No. The core has to be denser than the outside for the guiding to work; if you m...

lmm on June 10, 2015 | parent | context | favorite | on: Musk files to provide Internet service from space

No. The core has to be denser than the outside for the guiding to work; if you made a "fiber" like you describe the signal would just travel through the sheath - if it was heading towards the core it would internally reflect to stay within the sheath.