Optical fiber device with spatially selectable output

An optical switch, comprising:

• an optical termination element having a tubular body with and axis, an open, and a closed end and having an axially-symmetric internal surface with a diameter varying along the axis,
• an optical fiber passing into a hollow of the tubular through the open end disposed along the axis, an output facet of the optical fiber being repositionably movable within the hollow between a proximal axial position and a distal axial position while remaining secured therein such as to prevent the output facet from being removed from the open end and reaching said axially-symmetric internal surface,
• the optical switch configured:
• (20A) when the output facet is in the distal axial position, to form an axially-directed beam of light by focusing light propagating through the optical fiber at a first location within the hollow and transmitting said light through the closed end;
• and
• (20B) when the output facet is in the proximal axial position, to form light output containing a majority of said light propagating through the optical fiber and directed transversely with respect to the axis by focusing said light at a second location within the hollow and totally-internally reflecting the majority of said light at the axially-symmetric internal surface.