We claim the ornamental design for a portable electronic device, as shown and described.
FIG. 1 is a front perspective view of a portable electronic device showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof; and,
FIG. 9 is an enlarged view of the encircled portion shown in FIG. 4.
The short dash-dash broken lines in the figures represent unclaimed portions of the portable electronic device and form no part of the claimed design.
In FIGS. 4 and 9, the dot-dash broken lines encircling portions of the claimed design for illustrating the enlargement form no part of the claimed design.