{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T00:33:44Z","timestamp":1760402024352,"version":"build-2065373602"},"reference-count":19,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2021,3,27]],"date-time":"2021-03-27T00:00:00Z","timestamp":1616803200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["JP18H01451"],"award-info":[{"award-number":["JP18H01451"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A novel tunable Erbium-doped fiber ring laser (EDFRL) with a cascaded-chirped long-period fiber grating (C-CLPG) as a wavelength selection filter is proposed from the viewpoint of the sensor use, in which a variable optical attenuator (VOA) is employed as an intracavity loss modulator to change the oscillation wavelength region so that the resultant tuning wavelength range is widened. In the demonstrative experiment for temperature measurements, oscillation over the wavelength range of 12.85 nm (1557.62~1570.47 nm), which is more than three times range of the previously presented laser and is equivalent to 64 \u00b0C in terms of temperature change, was achieved, while a single-wavelength oscillation was maintained. In addition, a practical technique for realizing a temperature measurement by combining with the VOA control is also discussed.<\/jats:p>","DOI":"10.3390\/s21072342","type":"journal-article","created":{"date-parts":[[2021,3,28]],"date-time":"2021-03-28T23:27:25Z","timestamp":1616974045000},"page":"2342","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Loss-Modulation-Based Wavelength-Range Shifting of Tunable EDF Ring Laser with Cascaded-Chirped Long-Period Fiber Grating for Temperature Measurement"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6364-5696","authenticated-orcid":false,"given":"Koken","family":"Fukushima","sequence":"first","affiliation":[{"name":"Department of Communications Engineering, National Defense Academy, 1-10-20 Hashirimizu, Kanagawa, Yokosuka 239-8686, Japan"}]},{"given":"Manuel","family":"Guterres Soares","sequence":"additional","affiliation":[{"name":"Department of Communications Engineering, National Defense Academy, 1-10-20 Hashirimizu, Kanagawa, Yokosuka 239-8686, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6556-4398","authenticated-orcid":false,"given":"Atsushi","family":"Wada","sequence":"additional","affiliation":[{"name":"Department of Communications Engineering, National Defense Academy, 1-10-20 Hashirimizu, Kanagawa, Yokosuka 239-8686, Japan"}]},{"given":"Satoshi","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Department of Communications Engineering, National Defense Academy, 1-10-20 Hashirimizu, Kanagawa, Yokosuka 239-8686, Japan"}]},{"given":"Fumihiko","family":"Ito","sequence":"additional","affiliation":[{"name":"Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu-cho, Shimane, Matsue 690-8504, Japan"}]}],"member":"1968","published-online":{"date-parts":[[2021,3,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Othonos, A., and Kalli, K. (1999). Fiber Bragg Gratings ~Fundamentals and Applications in Telecommunications and Sensing, Artech House.","DOI":"10.1063\/1.883086"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"58","DOI":"10.1109\/50.476137","article-title":"Long-period fiber gratings as band-rejection filters","volume":"14","author":"Vengsarkar","year":"1996","journal-title":"J. Lightwave. Technol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"R49","DOI":"10.1088\/0957-0233\/14\/5\/201","article-title":"Optical fibre long-period grating sensors: Characteristics and application","volume":"14","author":"James","year":"2003","journal-title":"Meas. Sci. Technol."},{"key":"ref_4","unstructured":"Tanaka, S., Tsukida, O., Ngo, T.T., Wada, A., and Takahashi, N. (October, January 28). Simultaneous multipoint strain measurement using cascaded long period fiber gratings. 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