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The time-domain waveform is then processed by a digital signal processor (DSP), where the time-domain waveform is compared with a reference waveform through cross-correlation. A narrow correlation peak indicating the time shift of the waveform is obtained. Since the time shift is linearly proportional to the wavelength shift of the mMZI, the wavelength shift of the mMZI is measured. In the experiment, the surrounding RI of ethanol gas is measured at a scanning speed as high as 1.6 MHz. The results show that the sensor has a sensitivity and resolution of -0.3663 ps\/ppm and 54.6 ppm, respectively, without any surface modification. The proposed sensing system used to monitor the diffusion of ethanol vapor in real time and to mark the gas concentration after the diffusion has also been studied.<\/jats:p>","DOI":"10.1364\/oe.558288","type":"journal-article","created":{"date-parts":[[2025,4,10]],"date-time":"2025-04-10T09:01:52Z","timestamp":1744275712000},"page":"18728","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["High-speed organic gas sensor using a microfiber Mach-Zehnder interferometer interrogated based on microwave photonic pulse compression"],"prefix":"10.1364","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-8363-9413","authenticated-orcid":true,"given":"Baoliang","family":"Liao","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tengxiang","family":"Li","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6679-3208","authenticated-orcid":true,"given":"Tiansheng","family":"Huang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangying","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jingxu","family":"Chen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4185-8543","authenticated-orcid":true,"given":"Li-peng","family":"Sun","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanyan","family":"Zhi","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3359-4533","authenticated-orcid":true,"given":"Yuan","family":"Cao","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4137-870X","authenticated-orcid":true,"given":"Jiejun","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Li","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0388-1424","authenticated-orcid":true,"given":"Xinhuan","family":"Feng","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3790-2986","authenticated-orcid":true,"given":"Bai-ou","family":"Guan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02xe5ns62","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2025,4,21]]},"reference":[{"key":"oe-33-9-18728-R1","doi-asserted-by":"publisher","first-page":"106792","DOI":"10.1016\/j.optlaseng.2021.106792","volume":"149","author":"Li","year":"2022","journal-title":"Opt. 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