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...

AOC is composed of integrated optoelectronic devices for high-speed, high-reliability interconnected transmission device between data centers, high-performance computers, and large-capacity memory devices. It usually meets the industry standard electrical interface and transmits data by the superiority of fiber optic cable and electrical-to-optical conversion. While AOC reaches can extend to the limits of the optical technology used (100-200m), installing a long 100m cable, complete with an expensive transceiver end, is difficult in crowded data center racks so the average reach typically used is between 3-30m. Only one “oops” per cable allowed. Damaging the cable means replacing it as it cannot be repaired in the field. AOCs are typically deployed in open access areas such as within racks or in open cable trays for this reason. Gigalight 25G SFP28 Active Optical Cables (AOCs) are direct-attach fiber assemblies with SFP28 connectors, compliant with 25G Ethernet IEEE 802.3by 25GBA...

25G Ethernet, or 25Gigabit Ethernet (25GbE), is developed by IEEE 802.3 Task Force P802.3by. The IEEE 802.3by standard uses technology defined for 100Gigabit Ethernet implemented as four 25Gbps lanes (IEEE 802.3bj). Actually, 40G and 100G have already existed before the emergence of 25G. However, 25G Ethernet can provide a more convenient path to Ethernet speeds of 50G, 100G and beyond. With 25G, network operators are no longer to use 40G Ethernet (using four lanes of 10G) to migrate to 100G but using 4 lanes of 25G. The article introduces low-cost 25G AOC. What Is A 25G AOC? 25G AOC can be overcome the bandwidth limitation of traditional high-speed cable, and the 25G AOC can provide an ideal alternative solution for high-speed cable and short-distance SFP28 optical transceiver, and the signal is more complete and higher performance. It is widely used in high-speed, high-density, and low-power data center networks. The 25G AOC consists of optical transceiver devices at both ends a...

With the increasing demand for high bandwidth from private cloud, public cloud data center and service providers, 25G and 100G are widely used. 200G and 400G optical devices will be successively produced and shipped from 2019. So far, most server vendors have started offering servers 25G of fiber-optic network CARDS as an I/O(input/output) option, and Ethernet's signal transmission rate has increased from the earlier 10G to 25G, 100G or higher. While 1G, 10G and 40G currently dominate the Ethernet port market, the future demand for 25G and 100G is stronger than ever as high bandwidth is undeniably driving data centers toward greater scalability and flexibility. Why Is 25G Coming to Data Centers? Data centers are expanding at an unprecedented rate, driving the need for higher bandwidth connections between servers and switches. To accommodate this trend, the access network has been upgraded from 10G to 25G, providing high-density, low-cost, and low-power solutions for the conne...

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...

Since 2010, the global demand for optical devices has been increasing year by year. In 2014, the demand for optical devices reached a peak. Although the demand for optical transceivers declined after that, in 2019, with the arrival of the 5G era, the global demand for optical transceivers re-entered the rapidly growing channel. Especially in the Chinese market, the demand for wireless optical devices is very large. The application of 25G optical transceiver in 5G fronthaul is a basic consensus. Both operators and equipment manufacturers will consider 25G optical transceiver as a mainstream transceiver in the early stage of 5G construction. Meanwhile, for 100G optical transceivers, the equipment manufacturer has an optimistic expectation for the growth rate of 5G optical transceivers. With the gradual arrival of the global 5G era, this revolution has also brought about an explosion of the market demand for 5G optical transceivers and optical devices. What changes will the...

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...

South Korea has been seeking to become the world’s first country to provide commercial service for the 5G network. There are three companies that agreed to bring 5G to South Korea: SK Telecom (SKT), KT, and LG Uplus. Three Companies Offer 5G in South Korea SKT(SK Telecom) SKT 5G access is available for a manufacturing business in Ansan called Myunghwa Industry. The company also schedules to provide 5G to enterprise customers in Daejeon, Incheon, Daegu, Ulsan, Busan, and Gwangju. In 2017, with an outdoor 5G trial in Seoul, and shortly after built out 5G technology in their autonomous driving city called K-City. In 2018, their 5G test network enabled two cars to communicate with each other. And in early 2019, they made their first live 5G TV broadcast. This 5G rollout will mark the end of their 2G services. SKT is also part of a 5G smart factory alliance with over a dozen other companies. Announced in late 2018, the alliance was formed for two reasons: to investigate...

With the development of the optical communication industry and the improvement of the technology, the demand for bandwidth is increasing, the communication equipment manufacturers and operators will increase their investment in the optical communication network and equipment, thus driving the development of the optical module industry. The global optical module market keeps steady growth. According to Ovum's market share report, the communications market share is expected to grow in 2021. The global market for optical communications reached the US $10.1 billion in 2017 and has been growing rapidly. The market is expected to reach the US $16.6 billion by 2020, with a projected compound growth rate of 18 percent over the next three years. The development of optical communication technology cannot be separated from the milestone breakthrough of optoelectronic device technology. In the 1970s, the emergence of the semiconductor laser and low loss optical fiber unlock the doors of...