This Facebook robot walks on power lines to install fiber-optic cable

Each robot will be capable of installing over a kilometre of fiber and passing the dozens of intervening obstacles autonomously in approximately an hour and a half.

To account for the human interaction steps such as setup, loading and unloading the robot, installing transitions, etc., Facebook estimates an overall build speed of 1.5 km to 2 km per robot per day on average.

"We expect the total cost, including labour, depreciation, and materials, to be between $2 and $3 per metre in developing countries," Facebook said in a statement on Monday.

The system, which utilises the electrical grid to build out internet infrastructure, will be cheaper than the existing methods of laying internet cables, particularly in developing countries.

Developed by the team at Facebook Connectivity, the system combines innovations in the fields of robotics and fiber-optic cable design.

"If successful, we believe this technology will allow fiber to effectively and sustainably be deployed within a few hundred metres of much of the world's population. We expect to see technology trials of this fiber deployment system next year," Facebook said.

Facebook has identified NetEquity Networks as the first partner to deploy this new innovative technology.

As of 2019, more than 70 per cent of the world's population lives more than 10 km from fiber.

The idea of utilizing electrical infrastructure first came to Facebook after it saw the ubiquity of electrical grid infrastructure while traveling across rural Africa.

With long transmission lines typically suspended on tall lattice towers, electrical transmission grids serve a function similar to internet backbone, connecting generation sites to substations.

From substations, power travels along MV lines into communities for distribution.

"We realized that following the same grid with fiber could be an efficient way to build an end-to-end telecommunications network. To utilize the electrical grid and lower the cost of fiber deployments, we therefore chose to focus on aerial fiber construction," said Facebook.

The size and weight of the fiber cable are the most important factors in making helical wrap cost-effective in the MV space.

To enable compatibility with the thinnest power-line conductors, Facebook chose a minimum cable capacity per robot of a little more than 1 km.

A fiber network deployed following the electric grid has a big advantage.

A fiber cable following an electric feeder will a few thousand homes per feeder, but in developing countries it can get as high as 15,000 homes per feeder.

"Through the use of suitably selected optical components, a wholesale lit service could be offered to serve all of these homes and businesses from a 24-strand fiber cable," said Facebook.

Globally, more than 3.5 billion people are still not connected to the internet. With average data usage per person growing 20 to 30 per cent annually, legacy bandwidth-limited technologies have been pushed to their capacity limits.

"While we still have a number of steps to complete before our first deployment, we have confidence that this approach will yield a substantial improvement to both the cost and speed of fiber deployments," the company added.