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Express"],"published-print":{"date-parts":[[2023,10,9]]},"abstract":"<jats:p>\n                    Wavelength-tunable laser diode with a wide tuning range is required for optical communication systems and optical sensing. External cavity laser diodes with silicon-photonic wire waveguides and ring resonators have small footprint because of high refractive index contrast between Si. However, power coupling efficiency\n                    <jats:italic>\u03ba<\/jats:italic>\n                    of conventional straight directional coupler between ring and bus waveguides have large wavelength dependence, which lowers tunable range. In this study, we demonstrate a hybrid wavelength-tunable laser diode using curved directional couplers, whose wavelength dependence on\n                    <jats:italic>\u03ba<\/jats:italic>\n                    is low. The wavelength-tunable range record of 120.9\u2005nm has been achieved. In addition, curved directional couplers are tolerant of waveguide width fabrication error.\n                  <\/jats:p>","DOI":"10.1364\/oe.499687","type":"journal-article","created":{"date-parts":[[2023,9,25]],"date-time":"2023-09-25T02:00:07Z","timestamp":1695607207000},"page":"34946","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Hybrid laser diode with ultrawide wavelength-tunable range using curved directional couplers"],"prefix":"10.1364","volume":"31","author":[{"given":"Kissho","family":"Iwanaga","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00ntfnx83","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuga","family":"Tomimura","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00ntfnx83","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5247-939X","authenticated-orcid":true,"given":"Tomohiro","family":"Kita","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00ntfnx83","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2023,10,3]]},"reference":[{"key":"oe-31-21-34946-R1","first-page":"73","article-title":"Dense wavelength division multiplexing networks: Principles and applications","author":"Tranter","year":"2007"},{"key":"oe-31-21-34946-R2","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1109\/50.857759","volume":"18","author":"Sarlet","year":"2000","journal-title":"J. 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