{"title":"Linearizing Optical Frequency Chirp of a Laser Diode for Accurate FMCW Optical Ranging","authors":"Meng Shan;Koichi Iiyama","doi":"10.1109/LPT.2025.3554238","DOIUrl":null,"url":null,"abstract":"Optical frequency chirp of an external-cavity laser is linearized by optimizing the modulation waveform for long-range FMCW optical ranging system. The modulation signal of the laser is sampled with the interference signal of the auxiliary interferometer, and the sampled modulation signal is used as a new modulation signal. As a result, the optical frequency is linearly chirped. The linearization is realized at 50kHz modulation frequency and the measurement range of up to 66m optical fiber and up to 10m in free space. The linearity of the optical frequency chirp is evaluated by the ranging resolution and the ranging accuracy of the FMCW optical ranging system, and the ranging resolution is almost the theoretical limit, indicating that the optical frequency of the laser is highly linearly chirped.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 8","pages":"461-464"},"PeriodicalIF":2.5000,"publicationDate":"2025-03-24","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/10938221/","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
Optical frequency chirp of an external-cavity laser is linearized by optimizing the modulation waveform for long-range FMCW optical ranging system. The modulation signal of the laser is sampled with the interference signal of the auxiliary interferometer, and the sampled modulation signal is used as a new modulation signal. As a result, the optical frequency is linearly chirped. The linearization is realized at 50kHz modulation frequency and the measurement range of up to 66m optical fiber and up to 10m in free space. The linearity of the optical frequency chirp is evaluated by the ranging resolution and the ranging accuracy of the FMCW optical ranging system, and the ranging resolution is almost the theoretical limit, indicating that the optical frequency of the laser is highly linearly chirped.
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.
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