100G is available in a variety of packages, including CFP/CFP2/CFP4, CXP and QSFP28. Among these different 100G packaging forms, QSFP28 optical module has become the main packaging method of 100G network because of its advantages of high port density, low power consumption and low cost. Let me show you more content.
1. 100GBASE-LR4 QSFP28 optical module
100GBASE-LR4 QSFP28 optical modules are generally used with LC single-mode fiber patch cords, and the maximum transmission distance can reach 10km. The 100GBASE-LR4 QSFP28 optical module converts 4 channels of 25Gbps electrical signals into 4 channels of LAN WDM optical signals, and then multiplexes them into a single channel to achieve 100G optical transmission. At the receiving end, the module demultiplexes the 100G optical input into 4 channels of LAN WDM optical signals, and then converts them into 4 channels of electrical signal output channels。
2. 100GBASE-SR4 QSFP28 optical module
100GBASE-SR4 QSFP28 optical module is a parallel 100G optical module. The QSFP28 full-duplex optical module provides 4 independent transmit and receive channels, each function can operate at 25Gbps at 100 meters of the OM4 MMF, and the overall data rate is 100Gbps.
When the 100GBASE-SR4 QSFP28 optical module transmits signals at the transmitting end, the electrical signals are converted into optical signals by the laser array, and then transmitted in parallel on the ribbon multi-mode fiber. When reaching the receiving end, the photodetector array converts the parallel optical signals. into parallel electrical signals
3. 100GBASE-PSM4 QSFP28 optical module
The QSFP28 PSM4 optical module is a high-speed and low-power product designed for optical interconnects in data communication applications. It complies with the PSM4 MSA optical interface specification, has a hot-swappable QSFP form factor, has built-in digital diagnostics, and has 4 independent full-duplex channels, each capable of a data rate of 25.78Gbps.
QSFP28 PSM4 optical modules are mainly used in 40G and 100G Ethernet, high-bandwidth modules support 100GbE optical links through single-mode fiber
The following figure is the working principle of PSM4 QSFP28 optical module in 100G Ethernet:
4. 100GBASE-CWDM4 QSFP28 optical module
The transmission rate of QSFP28CWDM4 optical module is 103.1Gbps, which is mainly used in computing, high-frequency trading and other fields. Its cost is significantly higher than that of QSFP28 PSM4 optical module.
Through Coarse Wavelength Division Multiplexing (CWDM) technology, the QSFP28CWDM4 optical module multiplexes four wavelengths of 1270nm, 1290nm, 1310nm and 1330nm onto a single-mode fiber for transmission. The following figure is the working principle of PSM4 QSFP28 optical module in 100G Ethernet:
This article introduces the basic information of four 100G QSFP28 optical modules. In addition to the general products mentioned in this article, we have other products that are compatible with major brands such as Cisco and Huawei. For more information, please visit the official website
