What is the Transmission Distance of OSFP-1.6T-2xDR4?
OptechTWIntroduction: The Next Leap in Bandwidth
The demand for ultra-high-speed data transmission in AI training clusters and cloud infrastructure is pushing data center networks beyond 800G. One of the most promising solutions emerging is the OSFP-1.6T-2xDR4 optical module, which enables 1.6 Terabits per second over two 800G DR4 interfaces. But how far can this module transmit data reliably?
What Is OSFP-1.6T-2xDR4?
The OSFP-1.6T-2xDR4 module is a cutting-edge transceiver designed for next-generation switch and server interconnects. It features:
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Form Factor: OSFP
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Line Rate: 2 × 800G (DR4)
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Connector: 2 × MPO-12
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Modulation: PAM4
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Application: AI/ML clusters, high-density data centers, top-of-rack to spine connectivity
Transmission Distance of OSFP-1.6T-2xDR4
Standard Reach
The OSFP-1.6T-2xDR4 leverages two 400G-DR4 lanes per side, each designed for 500 meters over single-mode fiber (SMF). Therefore:
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Total reach per 800G DR4 link: Up to 500m
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Total logical reach (2 DR4 paths): Both links can operate independently over 500m
This makes the module suitable for short-to-medium reach applications, including rack-to-rack or row-to-row connections within modern data centers.
Use Cases and Applications
Ideal for AI and HPC Clusters
The OSFP-1.6T-2xDR4 module is tailor-made for AI workloads, especially in GPU-heavy architectures using NVIDIA H100 or H200, where high bandwidth and low latency are mission-critical.
Scalable for Future Networks
With double the capacity of 800G modules and support for simplified cabling (no breakout needed), it supports rapid scaling to 100,000+ port networks with better density and lower power per Gbps.
OSFP-1.6T-2xDR4 vs. Other 1.6T Options
| Feature | OSFP-1.6T-2xDR4 | OSFP-1.6T-LR8 | OSFP-800G-2xFR4 |
|---|---|---|---|
| Line Rate | 2×800G DR4 | 8×200G LR | 2×400G FR4 |
| Reach | 500m | 10km | 2km |
| Connector | 2×MPO-12 | 1×LC duplex | 2×LC duplex |
| Use Case | Short-reach AI | Long-haul DCI | Rack-to-rack |
Final Thoughts: 1.6T is the Future
With the growth of AI-driven workloads, hyperscalers and data center operators are turning to 1.6T OSFP modules for the next generation of optical interconnects. The OSFP-1.6T-2xDR4 module strikes the perfect balance between performance, reach, and scalability for dense environments up to 500m.
Whether you're upgrading your AI fabric or future-proofing your data center core, this module is ready for tomorrow's bandwidth needs.