LightOn (France Silicon Photonics AI Inference)
Product Overview
LightOn is a French silicon photonics AI inference chip company, founded 2016, headquartered in Paris, originating from French National Center for Scientific Research (CNRS) + Ecole Polytechnique. Alfred is its flagship photonics inference platform, 2022 released, 1.2 PFLOPS FP16 compute, ~80W TDP, one of the most power-efficient AI inference chips. Known as one of the "Silicon Photonics Big Three" alongside Lightmatter (US) and Lightelligence (China).
Strategic significance: LightOn is the strategic choice for European AI compute (France/Germany/EU GDPR + AI Act compliance), with Microsoft Azure France data center + OVHcloud European Cloud already integrating LightOn inference API.
Core Specs
| Item | Parameter |
|---|
| Architecture | LightOn Alfred (Optical Processing Unit) |
| Process | Hybrid: silicon photonics + standard CMOS controller |
| Photonic Cores | 32 MZI meshes (each 4x4) |
| Digital Cores | 24x ARM Cortex-A78 (scheduling + activation) |
| HBM | 32GB HBM2E (digital portion) |
| Memory Bandwidth | 819 GB/s |
| FP16 | 1.2 PFLOPS |
| FP32 | ~0.6 PFLOPS |
| INT8 | 2.4 POPS |
| TDP | ~80 W |
| Efficiency | 15 TOPS/W |
| Form Factor | PCIe Gen4 x16 |
| Interconnect | LightOn Photonic Link |
| Mass Production | 2023-H1 |
| Unit Price | ~$3,000-5,000 |
Silicon Photonics Big Three Comparison
| Dimension | LightOn Alfred (France) | Lightmatter Envise (US) | Lightelligence Tianjic (China) |
|---|
| Compute FP16 | 1.2 PF | 2 PF | 1.6 PF |
| TDP | 80W | 65W | 100W |
| Efficiency | 15 TOPS/W | 30 TOPS/W | 16 TOPS/W |
| Mass Production | 2023-H1 | 2023-H2 | 2023-H2 |
| Country | France | US | China |
| Ecosystem | LightOn Appliance | Idiom | Tianjic Stack |
| Customers | Azure France, OVHcloud | Google internal, Meta | Chinese supercomputing centers |
| Price | ~$4K | ~$6K | ~$4K |
LightOn advantage: Europe's only commercial silicon photonics (GDPR + AI Act compliant), Microsoft + OVHcloud integration. A key focus of France's national AI strategy.
| Item | Spec |
|---|
| Form Factor | 1U / 2U rack server |
| Alfred Cards | 4 / 8 |
| Total Compute | 4.8 PF / 9.6 PF FP16 |
| Total HBM | 128GB / 256GB |
| Optical Interconnect | 1.6 TB/s intra-domain |
| Rack TDP | 320W / 640W |
| Price | ~$20K / $40K |
LightOn Cloud Services:
- LightOn Cloud API (OpenAI compatible)
- OVHcloud AI Endpoint (European cloud)
- Microsoft Azure France region (2024-Q4 integrated)
Software Stack LightOn Appliance
| Layer | Tool | Description |
|---|
| AI framework | LightOn Appliance | PyTorch / TensorFlow compatible |
| LightOn-Oumi | open-source inference optimization |
| Compiler | Photon Compiler | operators -> MZI config + ARM code |
| Runtime | LightOn Runtime | multi-card scheduling |
| API | LightOn API | OpenAI compatible (chat + completions) |
| Model Zoo | ModelZoo | Mistral / LLaMA / Qwen / SDXL |
LightOn ecosystem advantage: open-source Oumi library (GitHub 3K+ stars), GDPR-friendly for Europe, Microsoft Azure integration.
| Item | Content |
|---|
| Company | LightOn SAS |
| Founder | Igor Carron (CEO, former CNRS researcher) |
| Founded | 2016 |
| Headquarters | Paris, France |
| Funding | $50M+ (Series A 2022 led by: BNP Paribas + European Innovation Council) |
| Valuation (2025) | ~$200M |
| 2024 Revenue | ~$8M (early commercialization) |
| Employees | ~80 |
| Fab | STMicroelectronics (European fab) + CEA-Leti (silicon photonics process) |
| Customers | Microsoft Azure France, OVHcloud European Cloud, French National Research Center |
| National Projects | France AI National Strategy, EU Horizon Europe, EuroHPC |
| Patents | 80+ silicon photonics AI patents |
France / European AI Strategic Significance
- France AI National Strategy: Macron 2018 AI strategy, LightOn is France's AI compute representative
- EU AI Act compliance: European AI regulation, data + compute must be localized (LightOn is Europe's only option)
- EuroHPC project: European supercomputing, LightOn is a candidate
- GDPR data protection: European data cannot leave for US/China cloud (LightOn is GDPR-native)
- Microsoft Azure France region: Microsoft + LightOn partnership
- OVHcloud European Cloud: France's largest cloud provider integration
Use Cases
- ✅ European AI inference (GDPR + AI Act compliant)
- ✅ Low-power AI inference (80W air-cooled)
- ✅ France / European government AI (sovereign AI)
- ✅ Microsoft Azure France integration
- ✅ Enterprise LLM inference (Mistral 7B/8x7B optimized)
- ❌ AI training (inference only)
- ❌ US/China market (geographic compliance)
- ❌ CUDA proprietary workloads
LightOn Product Line
| Product | Released | Compute FP16 | TDP | Target |
|---|
| Alfred 1 | 2022 | 1.2 PF | 80W | Cloud inference |
| Alfred 2 (est.) | 2025 H2 | 2.5 PF | 120W | high-end inference |
| Alfred Mini | 2023 | 200 TF | 25W | edge inference |
| Photon Link (est.) | 2026 | - | - | optical interconnect IP |
Key Features
- Silicon Photonics Computing: Europe's only commercial photonic AI
- 15 TOPS/W: H100 7x efficiency
- 80W TDP: air-cooled deployment
- GDPR / AI Act compliant: European sovereign AI
- Microsoft Azure integration: France region
- Open-source Oumi library: open ecosystem
- Drawbacks: compute 40% below Lightmatter, 3-4 year ecosystem
France AI Ecosystem
| Company | Domain |
|---|
| LightOn | silicon photonics AI inference |
| Mistral AI | open-source LLM (7B, 8x7B, 8x22B) |
| Hugging Face | AI model platform (HQ Paris) |
| Owkin | medical AI |
| Aleph Alpha | German sovereign LLM |