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BBU and RRU Single-Core Optical Modules

Fiber and communications infrastructure knowledge brief Published 22 Mar 2026

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Single-core optical modules connect the BBU and RRU, enabling high-speed, long-distance data transmission in distributed base station architectures.

Overview of BBU and RRU

In a distributed base station, the BBU (Baseband Unit) handles baseband signal processing, main control, clock synchronization, and transmission management, typically located indoors in a climate-controlled environment.

The RR

U (Remote Radio Unit) is mounted on the tower near antennas and manages RF signal transmission and reception, including amplification and filtering.

The RR

U connects to the BBU via optical fiber, forming the fronthaul link essential for high-speed communication.

Role of Single-

Core Optical ModulesSingle-core optical modules are used to transmit data between the BBU and RRU over a single optical fiber, supporting various data rates such as 1. 25G, 2. 5G, 6G, and 10G depending on network requirements.

These modules are critical in CPRI (Common Public Radio Interface) applications, converting electrical baseband signals into optical signals for long-distance transmission. They are particularly useful in scenarios where fiber resources are limited, and serial networking or CWDM (Coarse Wavelength Division Multiplexing) can multiplex multiple signals over a single fiber.

Environmental and Technical Considerations

Temperature Tolerance: BBU modules operate indoors under controlled temperatures, while RRU modules must withstand extreme outdoor conditions, from -40℃ to over 85℃, due to exposure to sunlight and environmental fluctuations. Reliability: RRUs are designed for passive heat dissipation without fans, so optical modules must maintain performance under high thermal stress. Fiber Requirements: Single-core modules often use OS2 single-mode fiber, and CWDM solutions allow multiple RRUs to share a single fiber, optimizing fiber usage and reducing deployment costs.

Data Integrity: Optical modules ensure minimal signal attenuation and high fidelity over distances, which is crucial for maintaining low-latency and high-throughput fronthaul connections.

Deployment Benefits

Using single-core optical modules between BBU and RRU allows operators to: Reduce the number of fibers required for multiple RRUs. Simplify network expansion and upgrades. Maintain high-speed, low-latency connections essential for 4G LTE and 5G networks.

Ensure robust operation in harsh outdoor environments without additional cooling systems. In summary, single-core optical modules are a key enabler for distributed base station architectures, providing reliable, high-speed optical links between indoor BBUs and outdoor RRUs while supporting industrial-grade environmental conditions and efficient fiber utilization.

BBU and RRU Single-Core Optical Modules - METRA FIBER MARKET [PDF]

BBU and RRU Single-Core Optical Modules

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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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