Seren Juno and Ribbon achieve 20 Tbit/s transmission on 10,000 km Juno transpacific cable

Plano, TX – Ribbon Communications Inc. (Nasdaq: RBBN), a global leader in real-time communications technology and IP optical networking solutions, today 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.

“This is a significant milestone in long-haul optical networking, confirming the feasibility of transmitting 20 terabits per second per fiber pair,” said Sam Bucci, Ribbon 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.”

“Achieving results that rival those of leading competitors gives us confidence that this could become one of our new strategic options,” said Yoshio Sato, CEO, Seren Juno.

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.

About Ribbon

Ribbon Communications (Nasdaq: RBBN) delivers secure cloud communications and IP and optical networking solutions to service providers, enterprises and critical infrastructure sectors globally. We engage deeply with our customers, helping them modernize their networks for improved competitive positioning and business outcomes in today's smart, always-on and data-hungry world. Our end-to-end portfolio of communications software and IP Optical networking solutions delivers superior value and innovation by leveraging cloud-native architectures, automation and analytics tools, and leading-edge security. We maintain a keen focus on our commitments to Environmental, Social, and Governance (ESG) matters, offering an annual Sustainability Report to our stakeholders. To learn more about Ribbon, please visit rbbn.com