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
QSFP : 40G ( or QSFP+ ??? )
QSPF28 : 100G
QSFP56 : 400G
Optics / Transceiver compatibility
https://apps.juniper.net/hct/category/#catKey=100001&modelType=All&pf=QFX+Series
SRX1500, 10km: SRX-SFP-10GE-SR https://apps.juniper.net/hct/product/#prd=SRX1500