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Magnet-free linear electro-optic isolator on a lithium niobate photonic chip directs unidirectional light flow and protects laser sources

https://phys.org/news/2026-07-highly-tunable-electro-optic-isolator.html "scaling co-packaged optics, silicon photonics foundries, high-density laser integration requires: bulky magnets non-integrable with CMOS fabrication, introducing significant optical loss... overcome emulating atomic Autler–Townes splitting, establishing controlled non-reciprocal coupling between optical modes without moving parts/ acoustic waves... approximately 33 dB isolation contrast alongside multi-THz operating wavelength tunability in telecom band... compact, low-power optical signal routing"
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On-chip electro-optic non-reciprocal isolator prevents optical reflections from damaging laser sources, without bulky external magnets

https://www.eurekalert.org/news-releases/1137523 "standard foundry process compatible, uses active electro-optic phase modulation rather than magneto-optic effects, breaks optical reciprocity within micro-scale footprint... dynamically controls directional optical transmission: forward-propagating signals pass unimpeded/ destabilizing back-reflections suppressed across broad spectrum... high-density co-packaged optics and silicon photonics"
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