Silicon Chips Get Fiber‑Optic Speed: Caltech’s Ultra‑Low‑Loss Light Paths

Caltech researchers have taken a big step toward making computer chips handle light as efficiently as glass fiber cables. By carving ultra‑smooth, ultra‑low‑loss optical waveguides directly onto silicon, they have created pathways that let light travel with almost no loss at visible wavelengths—something previously only possible in expensive fiber‑optic strands. The new silicon‑based routes are not only comparable to fiber in efficiency, they also beat the performance of existing on‑chip light guides, opening the door to a host of practical applications. What does this mean for everyday technology? Imagine data centers that use far less electricity because information can zip through light instead of electricity, or tiny, chip‑scale lasers that power next‑generation medical sensors, atomic clocks, and quantum computers. The breakthrough is the result of five years of steady progress, and the team says it’s just the beginning. Future work aims to push the loss even lower and integrate these waveguides with other chip components, paving the way for faster, greener, and more powerful electronic devices.

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