The 5G fronthaul transmission passive WDM system launched by Guangzhou Sintai Communication Co., Ltd. is mainly used to solve the problem of lack of optical cable resources in the optical fiber remote transmission between DU-AAU in C-RAN architecture. 

By deploying passive DWDM on DU and AAU sides, and replacing the original white optical module on wireless equipment with a matching color optical modules, it can provide different wavelength service optical signals and passive WDM on both sides. 

The service optical signals of different wavelengths are multiplexed on one core optical fiber for two-way transmission, instead of optical cable laying, providing a low-cost and high-performance optical fiber expansion solution for operators.

5G Fronthaul Passive WDM Sytem Feature

Support CPRI 1~10 and eCPRI (10G/25G), compatible with STM-1/4/16/64, GE/10GE/25GE, and other multi-service unified bearings, transparent transmission, and maximize the value of frontal transmission network.

Without changing the network structure, the physical channel of pure transparent transmission is extended without delay and jitter.

Modular configuration, 1:6/12/18 optional, can achieve multi-directional multi-level convergence, and large-scale optical fiber saving.

It can provide a variety of color optical modules, support CWDM 18 waves, MWDM 12 waves, meet the requirements of various line power budgets.

Pure passive working environment, fewer fault points, plug and play, no configuration, simple maintenance.

The passive wavelength division multiplexer is compact and light and supports rack type, wall hanging, holding a pole, and other installation methods.

5G Fronthaul Passive WDM Sytem Specification

Item of Passive Mux-Demux CWDM MWDM

Channel Number 6 12 18 6 12

Central wavelength (nm) 1271~1371 1271~1491,

1271~1371

&1471~1571 1271~1611 1267.5~1314.5 1267.5~1374.5

Maximum channel insertion loss ≤1.5 ≤2.0 ≤2.2 ≤1.5 ≤2.0

Center wavelength deviation (nm) ±1.5 ±1.0

1dB channel bandwidth (nm) ≥13 ≥5

The flatness of passband (dB) ≤0.5

Isolation of adjacent channels (dB) ≥30

Isolation of non-adjacent channels (dB) ≥40

Wavelength thermal stability (nm) ≤0.005

Insertion loss thermal stability (dB) ≤0.007

Polarization-dependent loss (dB) ≤0.15

Return loss (dB) ≥40

Protection switching time <50ms

Working temperature (°C) -40 ~ +70

Storage temperature (°C) -40 ~ +85

For more information about wavelength division multiplexing system, please feel free to contact us!