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IF 2.4 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-15 Epub Date: 2026-03-03 DOI: 10.1109/LPT.2025.3641802
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引用次数: 0
IEEE Photonics Technology Letters publication information IEEE Photonics Technology Letters出版信息
IF 2.4 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-15 Epub Date: 2026-03-03 DOI: 10.1109/LPT.2026.3660553
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引用次数: 0
2025 Index IEEE Photonics Technology Letters 2025索引IEEE光子技术快报
IF 2.5 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-11 DOI: 10.1109/LPT.2026.3664024
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引用次数: 0
Ultrasmall Four-Channel Multiplexer Designed by Bayesian Direct Binary Search Method 基于贝叶斯直接二叉搜索的超小四路复用器设计
IF 2.5 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-10 DOI: 10.1109/LPT.2026.3663414
Yusuke Sawada;Takeshi Fujisawa;Takuya Mitarai;Kento Komatsu;Takuya Okimoto;Takuo Hiratani;Hideki Yagi;Naoki Fujiwara
{"title":"Ultrasmall Four-Channel Multiplexer Designed by Bayesian Direct Binary Search Method","authors":"Yusuke Sawada;Takeshi Fujisawa;Takuya Mitarai;Kento Komatsu;Takuya Okimoto;Takuo Hiratani;Hideki Yagi;Naoki Fujiwara","doi":"10.1109/LPT.2026.3663414","DOIUrl":"https://doi.org/10.1109/LPT.2026.3663414","url":null,"abstract":"We propose two kinds of mosaic-based four-channel multiplexers operating with 20-nm channel spacing in the C- and O-bands, respectively. Mosaic devices feature a complex refractive-index distribution including etched holes. A triangular lattice is introduced to maximize the hole density per area and facilitate fabrication. The hole configurations are optimized using the Bayesian direct binary search method. The multiplexers are the smallest among those validated through experimental demonstration with 20-nm channel spacing. The C-band multiplexer exhibits a low insertion loss of 3 dB and dimensions of <inline-formula> <tex-math>$13.8~mu mathrm{m} times 7.58~mu $ </tex-math></inline-formula>m. Tolerance analyses indicate that spectral shifts caused by waveguide width deviations is 1/10 of that caused by hole diameter deviations. The O-band multiplexer, suitable for coarse wavelength division multiplexing systems, exhibits an insertion loss of 3.6 dB and dimensions of <inline-formula> <tex-math>$12.7~mu mathrm{m} times 7.9~mu $ </tex-math></inline-formula>m. Mosaic devices are a powerful option as ultrasmall passive components for large-scale photonic integrated circuits.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 11","pages":"703-706"},"PeriodicalIF":2.5,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147280903","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
Reconfigurable Narrowband Optical Filter on Thin-Film Lithium Tantalate 薄膜钽酸锂可重构窄带滤光片
IF 2.5 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-10 DOI: 10.1109/LPT.2026.3663254
Jing Huang;Min Sun;Yikai Su;Yong Zhang
{"title":"Reconfigurable Narrowband Optical Filter on Thin-Film Lithium Tantalate","authors":"Jing Huang;Min Sun;Yikai Su;Yong Zhang","doi":"10.1109/LPT.2026.3663254","DOIUrl":"https://doi.org/10.1109/LPT.2026.3663254","url":null,"abstract":"Narrowband optical filters with flexible tunability are key components for integrated reconfigurable wavelength division multiplexing and microwave photonic systems to cope with diverse signals and interference. However, providing reconfigurability while preserving ultra-narrow bandwidth remains challenging. Here we present a Mach-Zehnder interferometer (MZI)-coupled microring filter based on thin-film lithium tantalate (TFLT), showing the ability to control bandwidth, extinction ratio (ER) and resonance wavelength. After electrode integration, the device maintains a minimum bandwidth of 63 MHz. The filter supports continuous bandwidth tuning from 63 MHz to 1.4 GHz and ER control from 0 to 20 dB. In addition, it performs wavelength tuning ability with an efficiency of 1.29 pm/mW, making it suitable for handling interference signals within a wide frequency range. This device is promising for reconfigurable optical communications, dynamic channel management, and on-chip narrowband optical microwave filtering and interference mitigation.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 11","pages":"727-730"},"PeriodicalIF":2.5,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299750","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-Temperature Performance of SiC NPN X-Ray Detector SiC NPN x射线探测器的高温性能
IF 2.5 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-10 DOI: 10.1109/LPT.2026.3663226
Leidang Zhou;Zhuo Chen;Liang Chen;Song Bai;Haozhe Wang;Silong Zhang;Junxiu Liu;Fangbao Wang;Jing Wang;Nan Zhang;Xiaoping Ouyang
{"title":"High-Temperature Performance of SiC NPN X-Ray Detector","authors":"Leidang Zhou;Zhuo Chen;Liang Chen;Song Bai;Haozhe Wang;Silong Zhang;Junxiu Liu;Fangbao Wang;Jing Wang;Nan Zhang;Xiaoping Ouyang","doi":"10.1109/LPT.2026.3663226","DOIUrl":"https://doi.org/10.1109/LPT.2026.3663226","url":null,"abstract":"In this letter, the temperature-dependent X-ray response performance of a two-terminal 4H-SiC npn detector was investigated over the temperature range from 300 K to 500 K. The results indicated a notable reduction in the response current as the temperature increased. Specifically, the sensitivity (<inline-formula> <tex-math>$S$ </tex-math></inline-formula>) dropped by 35.6% to 71.24%, the noise-equivalent dose rate (NED) increased by an order of magnitude, and the internal gain (Gain) decreased by 35.63% to 71.23% at various dose rates from 0.1915 Gy<inline-formula> <tex-math>$cdot $ </tex-math></inline-formula>s−1 to 1.532 Gy<inline-formula> <tex-math>$cdot $ </tex-math></inline-formula>s−1. Tests and analysis using a SiC PIN detector with a depletion region of the same thickness as that of the SiC npn detector revealed that the degradation observed in the SiC npn detector can be attributed to reduced charge collection efficiency related to mobility and lifetime of carriers within the thick depletion region. Additionally, TCAD simulations of the carrier mobility-lifetime product were conducted to illustrate the high-temperature effect on the charge collection efficiency in the <inline-formula> <tex-math>$30~mu $ </tex-math></inline-formula>m depletion region of the SiC npn detector, which is essential for the effective collection of high-energy X-ray photons. This work provided new insight into the feasibility of SiC npn detectors for high-temperature applications.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 10","pages":"675-678"},"PeriodicalIF":2.5,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299721","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
Accurate Prediction of Photon–Photon Resonance Frequency in Passive Feedback DFB Laser 无源反馈DFB激光器中光子-光子共振频率的精确预测
IF 2.5 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-09 DOI: 10.1109/LPT.2026.3662780
Qi Tian;Yu Han;Yuanrong Zhang;Jia Luo;Qingyun Xian;Zhiyuan Zhou;Deming Liu;Shuang Zheng;Changyu Hu;Hao Hu;Zhiheng Quan;Jun Liu;Shengjiang Dai;Minming Zhang
{"title":"Accurate Prediction of Photon–Photon Resonance Frequency in Passive Feedback DFB Laser","authors":"Qi Tian;Yu Han;Yuanrong Zhang;Jia Luo;Qingyun Xian;Zhiyuan Zhou;Deming Liu;Shuang Zheng;Changyu Hu;Hao Hu;Zhiheng Quan;Jun Liu;Shengjiang Dai;Minming Zhang","doi":"10.1109/LPT.2026.3662780","DOIUrl":"https://doi.org/10.1109/LPT.2026.3662780","url":null,"abstract":"Delay-coupled schemes enhance modulation bandwidth in passive feedback DFB (PF-DFB) lasers via photon-photon resonance (PPR) effect. Accurate prediction of PPR frequency is essential for achieving a flat small-signal modulation response and an extended 3-dB modulation bandwidth, though hindered by unmeasurable feedback phase in PF-DFB lasers. Current models estimate feedback phase solely using injection current-induced carrier dispersion, neglecting thermal effects that critically influence phase dynamics. We propose a thermal-coupled model integrating both carrier dispersion and thermal effects for accurate phase prediction. Experiments confirm a root mean squared error (RMSE) of 0.97 GHz between predicted and measured PPR frequencies, achieving a 12.3-fold accuracy improvement over conventional models. This advancement enables more reliable design and optimization of PF-DFB lasers for high-speed optical communication systems.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 10","pages":"663-666"},"PeriodicalIF":2.5,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299723","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
Compact Polarization-Independent 90:10 Power Divider With Wide Bandwidth 紧凑型与偏振无关的90:10宽带宽功率分配器
IF 2.5 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-09 DOI: 10.1109/LPT.2026.3662400
Yicheng Huang;Wufei Zhou;Weiye Hu;Zhuoshen Shi;Xudong Wang;Xinhuan Feng;Jianping Yao
{"title":"Compact Polarization-Independent 90:10 Power Divider With Wide Bandwidth","authors":"Yicheng Huang;Wufei Zhou;Weiye Hu;Zhuoshen Shi;Xudong Wang;Xinhuan Feng;Jianping Yao","doi":"10.1109/LPT.2026.3662400","DOIUrl":"https://doi.org/10.1109/LPT.2026.3662400","url":null,"abstract":"This letter presents an ultra-compact, polarization-insensitive asymmetric (90:10) power splitter based on a modified multimode interference (MMI) structure on a silicon-on-insulator (SOI) platform. The device integrates a unique combination of rectangular and trapezoidal sections within the MMI region, achieving a remarkably small footprint of only <inline-formula> <tex-math>$3.3~mu $ </tex-math></inline-formula>m <inline-formula> <tex-math>$times 5~mu $ </tex-math></inline-formula>m. Experimental results demonstrate that the splitter successfully operates over a 100-nm bandwidth (1500-1600 nm), supporting both transverse electric (TE) and transverse magnetic (TM) modes with minimal performance variation. The measured excess loss (EL) remains below 1 dB for the TE mode and below 1.8 dB for the TM mode, while maintaining the target 90:10 splitting ratio. Furthermore, the splitting ratio is highly tunable from 60:40 to 90:10 by simply adjusting the length of the rectangular section, showcasing the versatility the design. This work provides a high-performance solution for applications requiring compact and polarization-independent power splitting in densely integrated photonic circuits.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 10","pages":"671-674"},"PeriodicalIF":2.5,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299747","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
Extrinsic Dual-Beam Triggering for Enhanced Photoconductivity in GaAs PCSS 外源双光束触发增强GaAs PCSS的光导电性
IF 2.5 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-06 DOI: 10.1109/LPT.2026.3661981
Chun Liu;Ming Xu;Shengtao Chen;Ruidong Lv;Li Sun;Kun Qu;Mi Pang
{"title":"Extrinsic Dual-Beam Triggering for Enhanced Photoconductivity in GaAs PCSS","authors":"Chun Liu;Ming Xu;Shengtao Chen;Ruidong Lv;Li Sun;Kun Qu;Mi Pang","doi":"10.1109/LPT.2026.3661981","DOIUrl":"https://doi.org/10.1109/LPT.2026.3661981","url":null,"abstract":"The limited utilization efficiency of extrinsic triggering remains a major constraint on the performance of GaAs photoconductive semiconductor switches (PCSS). In this work, the transient output characteristics of a single opposed-contact GaAs PCSS under extrinsic dual-beam synchronous triggering are investigated, assuming uniform optical energy splitting. Measurements within the 2-3.5 kV bias range indicate that dual-beam triggering effectively enhances the output pulse amplitude compared with single-beam triggering. Specifically, at a bias voltage of 3 kV, the amplitude reaches approximately 2.73-fold that of the single-beam case. Simulated spatial distributions of photogeneration rate and current density further reveal the underlying mechanism of enhanced photoconductivity with dual-beam triggering. These results offer valuable insights into optimizing the triggering strategy to enhance the efficiency and performance of GaAs PCSS under extrinsic triggering.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 10","pages":"639-642"},"PeriodicalIF":2.5,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146211311","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
Enhanced Extinction Ratio in QKD Transmitters Using On-Chip Saturable Absorbers 利用片上饱和吸收剂增强QKD发射机的消光比
IF 2.5 3区 工程技术
IEEE Photonics Technology Letters Pub Date : 2026-02-06 DOI: 10.1109/LPT.2026.3661870
Julian Konig;Ozan Çirkinoğlu;Rajib R. Ghosh;Martijn J. R. Heck;Xaveer J. M. Leijtens
{"title":"Enhanced Extinction Ratio in QKD Transmitters Using On-Chip Saturable Absorbers","authors":"Julian Konig;Ozan Çirkinoğlu;Rajib R. Ghosh;Martijn J. R. Heck;Xaveer J. M. Leijtens","doi":"10.1109/LPT.2026.3661870","DOIUrl":"https://doi.org/10.1109/LPT.2026.3661870","url":null,"abstract":"We demonstrate an integrated quantum key distribution (QKD) transmitter with enhanced extinction ratio (ER) using a monolithically integrated saturable absorber (SA). Since the light is later attenuated to the weak-coherent-state level, the additional signal loss in the SA does not impair performance. The SA improves the ER by 3.6 dB at 1 GHz, corresponding to an estimated ~50% relative reduction in quantum bit error rate and a ~17% increase in secret key rate, offering a compact, low-complexity route to improved secure key rates in practical QKD systems.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"38 10","pages":"659-662"},"PeriodicalIF":2.5,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11373232","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299748","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
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