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Express"],"published-print":{"date-parts":[[2025,10,6]]},"abstract":"<jats:p>Linear-frequency-swept (LFS) phase-sensitive optical time domain reflectometry (\u03a6-OTDR) can overcome the constraints between spatial resolution and signal-to-noise ratio. However, the Doppler shift induced by vibration in the Rayleigh backscattering (RBS) signal generates significant crosstalk beyond the vibration area. Here, we propose and demonstrate a Doppler-crosstalk-suppressed quasi-distributed acoustic sensor (QDAS) based on an LFS \u03a6-OTDR, utilizing a discrete Rayleigh-enhanced single-mode fiber (eSMF). The mechanism of Doppler-induced crosstalk was analyzed, and the effects of pulse parameters, including pulse width, sweep rate, and bandwidth, were studied. Moreover, a discrete eSMF was proposed to suppress the crosstalk by reducing the change rate in the local phase. As a proof of concept, a vibration signal with a frequency of 8 kHz was successfully detected with a spatial resolution of 10 cm, a strain resolution of 190 p\u03b5\/\u221aHz, and an improved crosstalk suppression of 20 dB. The proposed QDAS system with Doppler-induced crosstalk suppression is promising for ultrasonic structural health monitoring, such as aerial vehicles and deep-sea submersibles.<\/jats:p>","DOI":"10.1364\/oe.568572","type":"journal-article","created":{"date-parts":[[2025,9,19]],"date-time":"2025-09-19T13:00:09Z","timestamp":1758286809000},"page":"42358","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Suppression of Doppler-induced crosstalk in linear-frequency-swept \u03a6-OTDR using scattering-enhanced fiber"],"prefix":"10.1364","volume":"33","author":[{"given":"Yihang","family":"Wang","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01vy4gh70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baijie","family":"Xu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01vy4gh70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guanfeng","family":"Chen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01vy4gh70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zichen","family":"Li","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01vy4gh70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Du","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01vy4gh70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8375-8471","authenticated-orcid":true,"given":"Xizhen","family":"Xu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01vy4gh70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7730-8906","authenticated-orcid":true,"given":"Yiping","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01vy4gh70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9417-2019","authenticated-orcid":true,"given":"Jun","family":"He","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01vy4gh70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2025,9,26]]},"reference":[{"key":"oe-33-20-42358-R1","doi-asserted-by":"publisher","first-page":"2925","DOI":"10.1364\/OE.28.002925","volume":"28","author":"Li","year":"2020","journal-title":"Opt. 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