{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T04:57:41Z","timestamp":1774501061127,"version":"3.50.1"},"reference-count":13,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2011,9,27]],"date-time":"2011-09-27T00:00:00Z","timestamp":1317081600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Linewidth measurements of a distributed feedback (DFB) fibre laser are made using delayed self heterodyne interferometry (DHSI) with both Mach-Zehnder and Michelson interferometer configurations. Voigt fitting is used to extract and compare the Lorentzian and Gaussian linewidths and associated sources of noise. The respective measurements are wL (MZI) = (1.6 \u00b1 0.2) kHz and wL (MI) = (1.4 \u00b1 0.1) kHz. The Michelson with Faraday rotator mirrors gives a slightly narrower linewidth with significantly reduced error. This is explained by the unscrambling of polarisation drift using the Faraday rotator mirrors, confirmed by comparing with non-rotating standard gold coated fibre end mirrors.<\/jats:p>","DOI":"10.3390\/s111009233","type":"journal-article","created":{"date-parts":[[2011,9,27]],"date-time":"2011-09-27T20:09:10Z","timestamp":1317154150000},"page":"9233-9241","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["A Comparison of Delayed Self-Heterodyne Interference Measurement of Laser Linewidth Using Mach-Zehnder and Michelson Interferometers"],"prefix":"10.3390","volume":"11","author":[{"given":"Albert","family":"Canagasabey","sequence":"first","affiliation":[{"name":"Interdisciplinary Photonics Laboratories (iPL), School of Chemistry, University of Sydney, 2006, NSW, Australia"},{"name":"Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, 2006, NSW, Australia"}]},{"given":"Andrew","family":"Michie","sequence":"additional","affiliation":[{"name":"Interdisciplinary Photonics Laboratories (iPL), School of Chemistry, University of Sydney, 2006, NSW, Australia"},{"name":"Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, 2006, NSW, Australia"}]},{"given":"John","family":"Canning","sequence":"additional","affiliation":[{"name":"Interdisciplinary Photonics Laboratories (iPL), School of Chemistry, University of Sydney, 2006, NSW, Australia"}]},{"given":"John","family":"Holdsworth","sequence":"additional","affiliation":[{"name":"SMAPS, University of Newcastle, Callaghan, NSW 2308, Australia"}]},{"given":"Simon","family":"Fleming","sequence":"additional","affiliation":[{"name":"Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, 2006, NSW, Australia"}]},{"given":"Hsiao-Chuan","family":"Wang","sequence":"additional","affiliation":[{"name":"Interdisciplinary Photonics Laboratories (iPL), School of Chemistry, University of Sydney, 2006, NSW, Australia"},{"name":"Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, 2006, NSW, Australia"}]},{"given":"Mattias L.","family":"\u00c5slund","sequence":"additional","affiliation":[{"name":"Interdisciplinary Photonics Laboratories (iPL), School of Chemistry, University of Sydney, 2006, NSW, Australia"}]}],"member":"1968","published-online":{"date-parts":[[2011,9,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1229","DOI":"10.1049\/el:19940842","article-title":"Frequency noise of a bragg grating fiber laser","volume":"30","author":"Ball","year":"1994","journal-title":"Electron. 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