Dark fibre between two sites in France: who to ask
Dark fibre gives you a dedicated optical pair that you light yourself, with no bandwidth cap. In France, its availability depends mostly on what already exists along the route between your two points.
Estimate my cost →What dark fibre changes #
It is fibre rented unlit by the carrier: you install your own equipment and get private, scalable capacity with no sharing. You reach for it when standard managed links no longer suffice, on bandwidth or on confidentiality.
Who to ask in France #
Three families: national infrastructure carriers, public-initiative networks (RIP) run by local authorities, and specialised dark-fibre operators. Depending on the route, one of them will already have fibre available.
Lead times and costs #
If fibre already exists along the route, lead time is short and cost is contained. If civil-works are needed, lead time runs into months and cost climbs. Price depends on distance, the number of points to connect and the existing infrastructure: only a quote on the exact route gives a figure.
Dark fibre or a managed link #
A managed Ethernet link is lit and run by the carrier, with an SLA and a defined speed. Dark fibre has no bandwidth cap and stays private, but assumes your own equipment and operations. And once the fibre is leased, it still has to be lit: our CWDM and DWDM guide calculates how many 10G and 100G links it can carry, and how far.
FAQ #
No. It depends on the infrastructure already in place along the route. Eligibility and lead time are confirmed by quote, route by route.
Transponders, and a WDM/DWDM system to multiply channels. It is sized to the target bandwidth and the distance.
Written on 1 September 2026.
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