{"title":"直接调制半导体激光器中一周期动态产生带宽增强LFM信号。","authors":"Gengze Wu, Fangzheng Zhang, Xiaoyue Yu, Xin Yan, Hao Wang, Yuan Yu, Shilong Pan","doi":"10.1364/OL.559656","DOIUrl":null,"url":null,"abstract":"<p><p>Period-one (P1) laser dynamics provide effective methods for radar signal generation. However, the linearly frequency-modulated (LFM) signal bandwidth generated by P1 dynamics is constrained by the limited variation range of the injection strength. In this Letter, a bandwidth-enhanced LFM signal generation method by P1 dynamics in an optically injected directly modulated semiconductor laser (DM-SL) is proposed. In addition to controlling the injection strength via electro-optical modulation, which is the same as the previous schemes, the bias current of the DM-SL is regulated via direct modulation. By interaction between the carrier effect and temperature effect in the optically injected DM-SL, the P1 oscillation frequency is increased under the same optical injection strength, leading to the generation of LFM signals with enlarged bandwidth. In the experiment, the maximum signal bandwidth reaches 21 GHz (11.7-32.7 GHz), which is enhanced by 11 GHz compared with that generated without bias current regulation. The proposed method is a promising technique for ultra-wideband radar signal generators.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3572-3575"},"PeriodicalIF":3.1000,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Bandwidth-enhanced LFM signal generation by period-one dynamics in a directly modulated semiconductor laser.\",\"authors\":\"Gengze Wu, Fangzheng Zhang, Xiaoyue Yu, Xin Yan, Hao Wang, Yuan Yu, Shilong Pan\",\"doi\":\"10.1364/OL.559656\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Period-one (P1) laser dynamics provide effective methods for radar signal generation. However, the linearly frequency-modulated (LFM) signal bandwidth generated by P1 dynamics is constrained by the limited variation range of the injection strength. In this Letter, a bandwidth-enhanced LFM signal generation method by P1 dynamics in an optically injected directly modulated semiconductor laser (DM-SL) is proposed. In addition to controlling the injection strength via electro-optical modulation, which is the same as the previous schemes, the bias current of the DM-SL is regulated via direct modulation. By interaction between the carrier effect and temperature effect in the optically injected DM-SL, the P1 oscillation frequency is increased under the same optical injection strength, leading to the generation of LFM signals with enlarged bandwidth. In the experiment, the maximum signal bandwidth reaches 21 GHz (11.7-32.7 GHz), which is enhanced by 11 GHz compared with that generated without bias current regulation. The proposed method is a promising technique for ultra-wideband radar signal generators.</p>\",\"PeriodicalId\":19540,\"journal\":{\"name\":\"Optics letters\",\"volume\":\"50 11\",\"pages\":\"3572-3575\"},\"PeriodicalIF\":3.1000,\"publicationDate\":\"2025-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Optics letters\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1364/OL.559656\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"OPTICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.559656","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
Bandwidth-enhanced LFM signal generation by period-one dynamics in a directly modulated semiconductor laser.
Period-one (P1) laser dynamics provide effective methods for radar signal generation. However, the linearly frequency-modulated (LFM) signal bandwidth generated by P1 dynamics is constrained by the limited variation range of the injection strength. In this Letter, a bandwidth-enhanced LFM signal generation method by P1 dynamics in an optically injected directly modulated semiconductor laser (DM-SL) is proposed. In addition to controlling the injection strength via electro-optical modulation, which is the same as the previous schemes, the bias current of the DM-SL is regulated via direct modulation. By interaction between the carrier effect and temperature effect in the optically injected DM-SL, the P1 oscillation frequency is increased under the same optical injection strength, leading to the generation of LFM signals with enlarged bandwidth. In the experiment, the maximum signal bandwidth reaches 21 GHz (11.7-32.7 GHz), which is enhanced by 11 GHz compared with that generated without bias current regulation. The proposed method is a promising technique for ultra-wideband radar signal generators.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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