Difference between single-fiber module and dual-fiber module.ONU Modem Manufacturing

When we select optical modules, we often encounter two types: single fiber and double fiber. How should we choose, and what are their differences and advantages? Let's read the following happily! Children who are interested in this knowledge, let's play together!

Single-fiber optical module is also called WDM optical module. It uses WDM technology to realize bidirectional transmission of optical signals on a single fiber. The BIDI optical module has only one port, which is filtered by the filter in the optical module, and completes the transmission of 1310nm optical signal and the reception of 1550nm optical signal at the same time, or vice versa. Therefore, the module must be used in pairs.

Wavelength commonly used in BIDI optical module

Low speed: TX1310/RX1550nm; TX1550/RX1310nm; TX1490/RX1550nm; TX1550/RX1490nm; TX1310nm/Rx1490nm; TX1490nm/Rx1310nm

Common wavelengths of dual-fiber optical modules

Low speed: 850 nm; 1310nm; 1550nm

10G optical module: 850 nm; 1310nm; 1550nm

Advantages of single-fiber BIDI optical module: single-fiber bidirectional optical module is more expensive, but it saves fiber resources, only requires 1 fiber. It is a better choice for users with insufficient fiber resources.

Advantages of dual-fiber optical modules: 2-end modules do not need to be paired, and any two can be connected. The price is cheaper than single-fiber BIDI optical module. However, you need to use more than one fiber. If the fiber resources are sufficient, you can choose a dual-fiber optical module.