{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,16]],"date-time":"2025-12-16T12:41:45Z","timestamp":1765888905161,"version":"build-2065373602"},"reference-count":28,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2022,6,8]],"date-time":"2022-06-08T00:00:00Z","timestamp":1654646400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Research Foundation of Korea (NRF)","award":["NRF-2019R1A2C1084933","NRF-2020R1A6A1A03047771","P0008458"],"award-info":[{"award-number":["NRF-2019R1A2C1084933","NRF-2020R1A6A1A03047771","P0008458"]}]},{"name":"Korea Institute for Advancement of Technology (KIAT)","award":["NRF-2019R1A2C1084933","NRF-2020R1A6A1A03047771","P0008458"],"award-info":[{"award-number":["NRF-2019R1A2C1084933","NRF-2020R1A6A1A03047771","P0008458"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The output of a wavelength-swept laser (WSL) based on a fiber Fabry\u2013P\u00e9rot tunable filter (FFP-TF) tends to shift the peak wavelength due to external temperature or heat generated by the FFP-TF itself. Therefore, when measuring the output of WSL for a long time, it is very difficult to accurately measure a signal in the temporal domain corresponding to a specific wavelength of the output of the WSL. If the wavelength variation of the WSL output can be predicted through the peak time information of the forward scan or the backward scan from the WSL, the variation of the peak wavelength can be compensated for by adjusting the offset voltage applied to the FFP-TF. This study presents a successful stabilization method for peak wavelength variation in WSLs by adjusting the offset voltage of the FFP-TF with closed-loop control. The closed-loop control is implemented by measuring the deviation in the WSL peak position in the temporal domain using the trigger signal of the function generator. The feedback repetition rate for WSL stabilization was approximately 0.2 s, confirming that the WSL output and the peak position for the fiber Bragg grating (FBG) reflection spectrum were kept constant within \u00b17 \u03bcs at the maximum when the stabilization loop was applied. The standard deviations of WSL output and reflection peak positions were 1.52 \u03bcs and 1.59 \u03bcs, respectively. The temporal and spectral domains have a linear relationship; the \u00b17 \u03bcs maximum variation of the peak position corresponded to \u00b10.035 nm of the maximum wavelength variation in the spectral domain. The proposed WSL system can be used as a light source for temperature or strain-dependent sensors as it compensates for the WSL wavelength variation in applications that do not require a fast scanning rate.<\/jats:p>","DOI":"10.3390\/s22124337","type":"journal-article","created":{"date-parts":[[2022,6,13]],"date-time":"2022-06-13T02:01:44Z","timestamp":1655085704000},"page":"4337","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Output Stabilization of Wavelength-Swept Laser Based on Closed-Loop Control of Fabry\u2013P\u00e9rot Tunable Wavelength Filter for Fiber-Optic Sensors"],"prefix":"10.3390","volume":"22","author":[{"given":"Byeong Kwon","family":"Choi","sequence":"first","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea"}]},{"given":"Soyeon","family":"Ahn","sequence":"additional","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea"}]},{"given":"Ji Su","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9301-0694","authenticated-orcid":false,"given":"Srinivas","family":"Pagidi","sequence":"additional","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea"},{"name":"Institute of Quantum Systems (IQS), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9944-8993","authenticated-orcid":false,"given":"Min Yong","family":"Jeon","sequence":"additional","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea"},{"name":"Institute of Quantum Systems (IQS), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2022,6,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"843","DOI":"10.1364\/OL.23.000843","article-title":"Interrogation of fiber grating sensor arrays with a wavelength-swept fiber laser","volume":"23","author":"Yun","year":"1998","journal-title":"Opt. 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