We demonstrate a tunable grating in a six-hole anti-resonant hollow core fiber (AR-HCF) based on acousto-optic interaction, by applying flexural acoustic waves along the fiber axis. In the experiment, the resonant wavelengths could be electrically tuned within a range of 1329 nm to 1353 nm, consistent with the simulation results. The tuning range is primarily limited by the narrow response bandwidth of the acoustic field of AR-HCF. The minimum 3 dB bandwidth is 4.5 nm, and the maximal notch depth is 12.5 dB. Acoustically-induced fiber gratings benefit from the high damage threshold, low dispersion, and low nonlinearity characteristics of AR-HCF, can serve as tunable filters in fast-tunable high-power lasers, long-distance fiber communication, and WDM networks. Additionally, due to the low thermal sensitivity and radiation resistance characteristics of AR-HCF, these gratings could be applied in fiber grating sensing and laser transmission, particularly in radiation environments.
{"title":"Tunable Acoustically-Induced Fiber Gratings Based on the Anti-Resonant Hollow-Core Fiber","authors":"Ligang Huang;Yanxiang Zhao;Yujia Li;Shunli Liu;Hailin Zhou;Lei Gao;Guiyao Zhou;Tao Zhu","doi":"10.1109/LPT.2024.3468871","DOIUrl":"https://doi.org/10.1109/LPT.2024.3468871","url":null,"abstract":"We demonstrate a tunable grating in a six-hole anti-resonant hollow core fiber (AR-HCF) based on acousto-optic interaction, by applying flexural acoustic waves along the fiber axis. In the experiment, the resonant wavelengths could be electrically tuned within a range of 1329 nm to 1353 nm, consistent with the simulation results. The tuning range is primarily limited by the narrow response bandwidth of the acoustic field of AR-HCF. The minimum 3 dB bandwidth is 4.5 nm, and the maximal notch depth is 12.5 dB. Acoustically-induced fiber gratings benefit from the high damage threshold, low dispersion, and low nonlinearity characteristics of AR-HCF, can serve as tunable filters in fast-tunable high-power lasers, long-distance fiber communication, and WDM networks. Additionally, due to the low thermal sensitivity and radiation resistance characteristics of AR-HCF, these gratings could be applied in fiber grating sensing and laser transmission, particularly in radiation environments.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432961","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}
Pub Date : 2024-09-26DOI: 10.1109/LPT.2024.3468647
Haoyun Zhang;Xuecheng Wu;Weiqi Jiang;Shining Zhu;Fengqiu Wang
Electro-optic frequency combs, generated by cascaded intensity and phase modulators, are known for their frequency agility. However, frequency detuning induced pulse distortion significantly hinders their applicability in asynchronous optical sampling. In this letter, we propose a scheme where a motor-driven optical delay line between the phase and intensity modulators serves as an effective pulse-duration compensation mechanism. A 10 GHz flat-topped optical frequency comb (OFC) at a central wavelength of 1552 nm is first optimized to output a 7.2 ps pulse. It is seen that the temporal pulses experience dramatic distortion and elongation (up to 130 ps) when frequency offset is present. Interestingly, the output pulse duration is periodically modulated by the frequency offset, and the associated period is inversely proportional to a system delay time ( $tau $