{"title":"Photonic generation of a linearly chirped microwave waveform with long temporal duration using a dispersive loop","authors":"Jiejun Zhang, O. Coutinho, J. Yao","doi":"10.1109/MWSYM.2015.7167049","DOIUrl":null,"url":null,"abstract":"We propose and experimentally demonstrate a photonic approach to generating a linearly chirped microwave waveform with a large time bandwidth product (TBWP) based on spectral shaping and wavelength-to-time (SS-WTT) mapping. The spectral shaping is performed using a Fabry-Perot interferometer (FPI) consisting of two linearly chirped fiber Bragg gratings (LCFBG) with complementary dispersion to produce a spectral response with a linearly increasing or decreasing free spectral range. The wavelength-to-time mapping is performed using a dispersive loop incorporating a third LCFBG. Thanks to the multiple-time use of the third LCFBG, an extremely large equivalent dispersion can be achieved, which leads to the generation of a linearly chirped microwave waveform with a long temporal duration. The proposed technique is validated by an experiment. Two linearly chirped microwave waveforms with a TBWP of 225 and a temporal duration of 25 and 45 ns are generated.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"14 1","pages":"1-3"},"PeriodicalIF":0.0000,"publicationDate":"2015-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2015 IEEE MTT-S International Microwave Symposium","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MWSYM.2015.7167049","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 8
Abstract
We propose and experimentally demonstrate a photonic approach to generating a linearly chirped microwave waveform with a large time bandwidth product (TBWP) based on spectral shaping and wavelength-to-time (SS-WTT) mapping. The spectral shaping is performed using a Fabry-Perot interferometer (FPI) consisting of two linearly chirped fiber Bragg gratings (LCFBG) with complementary dispersion to produce a spectral response with a linearly increasing or decreasing free spectral range. The wavelength-to-time mapping is performed using a dispersive loop incorporating a third LCFBG. Thanks to the multiple-time use of the third LCFBG, an extremely large equivalent dispersion can be achieved, which leads to the generation of a linearly chirped microwave waveform with a long temporal duration. The proposed technique is validated by an experiment. Two linearly chirped microwave waveforms with a TBWP of 225 and a temporal duration of 25 and 45 ns are generated.