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Now 100G Ethernet technology is quite mature, and 100G networks of major enterprises, institutions or governments have been deployed. In the development of 100G Ethernet technology, 100G QSFP28 optical module is widely used in application scenarios, and the optical module marked as LR4 is the most common, so what is QSFP28 LR4? What is the difference between it and the CFP LR4/CFP2 LR4/CFP4 LR4 optical module? Next, Yi Tianguang Communication ETU-LINK will give you a detailed answer through this article.

What is the QSFP28 LR4 optical module?

Optical module is a kind of optical transceiver module which plays the role of photoelectric conversion, in which the transmitter converts the electrical signal into optical signal, which is transmitted through optical fiber, and the receiver converts the optical signal into electrical signal after receiving. The "G" of 100G refers to the unit of optical signal transmission rate. LR refers to the transmission distance, which generally represents the transmission of 10km. Therefore, the transmission rate of QSFP28 LR4 optical module is 100G and the transmission distance is 10km optical transceiver module.

What is the difference between QSFP28 LR4 single-mode optical module and other 100G optical modules

100g optical modules are available in a variety of packages, including CFP/CFP2/CFP4, CXP and QSFP28. The letter "C" in CFP/CFP 2/CFP 4 and CXP stands for "Q" in 100th Quad 28, which means that there are four transmission channels; SFP28 represents a 25G optical module, then the QSFP28 with four transmission channels is a 100G optical module, where "28" represents the maximum speed of each channel is 28Gbps.

As can be seen from the above table parameters, the 100G LR4 optical modules with four different packaging forms all have the same LC duplex interface and the transmission distance between the single mode fiber type and the 10km; but because of their different packaging forms, the QSFP28 LR4 optical module is about 30% smaller than the CFP4 optical module. Compared with CFP/CFP2/CFP4-LR4 optical module, QSFP28-LR4 optical module is not only smaller than CFP-LR4 optical module, but also does not need to install expensive transmission. At the same time, the port density of QSFP28-LR4 optical module is 45 times that of CFP2-LR4 optical module.

In the future, the area and power consumption of the data center can not be increased indefinitely, so users need optical modules with lower power consumption, smaller size and lower cost to meet the construction of 100G network. Therefore, the QSFP28-100G-LR4 optical module of Yi Tianguang communication can meet these needs of 100G network and become the most popular 100G LR4 optical module.

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