This article includes a passage about fiber optic threads made on the ISS. About 7 miles worth. They are said to be superior to the ones made on the ground. Can you imagine the cost per foot of such fiber optic threads?
https://spaceexplored.com/2024/04/3...ay-for-boeing-starliners-first-crewed-flight/
https://spaceexplored.com/2024/04/3...ay-for-boeing-starliners-first-crewed-flight/