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Rru optical module type

Fiber and communications infrastructure knowledge brief Published 30 Jun 2021

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

RRUs use optical modules to connect to BBUs, with types including single-mode (SM), multimode (MM), and CWDM modules supporting data rates from 1. 25G to 10G. Overview of Optical Modules in RRUsOptical modules in RRUs serve as the transmission interface between the Baseband Unit (BBU) and the Remote Radio Unit (RRU), converting electrical signals to optical signals for high-speed fiber communication.

They are essential in distributed base station architectures, especially for 4G and 5G networks. Common TypesSingle-Mode (SM) Optical ModulesDesigned for long-distance transmission over single-mode fiber. Typically labeled as "SM" on the module.

Used in scenarios where the BBU and RRU are far apart, often combined with CWDM (Coarse Wavelength Division Multiplexing) to optimize fiber usage. Multimode (MM) Optical ModulesDesigned for shorter distances using multimode fiber. Labeled as "MM" and often have black or gray pullers.

Suitable for compact sites or indoor deployments where fiber length is limited.

CWDM Optical Modules

Used in serial networking of multiple RRUs to reduce fiber usage. Allow multiple wavelengths to share a single fiber, solving long-distance transmission and fiber scarcity issues. Data RatesRRU optical modules support various transmission speeds depending on network requirements: 1.

25G and 2. 5G for standard 4G connections. 6G and 10G for high-capacity 4G or 5G deployments.

Physical IdentificationColor-coded pullers: Blue for single-mode, black/gray for multimode. Labels: Indicate rate, wavelength, and transmission mode, helping engineers select the correct module for the site.

Practical Considerations

The number of optical fibers per RRU typically ranges from 2 to 6 cores, depending on the configuration and data throughput.

CWD

M modules are often paired with OS2 single-mode fiber patch cords to connect multiple RRUs efficiently. Selection depends on distance, network capacity, and whether the deployment is indoor or outdoor. In summary, RRU optical modules are categorized by fiber type (SM/MM), data rate (1.

25G–10G), and wavelength multiplexing (CWDM), ensuring flexible, high-speed connectivity between BBUs and RRUs in modern cellular networks.

Rru optical module type - CJC FIBRE CONSULTANTS [PDF]

Rru optical module type

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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