ZBLAN, a high quality optic fibre, can be made in space with fewer defects. A process that is in the process of being exploited. Though the rather limited spac

ZBLAN, a high quality optic fibre, can be made in space with fewer defects. A process that is in the process of being exploited. Though the rather limited space on the ISS and its imminent decommissioning complicate that a bit. I think the current plan is to launch satellites for commercial production