{"title":"Photonic Generation of Crossed-Dual-Chirp THz LFM Signal by Single Tunable Laser","authors":"Shenghong Ye;Yiqing Wang;Bo Li;Ryota Kaide;Ming Che;Yuya Mikami;Yuta Ueda;Kazutoshi Kato","doi":"10.1109/LPT.2025.3594261","DOIUrl":null,"url":null,"abstract":"We propose a cost-effective and hardware simplified photonics-based terahertz (THz) linear frequency modulated (LFM) signal generation system. The system utilizes only a single ultra-fast wavelength tunable laser leveraging electro-optic effect combined with commercial fiber self-delay. A crossed-dual-chirp, which consists of simultaneous up-chirp and down-chirp THz LFM signals within the same 400 ns period was generated with a bandwidth of 14.6 GHz and center frequency of 284 GHz. A high chirp rate of 0.0365 GHz/ns was achieved using only a low-cost voltage controller operating at MHz frequency. This cost-effective yet high-performance solution generates crossed-dual-chirp waveforms that are expected to mitigate the Doppler error, making it suitable for high-speed target detection. The proposed system demonstrates significant advantages in practical applications, as it successfully balances performance requirements with implementation complexity.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 22","pages":"1269-1272"},"PeriodicalIF":2.5000,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Photonics Technology Letters","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/11104229/","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
We propose a cost-effective and hardware simplified photonics-based terahertz (THz) linear frequency modulated (LFM) signal generation system. The system utilizes only a single ultra-fast wavelength tunable laser leveraging electro-optic effect combined with commercial fiber self-delay. A crossed-dual-chirp, which consists of simultaneous up-chirp and down-chirp THz LFM signals within the same 400 ns period was generated with a bandwidth of 14.6 GHz and center frequency of 284 GHz. A high chirp rate of 0.0365 GHz/ns was achieved using only a low-cost voltage controller operating at MHz frequency. This cost-effective yet high-performance solution generates crossed-dual-chirp waveforms that are expected to mitigate the Doppler error, making it suitable for high-speed target detection. The proposed system demonstrates significant advantages in practical applications, as it successfully balances performance requirements with implementation complexity.
期刊介绍:
IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.