Ultrafast　optical　switch　based　on　plasmonic　nanostructures　has　large　application　potentials　in　optical　logic　circuits　and　optical　communication　systems.　Integration　of　plasmonic　optical　switching　devices　with　optical　fibers　is　a　breakthrough　for　realizing　practical　applications　in　long-range　optical　data　transmission　or　communication　techniques.　Here,　the　incorporation　of　plasmonic　optical　switch　devices　onto　the　end　facets　of　optical　fibers　is　reported,　so　that　the　switched　optical　signals　are　generated　by　interaction　between　femtosecond　laser　pulses　and　plasmonic　nanostructures　on　one　end　of　the　fiber,　and　are　delivered　via　the　fiber　waveguide　to　the　other　end　for　detection　or　decoding.　＂Quenching＂　of　localized　surface　plasmon　in　the　gold　nanowires　by　its　interaction　with　band-edge　modulation　in　gold　through　strong　optical　excitation　is　the　responsible　photophysics.　This　work　accomplishes　for　the　first　time　the　implementation　of　ultrafast　plasmonic　optical　switch　device　on　optical　fiber　tips　for　logic　data　transmission.