When the 10G network has gradually been unable to meet the needs of users, the 40G network system has entered people's attention. Since then, the 40G optical module has brought a qualitative leap in optical fiber transmission speed. What is a 40G optical module? What are the unique advantages? What are the common models? The answers to these questions are below, and Guangrun will take you to find the answers together.
1. What is a 40G optical module?
The 40G optical module is a product derived to meet the needs of higher-density high-speed pluggable solutions. It has 4 independent transmit and receive optical signal channels, which can be used for data centers, high-performance computing networks, and enterprise core layers. The distribution layer and telecom operators provide high-density and low-power 40G Ethernet connection transmission applications.
2. What are the classifications of 40G optical modules?
There are three types of 40G optical modules: CFP, QSFP and QSFP+ optical modules:
40G CFP optical module is specially designed for 40G Ethernet link on single-mode optical fiber, it complies with RoHS-6 standard, and provides digital diagnostic function through MDIO interface designated by CFIO MSA;
The 40G QSFP (Quad Small Form-factor Pluggable) optical module has four independent full-duplex transceiver channels and is a four-channel small pluggable optical module. The transmission rate of this four-channel interface can be as high as 40Gbps. The density of QSFP optical modules is 4 times that of XFP optical modules and 3 times that of SFP+ optical modules. As an optical fiber solution, it meets the needs of high-density and high-speed transmission;
40G QSFP+ optical module is a product developed on the basis of QSFP, which is dedicated to high-density applications. Compared with traditional SFP+ optical modules, the port density is higher and the overall system cost is lower. The 40G QSFP+ optical module complies with SCSI, 40G Ethernet, 20G/40G Infiniband and other standards. It has four data transmission channels, and the transmission rate of each channel is about 10Gbps. The simultaneous transmission of four channels can achieve a transmission rate of 40Gbps. This kind of optical module mainly has two kinds of interfaces: LC and MTP/MPO (as shown in the figure below), which are used in single-mode applications and multi-mode applications, respectively.
3. Application of 40G QSFP+ optical module
There are many types of 40G QSFP+ optical modules, including 40GBASE-SR4, 40GBASE-LR4, 40GBASE-ER4, etc. This section will introduce these three optical modules and their applications in detail.
40GBASE-SR4 optical module adopts MTP/MPO interface, working wavelength is 850nm, generally used in multi-mode applications. When it is used with OM3/OM4 multimode fiber, the transmission distance is 100m and 150m respectively, and it is mainly used to realize the connection between network devices in the data center. 40GBASE-SR4 optical module can not only use MTP/MPO fiber jumper to realize the connection between two 40G network equipment, but also can be used with MTP/MPO to LC fiber jumper to realize the connection between 40G network equipment and 10G network equipment.
40GBASE-SR4 optical module adopts MTP/MPO interface, working wavelength is 850nm, generally used in multi-mode applications. When it is used with OM3/OM4 multimode fiber, the transmission distance is 100m and 150m respectively, and it is mainly used to realize the connection between network devices in the data center. 40GBASE-SR4 optical module can not only use MTP/MPO fiber jumper to realize the connection between two 40G network equipment, but also can be used with MTP/MPO to LC fiber jumper to realize the connection between 40G network equipment and 10G network equipment.
4. What are the characteristics of 40G optical modules?
1. Use the transmission frequency band reasonably and effectively, and the spectrum efficiency is relatively high;
2. The cost is effectively reduced, and it is more economical than other metropolitan area network solutions;
3. Simplify the network structure and reduce the number of accessories. It is worth mentioning that in metro backbone network applications, its scheduling and integration are far superior to four 10G systems, which can save computer room area, reduce equipment stacking, and improve the bandwidth management and scheduling capabilities of single-node equipment ；
4. Usually a single wavelength can handle multiple data connections, the functions of the core network will be greatly enhanced, and services can be better expanded.