{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T15:28:31Z","timestamp":1786375711403,"version":"build-2736575974"},"reference-count":10,"publisher":"Optica Publishing Group","issue":"16","license":[{"start":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T00:00:00Z","timestamp":1786320000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR"},{"start":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T00:00:00Z","timestamp":1786320000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"DOI":"10.13039\/501100002855","name":"Ministry of Science and Technology of the People's Republic of China","doi-asserted-by":"crossref","award":["2024YFE0105600"],"award-info":[{"award-number":["2024YFE0105600"]}],"id":[{"id":"10.13039\/501100002855","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/027s68j25","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["62271010"],"award-info":[{"award-number":["62271010"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Lett."],"published-print":{"date-parts":[[2026,8,15]]},"abstract":"<jats:p>Coherent time- and frequency-division multiplexing (TFDM) passive optical network (PON) provides flexible resource allocation and low-latency access. However, the peak-to-average power ratio (PAPR) increases with the number of subcarriers, leading to reduced launch power and power budget. In this Letter, we propose and experimentally demonstrate a low-complexity PAPR reduction scheme for 400-Gb\/s coherent TFDM PON. The proposed pre-conditioned and orthogonal phase shaping (POPS) scheme first applies Schroeder phase pre-conditioning to suppress subcarrier phase alignment and then selectively performs Walsh\u2013Hadamard-structured phase shaping only for high-PAPR blocks. The block-wise phase rotations are recovered using embedded pilots, avoiding explicit side-information transmission. In a 20-km 400-Gb\/s coherent TFDM PON experiment with 4\u201316 digital subcarriers, POPS achieves up to 6.02-dB PAPR reduction and 5.76-dB power-budget improvement with only 1.76% symbol overhead, while reducing the phase-search complexity to linear order.<\/jats:p>","DOI":"10.1364\/ol.609876","type":"journal-article","created":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T14:00:10Z","timestamp":1785160810000},"page":"4613","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["PAPR reduction with low-complexity pre-conditioned and orthogonal phase shaping in 400G coherent TFDM PON"],"prefix":"10.1364","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-8298-188X","authenticated-orcid":true,"given":"Yutong","family":"Pan","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02v51f717","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianhong","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02v51f717","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9898-3804","authenticated-orcid":true,"given":"Yixiao","family":"Zhu","sequence":"additional","affiliation":[{"name":"Shanghai Jiao Tong University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenhao","family":"Wang","sequence":"additional","affiliation":[{"name":"SiFotonics Technologies Co. Ltd."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ning","family":"Zhang","sequence":"additional","affiliation":[{"name":"SiFotonics Technologies Co. Ltd."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fan","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02v51f717","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Peng Cheng Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,8,10]]},"reference":[{"key":"ol-51-16-4613-R1","doi-asserted-by":"publisher","first-page":"982","DOI":"10.1364\/JOCN.468920","type":"journal-article","volume":"14","author":"Torres-Ferrera","year":"2022","journal-title":"J. Opt. Commun. Netw."},{"key":"ol-51-16-4613-R2","doi-asserted-by":"publisher","first-page":"D86","DOI":"10.1364\/JOCN.391033","type":"journal-article","volume":"12","author":"Zou","year":"2020","journal-title":"J. Opt. Commun. 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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"}]}}