fiber optics and Ethernet cable are two different network medias actually these medias are not involved with openstack because they are OSI L2 interfaces if your operating system (Linux) has detected the fiber optic media, and your nodes are connected to each other there would be no problem for openstack which works in OSI L3 - L7 stacks,

with this change you have improved your BW from 1G to 10G which is a great improvement in speed of data transfer between nodes.