QSFP28 (Quad Small Form-Factor Pluggable SFP28). It integrates 4 channel lanes 25~28G transmit and receiver signals together to support 100G bandwidth. As the increasing demand of higher and faster speed, 100G transceiver modules is a good choice for Internet Service Providers, Mobile Operators and Data Centers. Compact and hot pluggable, compliant with QSFP28 MSA. Digital diagnostics Monitor are available via the I2C interface to read transceiver real-time operating parameters.

Do you know how many types of 100G modules?

QSFP28-SR4: for short transmission distance on Multimode fiber, nominal wavelength is 850nm, link length up to 70 meters on OM3 fiber or 100 meters of OM4 fiber via a MTP/MPO-12 connector. Compliant with IEEE 802.3bm 100GBASE-SR4 and CAUI-4 standard.

QSFP28-eSR4: similar as SR4, just transmission distance a little longer, up to 300meter.

QSFP28-LR4:  this transceiver converts 4 input channels of 25Gb/s electrical data to 4 channels of LAN WDM optical signals and then multiplexes them into a single channel for 100Gb/s optical transmission. On the contrary, the module de-multiplexes a 100Gb/s optical input into 4 channels of LAN WDM optical signals and then converts them to 4 output channels of electrical data on the receiver side. Support transmission distance up to 10km on single mode fiber with duplex LC connector. It is compliant with IEEE 802.3ba 100GBASE-LR4 and OTN OTU4.

QSFP28-CWDM4: link length up to 2km on single mode fiber with duplex LC connector. This module converts 4 input channels of 25 Gb/s electrical data to 4 channels of CWDM optical signals and then multiplexes them into a single fiber, using a nominal wavelength of 1310 nm, for 100 Gb/s optical transmission. Reversely on the receiver side, the 100 Gb/s optical input is de-multiplexed into 4 channels of CWDM optical signals and then converted to 4 output channels of electrical data.

QSFP28 ER4: adopt 4x25G LAN WDM technology (LWDM4), used for 100GBASE-ER4 Ethernet and OTN OTU4 links reach up to 30km without FEC or 40km with FEC over SMF. Forward Error Correction (FEC) is required in the host equipment in order to ensure reliable system operation at the specified distance. Without FEC transmission distance to 30km, and optical power budget is about 16dBm. With FEC up to 40km, power budget about 20dBm.