Deployment of the industrialised Multi-branch Laser System (MLS)

We are happy to share some early results on the ongoing improvements to the REFIMEVE network.

We are accelerating the deployment of the industrialised MLS (Multi-branch Laser System) across the network. The first installation of the industrialised MLS took place on the TH2 Paris datacenter during the week of May 6–7, 2025. Initial observations are promising, showing significant improvements in both stability, accuracy and reliability for the national links of REFIMEVE.

We are demonstrating an order of magnitude gain in long-term stability of the frequency transfer compared to before, by compensating internal optical paths in the new MLS. The figure above shows the stability limit of the TH2 Paris Multibranch Laser Station.

We expect further enhancements, especially in terms of uptime, across long-haul links throughout the network.

Multibranch frequency transfer laser station allowing the transfer on 6 links with state of the art performances (© Grégoire Coget Exail)

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