The ornamental design for an opticalfiberadaptor, as shown and described.
FIG. 1 is a perspective view of an optical fiber adaptor in accordance with a preferred embodiment of our new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is yet another perspective view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a front elevational view thereof;
FIG. 7 is a rear elevational view thereof;
FIG. 8 is a top plan view thereof; and,
FIG. 9 is a bottom plan view thereof.
The broken lines in the drawing views are included to show environment and are for illustrative purposes only; the broken lines form no part of the claimed design.