Hi Bryan,
User of Brocade switches here.
Any port can be configured in access or trunk mode. That means Ethernet/SFP/SFP+ ports are all the same when it comes to your question. You can make SFP ports as an access port. There are 2 ways to do it.
You can make the port an ACCESS PORTfor that VLAN by doing as such. ONLY that VLAN would be passed to that port:
conf t
vlan XXX
untagged e 1/x/x
exit
Another way would be to make it a TRUNK PORT with a native VLAN. Advantage would be that you can pass other VLANs as tagged traffic (to another device like switch or access point or something else):
conf t
vlan XXX
tag e 1/x/x
exit
int e 1/x/x
dual-mode XXX
exit
where XXX - is your VLAN
P.S. when done, run "write memory" to save your progress.
Cheers,
Alex