this post was submitted on 06 Aug 2024
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Speed of light in fiberoptic cable is slower than c for a different reason. The light is in something close to vacuum, signals travel slower than c because the light doesn't follow a straight path, it zig zags bouncing off the walls.
A radio wave or laser in reasonable vacuum (in orbit for example) will be lower latency than a signal on a fiber link the same length
I'm expecting lower ping via starlink than fiber once starlink has laser links between satellites