Cisco Compatible 100G QSFP28 to 25G SFP28 Adapter Converter Module.

Cisco QSFP-100G-SR4-S Compatible 100GBase-SR4 QSFP28 Transceiver (MMF, 850nm, 100m, MPO, DOM)

Cisco QSFP-100G-CWDM4-S Compatible 100GBase-CWDM4 QSFP28 Transceiver (SMF, 1270nm to 1330nm, 2km, LC, DOM)

Cisco QSFP-100G-SM-SR Compatible 100GBase-CWDM4 QSFP28 Transceiver (SMF, 1270nm to 1330nm, 2km, LC, DOM)

Cisco QSFP-100G-PSM4-S Compatible 100GBase-PSM4 QSFP28 Transceiver (SMF, 1310nm, 500m, MTP/MPO, DOM)

Cisco QSFP-100G-LR4-S Compatible 100GBase-LR4 QSFP28 Transceiver (SMF, 1295nm to 1309nm, 10km, LC, DOM)

Cisco QSFP-100G-ER4L-S Compatible 100GBase-ER4 QSFP28 Transceiver (SMF, 1295nm to 1309nm, 40km, LC, DOM)

Cisco QSFP-100G-ZR4-S Compatible 100GBase-ZR4 QSFP28 Optical Transceiver Module (SMF, 1310nm, 80km, LC, DOM).