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Lett."],"published-print":{"date-parts":[[2026,7,1]]},"abstract":"<jats:p>Intensity-modulation\/direct-detection (IM\/DD) optical networks require fiber-optic integrated sensing and communication (F-ISAC) schemes with low hardware complexity and negligible communication penalty. Here, we propose and experimentally demonstrate a simplified F-ISAC scheme enabled by a frequency-swept laser (FSL), which directly generates the periodically swept optical carrier and eliminates the external-modulation-based swept-carrier generation stage. With a single intensity modulator, the system supports 70-Gb\/s six-level pulse amplitude modulation (PAM-6) signal transmission and distributed sensing. A sawtooth driving waveform with an inserted transition edge is used to stabilize the FSL output for accurate sensing demodulation. The proposed system retains almost the same forward transmitter and direct-detection receiver as a conventional PAM-based IM\/DD link, with only an additional sensing receiver for Rayleigh backscattering detection. Compared with a conventional PAM-based IM\/DD system, it increases the optimal launch power by approximately 4\u2009dB and reduces the receiver power penalty by approximately 2\u2009dB at the 7% hard-decision forward-error-correction (HD-FEC) threshold. A spatial resolution of 10\u2009m and a strain sensitivity of 170 p\u03b5\/\u221aHz are also achieved.<\/jats:p>","DOI":"10.1364\/ol.605151","type":"journal-article","created":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T20:00:09Z","timestamp":1781208009000},"page":"3649","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Simplified fiber-optic integrated sensing and IM\/DD communication enabled by a frequency-swept laser"],"prefix":"10.1364","volume":"51","author":[{"given":"Hailong","family":"Fan","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00hn7w693","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Southwest Jiaotong University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1010-8563","authenticated-orcid":true,"given":"Haijun","family":"He","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00hn7w693","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Southwest Jiaotong University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhengyu","family":"Pu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00hn7w693","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Southwest Jiaotong University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6536-7602","authenticated-orcid":true,"given":"Di","family":"Zheng","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00hn7w693","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Southwest Jiaotong University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7240-4229","authenticated-orcid":true,"given":"Xihua","family":"Zou","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00hn7w693","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Southwest Jiaotong University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Pan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00hn7w693","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Southwest Jiaotong University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3633-7161","authenticated-orcid":true,"given":"Lianshan","family":"Yan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00hn7w693","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Southwest Jiaotong University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,6,24]]},"reference":[{"key":"ol-51-13-3649-R1","doi-asserted-by":"publisher","first-page":"A61","DOI":"10.1364\/JOCN.439175","type":"journal-article","volume":"14","author":"Ip","year":"2022","journal-title":"J. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}