Pub Date : 2026-01-28DOI: 10.1109/LPT.2026.3658450
Hamza Asif Khan;Yang Jiang
Metasurfaces have attracted significant attention due to their powerful capabilities to control the characteristics of electromagnetic (EM) waves flexibly and rapidly. Despite much effort to enhance their performance, metasurfaces remain constrained in optical transparency, flexibility and operating bandwidth. Herein, we have design a flexible metasurface that is capable of operating over an ultrawideband frequency range of 86% with an optical-transparency up to 65.29%. First, a cross-polarization converter (CPC) is design that converts the linearly polarized incident EM wave into its orthogonal component ranging from 14.5 to 36.5 GHz. Moreover, the underlying mechanisms of CPC is analyzed in detail. Next, utilizing Pancharatnam-Berry (PB) phase principle, meta-atom “1” is formed and the layout of the coding metasurface is obtained through genetic algorithm (GA) for radar cross section (RCS) reduction. According to the simulation results, the proposed metasurface can achieve more than 15 dB RCS reduction in the frequency range of 15.4 to 34.3 GHz. Additionally, the RCS reduction performance is evaluated on curved surfaces, demonstrating stable behavior even at a central bending angle of $pi $ . Experimental results show good agreement with simulations, validating the effectiveness of the proposed design. Owing to its transparency, flexibility, and broadband characteristics, the proposed metasurface yields promising potential in multifunctional stealth applications.
{"title":"Broadband 15-dB RCS Reduction Optimized Coding Metasurface Based on Flexible Polarization Converter","authors":"Hamza Asif Khan;Yang Jiang","doi":"10.1109/LPT.2026.3658450","DOIUrl":"https://doi.org/10.1109/LPT.2026.3658450","url":null,"abstract":"Metasurfaces have attracted significant attention due to their powerful capabilities to control the characteristics of electromagnetic (EM) waves flexibly and rapidly. Despite much effort to enhance their performance, metasurfaces remain constrained in optical transparency, flexibility and operating bandwidth. Herein, we have design a flexible metasurface that is capable of operating over an ultrawideband frequency range of 86% with an optical-transparency up to 65.29%. First, a cross-polarization converter (CPC) is design that converts the linearly polarized incident EM wave into its orthogonal component ranging from 14.5 to 36.5 GHz. Moreover, the underlying mechanisms of CPC is analyzed in detail. Next, utilizing Pancharatnam-Berry (PB) phase principle, meta-atom “1” is formed and the layout of the coding metasurface is obtained through genetic algorithm (GA) for radar cross section (RCS) reduction. According to the simulation results, the proposed metasurface can achieve more than 15 dB RCS reduction in the frequency range of 15.4 to 34.3 GHz. Additionally, the RCS reduction performance is evaluated on curved surfaces, demonstrating stable behavior even at a central bending angle of <inline-formula> <tex-math>$pi $ </tex-math></inline-formula>. Experimental results show good agreement with simulations, validating the effectiveness of the proposed design. Owing to its transparency, flexibility, and broadband characteristics, the proposed metasurface yields promising potential in multifunctional stealth applications.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 10","pages":"643-646"},"PeriodicalIF":2.5,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146211312","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}
A $640times 512$ focal plane array for long-wave infrared detection is demonstrated based on the type-II InAs/GaSb superlattice and P$pi $ MN device structure. At 77 K, the 50% cutoff wavelength is $10.8~mu $ m; under a reverse bias of ~50 mV, the dark current density of single-element detector with mesa size of $25~mu $ m is measured as $8.3times 10 ^{-5}$ A/cm2. With an integration time of 0.5 ms and an f/2.0 aperture, a focal plane array operating at 77K exhibits a mean noise equivalent temperature difference (NETD) of 18.52 mK and a pixel operability of 99.8%.
基于ii型InAs/GaSb超晶格和P $pi $ MN器件结构，设计了一种用于长波红外探测的$640times 512$焦平面阵列。77公里，50英里% cutoff wavelength is $10.8~mu $ m; under a reverse bias of ~50 mV, the dark current density of single-element detector with mesa size of $25~mu $ m is measured as $8.3times 10 ^{-5}$ A/cm2. With an integration time of 0.5 ms and an f/2.0 aperture, a focal plane array operating at 77K exhibits a mean noise equivalent temperature difference (NETD) of 18.52 mK and a pixel operability of 99.8%.
{"title":"Fabrication of 640 × 512/25 μm LWIR Focal Plane Array Based on InAs/GaSb Superlattice","authors":"Junbin Li;Peifeng Zhang;Longhua Chen;Zhe Zhang;Li Zhang;Wei Wang;Ying Su;Jiankai Xue;Xurui Peng;Haiyan Shi;Zichen Zhang","doi":"10.1109/LPT.2026.3658437","DOIUrl":"https://doi.org/10.1109/LPT.2026.3658437","url":null,"abstract":"A <inline-formula> <tex-math>$640times 512$ </tex-math></inline-formula> focal plane array for long-wave infrared detection is demonstrated based on the type-II InAs/GaSb superlattice and P<inline-formula> <tex-math>$pi $ </tex-math></inline-formula>MN device structure. At 77 K, the 50% cutoff wavelength is <inline-formula> <tex-math>$10.8~mu $ </tex-math></inline-formula>m; under a reverse bias of ~50 mV, the dark current density of single-element detector with mesa size of <inline-formula> <tex-math>$25~mu $ </tex-math></inline-formula>m is measured as <inline-formula> <tex-math>$8.3times 10 ^{-5}$ </tex-math></inline-formula> A/cm2. With an integration time of 0.5 ms and an f/2.0 aperture, a focal plane array operating at 77K exhibits a mean noise equivalent temperature difference (NETD) of 18.52 mK and a pixel operability of 99.8%.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 10","pages":"631-634"},"PeriodicalIF":2.5,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146211295","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}
In this letter, we present an efficient quasi-cyclic low-density parity-check (QC-LDPC) decoder designed for resource-constrained satellite laser communication terminals. We propose a novel approximate min-sum algorithm that incorporates node grouping and hierarchical comparison, reducing comparator and multiplexer (MUX) usage by 39% and 52%, respectively, with only a negligible 0.02 dB performance degradation. To maximize hardware efficiency, we propose a multi-frame parallel architecture with asynchronous scheduling, achieving near-optimal 99.8% on-chip block RAM (BRAM) utilization and eliminating pipeline stalls. Experimental results demonstrate that the proposed decoder supports 2 Gbps binary phase-shift keying (BPSK) transmission with a minimum required received optical power (ROP) of –53 dBm.
{"title":"Hierarchical Approximate Min-Sum and Multi-Frame Parallel QC-LDPC Decoder for FPGA Optical Links","authors":"Qianwu Zhang;Kun Chen;Yuanzhe Qu;Decai Liu;Junjie Zhang;Yingxiong Song;Zhe Zheng","doi":"10.1109/LPT.2026.3656933","DOIUrl":"https://doi.org/10.1109/LPT.2026.3656933","url":null,"abstract":"In this letter, we present an efficient quasi-cyclic low-density parity-check (QC-LDPC) decoder designed for resource-constrained satellite laser communication terminals. We propose a novel approximate min-sum algorithm that incorporates node grouping and hierarchical comparison, reducing comparator and multiplexer (MUX) usage by 39% and 52%, respectively, with only a negligible 0.02 dB performance degradation. To maximize hardware efficiency, we propose a multi-frame parallel architecture with asynchronous scheduling, achieving near-optimal 99.8% on-chip block RAM (BRAM) utilization and eliminating pipeline stalls. Experimental results demonstrate that the proposed decoder supports 2 Gbps binary phase-shift keying (BPSK) transmission with a minimum required received optical power (ROP) of –53 dBm.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 10","pages":"635-638"},"PeriodicalIF":2.5,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146211300","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 work first establishes an 8-channel four pulse amplitude modulation (PAM-4) intensity modulation direct detection (IM-DD) optoelectronic transceiver system, with cascaded silicon Mach-Zehnder interferometer (MZI) lattice-filter technology, for high-speed and long reach (LR) (over 10 km) transmission scenario of modern data center interconnection (DCI). The compact silicon photonic (SiPh) traveling wave Mach-Zehnder modulators (TW-MZM) and silicon-germanium (SiGe) photodetectors (PD) (bandwidth > 49.5 GHz with a responsivity > 0.8 A/W) are homogeneously integrated with MZI lattice-filter based $8times 1$ multiplexer (MUX) and $1times 8$ demultiplexer (DeMUX), respectively, endowing the system with compact structure and tunable operating wavelengths. Finally, the novel SiPh transceiver system is elaborately integrated and applied into the local area network wavelength division multiplexing (LAN-WDM) LR8 circumstance, transmitting over 10 km standard single mode fiber (SSMF), with broad bandwidth (> 33 GHz), good channel response uniformity, and supports over 100 Gbps per lane for high-speed transmission, featuring proper system bit error rate (BER) performance in compliance with IEEE 802.3 standards.
{"title":"Lattice-Filter-Based LAN-WDM Silicon Photonic Transceiver System for DCI LR8 Application","authors":"Xiaojun Ying;Penghui Xia;Ruiqi Luo;Huaqing Jiang;Heng Chen;Kun Yin;Hui Yu;Dan Lu;Tao Chu;Chen Ji","doi":"10.1109/LPT.2026.3655436","DOIUrl":"https://doi.org/10.1109/LPT.2026.3655436","url":null,"abstract":"This work first establishes an 8-channel four pulse amplitude modulation (PAM-4) intensity modulation direct detection (IM-DD) optoelectronic transceiver system, with cascaded silicon Mach-Zehnder interferometer (MZI) lattice-filter technology, for high-speed and long reach (LR) (over 10 km) transmission scenario of modern data center interconnection (DCI). The compact silicon photonic (SiPh) traveling wave Mach-Zehnder modulators (TW-MZM) and silicon-germanium (SiGe) photodetectors (PD) (bandwidth > 49.5 GHz with a responsivity > 0.8 A/W) are homogeneously integrated with MZI lattice-filter based <inline-formula> <tex-math>$8times 1$ </tex-math></inline-formula>multiplexer (MUX) and <inline-formula> <tex-math>$1times 8$ </tex-math></inline-formula> demultiplexer (DeMUX), respectively, endowing the system with compact structure and tunable operating wavelengths. Finally, the novel SiPh transceiver system is elaborately integrated and applied into the local area network wavelength division multiplexing (LAN-WDM) LR8 circumstance, transmitting over 10 km standard single mode fiber (SSMF), with broad bandwidth (> 33 GHz), good channel response uniformity, and supports over 100 Gbps per lane for high-speed transmission, featuring proper system bit error rate (BER) performance in compliance with IEEE 802.3 standards.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 8","pages":"535-538"},"PeriodicalIF":2.5,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082280","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 : 2026-01-19DOI: 10.1109/LPT.2026.3655588
Marco Moller de Freitas;Xiaofeng Zhu;Md. Ifaz Isti;Joshua Arnold;Ruidong Xue;Jiuyi Zhang;Peng Yao;Timothy Creazzo;Christopher Cullen;Shouyuan Shi;Dennis W. Prather
Thin-film lithium niobate (TFLN) electro-optic modulators have been widely explored at 1550 nm, achieving ultra-low driving voltages, broad bandwidths, and compact footprints. Yet, development at 1064 nm has remained comparatively limited, despite its growing importance for applications that demand high power and cost-effective integration with CMOS-compatible silicon photodetectors such as free-space optics, frequency combs and biophotonics. In this work, we demonstrate a high-efficiency TFLN modulator operating at 1064 nm contributing to fulfilling this gap. The device employs a 1 cm-long interaction region with capacitively loaded traveling-wave electrodes designed to minimize the velocity mismatch between RF and optical modes, achieving an index mismatch as low as 0.05. This careful optimization enables a high frequency half-wave voltage of 1.45 V and a 40 GHz 3-dB bandwidth, representing the best performance reported to date for 1064 nm operation. These results highlight the potential of TFLN modulators to extend beyond traditional telecom wavelengths leveraging lower V$pi $ , high quality lasers and easy integration with Si photodetectors.
{"title":"TFLN MZM Operating at 1-μm Wavelength With Low Vπ and High Bandwidth","authors":"Marco Moller de Freitas;Xiaofeng Zhu;Md. Ifaz Isti;Joshua Arnold;Ruidong Xue;Jiuyi Zhang;Peng Yao;Timothy Creazzo;Christopher Cullen;Shouyuan Shi;Dennis W. Prather","doi":"10.1109/LPT.2026.3655588","DOIUrl":"https://doi.org/10.1109/LPT.2026.3655588","url":null,"abstract":"Thin-film lithium niobate (TFLN) electro-optic modulators have been widely explored at 1550 nm, achieving ultra-low driving voltages, broad bandwidths, and compact footprints. Yet, development at 1064 nm has remained comparatively limited, despite its growing importance for applications that demand high power and cost-effective integration with CMOS-compatible silicon photodetectors such as free-space optics, frequency combs and biophotonics. In this work, we demonstrate a high-efficiency TFLN modulator operating at 1064 nm contributing to fulfilling this gap. The device employs a 1 cm-long interaction region with capacitively loaded traveling-wave electrodes designed to minimize the velocity mismatch between RF and optical modes, achieving an index mismatch as low as 0.05. This careful optimization enables a high frequency half-wave voltage of 1.45 V and a 40 GHz 3-dB bandwidth, representing the best performance reported to date for 1064 nm operation. These results highlight the potential of TFLN modulators to extend beyond traditional telecom wavelengths leveraging lower V<inline-formula> <tex-math>$pi $ </tex-math></inline-formula>, high quality lasers and easy integration with Si photodetectors.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 8","pages":"555-558"},"PeriodicalIF":2.5,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11357954","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082279","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 : 2026-01-19DOI: 10.1109/LPT.2026.3655104
Siyu Bai;Zehua Xu;Chengshang Lyu;Yibin Li;Qian Li;H. Y. Fu
We propose and experimentally demonstrate a novel frequency–temporal enhanced recovery (FTER) framework to mitigate quantization distortion in ultra-low-resolution (3-5-bit) asymmetrically clipped optical OFDM (ACO-OFDM) optical wireless communication (OWC) links. The FTER scheme combines frequency-domain feature extraction with a temporal convolutional network (TCN)-based denoiser to effectively recover signals suffering from severe quantization noise. In our 1-m OWC experiment with a 680 nm vertical-cavity surface-emitting laser (VCSEL) transmitter, FTER first extracts a rich set of primary and higher-order spectral features from the quantized received signal and employs a random forest to select the most informative features. These features are then fed into a dilated TCN, which learns to suppress structured quantization artifacts and restore the signal. Experimental results confirm that the proposed method enables reliable 32-QAM and 64-QAM transmissions at baud rates up to 0.625 GBaud and 0.75 GBaud, respectively, achieving bit-error rates (BERs) below the hard-decision forward error correction (HD-FEC) threshold. Specifically, under 4-bit quantization with 64-QAM at 0.75 GBaud, the proposed FTER scheme improves the BER from $mathbf {7}.mathbf {2}mathrm {times }{mathbf {10}}^{-mathbf {3}}$ to $mathbf {3}.mathbf {7}mathrm {times }{mathbf {10}}^{-mathbf {3}}$ . These findings demonstrate the feasibility of deploying compact, low-cost OWC links.
{"title":"Frequency-Temporal Enhanced Recovery for Ultra-Low-Resolution ACO-OFDM OWC Links","authors":"Siyu Bai;Zehua Xu;Chengshang Lyu;Yibin Li;Qian Li;H. Y. Fu","doi":"10.1109/LPT.2026.3655104","DOIUrl":"https://doi.org/10.1109/LPT.2026.3655104","url":null,"abstract":"We propose and experimentally demonstrate a novel frequency–temporal enhanced recovery (FTER) framework to mitigate quantization distortion in ultra-low-resolution (3-5-bit) asymmetrically clipped optical OFDM (ACO-OFDM) optical wireless communication (OWC) links. The FTER scheme combines frequency-domain feature extraction with a temporal convolutional network (TCN)-based denoiser to effectively recover signals suffering from severe quantization noise. In our 1-m OWC experiment with a 680 nm vertical-cavity surface-emitting laser (VCSEL) transmitter, FTER first extracts a rich set of primary and higher-order spectral features from the quantized received signal and employs a random forest to select the most informative features. These features are then fed into a dilated TCN, which learns to suppress structured quantization artifacts and restore the signal. Experimental results confirm that the proposed method enables reliable 32-QAM and 64-QAM transmissions at baud rates up to 0.625 GBaud and 0.75 GBaud, respectively, achieving bit-error rates (BERs) below the hard-decision forward error correction (HD-FEC) threshold. Specifically, under 4-bit quantization with 64-QAM at 0.75 GBaud, the proposed FTER scheme improves the BER from <inline-formula> <tex-math>$mathbf {7}.mathbf {2}mathrm {times }{mathbf {10}}^{-mathbf {3}}$ </tex-math></inline-formula> to <inline-formula> <tex-math>$mathbf {3}.mathbf {7}mathrm {times }{mathbf {10}}^{-mathbf {3}}$ </tex-math></inline-formula>. These findings demonstrate the feasibility of deploying compact, low-cost OWC links.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 9","pages":"567-570"},"PeriodicalIF":2.5,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146139115","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 : 2026-01-19DOI: 10.1109/LPT.2026.3655069
Manuel Peralta-Fuentes;Florencia Almonacid;Eduardo F. Fernández
High-Intensity Wireless Laser Power Transmission (WLPT) is emerging as a ground-breaking technology with a wide range of promising applications, such as space exploration missions. While conventional photovoltaic devices primarily rely on GaAs-based converters, they present significant efficiency losses under high-intensity scenarios. This work explores the potential of novel wide-bandgap semiconductors, specifically SiCs and InGaN, to outperform traditional technologies. We conduct a comprehensive theoretical analysis of these materials as laser power converters across planetary atmospheres of the Solar System. Results indicate that InGaN and SiC-based converters could achieve efficiencies exceeding 75% in high potential candidates, with very tenuous atmospheres, such as the Moon or Mercury. For planets and satellites with Earth-like atmospheres, the efficiencies of these materials could be beyond 50%. In all cases, the novel, wide bandgap materials seem to outperform GaAs. These results highlight the suitability of wide-bandgap materials for WLPT paving the way for reliable and continuous in future and space exploration missions.
{"title":"Wide-Bandgap Materials for High-Intensity Wireless Laser Power Transmission in the Solar System","authors":"Manuel Peralta-Fuentes;Florencia Almonacid;Eduardo F. Fernández","doi":"10.1109/LPT.2026.3655069","DOIUrl":"https://doi.org/10.1109/LPT.2026.3655069","url":null,"abstract":"High-Intensity Wireless Laser Power Transmission (WLPT) is emerging as a ground-breaking technology with a wide range of promising applications, such as space exploration missions. While conventional photovoltaic devices primarily rely on GaAs-based converters, they present significant efficiency losses under high-intensity scenarios. This work explores the potential of novel wide-bandgap semiconductors, specifically SiCs and InGaN, to outperform traditional technologies. We conduct a comprehensive theoretical analysis of these materials as laser power converters across planetary atmospheres of the Solar System. Results indicate that InGaN and SiC-based converters could achieve efficiencies exceeding 75% in high potential candidates, with very tenuous atmospheres, such as the Moon or Mercury. For planets and satellites with Earth-like atmospheres, the efficiencies of these materials could be beyond 50%. In all cases, the novel, wide bandgap materials seem to outperform GaAs. These results highlight the suitability of wide-bandgap materials for WLPT paving the way for reliable and continuous in future and space exploration missions.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 8","pages":"559-561"},"PeriodicalIF":2.5,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11357938","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175933","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}
We report a highly efficient, Nd-doped all-fiber laser operating based on the three-level transition at 915 nm. A key feature of the laser is a novel active fiber with cladding-embedded absorbing rods that suppress parasitic amplified spontaneous emission (ASE) at 1060 nm. The laser demonstrates 37% slope efficiency, which is, to the best of our knowledge, the highest reported value among all-fiber lasers with near-diffraction-limited beam quality (M${}^{2} lt 1.2$ ). Strong ASE suppression with a signal-to-ASE ratio exceeding 50 dB was achieved. Further output power and efficiency scaling can be reached by optimization of fiber components used in the laser cavity.
{"title":"Monolithic Single-Mode Nd-Doped Fiber Laser Operated at 915-nm With 37% Slope Efficiency","authors":"Danila Davydov;Svetlana Aleshkina;Vladimir Velmiskin;Alexey Lobanov;Mikhail Yashkov;Denis Lipatov;Dmitry Przhiialkovskii;Oleg Butov;Mikhail Likhachev","doi":"10.1109/LPT.2026.3654345","DOIUrl":"https://doi.org/10.1109/LPT.2026.3654345","url":null,"abstract":"We report a highly efficient, Nd-doped all-fiber laser operating based on the three-level transition at 915 nm. A key feature of the laser is a novel active fiber with cladding-embedded absorbing rods that suppress parasitic amplified spontaneous emission (ASE) at 1060 nm. The laser demonstrates 37% slope efficiency, which is, to the best of our knowledge, the highest reported value among all-fiber lasers with near-diffraction-limited beam quality (M<inline-formula> <tex-math>${}^{2} lt 1.2$ </tex-math></inline-formula>). Strong ASE suppression with a signal-to-ASE ratio exceeding 50 dB was achieved. Further output power and efficiency scaling can be reached by optimization of fiber components used in the laser cavity.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 8","pages":"543-546"},"PeriodicalIF":2.5,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082236","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 : 2026-01-12DOI: 10.1109/LPT.2026.3651605
Yazheng Hao;Shuo Zhang;He Su;Rui Yang
We investigate the linear and nonlinear optical responses of a dielectric metasurface exhibiting electromagnetically induced transparency based on bound states in the continuum (BIC) in the near-infrared region. The metasurface is composed of periodically arranged silicon square ring resonators on the top of the SiO2 substrate, with an embedded silicon coupling stripe within each unit cell to break in-plane structural symmetry and facilitate quasi-BIC excitation. Under normal incidence, the proposed design achieves a maximum figure of merit of $2.39times 10^{4}$ , demonstrating an ultrahigh-$Q$ resonance. Additionally, the metasurface supports efficient third harmonic generation effectively with the maximum conversion efficiency of 6.95%. These results provide a promising platform for the applications in high-$Q$ photonics and advanced nonlinear optical devices.
{"title":"Enhancing Linear and Nonlinear Transparent Responses in Stripe-Coupled Metasurface via BIC","authors":"Yazheng Hao;Shuo Zhang;He Su;Rui Yang","doi":"10.1109/LPT.2026.3651605","DOIUrl":"https://doi.org/10.1109/LPT.2026.3651605","url":null,"abstract":"We investigate the linear and nonlinear optical responses of a dielectric metasurface exhibiting electromagnetically induced transparency based on bound states in the continuum (BIC) in the near-infrared region. The metasurface is composed of periodically arranged silicon square ring resonators on the top of the SiO2 substrate, with an embedded silicon coupling stripe within each unit cell to break in-plane structural symmetry and facilitate quasi-BIC excitation. Under normal incidence, the proposed design achieves a maximum figure of merit of <inline-formula> <tex-math>$2.39times 10^{4}$ </tex-math></inline-formula>, demonstrating an ultrahigh-<inline-formula> <tex-math>$Q$ </tex-math></inline-formula> resonance. Additionally, the metasurface supports efficient third harmonic generation effectively with the maximum conversion efficiency of 6.95%. These results provide a promising platform for the applications in high-<inline-formula> <tex-math>$Q$ </tex-math></inline-formula> photonics and advanced nonlinear optical devices.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 7","pages":"499-502"},"PeriodicalIF":2.5,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026634","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 : 2026-01-12DOI: 10.1109/LPT.2026.3653008
Xiao Zhang;Xiaolong Fu;Shuna Yang;Bo Yang;Yiran Gao;Hao Chi
This Letter proposes a novel photonic approach for simultaneous angle-of-arrival (AOA) and frequency measurement based on time stretch. The system employs a dual-polarization single-sideband modulation structure implemented via a DP-BPSK modulator to effectively suppress dispersion-induced fading and enable orthogonal polarization multiplexing. A programmable optical filter is used to ensure spectral uniformity and prevent temporal overlap. After polarization beam splitting and photodetection, stretched waveforms are digitized using low-speed ADCs to extract both AOA and frequency. Experiments for simultaneous measurement of frequency and AOA are demonstrated, within a frequency range of 3–30 GHz and an AOA range of ±70.8°, confirming the system’s capability for wideband RF sensing with relaxed electronic bandwidth requirements.
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