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Because they're glass, they can't be bent, that's why those white cartridge-like things keep each strand in coils. You'll also note that there's quite a bit coiled in the cartridge. This is to provide enough length/slack to bring the strand out to work on.
The blue bracketed device is probably the specialized fiber optic strand cutter, ie to ensure it is cut exactly 90 degrees and has a completely flat face. The ends of the 2 strands are put into the device with the orange cover. This is probably the fuser that will melt glass strands to splice the two ends together.