Vocus says the new 35km fibre path installed between Edinburgh Parks and Adelaide Airport will deliver an increased fibre capacity boost and critical diversity for SABRENet's research, education and innovation customers.

"It will also allow Vocus to provide additional diverse network services to customers in Adelaide," Vocus said.

The expanded network footprint offers high-speed connectivity to schools, startups, universities, research institutes and innovation precincts across the state.

SABRENet supports innovation through more than 650 businesses as part of the GigCity Adelaide Program, a South Australian government initiative that delivers high-speed internet to designated innovation precincts across Adelaide.

The SA Department for Infrastructure and Transport provided access to underground ducts along Adelaide's Northern Connector route, reducing construction costs.

Vocus Chief Customer Officer Matt Walsh said the SABRENet expansion forms part of the company's ongoing investment in fibre as the critical enabler of Australia's digital economy.

"Vocus is deeply committed to collaborating with industry to build the essential infrastructure that powers Australia's digital future," Walsh said.

"Across the country, Vocus delivers the high-capacity fibre that enables smart cities, powers research and innovation, and helps our regions realise their economic potential."

SABRENet CEO Sandra Vallance said the new fibre path will provide a platform for innovation across Adelaide.

"With this new fibre capacity, we're able to offer customers in our innovation precincts diverse access to true gigabit internet starting at just $49.90 a month for micro businesses," said Vallance.

"This gives Adelaide a major competitive advantage in attracting talent and nurturing new industries."

Vocus and SABRENet share access to the expanded fibre footprint under a long-term partnership established in the early 2000s.

The expansion was delivered in collaboration with the South Australia Department for State Development, the South Australia Department for Infrastructure and Transport, Trenchless Pipelaying Contractors (TPC) and EDC Expert Group.