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Made the title give a clue as to the subject matter. (It would have been obvious to the OP if s/he had looked at a light through the fibre.)
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Transistor
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I wonder what these fibre-optic cables are used for

One cord. Two identical ends. Looks like female end would be similar to a phone style connection but it is not for phone.   

enter image description here Black

Black cord, two ends identical

I wonder what these are used for

One cord. Two identical ends. Looks like female end would be similar to a phone style connection but it is not for phone.  enter image description here Black cord, two ends identical

I wonder what these fibre-optic cables are used for

One cord. Two identical ends. Looks like female end would be similar to a phone style connection but it is not for phone. 

enter image description here

Black cord, two ends identical

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I wonder what these are used for

One cord. Two identical ends. Looks like female end would be similar to a phone style connection but it is not for phone. enter image description here Black cord, two ends identical