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5G5G is coming, and 5G optical network has tens of millions of demands for optical devices. The wireless base station is usually installed in the communication tower or the roof of the building. So the optical devices used in the fronthaul and middlehaul need to meet the use of outdoor scenes. The most important thing is that the operating temperature range of the devices needs to meet the requirements of the industrial grade, -40℃ to 85℃. Another indoor scene, by the way, is generally a commercial grade temperature requirement, 0℃ to 70℃. In the fronthaul scenario, most of the transmission distance is below 10km. Of course, there will be a gap between the theoretical value and the actual application of the current network. And, there will be a problem that the attenuation of the link will increase as fiber aging and the distance of the coverage area might be at the critical value, so the transmission distance above 10km, such as 20km, will still be needed. In the middlehaul scenario, the transmission distance is between 10 and 40km, and there are two operating temperature requirements for industrial and commercial grades. For 5G fronthaul and middlehaul applications, HMM Data has launched a series of industrial-grade optical transceivers, including 25G SR/LR/BiDi/CWDM/DWDM SFP28 modules for 10km/20km applications in the 5G fronthaul network, and 100GBASE-LR4/ QSFP28 modules used for 10km/40km applications in 5G middlehaul (and backhaul) network.
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