Optical Datasheet: https://www.juniper.net/us/en/local/pdf/datasheets/1000329-en.pdf
| SPF : 1G | ( SKU: 740-013111 1000 Base-T RJ45 SFP Module) | ||
| SFP+ : 10G | |||
| SPF28: 25G ( 10G ) | While SFP28 is backward compatible with SFP+ and SFP, the reverse isn't true; an SFP+ port cannot use an SFP28 transceiver. | ||
| QSFP : 40G | ( or QSFP+ ??? ) | SPF28: 25G||
| QSPF28 : 100G | ||
| |||
| QSFP56-DD : 400G | MPO connector |
Optics / Transceiver compatibility
https://apps.juniper.net/hct/category/#catKey=100001&modelType=All&pf=QFX+Series
...