{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,17]],"date-time":"2026-01-17T23:15:01Z","timestamp":1768691701531,"version":"3.49.0"},"reference-count":27,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2022,11,16]],"date-time":"2022-11-16T00:00:00Z","timestamp":1668556800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2019R1A2C1084933"],"award-info":[{"award-number":["2019R1A2C1084933"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2020R1A6A1A03047771"],"award-info":[{"award-number":["2020R1A6A1A03047771"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2021RIS-004"],"award-info":[{"award-number":["2021RIS-004"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["P0008458"],"award-info":[{"award-number":["P0008458"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Ministry of Education(MOE)","award":["2019R1A2C1084933"],"award-info":[{"award-number":["2019R1A2C1084933"]}]},{"name":"Ministry of Education(MOE)","award":["2020R1A6A1A03047771"],"award-info":[{"award-number":["2020R1A6A1A03047771"]}]},{"name":"Ministry of Education(MOE)","award":["2021RIS-004"],"award-info":[{"award-number":["2021RIS-004"]}]},{"name":"Ministry of Education(MOE)","award":["P0008458"],"award-info":[{"award-number":["P0008458"]}]},{"name":"The Competency Development Program for Industry Specialist","award":["2019R1A2C1084933"],"award-info":[{"award-number":["2019R1A2C1084933"]}]},{"name":"The Competency Development Program for Industry Specialist","award":["2020R1A6A1A03047771"],"award-info":[{"award-number":["2020R1A6A1A03047771"]}]},{"name":"The Competency Development Program for Industry Specialist","award":["2021RIS-004"],"award-info":[{"award-number":["2021RIS-004"]}]},{"name":"The Competency Development Program for Industry Specialist","award":["P0008458"],"award-info":[{"award-number":["P0008458"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Broadband wavelength-swept lasers (WSLs) are widely used as light sources in biophotonics and optical fiber sensors. Herein, we present a polygonal mirror scanning wavelength filter (PMSWF)-based broadband WSL using two semiconductor optical amplifiers (SOAs) with different center wavelengths as the gain medium. The 10-dB bandwidth of the wavelength scanning range with 3.6 kHz scanning frequency was approximately 223 nm, from 1129 nm to 1352 nm. When the scanning frequency of the WSL was increased, the intensity and bandwidth decreased. The main reason for this is that the laser oscillation time becomes insufficient as the scanning frequency increases. We analyzed the intensity and bandwidth decrease according to the increase in the scanning frequency in the WSL through the concept of saturation limit frequency. In addition, optical alignment is important for realizing broadband WSLs. The optimal condition can be determined by analyzing the beam alignment according to the position of the diffraction grating and the lenses in the PMSWF. This broadband WSL is specially expected to be used as a light source in broadband distributed dynamic FBG fiber-optic sensors.<\/jats:p>","DOI":"10.3390\/s22228867","type":"journal-article","created":{"date-parts":[[2022,11,17]],"date-time":"2022-11-17T06:24:42Z","timestamp":1668666282000},"page":"8867","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Output Characterization of 220 nm Broadband 1250 nm Wavelength-Swept Laser for Dynamic Optical Fiber Sensors"],"prefix":"10.3390","volume":"22","author":[{"given":"Gi Hyen","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of 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, Republic of Korea"}]},{"given":"Min Su","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea"}]},{"given":"Sang Won","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of 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, Republic of Korea"}]},{"given":"Byeong Kwon","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9301-0694","authenticated-orcid":false,"given":"Srinivas","family":"Pagidi","sequence":"additional","affiliation":[{"name":"Institute of Quantum Systems (IQS), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of 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, Republic of Korea"},{"name":"Institute of Quantum Systems (IQS), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1981","DOI":"10.1364\/OL.28.001981","article-title":"High-speed wavelength-swept semiconductor laser with a polygon-scanner-based wavelength filter","volume":"28","author":"Yun","year":"2003","journal-title":"Opt. 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