Lafite's Blog

In general, there are three ways of 25G access of server, namely DAC (Direct Attach Cable), optical transceiver and AOC(Active Optical Cable). DAC can reach no more than 5m, so it is difficult to meet the requirements of cross-rack wiring distance. The optical transceiver can reach up to 100m or more using multi-mode fiber, but the cost is high. AOC is an Active Optical Cable. AOC can reach up to 30m at a reasonable cost. Therefore, AOC cable is a good choice for cross-rack server access, which is more suitable for China's current data center rack power and network architecture. Here’s some information about the 25G AOC that you may be wondering about. 25G AOC provides a cost-effective solution for those same data center applications that require longer distance interconnect using active optical Ethernet technology. There are some advantages to 25G AOC . The Advantages of 25G AOC 25G is the next trend from 10G to reduce the cost per Gbit/sec 25G provides 2.5 times the b...

5G is expected to be implemented in the following years. To have this 5G network realized, optical communication will be the cornerstone technology independent of various fronthaul options. The demand for high-rate optical transceivers will significantly increase because higher base-station density is required for the 5G network. Although it is still not clearly determined which fronthaul architecture will be used in the 5G network, it is apparent that the network would employ both grey and color optics for 25Gbps based on 5G bandwidth requirement. Grey and Color Optics The light in WDM systems is carried over different wavelengths compliant with specific standards. To distinguish wavelengths in different systems, the wavelengths in WDM systems are called colored light whereas the wavelengths in common optical systems are called grey light. Grey light is within a certain wavelength range and does not have a standard wavelength, for example, the light at client-s...

We are now starting to see commercial 5G networks going live. Previous generations were focused on consumer and personal communications but now 5G will serve consumers, enterprises and take the internet of things to the next level, where superior connectivity is a prerequisite. Initially, 5G will be a capacity enhancer in metropolitan areas and enhanced mobile broadband and fixed wireless access will be ways for operators to address explosive traffic growth. According to LightCounting, 5G will drive significant growth in the global market for optical transceivers since 2019, especially in China. At the same time, the demand for low-speed optical devices below 10G will gradually decrease and increase in the demand for transceivers of 25G, 50G, and 100G. The change of optical transceiver demand is driven by 5G revolution. RAN architecture of the 5G system will realize the separation of CU and DU, which determines that 5G wireless network will include fronthaul, midhaul and ba...

Here’s a frequently asked question to address questions that have arisen from the significant uptick in the use of 25G transceivers, which is driven by high bandwidth demands in the enterprise, data center and service provider applications. 1. Why is the use of 25G increasing? Many network operators have chosen 25G instead of multiple 10G’s because 25G provides 2.5x bandwidth of the 10G in the same familiar SFP form factor at approximately the same power. This has enabled network equipment manufacturers to provide higher bandwidth connectivity. Rack-mountable switches and routers populated with 12 ports, 24 ports, and 48 ports on a single 1 RU faceplate are common for SFP. 2. What is the cost per bit of 25G? 25G provides 2.5x the bandwidth of 10G at a slight increase in cost. The result is nearly a 50% reduction in the cost per bit. 3. Is 25G standardized? The  IEEE (Institute of Electrical and Electronic Engineers)  has standardized 25G. See IEEE802.3b...