400G

High-performance 400G optics engineered for scalable, high-density cloud and AI networks.
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Reliable 400G connectivity for modern hyperscale and switching architectures.

Engineered for consistency, validated for performance.

Each product in this family is built on ATOP’s unified design platform, tested in our interoperability labs, and manufactured with full traceability from component to final module. Select a product to view detailed specifications, compliance data, and test documentation.
Broad form factor coverage
QSFP-DD, OSFP, and QSFP112 options with FR4, DR4, SR8, and SiPh architectures.
High-capacity optical reach
Supports transmission distances up to 2 km with strong signal integrity.
Optimized for dense switching
Low power and high thermal stability for modern 400G Ethernet fabrics.
ATOP’s 400G transceiver portfolio delivers high-performance, hot-pluggable optical modules designed for cloud, AI, and hyperscale data center environments. Supporting QSFP-DD, OSFP, and QSFP112 form factors across FR4, DR4, SR8, and Silicon Photonics variants, these modules enable data rates up to 425 Gb/s with reach options up to 2 km. Engineered for low power consumption, stable thermal behavior, and consistent interoperability, ATOP’s 400G solutions provide a dependable foundation for high-bandwidth Ethernet deployments.

Performance Profile: Scalable Bandwidth for Cloud and AI Infrastructure

ATOP’s 400G modules deliver the efficiency, performance, and interoperability needed for next-generation data center architectures.
425 Gb/s optical engines
Designed for continuous operation in dense 400G deployments.
Engineered for stable high-speed throughput across diverse reach requirements.
Interoperability at scale
Thermal and power efficiency
Validated across multi-vendor switching ecosystems and modern Ethernet standards.

ATOP combines advanced engineering, intelligent manufacturing, and rigorous interoperability testing to deliver reliable, scalable connectivity for the world’s most demanding networks.

ATOP’s 400G solutions extend our advanced optical engineering into a flexible portfolio built for cloud-scale switching and high-performance AI environments.

Manufacturing Excellence
R&D & Silicon Photonics
Testing & Interoperability
ESG & Transparency

Intelligent 4.0 Manufacturing, Built for Scale

ATOP designs, builds, and validates every module in its own advanced 4.0 manufacturing facilities.
Automated Optical Assembly
High-precision robotic alignment and packaging for consistent optical performance.
Full Production Traceability
Serial-level tracking from components to final testing in a unified internal system.
High-Volume Reliability
Scalable, repeatable production optimized for enterprise and hyperscale demand surges.
ATOP’s vertically integrated production enables unmatched control over quality, reliability, and speed. Our intelligent manufacturing platform includes automated optical packaging, precise alignment systems, high-throughput assembly, and full line-level robotics. Combined with rigorous in-house validation and continuous data monitoring, this ensures every unit meets the highest performance standards demanded by AI, cloud, and hyperscale deployments.

Deep Engineering Across Optics, Silicon, and Systems

ATOP’s R&D teams integrate DSP, SiPh, packaging, and thermal expertise to deliver next-generation optical performance.
Silicon Photonics Integration
Next-gen SiPh platforms engineered for lower power and improved thermal efficiency.
Advanced DSP Algorithms
Equalization, PAM4 optimization, and signal correction tuned for hyperscale networks.
Thermal & Structural Modeling
Comprehensive simulation to ensure stable performance across extreme operating conditions.
Our innovation pipeline spans system-level architecture, advanced DSP algorithms, silicon photonics development, thermal modeling, and high-speed electrical design. Working with cutting-edge 5 nm DSP platforms and integrated SiPh engines, ATOP engineers optimize every component from modulation to packaging. This holistic approach ensures better signal integrity, lower power consumption, and long-term reliability across all product families.

Validated for Real-World Networks

ATOP operates independent, vendor-neutral labs to guarantee interoperability with the industry’s leading switches and systems.
Multi-Vendor Compatibility
Validated against real hardware from NVIDIA, Cisco, Broadcom, and other ecosystem leaders.
Environmental Stress Testing
Thermal cycling, humidity, vibration, and extended burn-in for maximum reliability.
Full Standards Compliance
IEEE, OIF, and MSA-aligned testing workflows for stable enterprise and hyperscale deployment.
Our global testing facilities perform continuous validation against multi-vendor switch platforms, environmental stress scenarios, heat-soak chambers, and high-density configurations. Every module undergoes electrical, optical, and firmware-level testing aligned with IEEE, CMIS, OIF, and MSA standards. This ensures consistent behavior, minimal downtime, and predictable performance in production-scale environments.

Sustainable, Traceable, and Globally Resilient

ATOP offers full ESG transparency, per-product carbon data, and multi-region manufacturing for resilient supply chains.
Per-Product Carbon Data
Lifecycle reporting aligned with global ESG frameworks and customer compliance needs.
Certified Materials
Strict sourcing standards for optical components, PCBs, and copper assemblies.
Multi-Region Manufacturing
Geographically diverse production to minimize risk and improve supply assurance.
As a manufacturer, ATOP provides complete insight into material sourcing, lifecycle impact, and compliance. Our products include per-unit carbon reporting, and our procurement standards mandate certified, ethically sourced components. 

With multi-region production in China and Malaysia, we ensure stable delivery even under global constraints while supporting the sustainability expectations of enterprise and hyperscale customers.

Intelligent 4.0 Manufacturing, Built for Scale

ATOP designs, builds, and validates every module in its own advanced 4.0 manufacturing facilities.
Automated Optical Assembly
High-precision robotic alignment and packaging for consistent optical performance.
Full Production Traceability
Serial-level tracking from components to final testing in a unified internal system.
High-Volume Reliability
Scalable, repeatable production optimized for enterprise and hyperscale demand surges.
ATOP’s vertically integrated production enables unmatched control over quality, reliability, and speed. Our intelligent manufacturing platform includes automated optical packaging, precise alignment systems, high-throughput assembly, and full line-level robotics. Combined with rigorous in-house validation and continuous data monitoring, this ensures every unit meets the highest performance standards demanded by AI, cloud, and hyperscale deployments.

Deep Engineering Across Optics, Silicon, and Systems

ATOP’s R&D teams integrate DSP, SiPh, packaging, and thermal expertise to deliver next-generation optical performance.
Silicon Photonics Integration
Next-gen SiPh platforms engineered for lower power and improved thermal efficiency.
Advanced DSP Algorithms
Equalization, PAM4 optimization, and signal correction tuned for hyperscale networks.
Thermal & Structural Modeling
Comprehensive simulation to ensure stable performance across extreme operating conditions.
Our innovation pipeline spans system-level architecture, advanced DSP algorithms, silicon photonics development, thermal modeling, and high-speed electrical design. Working with cutting-edge 5 nm DSP platforms and integrated SiPh engines, ATOP engineers optimize every component from modulation to packaging. This holistic approach ensures better signal integrity, lower power consumption, and long-term reliability across all product families.

Validated for Real-World Networks

ATOP operates independent, vendor-neutral labs to guarantee interoperability with the industry’s leading switches and systems.
Multi-Vendor Compatibility
Validated against real hardware from NVIDIA, Cisco, Broadcom, and other ecosystem leaders.
Environmental Stress Testing
Thermal cycling, humidity, vibration, and extended burn-in for maximum reliability.
Full Standards Compliance
IEEE, OIF, and MSA-aligned testing workflows for stable enterprise and hyperscale deployment.
Our global testing facilities perform continuous validation against multi-vendor switch platforms, environmental stress scenarios, heat-soak chambers, and high-density configurations. Every module undergoes electrical, optical, and firmware-level testing aligned with IEEE, CMIS, OIF, and MSA standards. This ensures consistent behavior, minimal downtime, and predictable performance in production-scale environments.

Sustainable, Traceable, and Globally Resilient

ATOP offers full ESG transparency, per-product carbon data, and multi-region manufacturing for resilient supply chains.
Per-Product Carbon Data
Lifecycle reporting aligned with global ESG frameworks and customer compliance needs.
Certified Materials
Strict sourcing standards for optical components, PCBs, and copper assemblies.
Multi-Region Manufacturing
Geographically diverse production to minimize risk and improve supply assurance.
As a manufacturer, ATOP provides complete insight into material sourcing, lifecycle impact, and compliance. Our products include per-unit carbon reporting, and our procurement standards mandate certified, ethically sourced components. 

With multi-region production in China and Malaysia, we ensure stable delivery even under global constraints while supporting the sustainability expectations of enterprise and hyperscale customers.

Solutions Powered by This Technology

Engineered for consistency, validated for performance.

Explore how this product family supports real-world architectures across AI, cloud, and hyperscale data centers. These solutions highlight practical deployment patterns where ATOP’s manufacturing, optical design, and interoperability capabilities deliver measurable performance and reliability gains.

400G Products in This Category

Reliable, fully traceable optical modules engineered for high-performance data center and AI applications.

Representative Solutions, Not an Exhaustive List

The products shown here highlight common configurations within this category. ATOP’s portfolio spans multiple variants, reaches, platforms, and deployment scenarios, including options not publicly listed.
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