Introduction: 25G Optical Modules in 5G Networks
5G network architecture splits the traditional BBU into CU (Centralized Unit) and DU (Distributed Unit), creating a three-level transport structure: Fronthaul, Midhaul, and Backhaul. 25G optical modules play a critical role in midhaul and backhaul networks, offering the ideal balance of bandwidth, cost, and reach for 5G transport.
5G Transport Network Architecture
Fronthaul: AAU to DU, 25G/10G, carrying ~1.25Gbps eCPRI traffic per sector
Midhaul: DU to CU, 25G/50G, aggregating traffic from multiple AAUs
Backhaul: CU to 5G Core, 50G/100G for high-capacity core connectivity
25G in Midhaul Networks
Midhaul connects DU and CU, carrying aggregated traffic from multiple AAUs. 25G SFP28 optical modules are the mainstream choice for midhaul, with transmission distances typically ranging from 10-40km. 25G SFP28 LR/ER optical modules are recommended for most midhaul deployments.
25G in Backhaul Networks
In small cell and edge node backhaul scenarios, 25G modules provide sufficient bandwidth. Pair with fiber patch cables to establish point-to-point connections. For distances exceeding 40km, consider DWDM/CWDM optical modules for wavelength division multiplexing.
Module Selection Guide
1. DU-CU Midhaul (within 10km): 25G SFP28 LR, best cost efficiency
2. Backhaul (10-40km): 25G SFP28 ER/ER+Lite
3. Limited Fiber: 25G BiDi or CWDM solutions
4. Temperature Requirements: Outdoor deployments require industrial grade (-40 to +85°C)
Langzhi Technology offers a complete range of 25G optical modules for 5G transport
