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A comprehensive technical and industrial breakdown of Meta’s 1 Pbps Petal cable connecting the United States and France—marking the first commercial deployment of 2-core multi-core fiber at transoceanic scale.
1. The News: Unlocking Petabit Scale Across the Atlantic
Meta has officially announced Petal, a landmark 7,000-kilometer (4,300 miles) transatlantic submarine cable system connecting the United States directly to the Atlantic coast of France. Target Ready-for-Service (RFS) in 2029, Petal represents the single largest generational leap in transoceanic cable capacity in subsea telecom history.
Petal will deliver 1 Petabit per second (1 Pbps / 1,000 Tbps) of total design capacity—doubling the bandwidth of existing 24 fiber-pair systems (such as Meta’s flagship Anjana) without requiring a proportional increase in physical cable size or shore power consumption.
2. Key System Specifications
| System Metric | Petal Technical Specification |
|---|---|
| System Length & Route | ~7,000 km (~4,300 miles) direct link from the United States to France (Atlantic Coast). |
| Total System Capacity | 1 Petabit per second (1 Pbps / 1,000 Tbps). |
| Fiber Architecture | 24 Fiber Pairs utilizing 2-Core Multi-Core Fiber (MCF) (Equivalent to 48 spatial fiber pairs / 96 spatial cores). |
| Developer & Operator | Meta Platforms (100% Private Hyperscaler Build). |
| Turnkey System Supplier | NEC Corporation (Turnkey wet-plant design, repeaters, and installation). |
| Optical Fiber Manufacturer | Sumitomo Electric Industries ("2C Z-PLUS ULL Fiber"). |
| Landing & Backhaul Partner | Orange (French landing station & European terrestrial backhaul). |
| Target Ready-for-Service (RFS) | 2029. |
3. Industrial Suppliers & Key Partners
Building a petabit-class transoceanic system required a complete redesign of the subsea manufacturing and engineering ecosystem across three core partners:
NEC Corporation (Turnkey Supplier)
Responsible for overall system design, optical repeater engineering, wet-plant manufacturing, and ocean installation. NEC engineered the single-body 96-amplifier repeater and overall 2-core Spatial Division Multiplexing (SDM) system architecture.
Sumitomo Electric (Fiber Innovation)
Supplies the "2C Z-PLUS ULL" ultra-low-loss 2-core fiber strands. Sumitomo succeeded in embedding two independent light-guiding cores inside a standard 125 µm outer cladding diameter with practically immeasurable crosstalk.
Orange (Landing & Backhaul)
Acts as the landing partner on France's Atlantic coast, managing Cable Landing Station (CLS) operations, environmental permitting, and direct optical backhaul into major European data center markets.
4. Technical Breakthroughs: Engineering the Multi-Core Ecosystem
Historically, scaling subsea capacity meant adding more physical fiber pairs within a cable. However, pushing beyond 24 fiber pairs introduces severe mechanical handling, physical weight, and electrical power limitations. Petal solves this via three key engineering innovations:
- 1. 2-Core Multi-Core Fiber (MCF) at Scale
Rather than thickening the cable to house 48 physical fiber pairs, Petal packs two distinct light-guiding cores inside each fiber strand while retaining the industry-standard 125 $\mu$m outer diameter. This preserves standard cable manufacturing, armored protection, and shipboard handling techniques while doubling spatial capacity.
- 2. Single-Body 96-Amplifier Repeater with FIFO Interfaces
A 7,000 km route requires approximately 100 subsea repeaters to boost optical signals. To amplify 96 spatial cores within a single repeater housing, NEC integrated Fan-In/Fan-Out (FIFO) optical interfaces. Inside each repeater, FIFO splits the 2-core fiber into two single-core paths for highly efficient single-core amplification before recombining them back into 2-core fiber upon exiting.
- 3. Power Feeding Efficiency (18 kV Boundary)
By combining high-efficiency SDM pump-sharing repeaters with low-loss Sumitomo fiber, Petal stays within existing 18-kilovolt (kV) Power Feeding Equipment (PFE) ratings. This avoids the multi-year engineering and safety requalification required for ultra-high voltage shore power systems.
5. Strategic Significance for Global AI & Network Architecture
Petal moves multi-core fiber out of academic laboratories and into mainstream commercial subsea deployment. By establishing a proven 2-core supply chain, Meta is creating an open technical blueprint that the entire subsea cable industry can adopt for future ocean-crossing builds.
Generative AI training models and distributed GPU clusters require massive data replication across continents. Delivering 1 Pbps enables real-time synchronization of massive neural networks and hyperscale availability zones between the U.S. and Europe.
6. Meta’s Subsea Cable Portfolio & Transatlantic Evolution
Meta has emerged as one of the world's largest private investors in submarine cable infrastructure, having backed over 20 global subsea systems—including flagship projects like 2Africa (45,000+ km around Africa), Project Waterworth (50,000+ km multi-ocean build), Candle (APAC), and Malbec (South America).
On the strategic North Atlantic corridor, Petal marks the culmination of an aggressive three-phase capacity evolution:
| Cable System | RFS Year | Transatlantic Route | Fiber Architecture | Capacity Impact |
|---|---|---|---|---|
| Marea | 2018 | Virginia Beach (US) → Bilbao (Spain) | 8 Fiber Pairs (Legacy SDM) | ~200 Tbps (Meta's first private transatlantic investment). |
| Amitié | 2023 | Massachusetts (US) → Le Porge (France)/ Bude (United Kingdom) | 16 Fiber Pairs | 320 Tbps |
| Anjana | 2025 | Myrtle Beach (US) → Santander (Spain) | 24 Single-Core Fiber Pairs | ~500 Tbps (World's first transoceanic 24 FP system). |
| Petal | 2029 | United States → France (Atlantic Coast) | 24 Pairs / 2-Core MCF (48 FP Equiv.) | 1,000 Tbps (1 Pbps) — 5.5x Marea's capacity. |
Meta’s Petal system establishes a new technological era in subsea infrastructure. By successfully industrializing 2-core multi-core fiber alongside NEC, Sumitomo Electric, and Orange, Petal doubles transoceanic data pipelines to 1 Petabit per second—setting the benchmark for AI-era undersea connectivity.
