How Do BiDi Transceivers Help to Build an Efficiency 5G Fronthaul Network?

Posted on Jan 2, 2024 by

With the advent of 5G network, the development of communication technology has reached a crucial milestone. 5G creates huge demands for optical modules, especially modules with higher rates, longer transmission distances, wider temperature ranges, and lower costs. As the world increasingly relies on high-speed and reliable connectivity, and 5G fronthaul fiber resources are limited, there is an urgent need for single-fiber bidirectional (BiDi) optical modules.

10G BiDi Transceivers

Challenges in 5G Network Transmission

5G will bring a revolutionary service experience and new business models. However, it also imposes many new requirements on transport networks. The key features of 5G networks are large bandwidth, low latency, and high connection density. Existing transport technical specifications, network architectures, and functions cannot meet the requirements of emerging 5G services and applications, which introduce several challenges in data transmission. These challenges include:

  • High Data Rates: 5G networks demand higher data rates to support applications such as augmented reality, virtual reality, and the Internet of Things (IoT).

  • Limited Fiber Resources: Fronthaul networks face constraints in fiber availability, necessitating innovative solutions for efficient utilization.

  • Bidirectional Communication: Traditional communication modules may struggle to efficiently handle bidirectional communication on a single fiber.

What Is BiDi Transceiver?

BiDi transceivers, short for Bidirectional Small Form-Factor Pluggable transceivers, are optical communication modules designed for bidirectional data transmission over a single optical fiber. Unlike traditional transceivers that use separate fibers for upstream and downstream communication, BiDi transceivers leverage wavelength division multiplexing (WDM) technology to enable bidirectional communication on a single fiber, optimizing space utilization and paving the way for enhanced network efficiency. As shown below, there is only a single-fiber path available in which the A-to-Z transmission and Z-to-A transmission travel bi-directionally along the same fiber route over different wavelengths, which optimizes space utilization and paves the way for enhanced network efficiency.

10G BiDi Transceivers

How BiDi Transceivers Address 5G Network Challenges?

Reduced Fiber Requirements

Utilizing a single optical fiber to perform tasks that originally required two helps decrease the cost and complexity of cable installation.

Enhanced Speed and Efficiency

BiDi transceivers optimize data transmission by supporting bidirectional communication over a single optical fiber. This innovation significantly enhances the speed and efficiency of data transfer in 5G networks.

Lower Energy Consumption and Space Occupancy

With a reduced number of fibers, there's a corresponding decrease in optical equipment, including components on both the receiving and transmitting ends. This translates to overall energy savings and frees up data center space.

Simplified Network Management

Simplified network architecture makes network management and maintenance easier by reducing the number of devices that need monitoring and upkeep.

Enhanced System Flexibility

BiDi modules provide flexibility in adjusting network capacity and hierarchy without increasing the number of optical fibers, making it easier to modify data throughput.

Support for Existing Infrastructure Upgrades

For existing optical fiber network infrastructures, upgrading to higher-speed communication standards like 5G can be achieved without the need for reinstallation by leveraging BiDi modules.

Applications of BiDi Transceivers in 5G Fronthaul Network

BiDi (Bidirectional) modules in 5G fronthaul applications primarily focus on efficiently connecting Remote Radio Units (RRUs) in remote wireless devices to the Baseband Units (BBUs) at the core of base stations.

Application Scenarios

Urban Area Coverage

In urban environments, BiDi modules can be used to connect dispersed small RRUs with centralized BBUs. This is effective in city settings where fiber networks are often already in place underground, allowing BiDi modules to make optimal use of this infrastructure.

Indoor Coverage

Within large buildings or commercial spaces, BiDi modules can connect multiple indoor-distributed small RRUs and BBUs using existing single fibers. This reduces the complexity and cost of wiring.

Suburban or Rural Coverage

In areas where existing fiber resources may be limited, BiDi modules maximize the efficiency of available fibers, achieving broader coverage.

Highway Coverage

Along highways, RRUs can be deployed using a single fiber and BiDi modules, connecting back to distant BBUs. This approach optimizes the deployment for coverage along the highway.

Temporary Deployment or Disaster Recovery

In situations requiring temporary or rapid restoration of 5G networks, such as concerts, sports events, or post-disaster scenarios, BiDi modules simplify the deployment of network equipment.

Connectivity Solutions

Point-to-Point Single Fiber Bidirectional Transmission

In this scheme, a 25Gbps BIDI single-fiber bidirectional optical module is used for direct connection, enabling bidirectional signals with different wavelengths between AAU and DU to be transmitted over a single optical fiber, thus saving half of the fiber resources. This approach is highly practical for shorter and direct fronthaul links.

10G BiDi Transceivers


In conclusion, BiDi transceivers play a pivotal role in overcoming the challenges posed by 5G network transmission. Their ability to enhance speed, maximize fiber resources, and efficiently handle bidirectional communication positions them as a crucial component in building an efficient 5G fronthaul network. As we navigate the complexities of 5G connectivity, BiDi transceivers emerge as a reliable and innovative solution to ensure the seamless transmission of data in the era of ultra-fast and interconnected networks.

You might be interested in

See profile for Sheldon.
Decoding OLT, ONU, ONT, and ODN in PON Network
Mar 14, 2023
See profile for Irving.
What's the Difference? Hub vs Switch vs Router
Dec 17, 2021
See profile for Sheldon.
What Is SFP Port of Gigabit Switch?
Jan 6, 2023
See profile for Migelle.
PoE vs PoE+ vs PoE++ Switch: How to Choose?
Mar 16, 2023
See profile for Moris.
How Much Do You Know About Power Cord Types?
Sep 29, 2021