Which Optical Module Should You Choose: Single-Fiber or Dual-Fiber?

When designing or upgrading a fiber network, one key decision is whether to use dual-fiber or single-fiber (BiDi) optical modules. Both have their own characteristics and are suited to different scenarios. Here's a breakdown of the differences and important considerations.

🔍 Basic Differences

⚠️ Notes

Single-fiber BiDi modules must be used in matched pairs (e.g., one transmits at 1310nm and receives at 1490nm, and the other does the opposite).

Compatibility between different brands/models of BiDi modules may vary, so always verify interoperability before deployment.

BiDi modules are more sensitive to fiber connector cleanliness, requiring extra attention during maintenance.

Not all switches or networking devices support BiDi modules. Always confirm compatibility regarding supported wavelengths and module types.

📌 Summary

Dual-fiber modules are cost-effective and offer better compatibility when fiber resources are sufficient.

Single-fiber modules are ideal for saving fiber resources, especially in long-distance or fiber-limited environments.

If you need help deciding which module fits your project best, feel free to share the scenario—including transmission distance, switch models, or existing fiber infrastructure—and we'll help you make the right choice.