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Originally Posted by Jeff Root
Along the same lines of shoving light through a small hole-- Is it
possible for light to move from side-to-side at all in a mono-mode
optical fiber, or is it packed in there so tight that it can't wiggle
at all, forced to slide straight down the center?
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I think that even in a single mode fiber, the light bounces off the sides (which is why it can travel around a curve). But when dealing with these issues and designing such cables, they use classical electrodynamics. That is, the light is behaving very much like a wave in this case, and not very much like individual particles.