Colt Technology Services is extending its Colt IQ Network in the greater Dublin area with an additional 150km of 100Gbps fibre.
The company said the expansion is part of a planned €15m investment in Dublin over the next two years.
It comes in anticipation of greater demand for digital infrastructure from multinational customers based in Dublin as well as other Dublin-based customers.
The expansion will bring Colt's fibre network in the city to more than 300km.
Colt's high bandwidth currently connects over 350 enterprise buildings and 23 data centres in Dublin.
Carl Grivner, the company's chief executive, said Colt sees Dublin as being one of Europe's key growth cities in the coming years.
"With multinational investment in Ireland only likely to increase, it's crucial that Colt has the technological backbone in Ireland to support its anticipated traffic growth.
"The expansion also demonstrates our ongoing commitment to enabling the digital transformation of businesses in today's increasingly fast paced digital economy," the CEO added.