The latest online piece from E&T magazine informs us that Facebook Engineering has developed a system for wrapping fibre optic cables around overhead power lines.
https://eandt.theiet.org/content/articles/2020/07/robot-wraps-fibre-optic-cables-around-existing-power-lines/
This technique was actually developed by Raychem in the early 1980s and since then thousands of km have been installed.
https://en.wikipedia.org/wiki/Optical_attached_cable
The product line is know owned by AFL
https://www.aflglobal.com/Products/Fiber-Optic-Cable/Aerial/Skywrap.aspx
Best regards
Roger