After talking with my Brocade vendor, "there are no such thing as 16 GB FC AOC cable". Is have been a misunderstanding between Brocade FiberChannel and Brocade ethernet
I mean, the communication in Brocade FC is always done with the chain Transceiver FC<->Fiber cable<->Transceiver FC at 8, 16 Gbps or whatever.
In the other hand, the communication in Brocade ethernet can be done via with the chain Transceiver Ethernet<->Fiber cable<->Transceiver ethernet or alternatively with a single DAC/AOC cable whare each tail of the cable has to be compatible with the final device.
@Zac67 thanks for your answer. I will accept mine because it's a bit more accurrate.