FIG. 1 is a perspective view of an optical add-drop multiplexer showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a right side view thereof, a left side view thereof being a mirror image; and,
FIG. 6 is a rear elevation view thereof.