DSP-free coherent receivers in frequency-synchronous optical networks for next-generation datacenter interconnects

DSP-free coherent receivers in frequency-synchronous optical networks for next-generation datacenter interconnects | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article DSP-free coherent receivers in frequency-synchronous optical networks for next-generation datacenter interconnects Lei Liu, Feng Liu, Cheng Peng, Bo Xu, William Shieh This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4722695/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Propelled by the rise of artificial intelligence (AI), cloud services and data center applications, next-generation low-power, local-oscillator-less, and DSP-free short-reach coherent optical communication has evolved into an increasingly prominent area of research in recent years. Here, we demonstrate DSP-free coherent optical transmission by analog signal processing in frequency synchronous optical networks (FSON) architecture, which supports polarization multiplexing and higher-order modulation formats. The FSON architecture allows that the numerous laser sources of optical transceivers within a data center can be quasi-synchronized by means of a tree-distributed homology architecture. In conjunction with our proposed novel pilot-tone assisted Costas Loop for an analog coherent receiver, we achieve a record dual-polarization 224-Gb/s 16-QAM 5-km mismatch transmission with reset-free carrier phase recovery in the optical domain. Our proposed DSP-free analog coherent detection system based on the FSON makes it a promising solution for next-generation low-power, high-capacity coherent data center interconnects (DCI). DSP-free Coherent data center interconnects Frequency synchronous optical networks Analog signal processing Full Text Additional Declarations No competing interests reported. Supplementary Files Supplyinformation.docx Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4722695","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":335828916,"identity":"7362f1f6-7a88-4705-9af5-57c450b41ed9","order_by":0,"name":"Lei Liu","email":"","orcid":"","institution":"Westlake University","correspondingAuthor":false,"prefix":"","firstName":"Lei","middleName":"","lastName":"Liu","suffix":""},{"id":335828917,"identity":"8fa1d0a8-90ff-4eee-ac9d-7202394b77f7","order_by":1,"name":"Feng Liu","email":"","orcid":"","institution":"Westlake 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