Introduction: 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:
- Form Factor: OSFP
- Line Rate: 2 × 800G (DR4)
- Connector: 2 × MPO-12
- Modulation: PAM4
- 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:
- Total reach per 800G DR4 link: Up to 500m
- 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.
About Optech
Optech Technology Co. Ltd was founded in 2001 in Taipei, Taiwan. The company was created with a sole purpose, to provide a wide and high quality portfolio of optical products to a very demanding and fast evolving market.
To respond to the permanent increase of IP traffic, Optech portfolio is constantly growing. Since the beginning, the company has always been up to date with the latest innovations on the market. Today, we are proud to deliver a large selection of 25G SFP28, 40G QSFP+, 100G QSFP28, 200G QSFP56, 400G QSFP-DD, 800G QSFP-DD/ OSFP and 1.6T OSFP optical transceivers and cables.
Optech has a large portfolio of products which include optical transceivers, direct attach cables, active optical cables, loopback transceivers, media converters and fiber patch cords.
Through its large selection of optical products, that have a range of data speed from 155 Mbps to 800 Gbps and reach distances up to 120km, Optech products are suitable for various industries such as telecom, data centers as well as public and private networks.
Ordering Information
| Part Number | Optech Part Number | Features | Note |
| OSFP-1.6T-2xDR4 | OPOR-SX5-13-CBO | 1.6T OSFP 2xDR4 single mode mode, 2XMTP/MPO-12 APC, 1310nm, 500M | Compatible with Nvidia MMS4A00 |
For additional information about Optech OSFP-1.6T-2xDR4 Transceiver, or price inquiry, please contact us at sales@optech.com.tw
