Ribbon Hits 20 Tbps on JUNO Trans-Pacific Subsea Cable
Ribbon Achieves 20 Tbps Transmission on JUNO Trans-Pacific Submarine Cable
By Ray Sharma, The Fast Mode
November 13, 2025
Ribbon Communications, a global leader in real-time communications technology and IP optical networking solutions, announced the successful completion of a 20Tbps optical transmission field trial on the 10,000 km JUNO trans-Pacific submarine cable, developed and operated by Seren Juno.
Ribbon’s mission is to help service providers, enterprises and critical infrastructure operators worldwide modernize and secure their networks and services.
Set to become the largest trans-Pacific cable system between Japan and the U.S., JUNO will deliver more than 350Tbps of total capacity across 20 fiber pairs, supporting growing global demand for high-speed connectivity.
The trial featured Ribbon’s Apollo 9408 transponder, powered by advanced 5nm 140GBaud technology, and the Apollo 9608 platform, which integrates submarine-grade optical line system functions. The Apollo 9408 supports flexible modulation from 400Gbps to 1.2Tbps per wavelength, enabling performance optimization tailored to cable conditions. Combined with the compact, low-power Apollo 9608, Ribbon sets a new benchmark for submarine optical transmission.
Sam Bucci, EVP and COO, Ribbon
Our Apollo platform’s ability to deliver 20Tbps over 10,000 km showcases the scalability and robustness of Ribbon’s technology for next-generation global connectivity
Yoshio Sato, CEO, Seren Juno
Achieving results that rival those of leading competitors gives us confidence that this could become one of our new strategic options
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