Moreover, compared to the Taylor series iterative fitting (TSIF) method, the proposed method achieved a significant improvement in resolution and signal-to-noise ratio (SNR). The images obtained by PMOC are comparable to those acquired under dispersion-free conditions.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 5","pages":"353-356"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145830924","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 : 2025-12-09DOI: 10.1109/LPT.2025.3642138
Sanlu Yi;Yigong Yang;Yu Huang;Pei Zhou;Kuenyao Lau;Nianqiang Li
This study presents an edge detection paradigm implemented on a photonic spiking neuron chip that emulates retinal ganglion cells’ spatiotemporal processing through an integrated distributed feedback laser with a saturable absorber (DFB-SA). According to the chip architecture, the time-to-first-spike encoding scheme is employed to convert pixel data collected from the receptive field (RF) into spatiotemporal spike patterns suitable for processing. Systematic experimental characterizations and numerical simulations with both binary and natural images demonstrate the system’s capability to perform biological plausibility in edge feature extraction. These results establish a pathway for a scalable photon spike network that combines biological plausibility with ultra-low power computing.
{"title":"Experimental Demonstration of Image Edge Detection Using a Photonic Spiking DFB-SA Neuron","authors":"Sanlu Yi;Yigong Yang;Yu Huang;Pei Zhou;Kuenyao Lau;Nianqiang Li","doi":"10.1109/LPT.2025.3642138","DOIUrl":"https://doi.org/10.1109/LPT.2025.3642138","url":null,"abstract":"This study presents an edge detection paradigm implemented on a photonic spiking neuron chip that emulates retinal ganglion cells’ spatiotemporal processing through an integrated distributed feedback laser with a saturable absorber (DFB-SA). According to the chip architecture, the time-to-first-spike encoding scheme is employed to convert pixel data collected from the receptive field (RF) into spatiotemporal spike patterns suitable for processing. Systematic experimental characterizations and numerical simulations with both binary and natural images demonstrate the system’s capability to perform biological plausibility in edge feature extraction. These results establish a pathway for a scalable photon spike network that combines biological plausibility with ultra-low power computing.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"361-364"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145886696","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 : 2025-12-09DOI: 10.1109/LPT.2025.3642193
Mandeep Jangra;Yogesh Khatri;Arnab Datta
A forward machine learning (ML) model-based fabrication of dielectric etalon has been demonstrated here for the control of accurate colors represented by their H-S-V, i.e., hue (H), saturation (S) and value (V). ML models [random forest (RF), gradient boosting (GB), multi-layer perceptron (MLP), and K-neighbors (KNR)] were trained involving large dataset (~148000) that represent reflectance spectra obtained from a germanium-antimony-telluride (GST)/silicon dioxide (SiO2)/p-silicon (p-Si)-based dielectric etalon through calibrated transfer matrix method (TMM)-based numerical simulations for different thicknesses and phases of the GST and SiO2, incidence angles and polarization states of the input. The RF model was found to achieve ~0.998 coefficient of determination (R2), minimum mean absolute error (MSE) and root mean squared error (RMSE) while directly predicting different color channels (R, G and B), which was further employed for desired experimental color demonstration (H, S, and V) via fabricated dielectric etalon. Latter was fabricated based on optimized ML model-led accurate geometric and physical parameters.
{"title":"Reliable Prediction of H-S-V of Colors for Dielectric Etalon via Forward ML Model","authors":"Mandeep Jangra;Yogesh Khatri;Arnab Datta","doi":"10.1109/LPT.2025.3642193","DOIUrl":"https://doi.org/10.1109/LPT.2025.3642193","url":null,"abstract":"A forward machine learning (ML) model-based fabrication of dielectric etalon has been demonstrated here for the control of accurate colors represented by their H-S-V, i.e., hue (H), saturation (S) and value (V). ML models [random forest (RF), gradient boosting (GB), multi-layer perceptron (MLP), and K-neighbors (KNR)] were trained involving large dataset (~148000) that represent reflectance spectra obtained from a germanium-antimony-telluride (GST)/silicon dioxide (SiO2)/p-silicon (p-Si)-based dielectric etalon through calibrated transfer matrix method (TMM)-based numerical simulations for different thicknesses and phases of the GST and SiO2, incidence angles and polarization states of the input. The RF model was found to achieve ~0.998 coefficient of determination (R2), minimum mean absolute error (MSE) and root mean squared error (RMSE) while directly predicting different color channels (R, G and B), which was further employed for desired experimental color demonstration (H, S, and V) via fabricated dielectric etalon. Latter was fabricated based on optimized ML model-led accurate geometric and physical parameters.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 5","pages":"357-360"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145830925","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 : 2025-12-09DOI: 10.1109/LPT.2025.3641929
Zhenyu Chen;Jiameng Dong;Zhaohui Wang;Qingwei Liu;Rui Zhang;Song Yu;Bin Luo
Fiber-optic interferometers are widely used in phase modulation (PM) time transfer systems. To achieve stable phase demodulation, resisting the phase drift within the interferometer is essential. Moreover, using lithium niobate phase modulator in the interferometer inevitably introduces residual intensity modulation (RIM) due to its inherent imperfections. A stable phase control method based on optical power detection is proposed to resist phase drift and concomitantly suppress RIM. Furthermore, the characteristics of phase control at the extremum point (EP) and near-extremum point (NEP) of the interferometric response curve are analyzed and compared. Analysis shows that EP control offers lower demodulation stability but higher sensitivity to intensity fluctuations than NEP control. A fiber-optic time transfer experiment validates the applicability and effectiveness of the proposed method and confirms the analysis. The proposed method enhances the interferometer’s demodulation stability and shows good application prospects in phase signal detection.
{"title":"A Phase Control Method With RIM Suppression for PM Fiber-Optic Time Transfer System","authors":"Zhenyu Chen;Jiameng Dong;Zhaohui Wang;Qingwei Liu;Rui Zhang;Song Yu;Bin Luo","doi":"10.1109/LPT.2025.3641929","DOIUrl":"https://doi.org/10.1109/LPT.2025.3641929","url":null,"abstract":"Fiber-optic interferometers are widely used in phase modulation (PM) time transfer systems. To achieve stable phase demodulation, resisting the phase drift within the interferometer is essential. Moreover, using lithium niobate phase modulator in the interferometer inevitably introduces residual intensity modulation (RIM) due to its inherent imperfections. A stable phase control method based on optical power detection is proposed to resist phase drift and concomitantly suppress RIM. Furthermore, the characteristics of phase control at the extremum point (EP) and near-extremum point (NEP) of the interferometric response curve are analyzed and compared. Analysis shows that EP control offers lower demodulation stability but higher sensitivity to intensity fluctuations than NEP control. A fiber-optic time transfer experiment validates the applicability and effectiveness of the proposed method and confirms the analysis. The proposed method enhances the interferometer’s demodulation stability and shows good application prospects in phase signal detection.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 6","pages":"370-373"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145830939","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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