Seren Juno and Ribbon Achieve 20Tbps Transmission on 10,000 km JUNO Trans-Pacific Cable
Rhea-AI Summary
Ribbon Communications (Nasdaq: RBBN) announced a successful field trial achieving 20Tbps optical transmission over 10,000 km on the JUNO trans-Pacific submarine cable developed by Seren Juno on Nov 12, 2025. The test used Ribbon's Apollo 9408 transponder (5nm, 140GBaud) and the Apollo 9608 submarine-grade line system, demonstrating 20Tbps per fiber pair feasibility. JUNO is described as a planned 20-fiber-pair system with >350Tbps total capacity between Japan and the U.S., positioning the cable as a major long-haul route. The trial highlights Ribbon's stated capability to deliver high-speed, low-power submarine transmission and flexible per-wavelength modulation from 400Gbps to 1.2Tbps.
Positive
- Field trial reached 20Tbps over 10,000 km
- JUNO planned capacity >350Tbps across 20 fiber pairs
- Apollo 9408 uses 5nm 140GBaud technology
- Per-wavelength flexibility 400Gbps–1.2Tbps
- Apollo 9608 delivers compact, low-power submarine functions
Negative
- None.
News Market Reaction
On the day this news was published, RBBN gained 1.89%, reflecting a mild positive market reaction.
Data tracked by StockTitan Argus on the day of publication.
Set to become the largest trans-Pacific cable system between
"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
Important Information Regarding Forward-Looking Statements
The information in this release contains forward-looking statements regarding future events that involve risks and uncertainties. All statements other than statements of historical facts contained in this release, including those regarding the expected benefits from use of Ribbon Communication's products, are forward-looking statements. The actual results of Ribbon Communications may differ materially from those contemplated by the forward-looking statements. For further information regarding risks and uncertainties associated with Ribbon Communications' business, please refer to the "Risk Factors" section of Ribbon Communications' most recent annual or quarterly report filed with the SEC. Any forward-looking statements represent Ribbon Communications' views only as of the date on which such statement is made and should not be relied upon as representing Ribbon Communications' views as of any subsequent date. While Ribbon Communications may elect to update forward-looking statements at some point, Ribbon Communications specifically disclaims any obligation to do so.
Investor Contact
+1 (978) 614-8050
ir@rbbn.com
Media Contact
Catherine Berthier
+1 (646) 741-1974
cberthier@rbbn.com
About Seren Juno Network Co., Ltd.
Established in July 2022 as a joint venture between NTT Ltd. Japan Corporation, Mitsui & Co., Ltd., PC Landing Corp., and JA Mitsui Leasing, Ltd., Seren Juno Network Co., Ltd. is the owner and operator of the JUNO submarine cable system. JUNO is a next-generation trans-Pacific cable spanning approximately 10,000 km between
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SOURCE Ribbon Communications Inc.
FAQ
What did Ribbon (RBBN) announce on November 12, 2025 about the JUNO cable?
How much total capacity will the JUNO trans-Pacific cable provide?
Which Ribbon platforms powered the 20Tbps JUNO trial for RBBN?
What per-wavelength performance did Ribbon cite for the Apollo 9408?
Does the 20Tbps result show feasibility for long-haul submarine transmission for RBBN?
