CUMEC's heterogeneous TFLN-on-silicon-photonics: ~100 GHz modulators, 0.1 dB vertical couplers
jwt0625 · x · 2026-09-26
A technical review of CUMEC's 8-inch heterogeneous integration of thin-film lithium niobate on active silicon photonics (Wu2026): TiN etch-stop layers define bonding trenches; EO modulators hit 100 GHz 3dB bandwidth with PDs around 50 GHz; fat LN waveguides make modulators long; vertical couplers achieve just 0.1 dB IL while edge couplers lag at 1.6 dB. The author also wonders about CUMEC's monthly wafer output.
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