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Microwave photonic technology is highly promising; however, its practical applications have so far been limited by the complexity of existing system architectures. Here, we demonstrate an optically locked low-noise photonic microwave oscillator, in which all the optical components are packaged within a small module of 166\u00a0mL; low noise microwave generation is achieved at 10.4\u00a0GHz with single-sideband phase noise of \u221254\u00a0dBc\/Hz at 10\u00a0Hz, \u2212141\u00a0dBc\/Hz at 10\u00a0kHz, and \u2212162\u00a0dBc\/Hz at 10\u00a0MHz offset. The above performance arises from a dual-laser self-injection-locking scheme to a single Fabry\u2013P\u00e9rot cavity with high Q exceeding 108, with &amp;gt;20\u00a0dB common-mode noise suppression. The low-noise nature of this reference is coherently transferred to the X-band through a high-performance thin-film lithium niobate (TFLN) electro-optic comb chip, thereby overcoming long-standing barriers in photonic microwave integration to enable truly field-deployable low-noise microwave generation.<\/jats:p>","DOI":"10.1093\/nsr\/nwag135","type":"journal-article","created":{"date-parts":[[2026,3,14]],"date-time":"2026-03-14T12:37:59Z","timestamp":1773491879000},"source":"Crossref","is-referenced-by-count":3,"title":["Optically locked low-noise photonic microwave oscillator"],"prefix":"10.1093","volume":"13","author":[{"given":"Zexing","family":"Zhao","sequence":"first","affiliation":[{"name":"National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, College of Engineering and Applied Sciences, School of Physics, Research Institute of Superconductor Electronics (RISE) & Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE, Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Li","sequence":"additional","affiliation":[{"name":"National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, College of Engineering and Applied Sciences, School of Physics, Research Institute of Superconductor Electronics (RISE) & Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE, Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kunpeng","family":"Jia","sequence":"additional","affiliation":[{"name":"National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, College of Engineering and Applied Sciences, School of Physics, Research Institute of Superconductor Electronics (RISE) & Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE, Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenye","family":"Qin","sequence":"additional","affiliation":[{"name":"National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, College of Engineering and Applied Sciences, School of Physics, Research Institute of 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