10G BID XFP transceivers are designed for bi-directional 10G serial optical data communications by using 1330(1270nm) transmitter and 1270(1330) nm receiver.
10G BIDI XFP
BIDI XFP transceivers are designed for bi-directional 10G serial optical data communications over singe fiber, also called WDM XFP, Bi-directional XFP, single fiber XFP