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The application of MCFs in the field of sensing has also received more and more attention, among which MCF fiber Bragg grating (FBG) devices have received more and more attention and have been widely used in various fields. In this paper, the main writing methods of MCF FBGs and their sensing applications are reviewed. The future development of the MCF FBG is also prospected.<\/jats:p>","DOI":"10.3390\/s24144532","type":"journal-article","created":{"date-parts":[[2024,7,15]],"date-time":"2024-07-15T14:15:49Z","timestamp":1721052949000},"page":"4532","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Multi-Core Fiber Bragg Grating and Its Sensing Application"],"prefix":"10.3390","volume":"24","author":[{"given":"Xiaotong","family":"Zhang","sequence":"first","affiliation":[{"name":"Center for Advanced Manufacturing and Future Industry, Future Technology School, Shenzhen Technology University, Shenzhen 518118, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6898-7484","authenticated-orcid":false,"given":"Hongye","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Lab of In-Fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin 150001, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-5969-1721","authenticated-orcid":false,"given":"Tingting","family":"Yuan","sequence":"additional","affiliation":[{"name":"Center for Advanced Manufacturing and Future Industry, Future Technology School, Shenzhen Technology University, Shenzhen 518118, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2425-4553","authenticated-orcid":false,"given":"Libo","family":"Yuan","sequence":"additional","affiliation":[{"name":"Photonics Research Center, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"354","DOI":"10.1038\/nphoton.2013.94","article-title":"Space-division multiplexing in optical fibres","volume":"7","author":"Richardson","year":"2013","journal-title":"Nat. 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