An apparatus and method of controlling optical loss in an optical switch to equalize
optical power or loss in a group of optical signals in an optical transmission
system relatively insensitive to mechanical vibration. In one embodiment a group
of optical signals is input into an optical switch and selected optical signals
are variably attenuated using synchronized control to two mirrors in order to provide
more uniform power distribution among the group of optical signals without enhancing
vibration sensitivity of the optical switch.
