Transcelestial Space Laser Communication Terminals

Transcelestial is a Singapore laser communications company that builds wireless optical links as an alternative to fibre and radio. It started with the CENTAURI terrestrial laser terminals used by telcos and ISPs, reporting more than 150 laser networks deployed and 10+ telco customers, and is extending the same technology into space to create a laser-based network between satellites and the ground.

The space line includes an inter-satellite laser terminal (4.9 kg, 80 mm aperture, 10 Gbps at 2,000 km and 1 Gbps at 8,000 km), a 1.1 kg 1U downlink terminal rated at 10 Gbps over 500 to 1,500 km, and the TMOGS mobile optical ground station with a 355 to 500 mm aperture. Customers can run a private LAN mode mesh for sovereign and defence use, a cloud mode that links undersea-cable and AWS, Azure or GCP capacity into orbit, or host a ground station as a revenue-sharing network partner. Buyers include satellite builders, space agencies and telecom operators.

• Inter-satellite laser terminal: 4U internal and 1U external, 10 Gbps at 2,000 km and 1 Gbps at 8,000 km.
• Downlink terminal: 1U, 1.1 kg, 10 Gbps downlink and 100 Mbps uplink.
• TMOGS ground station: mobile weatherproof optical station with 10 Gbps downlink and 1 Gbps uplink.
• LAN mode: private, physically separated space mesh for sovereign and defence users.
• Cloud mode: routes undersea-cable and multi-cloud capacity through orbit.
• Terrestrial CENTAURI terminals: 10G, 25G and CENTAURI+ links up to 40 Gbps for fibre-free backhaul.

• Vietnamese satellite programmes and integrators adding high-speed optical downlinks to new Earth observation satellites.
• Telecom operators hosting optical ground stations as network partners to carry satellite and cloud traffic.
• Mobile operators connecting island, mountain and rural sites with CENTAURI laser backhaul where fibre is unavailable.

• High-capacity optical links up to 10 Gbps between satellites and to the ground, beyond typical radio downlink rates.
• Compact terminals (1U downlink at 1.1 kg) that fit small satellites and constellations.
• Laser beams are narrow and hard to intercept, supporting sovereign and defence networks without radio spectrum licensing constraints.
• Ground network partner model lets operators host a TMOGS station and share up to 50% of revenue.

Earth observation and communication constellations generate more data than radio downlinks can carry, so optical inter-satellite and space-to-ground links are becoming standard. Southeast Asian governments are investing in national space programmes and sovereign connectivity, while telcos in the region use laser links to extend 5G and rural coverage where fibre is costly.

Headquartered in Singapore. Raised a USD 9.7 million Series A3 round with NTT Finance, Paspalis, MPower Partners, Seeds Capital and Kickstart Ventures (2025). The 6G StarLab mission launched on SpaceX Transporter-15 in November 2025; inter-satellite mission with ST Engineering supported by Singapore's OSTIn. Partners include Gilmour Space, HEX20, Open Cosmos, Axiom Space and ISRO; terrestrial customers include Globe Telecom.