With the rise of cloud computing, big data, mobile Internet and smart cities, Internet data traffic is exploding, and operators need to upgrade existing data centers to cloud data centers to provide more flexible business and application support. . Current data centers are primarily based on 10G Ethernet architectures, and in order to handle the ever-increasing data load, these data centers must scale by increasing the bandwidth capabilities in parallel with existing infrastructure. Interestingly, compared with the well-known upgrade route of 10Gbit/s→40Gbit/s→100Gbit/s, operators are now more inclined to choose the evolution path of 10Gbit/s→25Gbit/s→100Gbit/s. Why can 25G replace 40G as a 10G baton? Looking back at the development of the Ethernet standard, the 40G and 100G standards have long been "beads in the front" and have been launched around 2010. The 25G standard has only matured in recent years. In 2014, the IEEE (Institute of Electrical and Electronics Engineers) established the IEEE802.3by working group. In July 2016, the IEEE officially announced its 100Gbit/s (4-channel 25Gbit/s) Ethernet technology defined by IEEE802.3bj. Up to 100m multimode fiber 25Gbit/s Ethernet transmission specification, and also introduced the specification of single mode fiber 25Gbit/s Ethernet. From the fact that the IEEE has introduced the 25G standard after 40G and 100G, we can also infer that 25GbE technology must have a unique "charm". Figure 1: The evolution of the Ethernet standard In fact, as long as the 25G and 40G standards are simply compared, we can also conclude that the 25G evolution path is better than the 40G upgrade route. On the one hand, although it is possible to achieve 40G by aggregating four 10GbE physical channels, or to aggregate 10 10GbE channels to run 100G speeds, these solutions are more expensive and consume more power than 25G. On the other hand, compared to 10G, the 25G solution has the advantage of enhanced computing and storage efficiency, can provide higher bandwidth, faster connection, and can run 50G for two 25G channels, or 100G for four channels. When transitioning to the next generation network, its capital and operating expenses are relatively balanced. More importantly, 25GbE is backward compatible and can communicate with 10G, so adding a new server can still work with existing network devices, helping network operators to more easily expand their data centers. Due to the above-mentioned significant advantages, the trend of the 25G solution becoming a 10G baton has a very large rationality. At present, optical modules suitable for 25G Ethernet in the industry mainly have two package styles, namely SFP28 (1x25Gbps) and QSFP28 (4x25Gbps). Among them, SFP28 optical module is based on SFP+ package, can provide 25Gb / s error-free transmission, transmission distance can reach 100 meters in super four types of multimode fiber, and can be applied to high-density 25G Ethernet switches and networks. In the road interface, it provides a cost-effective solution for operators to upgrade 10G Ethernet. The QSFP28 optical module can provide four 25Gbps high-speed signal channels and is used in high-density 25G Ethernet switches and network interfaces, providing a smooth upgrade for data center to further evolve to 100Gbps Ethernet (4x25Gbps). . Figure 2: Core Communications SFP28 25G SR Optical Module Figure 3: Core Communications SFP28 25G LR Optical Module The SFP28 25G SR and SFP28 25G LR series optical modules are the mature 25G optical modules of the industry, which can meet the various needs of operators' upgraded data centers.
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