A Complete Guide to 100G QSFP28 Transceiver

Why Is 100G QSFP28 Popular?

In recent years, with the needs of users and the development of data centers, low-speed optical communication products can not meet the daily data transmission needs. data transmission of optical modules has been accelerated from 10G, 25G, and 40G to 100G, 200G, and even 400G. At present, there are various packaging forms of 100G optical modules of optical communication credit in the market. The first generation of 100G optical modules are CFP optical modules with very large volumes, followed by CFP2 and CFP4 optical modules. Among them, the CFP4 optical module is the latest generation of the 100G optical module, and its width is only 1 / 4 of that of the CFP optical module. The package size is consistent with that of the QSFP+ optical module. The packaging style of the QSFP28 optical module is smaller than the CFP4 optical module, which means that the QSFP28 optical module has a higher port density on the switch. Therefore, QSFP28 is the mainstream scheme of 100G optical modules and the focus of this paper.

Top 100G QSFP28 Transceiver Types

Top 1 – 100G QSFP28-SR4

100G QSFP28 SR4 optical module is a parallel 100G optical module. QSFP28 full-duplex optical module provides four independent transmission and reception channels. Each function can operate at 25Gbps at 100m of OM4 MMF. The overall data rate is 100Gbps. It is mainly used in data centers. When the 100GBASE-SR4 QSFP28 optical module transmits signals at the transmitting end, the electrical signals are converted into optical signals through the 4-array laser, and then transmitted in parallel on the banded multimode fiber. When reaching the receiving end, the 4-array photodiode converts the parallel optical signals into parallel electrical signals.

Top 2 – 100G QSFP28-LR4

optical module generally adopts LC single-mode optical fiber jumper for signal transmission, and the maximum transmission distance can reach 10km. The optical module converts four 25Gbps electrical signals into four LAN WDM optical signals and then multiplexes them into a single channel by MUX or WDM to realize 100G optical signal transmission. At the receiving end, the module uses demux to demultiplex 100G optical input into 4-channel LAN WDM optical signal, and then convert it into a 4-channel electrical signal and then output the channel.

Top 3 – 100G QSFP28-CWDM4

The transmission rate of the 100G QSFP28 CWDM4 optical module is 103.1Gbp. is mainly used in computing, high-frequency trading, and other fields. Its cost is significantly higher than that of the 100G QSFP28 PSM4 optical module. Through coarse wavelength division multiplexing (CWDM) technology, QSFP28 CWDM4 optical module multiplexes 1270nm, 1290nm, 1310nm, and 1330nm to a single-mode optical fiber for signal transmission.

Top 4 – 100G QSFP28-PSM4

100G QSFP28 PSM4 optical module is a high-speed and low-power product, which is specially used for optical interconnection in data communication applications. It complies with PSM4 MSA optical interface specification, has a hot-pluggable QSFP shape and built-in digital diagnosis function. It has four independent full-duplex channels, with a data rate of 25.78gbps and a wavelength of 1310nm for each channel. IT QSFP28 PSM4 optical module is mainly used in 40G and 100G Ethernet. The high bandwidth module supports 100Gbe through a single-mode fiber optical link.


The above four 100G QSFP28 optical modules have the characteristics of low power consumption, small volume and high speed. It is mainly used in 100G data center internal network, data center interconnection, metropolitan area network and other environments. QSFPTEK 100G QSFP28 optical module can be applied to Cisco, juniper, H3C, Arista, Juniper, Alcatel lucent, and other equipment. Welcome to contact QSFPTEK team via

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