Purchase optical modules separately

Optical modules, such as Huawei's StarryLink series, can be purchased separately to allow flexible deployment and compatibility with various network devices.What Are Optical Modules?

An optical module is a hot-pluggable transceiver that operates at the physical layer of the OSI model, converting electrical signals into optical signals and vice versa during fiber-optic communication . It typically consists of:

• Transmitter Optical Sub-Assembly (TOSA): Converts electrical signals into optical signals using a laser diode (LD) or LED .
• Receiver Optical Sub-Assembly (ROSA): Converts incoming optical signals back into electrical signals using photodetectors like PIN or avalanche photodiodes (APD), .
• Functional circuits and housing: Include driver chips, preamplifiers, and protective shells . Optical modules are essential for high-bandwidth data communications, connecting servers, switches, and other network devices via fiber-optic cables .

Why Optical Modules Are Sold Separately

Optical modules are often purchased separately from network devices for several reasons:

1. Flexibility in Deployment: Data centers and AI clusters may require different types of optical modules depending on distance, bandwidth, and device compatibility. For example, a large AI training cluster may need thousands of 200G or 400G optical modules .
2. Compatibility Across Devices: Separately sold modules allow users to select modules compatible with existing NICs, switches, and multi-vendor environments .
3. Inventory and Maintenance Efficiency: Purchasing modules separately enables easier replacement, upgrades, and inventory management without replacing entire devices .
4. Support for Various Standards: Modules adhere to industry standards and support mainstream interfaces and protocols, ensuring interoperability .

Types and Selection

Optical modules vary by transmission distance, fiber type, and application scenario, including VR, SR, DR, and FR modules . Selection depends on:

• Server NIC interface bandwidth for server-to-switch connections.
• Switch bandwidth and traffic model for inter-switch connections.

Conclusion

Purchasing optical modules separately provides flexibility, scalability, and cost efficiency in network deployment. It allows organizations to tailor their optical interconnections to specific performance requirements, maintain compatibility with existing infrastructure, and simplify upgrades and maintenance .