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Opt. Commun. Netw."],"published-print":{"date-parts":[[2024,7,1]]},"abstract":"Future passive optical networks (PONs) for 200Gb\/s\/\u03bb<\/jats:italic>, and beyond, pose a significant technological challenge. The use of coherent technology in access networks provides a great solution based on concepts from mature technologies to achieve the speeds needed for very-high-speed PON (VHSP). In this paper, we provide an overview of the currently demonstrated technologies and propose a possible simplified optical network unit (ONU) for time division multiplex PON (TDM-PON). The proposed ONU uses a single polarization heterodyne receiver, using either a balanced photodiode or a single-ended one and an electro-absorption modulated laser (EML)-based transmitter. The experimental demonstration using the proposed ONU in a bidirectional, symmetrical transmission over fiber distances of 20\u00a0km and 40\u00a0km shows the viability of the technology. The downstream direction achieves a power budget of 34.3\/29.3\u00a0dB for 20\u00a0km and 33.9\/29\u00a0dB for 40\u00a0km, for a balanced\/single-ended receiver, whereas the upstream transmission achieves 29.3\u00a0dB for both scenarios.<\/jats:p>","DOI":"10.1364\/jocn.514867","type":"journal-article","created":{"date-parts":[[2024,2,16]],"date-time":"2024-02-16T17:00:06Z","timestamp":1708102806000},"page":"C1","update-policy":"http:\/\/dx.doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Simplified coherent optical network units for very-high-speed passive optical networks"],"prefix":"10.1364","volume":"16","author":[{"ORCID":"http:\/\/orcid.org\/0000-0002-6797-3507","authenticated-orcid":true,"given":"Istvan Bence","family":"Kovacs","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/013meh722","id-type":"ROR","asserted-by":"publisher"}]}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-6045-6291","authenticated-orcid":true,"given":"Md. 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