The QSFP28 PSM4 is a Four-Channel, Pluggable, Parallel, Fiber-Optic QSFP28 Transceiver for 100G Ethernet  Applications. The QSFP28 full-duplex optical module offers 4 independent transmit and receive channels, each capable of 26Gbps operation for an aggregate data rate of 104Gbps 2km using single mode fiber. These modules are designed to operate over single mode fiber systems using  DFB laser array. An optical fiber ribbon cable with an MPO/MTPTM connector can be plugged into the QSFP28 module receptacle. QSFP28 PSM4 is one kind of parallel transceiver which provides increased port density and total system cost savings.

The OFQ212G10C-FP4 QSFP28 optical transceiver is intended for up to 10km reach service with four-lane 25.78125G data rate. It is based on 3.3V DC power supply and operates in the commercial temperature range. It is compliant with QSFP MSA 、SFF-8436 、SFF-8636 and PSM4 MSA. Digital diagnostic functions are available via  I2C interface，and the control functions can be  achieved by LVTTL interfaces on the host，mainly including Module Select(ModSelL)、Module Reset(ResetL)、 Low Power Mode(LPMode). The transceiver incorporates a four-laser array which is usually DFB 、four-PIN diode array 、a high performance CDR integrated four drivers and TIAs IC separately. The differential AC coupled Tx and Rx data interfaces are CML compatible.

The 100G FR1 SFP56-DD optical transceiver, 100G SFP56-DD FR1 is designed for using in 100-Gigabit Ethernet links up to 2km over Single-Mode Fiber (SMF). It is compliant with the SFP56-DD MSA,IEEE802.3CU,100G Lambda 100G FR1 and 100GAUI-2(no FEC)1. Digital diagnostics functions are available via the I2C interface, as specified by the SFP56-DD MSA. The module incorporates 1 channel optical signal, on 1311nm center wavelength, operating at 100Gbps data rate. This module can convert 2 channels of 53Gbps (PAM4) electrical input data to 1 channel of 106Gbps (PAM4) optical signal, and also can convert 1 channel of 106Gbps (PAM4) optical signal to 2 channels of 53Gbps (PAM) electrical output data. The optical interface uses a Duplex LC connector. The high performance cooled EML transmitter and high sensitivity PIN receiver provide superior performance for 100Gigabit Ethernet applications up to 2km links.